Tackling Damp and Mould: Awaab’s Law to Drive Higher Ventilation Standards in Social Housing
Secure your seat at the biggest energy assessment and retrofit event of the year.
elmhurst conference 2026National
Book now
Non Members: £150 +VAT
Members Save 15%: £127.50 +VAT
Simply log in before purchasing and your discount will automatically apply at checkout.
The industry’s largest energy assessment and retrofit conference
Thursday 12th February 2026
Coventry Building Society Arena 9:30am – 4:00pm
Join over 400 industry professionals for a day of insight, innovation and collaboration at the Elmhurst National Conference 2026. This flagship event unites leading experts, assessors and policymakers from across the UK to share knowledge and explore the future of energy efficiency and building standards.
As the industry enters a new era of reform, with EPC changes, MEES updates, HEM and the Future Homes Standard on the horizon, the conference offers a unique chance to stay informed, build connections, and play a part in shaping the direction - an experience you won’t find anywhere else!
5 hours of certified CPD
Policy updates direct from government and industry leaders
In-depth Q&A sessions with speakers
Networking with a larger mix of 400–500 professionals
More opportunities than ever to connect with leading sponsors
Dedicated Elmhurst stand - bring your questions & meet our team
Hot-fork lunch and all-day refreshments
At the time of writing, it feels as though much of the sector is in a holding pattern. While day-today activity continues at pace, the broader economy seems to be waiting, largely in anticipation of the government’s budget announcement in late November. Many key policy and regulatory decisions appear paused, and many businesses, organisations, and individuals are taking stock amid mixed messages around potential tax changes.
As many of you will know we’re still awaiting full details on several major developments, including the Future Homes Standard (SAP and HEM) and updates to MEES for non-domestic buildings.
Scotland, however, is forging ahead. The government has laid out a clear agenda through to 2026, with sweeping changes to EPCs, the national register, and regulatory frameworks, all aiming for an October 2026 launch with a new version of HEM for existing homesmore on that in our article.
There are also numerous consultations underway, and our team is busy drafting responses to ensure that practical, implementable solutions are at the heart of future
policy. Supporting our members through these changes remains our top priority.
I was delighted to see record attendance at our Wales conference and Northern Ireland is looking to be the same. Elmhurst remains the only scheme to host these events, which bring together government representatives, academia, and leading voices from across the sector, not to mention the invaluable opportunity to network with fellow professionals.
In a world where independence is more important than ever, especially in light of the recent National Audit Office (NAO) investigation into solid wall insulation and the ongoing legacy of Grenfell. Elmhurst upholds the highest standards of impartiality. We maintain a clear separation between the work completed by our members and the oversight we provide as an approved accreditation scheme, never blurring the lines. This ensures quality assurance is delivered with complete independence and integrity across every energy assessment and retrofit project.
With so much change on the horizon, it’s essential that Elmhurst remains a steadfast advocate and
support system for our professional members. 2026 is shaping up to be a pivotal year for energy assessment in buildings, with new methodologies, technologies, reforms and innovations emerging rapidly. By relying on an independent scheme that prioritises quality and professionalism, we can continue to lead the way in navigating these challenges.
Stuart Fairlie Managing Director, Elmhurst Energy
Contact us for the latest news and updates
Elmhurst Energy, 16 St Johns Business Park, Lutterworth, LE17 4HB
01455 883 250 enquiries@elmhurstenergy.co.uk www.elmhurstenergy.co.uk
ElmhurstEnergy
ElmhurstEnergy
Elmhurst-Energy-Systems-Limited
Stuart Fairlie Managing Director, Elmhurst Energy
Chris
Caroline
Jason
John
Josh
Richard
Improving Building Performance Through Better Air Conditioning Management
As temperatures and energy costs continue to rise, the efficiency and compliance of air conditioning systems in non-domestic buildings have never been more important. Yet many system owners remain unaware about their statutory obligations for air conditioning inspections (commonly referred to as TM44, Air Conditioning Inspection Reports, or ACIRs).
What do the regulations require?
Under the Energy Performance of Buildings (England & Wales) Regulations, any air conditioning system with an effective rated output over 12 kW must be inspected by an accredited energy assessor every five years. These inspections assess system efficiency, identify faults, evaluate controls, and recommend improvements.
Historically, the non-compliance fine was around £300, with an additional penalty (approx £200) for failing to supply a valid report when requested. However, recent proposals are pushing for stricter enforcement and a new fine of £800 for non-compliance. Elmhurst supports this move, emphasising that consistent enforcement, not just higher penalties, is key to improving compliance and energy performance across the sector.
The Opportunity: For Building Owners and for Assessors
For building owners, a valid ACIR isn’t just about compliance, it’s about efficiency and value. Regular inspections can identify opportunities to cut energy costs, lower carbon emissions, and avoid financial penalties. In light of potential future amendments to MEES regulations, poor air conditioning performance could have a direct effect on EPC ratings and subsequently the ability for a building to be let.
For assessors, this creates a timely opportunity to expand their expertise. Many Non-Domestic Energy Assessors (NDEAs) are now choosing to upskill and deliver air conditioning inspections alongside EPCs, helping clients stay compliant while diversifying their own income streams.
How Elmhurst are supporting the industry
Elmhurst’s approach is centred on improving the quality and consistency of air conditioning inspections across the UK and supporting the inspectors that work in this area. By providing both training and accreditation, we ensure assessors gain the
confidence, knowledge, and tools to deliver inspections that genuinely improve building performance and energy efficiency. This support continues well beyond qualification through our accreditation scheme, access to intuitive software, expert technical guidance, and continuous professional development.
The Level 4 Air Conditioning Energy Assessment training, delivered online over six days, develops practical skills and understanding of how systems operate, why they underperform, and how improvements can be identified. Once accredited, assessors benefit from Elmhurst’s software, technical guidance, insurance, and CPD, all designed to support professional standards and ongoing competence.
Scan or click the QR code to find out more about Elmhurst’s Air Conditioning Training
John
Robinson Non-Domestic Scheme Manager
Tackling Damp and Mould: Awaab’s Law to Drive Higher Ventilation Standards in Social Housing
Awaab’s Law, officially known as the Hazards in Social Housing (Prescribed Requirements) (England) Regulations 2025, came into force on Monday 27th October 2025. This crucial legislation strengthens the responsibility of social landlords to act swiftly when serious housing hazards are identified, particularly damp and mould, which can pose significant risks to residents’ health and wellbeing.
Why was Awaab’s Law created?
‘Awaab’s Law’ is named after twoyear-old Awaab Ishak, who tragically died in 2020 from a respiratory condition caused by prolonged exposure to black mould in his family’s flat. A coroner ruled that the inadequate ventilation and persistent damp conditions in the Rochdale property directly contributed to his death. Despite repeated reports, no
effective action was taken to remedy the issue, with a surveyor later describing the property as “unfit for human habitation.”
Awaab’s story brought national attention to the dangers of damp and mould in poorly maintained homes, prompting urgent government action in this area.
When did the law come in to effect?
The UK Government introduced Awaab’s Law as part of the Social Housing (Regulation) Act 2023, mandating stricter timeframes for responding to hazards. Under the new regulations, landlords must take immediate and effective action when hazards like damp, mould, or other health risks are confirmed. These rules apply to all social rented housing and took effect on 27th
October 2025, marking a major step forward in improving housing safety standards.
Damp, Mould and the Importance of Ventilation in Retrofit Projects
While ventilation requirements under PAS 2035:2023 are sometimes seen as challenging or costly, Awaab Ishak’s case clearly illustrates the life-threatening consequences of neglecting proper airflow and moisture management.
Damp and mould are not just maintenance issues, they are clear indicators of a home environment that is failing its occupants. When moisture builds up due to poor ventilation, inadequate heating, or building defects, it creates conditions where mould can thrive.
In retrofit projects, preventing these issues must be seen as a core health and safety priority. Effective ventilation design, proper insulation, and moisture control work together to maintain a safe and healthy indoor environment for residents, ensuring retrofit measures genuinely improve living conditions rather than unintentionally making them worse.
Addressing the need to effectively assess Damp and Mould risk
Although Domestic Energy Assessors are not currently qualified to carry out formal damp and mould assessments, the growing emphasis on occupant health and air quality means this area can no longer be overlooked. As Awaab’s Law highlights, identifying and mitigating damp and mould risk is essential to safeguarding residents and ensuring
that homes remain safe and fit for purpose.
A DEA (or any Assessor assessing any building) should immediately report any mould visible to the building owner (if known) or to their instructing client. All property professionals have a duty of care, however, we must be clear that DEAs (like all energy assessors) are not competent to assess and identify mould types, severity or for the conditions that could lead to the growth of mould.
However, there is clearly a growing need for competent professionals who can recognise early indicators of damp and mould, understand its relationship with ventilation performance, and refer issues appropriately.
Elmhurst Energy is actively developing training and schemes that will enable professionals to expand their skills in this area. These will help individuals:
• Understand the causes and signs of damp and mould
• Assess moisture risk in the context of ventilation and building performance
• Apply consistent methods to identify and manage potential hazards
By investing in these skills, assessors and retrofit professionals can play a vital role in preventing future health risks and improving housing quality across the UK.
Chris Ricketts Head of Consultancy
Scottish Government Sets 2026 Date for EPC Reform Implementation
The Scottish Government has officially laid the new Energy Performance of Buildings (Scotland) Regulations 2025 in the Scottish Parliament, with the regulations confirmed to come into effect on 31st October 2026, as set out in the Government’s response to the EPC Reform consultation published in January 2025.
The reforms represent the most significant shake-up of Energy Performance Certificates (EPCs) in Scotland in over a decade, aiming to provide clearer, more meaningful information for property owners and occupiers, and to better support Scotland’s journey to net zero.
What was announced in January?
At the start of the year the Scottish Government set out proposals to reform EPCs. The plan introduced a new three-metric rating system for domestic EPCs which included: Heat Retention, Heating System, and Energy Cost, replacing the single headline rating currently used. The reforms aimed to provide clearer, more meaningful information on a building’s energy performance, with EPC validity reduced from 10 years to 5 years (both domestic and non-domestic), a new certificate design, and the launch of a digital EPC platform to show how different upgrades could affect a property’s performance. Stronger quality assurance and oversight of accreditation schemes and assessors were also proposed, with initial changes for nondomestic buildings expected at a later stage.
What new updates have been released?
As of 10th October the Scottish Government has laid the legislation in Parliament, confirming the reforms will take effect on 31st October 2026. No major changes have been made to the original EPC Reform proposal/outcome released early in the year, however, Elmhurst has identified the following key updates:
1. A commitment to align the new EPC format with the
Home Report: Following stakeholder feedback, The Scottish Government has committed to ensuring the new EPC format is closely aligned with the Scottish Home Report. This aims to reduce duplication and improve the clarity of information provided to homeowners and buyers.
2. Further detail on the digital EPC interface that will support the transition: The Scottish Government has confirmed plans to introduce a digital EPC interface that will sit alongside the certificate, allowing users to explore upgrade options and see how different measures could affect ratings. A printable/PDF version of the EPC will remain available, but the preference is toward a web-based, interactive presentation of EPC data.
3. No change to proposed metrics: The proposed three-metric approach (Heat Retention Rating, Heating System Rating and Energy Cost Rating) remains unchanged. The ratings will continue to use an A–G scale, with both “current” and “potential” ratings displayed (i.e. showing impact of improvements).
4. Shift from SAP/RdSAP to the Home Energy Model (HEM) as the underlying methodology: The Scottish Government confirms that it will replace SAP/RdSAP with the UK Home Energy Model (HEM) as the
foundational methodology for new EPCs. The move to HEM is central to the reform’s objective of delivering more robust, consistent, and comparable performance metrics across the UK and improving the relevance of EPC data.
5. Transition and invalidation of EPCs issued before the 31st October 2026: As a result of the EPC metrics and design changing, and in order to ensure consistency, and reduce confusion, from 31 October 2026, only EPCs produced under the new methodology will be valid.There will be a short transition period allowing existing EPCs to be used for sales, lettings and other trigger events taking place before the go-live date, but after that point the new format must be used. Older certificates will remain accessible in the public register but will be clearly marked as historic and invalid.
6. On Site Auditing to go ahead: Once the regulations are in force, The Scottish Government plans to recruit a team of auditors and inspectors who will work alongside local government enforcement authorities to carry out onsite inspections/ audits. This auditing function will be reviewed within two years after implementation to assess resourcing, consistency and effectiveness.
Elmhurst’s Managing Director, Stuart Fairlie, is pleased to see this update from Scottish Government which signals that change is well and truly under way:
“The laying of the legislation in Parliament is a major step forward for EPC reform in Scotland. It moves this agenda from consultation into delivery, giving the industry a clear date to work towards and the certainty needed to prepare.
The commitment to modernise the methodology, refresh the design of EPCs and strengthen auditing is a positive and necessary evolution of the framework. These changes have the potential to make EPCs more accurate, consistent and trusted, which is essential if they’re to play their full role in supporting Scotland’s net zero goals.
As the focus now shifts from policy to practical implementation, we look forward to working closely with the Scottish Government and other stakeholders to make sure the transition is smooth and effective for our members and consumers alike.”
Next Steps
The Scottish Government will now focus on implementing the legislation and supporting delivery ahead of the October 2026 golive date. This includes finalising secondary technical consultations (such as lodgement fees and penalty structures), establishing the operational framework for enforcement and auditing, and working with local authorities to build capacity.
Caroline Postles
Existing Dwellings Technical Team Manager
Welsh government release consultation on Building Regulations Part L: 2025 Review
On 27th August 2025 The Welsh government launched a consultation on changes to the next versions of Part F, L and O of Buildings Regulations for both dwellings and non-domestic buildings. The consultation looks at numerous proposed changes to the compliance standards and the associated calculation methodologies, particularly looking at the introduction of the Home Energy Model for new build dwellings.
New & Existing Dwellings
Uplift to Energy Efficiency Standards – The consultation proposes that new homes be designed to achieve zero carbon emissions as the electricity grid decarbonises. Two uplift options to Part L are outlined, both assuming a heat pump and solar PV in the notional dwelling:
• Option 1: DMEV ventilation
• Option 2: MVHR ventilation – higher carbon and cost savings, but with greater build costs
The associated impact assessment shows option 2 gives a 2% higher carbon reduction than option 1 but at a 2.4% increase in build costs. The Government’s preference is option 1 which delivers a 93% carbon saving over Part L 2022 at a build cost increase of 3.3%.
Performance Metrics – Part L 2022 currently uses the Dwelling Energy Efficiency Rate (DEER) which is a minimum EPC rating of a B for new homes. The consultation proposes to replace this with Energy Use Intensity (EUI) which is the total energy consumption from regulated and non-regulated (appliances) usage and inclusive of
renewable energy generation that is used within the dwelling.
A requirement for renewable energy generation – A proposal for a functional requirement for a minimum amount of renewable energy generation on new homes was included in the consultation.
Changes to Part F – Ventilation. Of course changes to Part L specifically in the areas of airtightness, need to be reflected in Part F. The following changes are proposed:
• Clarifying that new ventilation systems installed in new and existing homes must be commissioned by a member of a competent person’s scheme or by the Building Control Body.
• Powered flow hoods must be used for commissioning new ventilation systems and rotating vane anemometers will no longer be permitted
Changes for Existing Dwellings
– For significant new extensions to existing properties (over 30 m2 total floor area) renewable energy must be installed during construction. This can be solar photovoltaic panels or solar hot water panels. In addition, two highrisk scenarios will be brought under the new Part O:
• Replacing windows in highly glazed flats
• Loft conversions with new openings
• In both cases, solar gains must be controlled through appropriate mitigation measures
Calculation Methodology - In regards to the national calculation methodology used to demonstrate
compliance with the energy efficiency standards in Part L 2025 it is proposed to use the Home Energy Model (HEM), with a ‘Wales Part L 2025’ wrapper as a replacement to the current Standard Assessment Procedure (SAP). However, the consultation does leave an opportunity for SAP to continue if HEM is not completed in time for Part L 2025. This aligns what is currently occurring in England.
To view the Part L Wales Consultation tool, click or scan the QR code
New & Existing Non-Domestic Buildings
Uplift to Energy Efficiency
Standards – Similarly to the proposed changes for new build dwellings, the consultation emphasises the importance of integrating low-carbon heating systems, such as heat pumps or renewable electric systems, directly into the building specification. The goal is to ensure that these buildings are able to adapt to the decarbonisation of the electricity grid without requiring costly retrofit work later.
Photographic Evidence – The consultation also proposes requiring photographic evidence for new non-domestic buildings. This would supplement current modelling tools and site inspections, providing a permanent record that key elements like insulation and building services are correctly installed.
Improving Energy Efficiency for existing Non-Domestic Buildings
– For existing non-domestic buildings, the consultation acknowledges the need to improve energy efficiency standards, though there are no specific proposals. The Welsh Government is seeking stakeholder input on practical measures that could be implemented to enhance performance in existing stock. This could include mandatory improvements during renovations or extensions.
Calculation Methodology - The Welsh Government’s Part L 2025 review proposes updates to the National Calculation Method (NCM), which is used to assess the energy performance of non-domestic buildings. Draft versions of the updated NCM and the consultation version of SBEM (cSBEM) are available for stakeholders to review and provide feedback.
Click or scan the QR code to view the government cSBEM tool
Timelines
The consultation closes on 17th November 2025. Following this, the Welsh Government are expecting to publish the new versions of Part F, L and O in early 2026 with the standards coming into force in the summer/autumn of 2026. However, the consultation does offer either a 6 or 12 month implementation period for consideration. Should the 12 month implementation period be chosen the new standards would not come into force until early 2027. A one year transition period would apply so for work commenced during this period can remain under the Part L 2022 standards. However, for dwellings currently benefiting from sites under older transitional arrangements a change is proposed. Known as “sunsetting older transitional arrangements,” this means that for dwellings currently covered by previous transitional provisions, any plots where construction has not yet commenced within the transition period must now comply with Part L 2025.
Elmhurst’s Perspective
Jason Hewins, New Build Dwellings Scheme Manager comments:
“Elmhurst are pleased to see the Wales Government publish this consultation on the next revision to Part F, L and O of the Building Regulations. We support the intent to revise all approved documents at the same time as they all must be considered together to prevent any unintended consequences.
It’s encouraging to see the Wales Government also state the intent to use the Home Energy Model, if ready, but also take the pragmatic step of allowing SAP to be used if HEM is not at the position to be the sole methodology used to demonstrate compliance.”
John Robinson, Non-Domestic Scheme Manager goes on to add: “Overall, the Part L 2025 review represents a significant step toward modernising energy performance standards for non-domestic buildings in Wales. By focusing on low-carbon heating, futureproofing new constructions, and exploring ways to enhance existing stock, the consultation reflects the government’s commitment to sustainability and the reduction of carbon emissions across the built environment.”
Jason Hewins
New Build Scheme Manager & John Robinson Non-Domestic Scheme Manager
The importance of broadening your competence through CPD and Upskilling
The UK’s energy efficiency sector is entering a new era. With the Future Homes and Buildings Standards changing how our homes and commercial buildings are to be built, the Home Energy Model (HEM) bringing in a new way to model domestic dwellings, through to Minimum Energy Efficiency Standards for the entire Rental sector and EPC reform, all on the horizon. Professionals across the industry need to stay ahead of these challenges and must be able to adapt to the changes by demonstrating competence within key standards and frameworks.
At Elmhurst, we believe that it is key for us to support our members and help them on their competence journey as they face these changes and challenges and that’s why we’ve launched the Great Green Upskill.
What’s Changing?
In the space of 12 months, we are likely to see five big changes;
1. EPC Reform; bringing about a new EPC with different metrics, in Scotland this also includes a reduce validity period (with big impacts) and a new register.
2. Updated regulations in the form of the Future Homes Standards and Minimum Energy Efficiency Standards – these will start to make use of these metrics
3. To support this, the Home Energy Model will be launched, initially for new build dwellings but this will also be used in a reduced format for existing dwellings
4. Decent Homes Standards
across the entire rental sector; health in buildings and damp and mould being key focus areas
5. The increased use of measured energy performance results within our methodologies to establish more accurate starting points and quantifiable improvements from retrofit.
These changes affect how we assess homes, advise clients, and deliver retrofit solutions. For Energy Assessors and Retrofit professionals, staying informed isn’t optional; it’s the difference between being reactive and being ready. As an industry, we have never stayed static, and Elmhurst members have always looked to add new products and services and to diversify their businesses in response to changing regulations and customer needs.
New skills and techniques required – the truth is out there
Our models and methodologies are about to change, at a base level, and how they are applied into regulation is going to move forward. Every Elmhurst Energy member (and to an extent, their clients) will need to understand these in advance and become skilled in how to use the updated methodologies. Advice and the ability to advise correctly will also become essential.
Plus, to enhance our methodologies, we can now measure the actual energy performance of buildings. Airtightness testing, whether using Blower Door or Pulse method, is now fully incorporated within SAP, RdSAP (since June), and SBEM. This
means that every building can have its airtightness tested and reflected in their EPC or Retrofit Energy Report and we are now able to reflect the actual performance of buildings in this aspect. The ability to be able to perform this test has never been in higher demand and the number of Air testing professionals has grown in line with this.
There is real value in competence - not only for clients, but for the industry as a whole. By truly understanding how a building performs in practice, we can make the right interventions. This ensures designs are neither oversized nor over-specified to meet requirements, and, just as importantly, not under-specified in a way that negatively impacts the consumer or occupant.
Roll that theory out to emerging technologies such as Measured HTC and In-Situ U-Value, and we can further (and better) understand our buildings still. We can also measure the actual improvement of buildings, post the installation of measures. This is a crucial step in consumer protection, guarantees and warranties, perhaps even a requirement in green lending.
Being aware of these principles is key; taking advantage of the growing market is an opportunity for all.
Appropriate knowledge at the right time
This is why Elmhurst have a logical and helpful three step process to training and competence, supporting our members through these developments.
1. Understanding and Introduction Courses – these are short introductions or taster courses, giving learners the opportunity to understand what is changing or the essentials involved in expanding their competence. They almost always offer certified CPD.
2. Elmhurst Competency Course or Formal Qualification –Where a National Occupational Standard (NOS) doesn’t exist yet, Elmhurst will often write a course that meets the needs of a new role, like we did for Retrofit Assessor. For established roles or where a NOS already exists, Elmhurst will have an Awarding Body backed qualification course. We also offer APEL for experienced practitioners, where suitable. These are required to join an Elmhurst scheme.
3. Elmhurst Competency Scheme – each of our EPBD, Retrofit or Competency Schemes are created in broadly the same way; offering industry leading software, guidance and materials, along with award winning technical support. We support our members through robust Quality Assurance process, and every member is insured for the work they produce under that scheme. Being a member of an Elmhurst scheme is part of the continuous improvement, learning journey.
The Role of CPD
Continuing Professional Development (CPD) is more than a regulatory requirement. It’s how professionals stay sharp, relevant, and respected. Whether it’s learning
about PAS 2035, understanding MEES metrics, or mastering new software, CPD helps you deliver better outcomes for your products and services, ultimately benefitting your clients.
CPD is essential and a great opportunity to improve in areas where you are not strong and also stay ahead in a changing industry. Elmhurst believe every member should write their own Personal Development Plan (PDP) each year; highlighting these opportunities and looking for courses and materials that meet that need.
The Great Green Upskill
The Great Green Upskill is Elmhurst’s pledge to provide our members with the essential skills now, and in the future, to thrive in the fast-moving energy efficiency and retrofit market – all at an exclusive, members-only price.
Available at exclusive discounted rates for Elmhurst members, courses include Airtightness and Background Ventilation Testing, Energy Efficiency in Older and Traditional Buildings, Heat Loss Assessor, and all ondemand CPD modules.
Scan or click the QR code to find out more about
The Great Green Upskill
Andrew Parkin, Technical Development Director
Demystifying the Home Energy Model
In November 2023 the Department of Energy Security and Net Zero (DESNZ) released two consultations introducing a new energy rating methodology known as the Home Energy Model (HEM). The Home Energy Model is intended to replace the existing Standard Assessment Procedure (SAP) and will be used to calculate compliance with Building Regulations such as the Future Homes Standard and produce Energy Performance Certificates.
What is the Home Energy Model?
The Home Energy Model is a complete replacement for the current Standard Assessment Procedure. It is a new methodology created using modern industry standards and is being validated against real-world performance data.
Like SAP, the Home Energy Model will underpin a large number of government policies, making it a key tool in delivering the UK’s housing and climate objectives. As described in the government consultation of the same name, it is ‘a new name for a new methodology’.
Initially developed by the Building Research Establishment (BRE), the Home Energy Model is now being taken forward and developed by Sustenic.
What are wrappers?
The Home Energy Model represents a next-generation approach to measuring home energy efficiency. However, in order to utilise the core HEM calculation engine (also called ‘full’ HEM or the Calculation Engine) for a specific purpose, a wrapper needs to be applied.
Wrappers define the purpose the Home Energy Model in a particular context. Wrappers adapt the user inputs, input assumptions and output metrics, in order for it to be used for specific tasks. Each wrapper tailors the HEM core differently depending on the intended use.
The only wrapper currently in development is for compliance with the Future Homes Standard, although further wrappers are expected, such as for the production of EPCs.
Is the Home Energy Model available to use yet?
Despite the increasing discussion surrounding HEM, there is still confusion about its status. HEM is not yet a functioning tool in real-world settings. As the Future Homes Standard has not yet been finalised, the corresponding wrapper is not available. Until then, the Home Energy Model remains in development and is not currently in use.
What is SAP 10.3?
While the Home Energy Model and the Future Homes Standard wrapper are still under development, the Government has committed to releasing the Future Homes Standard in 2025. Given this timeline, there were concerns about relying solely on the Home Energy Model for compliance.
In response, DESNZ and MHCLG announced in May 2025 that an updated version of SAP, also known as SAP 10.3, will be used to demonstrate compliance with the Future Homes Standard. This provides a smoother transition and gives the industry time to prepare for the full implementation of the Home Energy Model.
When the Home Energy Model is deemed complete and ready to take over from SAP 10.3, there will be a phased transition in order to give the industry time to recalculate existing designs in the Home Energy Model with Future Homes Standard wrapper.
Raw HEM Engine = The car engine
Why HEM isn’t Drive-Ready (Yet) – A look under the bonnet
The Rules of the Road
Just as every driver must follow the rules, like speed limits and traffic lights, our industry relies on conventions and regulations to ensure assessors consistently deliver work of the highest standard. As the industry’s leading Government-approved scheme, Elmhurst are here to guide you every step of the way through expert support and thorough auditing. We don’t just help you understand the rules, we make sure you’re applying them with confidence and consistency.
Wrappers = The Car Body and Components
One wrapper might be for Future Homes Standard
Another wrapper for EPCs
Others could emerge for different needs
= The Mechanic
You = The Driver (& Navigator)
We’re the ones in the workshop, building the vehicle around the HEM engine: You’re the one in the driver’s seat, using the car we build and navigating day-to-day challenges within the industry.
This is the Government’s highperformance engine - the core energy calculation logic. But on its own, it doesn’t move.
These are the shells that make the engine usable, such as the car’s body, steering wheel, pedals, and gearbox.
They turn raw energy and calculation into practical, tailored tools. Wrappers will be developed by Government and schemes will be able to connect to them to extract the correct data for specific tasks.
How are Elmhurst Preparing?
Using Energy Calculation as a Service (ECaaS), we connect to the right wrapper (FHS, EPCs, etc.)
Then, we build the user interface - the dashboard, buttons and controls so it’s simple to use, accurate and fully compliant
But we don’t just build it and hand it over, we maintain it, update it, and ensure it’s roadworthy every time you drive.
We work closely with government to understand every component and test rigorously, so when you start the engine, you know it will just work.
But you’re not just driving, you’re helping us shape the vehicle.
Feedback from Elmhurst members tells us what’s running smoothly, what needs a tune-up, and where the system can work better for real-world assessors, builders, and clients. You highlight the features that matter most and challenge us to make them better and more suitable for you.
Just as we’ve done with every previous update to Building Regulations, we’re already working to ensure our members and industry are fully prepared for what the Future Homes Standard will bring.
Our teams have:
• Launched HEM Theory CPD courses available to book now - Scan or click the QR code
• Planned targeted training for both SAP 10.3 and the Future Homes Standard
• Commenced development of a brand-new HEM application using the Future Homes Standard wrapper
• Worked to upgrade our Design SAP 10 software to incorporate SAP 10.3 changes –With more to come!
Jason Hewins, New Build Scheme Manager
Elmhurst
Under the Spotlight: Why Vigilance and Integrity Must Define the Future of Energy and Retrofit Professionals
The built environment sector is now under a spotlight like never before. Rising energy costs have fundamentally changed how owners and landlords think about the performance of their homes and business premises, and how much they expect from the professionals who assess and improve them.
The likes of energy certificates, airtightness testing, and retrofit assessments are no longer seen as background compliance activities; they shape how people live, how they manage their finances, and how much they trust the systems and professionals around them. Expectations have risen exponentially, and with that, so too has the exposure for everyone working in this space.
Scrutiny, Accountability and Cultural Change
This growing scrutiny is being fuelled by a wider cultural shift in housing and construction. The findings of the Grenfell Tower fire inquiry revealed how weak
oversight, poor professional standards and complacency can lead to devastating consequences. Although Grenfell centred on fire safety, it has become a touchstone for wider systemic reform across the entire built environment.
The government has been explicit: regulatory expectations will tighten, accountability will be enforced, and competence will no longer be assumed. Energy and retrofit professionals are part of this ecosystem, and they are not exempt from that spotlight.
Similarly, the introduction of Awaab’s Law represents a powerful and sobering shift in how the state now views housing safety and performance. Born from the tragic death of two-year-old Awaab Ishak due to mould exposure, the legislation sets clear legal expectations for landlords to tackle damp and mould swiftly, and it embodies a broader message: housing standards are a matter of health, dignity and human rights. Although aimed at landlords, this law
signals to the entire sector, including energy and retrofit professionals, that environmental conditions within homes are no longer issues that can be ignored, deferred or downplayed. Dampness, mould, ventilation and poor thermal performance are all interlinked with the kind of work this industry delivers every day.
A Fragile Trust in Retrofit and Energy Performance
That changing context has already been playing out in the public domain. Media scrutiny of EPCs, retrofit work and energy performance has intensified, with investigations and reports drawing attention to inconsistent assessments, questionable methodologies and gaps between reported and actual performance. These stories have a powerful impact: a single case can quickly shape national perception and prompt further scrutiny from government, consumer groups and home and building owners alike.
Meanwhile, official reviews
have provided hard evidence of systemic weaknesses. The recent report from the National Audit Office (NAO) revealed serious failings in government-funded retrofit schemes, including poor workmanship, inadequate oversight, and even instances of fraud. Tens of thousands of homes have required remediation, and some pose ongoing risks to health and safety. The message is clear: trust in retrofit, and in those who deliver it, is fragile, and once lost, it is difficult to rebuild.
Raising Standards to Lead, Not Follow
In this environment, energy assessors, retrofit coordinators and other building performance professionals must recognise that minimum compliance is no longer enough. Evidence must be thorough, accurate and defensible. Independence must be protected against any commercial pressures. Competence must be continually refreshed through meaningful professional development, not treated as a box-ticking exercise.
Every action and decision must withstand public, regulatory and legal scrutiny.
The lessons of Grenfell, the clarity of Awaab’s Law, and the increasing media and consumer attention all point in the same direction: the industry is being held to higher standards, and rightly so. Retrofit and energy assessment are not administrative tasks; they are integral to housing and building quality, occupant health, and the national net zero journey.
This is not just a moment of risk, it’s also a moment of opportunity. The growing importance of EPCs, airtightness, and retrofit, places our members at the centre of meaningful national change. By embracing vigilance, integrity and accountability, energy and retrofit professionals can not only protect themselves but also lead the sector in building a safer, warmer, more efficient housing/building stock.
The future will reward those who meet this challenge head-on. When
scrutiny intensifies, doing the right thing isn’t just good practice, it’s essential.
Elmhurst continues to engage proactively with mainstream national media such as Which?, the BBC, and The Guardian, to advocate for the vital role our sector plays in improving the energy performance of homes and buildings. Our independence is central to that advocacy; we celebrate professionalism and integrity wherever we find it, but we will also call out poor practice when it undermines trust in the industry. When the solution is right, we stand behind our members; when it is wrong, we do what we can to ensure it is put right. Elmhurst will always be here to support our members in remaining competent, compliant and confident, because together, we can lead the way in making the nation’s homes and buildings more energy efficient.
Stuart Fairlie Managing Director
Ventilation Control: Why Timing Matters as Much as Airflow
Good ventilation is essential to maintaining the health of our homes and the occupants who live in them, but getting it right is not necessarily simply a question of moving more air. Analysis of new data from Leeds Beckett University is helping to show that when and how we ventilate can be as important as the volume of air exchanged.
Learning from underfloor environments
The floor void is one of the least understood parts of the older homes, but as there are few variables, they can provide an insightful perspective on ventilation. In homes with suspended timber floors, air bricks have traditionally been used to provide a constant flow of air beneath the floor, helping to control moisture and prevent damp and timber rot. While it’s a simple and reliable approach, the fact that it has been the only way to ventilate the void
for hundreds of years doesn’t necessarily mean it’s the only method or that it always provides the best outcome. As homes are insulated and made more airtight, we are increasingly learning that new approaches to ventilation are needed to reflect the dynamics of real homes and the people in them.
New data, new evidence
A recent, independent study by Leeds Beckett University analysed data from the world’s largest dataset of underfloor conditions. The fouryear dataset captured temperature and humidity trends across hundreds of UK homes with suspended timber floors.
The findings confirmed clear seasonal patterns: humidity in the floor void is lowest in summer and highest in the colder months. The researchers observed that: “The void humidity trends appear similar to those experienced by the
external humidity.”
This strong correlation suggests that outdoor conditions play a dominant role in how moisture behaves below the floor. Yet the study also noted that internal void air does not fully mirror the external environment: “If the void air was perfectly exchanging with the external air, this value (the difference between internal and external humidity) should be around zero… this is not the case.”
This interesting finding shows that traditional, continuous ventilation is not perfect all year and does not always maintain equilibrium between indoor and outdoor conditions.
The value of timing
The Leeds Beckett analysis also found that homes with controlled, intermittent ventilation under the floor maintained slightly lower relative humidity (RH) on average
compared with those relying on permanent openings. The researchers concluded that this was likely due to ventilation being provided at the right times:
“The reduction in RH may therefore be due to the algorithm correctly choosing the best times to vent and providing more ventilation during these periods.”
This supports the broader principle that has been emerging from research for some years that ventilation should respond to environmental conditions rather than operate continuously.
Why purge ventilation works
Purge ventilation is defined by short, controlled bursts of airflow that coincide with favourable weather and has been shown to be effective in ventilating homes efficiently ;with this new data and analysis confirming this.
In simple terms, purging air at the right moment can achieve the same or better moisture control than leaving vents open all the time. When external air has high relative or absolute humidity, introducing it into the void can increase relative humidity and risk of condensation. When external conditions are warmer and drier, ventilation is far more effective at removing accumulated moisture. By limiting ventilation during adverse conditions and increasing it when drying potential is high, it reduces both humidity and unnecessary heat loss.
The Leeds Beckett study also observed that average underfloor temperatures were higher where ventilation was managed in this way. Warmer voids naturally hold less relative humidity, further contributing to healthier and more stable environments.
These findings align with measured results from other building-
performance research. When combined with good insulation, controlled ventilation supports both energy efficiency and moisture management, maintaining the balance between comfort, health and durability that retrofit programmes aim to achieve.
Considerations for retrofit practice
For retrofit coordinators and specifiers, this growing evidence base provides several practical considerations:
• Ventilation strategies should consider timing and responsiveness, not just total airflow rates.
• Continuous ventilation is not always beneficial; in some situations, it can increase humidity and is known to cause heat loss.
• Monitoring and data collection can reveal how individual properties respond to seasonal and local variations and can identify issues and risks for individual homes.
A move towards condition-led design
For an industry increasingly focused on whole-house retrofit, these insights point to the need for a more dynamic approach to ventilation. Designing systems that adapt to actual conditions can reduce energy demand, better meet the needs of homes and residents, while protecting the long-term health of the building fabric.
Ultimately, effective ventilation is about balance. It is not simply a matter of how much air is moved, but when and why. By moving from fixed-rate ventilation towards condition-led control, we can make homes that are not only energy-efficient but also resilient, comfortable and truly fit for the future.
Scan or click the QR code to find out more about AirEx
Richard Kemp-Harper, Chief Strategy Officer, AirEx Technologies
Market Data
At Elmhurst, we collect and analyse data from a range of sources to help us make informed business decisions.
Turning this data into clear, meaningful insights takes time and a deep understanding of the wider context. In each edition of Energy Matters, we share a snapshot of this data alongside concise commentary that we hope you’ll find useful and thought-provoking as you plan for the future.
Some datasets, particularly those relating to new build homes within the devolved nations, are periodically updated and may include estimates where the latest figures are not yet available.
Amo Sihra, Commercial Director
EPC Lodgements vs House Sales – Market Snapshot
The chart shows EPC lodgements (blue) and house sales (red) from 2013 to 2025.
EPC volumes peaked in 2014, declined until 2018, then recovered steadily. Since 2020, lodgements have risen and are now close to 2 million, indicating strong demand for assessments.
House sales have been more volatile: steady growth until 2016, a dip before 2020, then a sharp fall followed by a surge in 2021. Sales have since cooled and remain around 1.1 million.
Housing Market Trends: Annual Starts vs. Completions
Annual housing starts (blue) and completions (red) across England, Wales, Scotland, and Northern Ireland show notable shifts from 2011 to 2025.
• 2013–2018: Strong growth in both starts and completions, with starts leading.
• 2019 Peak: Starts exceeded 210,000 units, ahead of completions.
• 2020–2023: Volatility with a sharp drop in starts, while completions held steadier.
• Recent Uptick: After hitting a low in 2024, starts have begun to rise again, signalling renewed activity. This should support higher completion levels in the months ahead.
New Build EPC Trends Over Time
The chart shows On-Con EPCs (rolling 12 months) from 2013 to 2025:
• 2013–2019: Strong growth from ~140K to over 300K, driven by housing activity and compliance.
• 2020: Noticeable drop to ~250K.
• 2021–2022: Recovery with fluctuations, nearing previous highs.
• 2023–2025: Gradual decline to ~230K, reflecting cooling market and regulatory shifts.
Non-Domestic Property Trends
The chart tracks non-domestic EPCs Issued (blue) and Sales (red) on a rolling 12-month basis from 2013 to 2025.
• Sales have stayed steady, rising gradually to around 125,000 by late 2025.
• EPCs show more volatility, peaking near 160,000 in mid-2022 before falling back to about 110,000.
• Recent data shows sales climbing while EPC issuance declines, suggesting stronger transaction activity but fewer EPCs.
Elmhurst Insights:
• EPC demand is growing even as sales remain subdued.
• Compliance and rental market activity likely driving lodgements.
• Opportunities remain strong despite slower sales, with many EPCs linked to retrofit projects, funding schemes, and other property improvements, not just house sales.
Elmhurst Insights:
The recent recovery in starts is encouraging and points to improving supply conditions going forward.
Elmhurst Insights:
After years of growth, EPC volumes are trending downward, signalling a softer housing market.
Elmhurst Insights:
Market demand remains firm, while EPC trends reflect changing compliance or energy efficiency priorities.
Training Update
Elmhurst Energy offers diverse training options tailored to meet your needs. With over three decades of industry experience, we ensure an engaging and impactful learning experience. Our qualifications and CPD courses cater to both beginners and seasoned professionals. Here’s a breakdown:
Classroom Training
Regular sessions held in Lutterworth, with nationwide availability.
Interact with expert tutors in person.
Hands-on, practical learning approach.
Personalised guidance and networking opportunities.
Remote Training
Flexibility to learn online from anywhere with an internet connection.
Live sessions with interactive features.
Engage directly with instructors and peers via Zoom and Microsoft Teams.
On Demand Training
Access full qualification and CPD webinars anytime, anywhere.
Study at your own pace to fit your schedule.
Enjoy the convenience of learning on-the-go.
By offering these formats, we accommodate various preferences and schedules, ensuring the best learning experience for our customers.
GREAT GREEN UPSKILL THE
The Great Green Upskill initiative Elmhurst Energy is empowering members with the expertise needed to succeed in today’s fast-changing retrofit and energy efficiency landscape. With over 450 professionals already making use of our 20% and 40% discounts, the initiative is gathering real momentum — and we’re only just getting started.
Heat Loss Assessor Training
Elmhurst’s Heat Loss Assessor course teaches how to calculate heat loss in homes to correctly size heating systems like heat pumps, following BS EN12831 standards. It’s available on-demand for flexible learning. Once completed, learners can join Elmhurst’s Competency Scheme and access exclusive tools and support.
40% discount for members!
Retrofit Assessor
Elmhurst’s Retrofit Assessor course helps qualified DEAs upskill to carry out Retrofit Assessments under PAS 2035. It covers property data collection like RdSAP, floor plans, condition reports, and occupancy assessments. Retrofit Assessors provide vital information for Coordinators to create whole-house retrofit plans. The course is available on-demand and in classrooms for flexible learning.
40% discount for members!
Level 3 Energy Efficiency in Older and Traditional Buildings
As the retrofit sector increasingly focuses on older and traditional buildings, professionals need specialist knowledge to ensure energy improvements are appropriate and effective. Elmhurst’s Level 3 Award in Energy Efficiency for Older and Traditional Buildings equips Retrofit Assessors and Coordinators with the skills to assess heritage properties sensitively and in line with PAS 2035 and PAS 2038. This fully online course offers a flexible way to gain essential expertise, helping learners unlock new project opportunities and meet growing demand in this specialist area.
40% discount for members!
Elmhurst’s AI-assisted remote inspection platform
Exclusively for Retrofit Coordinators
CoAssess transforms both remote and on-site property inspections into a simple, structured process, capturing photo and video evidence, checking for missing details, and automatically generating professional, audit-ready reports. Built to support both remote and on-site inspections under PAS 2035 and TrustMark standards, CoAssess helps you work smarter, faster, and with complete confidence.
Why choose CoAssess?
Work remotely – carry out midpoint and endpoint inspections without visiting site, where PAS 2035 allows.
Cut costs and save time – reduce travel and admin through automated reporting.
Stay compliant – meet PAS 2035 and TrustMark requirements with audit-ready records. Capture quality evidence – AI-assisted checks ensure nothing is missed.
Scale your work – manage more projects efficiently, wherever you are.
£50 per use! No subscriptions or set-up fees!*