Temporary Works Solutions
Delivering intelligent, integrated solutions from design to completion
About Ayesa
717m+ Revenues 80+ Multidisciplines
World Rankings
#45
Top 225 International Engineering Design Firms (World) 1
#61 Global 150 Design Firms 1
#8 Top 10 By Region (Latin America) 1
#10 Top 50 Geotechnical Consultants (UK) 2
#16 Top 20 Global Water Supply 3
#26 Top 30 Sewer and Solid Waste3
#24 Top 30 Transportation 3
#35 Top 40 Industrial Process3
#35 Top 40 Oil & Gas3
#74 WA100, World Architects Survey BD Online 2024
#2 IT Consulting Firms (Spain) 4 Financial Times Top Employers in Europe
1 ENR Rating: Top 225 International Engineering Design Firms 2023 (according to revenue)
2 Geplus.co.uk Ground Engineering Magazine’s top 50 UK Geotechnical Consultants (according to UK revenue)
3 ENR Global Sourcebook 2023
4 Eraneos & Whitelane report 2023
Ranked #1 by 285 clients in Spain according to Eraneos & Whitelane report
A global leader in technology and engineering services
Over the past six decades, Ayesa has delivered iconic, large-scale projects across the globe while adhering to its core principles of people centricity, leaving lasting positive impacts, and commitment to end-to-end lifetime partnerships. Today, the company is a global provider of technology and engineering services, with expertise in over 70 disciplines and an active presence in more than 40 countries.
Ayesa’s strategic expansion across various sectors and international geographic regions has significantly contributed to its growth, earning it a place in the world’s top 50 international engineering design firms, where it is ranked top 24 for global transportation, top 20 for global water supply, and a top 5 IT service provider in Spain.
Ayesa employs over 14,000 professionals who engage in cross-disciplinary collaboration, leveraging their collective experience, insights, and best practices.
Our people are committed to developing infrastructure solutions that pave the way for a more sustainable, energyefficient, and digitally advanced world.
We deliver performance and value for clients, stakeholders, employees, and communities.
Multidisciplinary Engineering Consultants
Water & Environment
Marine & Coastal
// Environment and Sustainability
// Flooding and Rivers
// Waste Management
// Dams, Reservoirs and Major Water Infrastructure
// Drainage, Groundwater and Irrigation
// Water Conveyance and Distribution
// Water Resource Management
// Water Treatment and Desalination
// Ports & Harbours
// Marine Structures
// Coastal Modelling & Engineering
// Marinas & Waterfronts
// Subsea Pipelines
Buildings & Cities
// Arts and Culture
// Education
// Healthcare and Research
// Heritage and Conservation
// Office and Commercial
// Residential and Hotels
// Sports and Leisure
// Technology and Data Centres
// Urban Planning and Landscaping
Energy
// Liquefied Natural Gas (LNG)
// Pipelines
// Production Facilities
// Refining Facilities
// Storage and Terminals
Transportation
// Solar Energy
// Onshore and Offshore Wind Power
// Biomass
// Hydroelectric Power
// Hydrogen and Renewables Gases
// Energy Storage
// Thermal Generation
// HV Transmission and Distribution
Industry
View Sector
// Airports
// Bridges and Structures
// Highways and Roads
// HSL, Railways
// Land Management
// Metros, LRT and Tramways
// Stations and Terminals
// Transportation Systems
// Tunnels and Underground Spaces
Services
// Logistics Plants and Distribution Centres
// Metallurgical and Transformation Plants
// Agri-Food Plants
// Mining Facilities
// Chemical and Petrochemical Plants
// Yeast and Life Sciences
// Planning and Consulting
// Investigation, Assessment and Modelling
// Engineering Design and Architecture
// Construction and Project Management
Consultancy
// Digital Engineering and Engineering 4.0
// Environment, Climate and Sustainability
Working with us
Bridging the Gap
We excel in project management and supervising construction phases across the entire project lifecycle. We help clients “bridge the gap” across all relevant stakeholders, supported by our holistic understanding of needs, constraints, opportunities, and objectives.
Local Relationships & Networks
Getting a project off to the right start and mitigating any delays helps keep costs down. Our team has forged close working relationships with environmental authorities and regulators throughout the regions we operate in, enabling us to expeditiously progress projects through permitting, construction, verification, and site closure.
Innovation, Sustainability
We offer innovation with a deep understanding of environmental issues such as climate change and sustainability, waste to energy, and renewables to deliver maximum value to clients.
Proven Track Record & Trust
We have extensive experience across a wide range of sectors. We currently sit on several frameworks, such as Irish Water, Port of Cork, Oil and Pipeline Agency, Waterways Ireland, Gas Networks Ireland, Irish Rail, Fusion 21, and Translink.
Client Partnership
Our culture focuses on building solid relationships with clients who continue to select us for the significant benefits we provide. We work with public and private sectors, from large companies and national regulatory bodies to smaller organisations. Our priority is always technical excellence, partnership and lasting impacts.
Technical Excellence
We help keep our clients informed on new regulations and engage with stakeholders to move projects forward profitably and align with environmental goals. Our proactive approach helps clients benefit from our expertise in a constantly changing regulatory environment.
Safety First
We advance safety, applying rigorous processes that manage technical, environmental and social risks and hold ISO 45001:2018 – the internationally recognised standard for occupational health and safety management systems.
Multi-Disciplinary
We provide engineering and design consultancy services across multiple sectors: marine and coastal, geoscience, buildings, transportation, energy, environment, water, flooding, waste management, and conservation.
Lasting Positive Impacts
We offer the highest design standards, project management, and stakeholder collaboration to achieve optimum project solutions. Our engineering consultants are among the very best in their fields. Continuous involvement in challenging projects maintains and enhances our high standards of technical excellence.
An End-to-End Partner
We aim to build strong relationships with our clients and provide them with exceptional care. We strive to assist our clients in achieving their desired results, delivering value and positive impacts. Our agile and responsive global teams create a collaborative framework across stakeholders for project success, combining local knowledge and experience with international best practices.
People-Centric
At Ayesa, we prioritise our staff’s development to ensure a positive, enriching, safe, and empowering work experience. We are committed to fostering equality, diversity, and inclusion in our workplaces to create an environment where everyone can thrive. We invest significantly in training and development to keep our staff at the forefront of their industry. As a leading engineering consultant, we aim to positively impact the Sustainable Development Goals (SDGs) most relevant to us, such as reducing CO2 emissions, promoting water conservation, creating social value, enhancing health and wellbeing, engaging with communities, providing apprenticeships, and maintaining a safe working environment.
Temporary Works Consulting
At Ayesa, we believe one of the greatest risks in construction lies in partially erected or partially demolished structures. That’s why we apply rigorous engineering, coordination, and quality assurance to ensure temporary safety and stability across a wide range of sectors and structural conditions.
Intelligent Temporary Works across all types of projects for tier one contractors, public and private clients, and developers We provide bespoke and standardised temporary works designs for earthworkss such as deep excavations, tunnelling, structural propping, crane platforms, working access, and construction staging.
From Rail to Road and Land and Sea: Our expertise spans civil infrastructure such as roads, highways, and bridges; transportation assets including rail and interchanges; complex buildings on land and at sea; and challenging environments like tunnels and deep basements.
Multidisciplinary: With multidisciplinary capabilities spanning civil, geotechnical, marine, and structural engineering, we collaborate with contractors, developers, and public sector clients to de-risk construction, streamline buildability, and deliver cost and programme certainty.
Deep Excavation & Tunnelling
Deep Excavation:
• Shaft support systems
• Basement excavations
• Retaining structures
• Slope stabilisation
• Launch/reception shafts
• Tunnel access and support
• Dewatering
• Temporary lining systems
Tunnelling & Underground Works:
• Utilities & drainage interfaces
• Temporary utility diversions
• Deep drainage and culvert crossings
• Service protection strategies
Temporary works aren’t just a necessity — they’re an opportunity. With intelligent design, we help clients gain a competitive advantage and deliver value, by improving constructability, sequencing, and safety.
Temporary Works at a glance
Transportation & Highways
• Temporary bridge supports and bearing arrangements
• Road and junction staging for phased construction
• Traffic management, diversions, and temporary haul roads
• Embankment phasing and ground stability solutions
• Cut-and-fill sequencing and slope reinforcement
• Cofferdams, retaining walls, and crane platforms for underpasses and interchanges
• River and highway crossing structures to maintain live routes
• Access platforms and working areas for plant and machinery
• Staged construction solutions to maintain live operations
• Temporary works for constrained urban spaces and tunnelling
Temporary Works Compliance
• Full compliance with CDM 2015, including Principal Designer support
• ISO-certified QHSE systems (ISO 9001, 14001, 45001)
• Temporary Works procedures aligned with BS 5975, including: Category 1, 2, and 3 (CAT III) independent checking
• Appointment of TWD, TWC, and TWS roles as required
• BIM Level 2 integration and clash detection
• Design risk assessments and elimination/reduction strategies
• Environmental management planning and monitoring
• In-house governance by our Quality, Health, Safety & Environment (QHSE) team
• Construction phase planning and interface coordination with Permanent Works
Buildings & Civil Infrastructure
• Façade retention
• Structural propping
• Crane and piling platforms
• Formwork and falsework systems
• Marine & Coastal Infrastructure:
• Temporary jetties and cofferdams,
• Marine platform access,
• Edge protection
• Plant staging
Ayesa provided temporary and permanent works design for the Wilton tunnel portal — the northern entry to a 38 km polyhalite transport tunnel in North Yorkshire. Our scope included retaining walls, tension piles, propping, capping beams, drainage systems, and ground anchors. When dry ground conditions were confirmed, we revised the design to use contiguous piles, eliminating primary piles — saving time, reducing materials, and accelerating the programme in close coordination with the contractor.
North Yorkshire Polyhalite Project – Wilton Portal (UK), Client: Sirius Minerals | Value: £2.5 billion
Why Ayesa?
• Multidisciplinary Expertise
We combine civil, structural, geotechnical, and marine engineering to deliver fully coordinated, safety-led designs — all under one consulting firm
• Buildability and Sequencing Insight
Our team understands construction from the ground up. We design practical, buildable solutions that simplify logistics and improve programme delivery.
• Smart Interfacing with Permanent Works
As permanent works designers too, we anticipate clashes, reduce rework, and streamline handovers between temporary and permanent systems
• Value Engineering
We regularly identify smarter, leaner design alternatives — helping contractors reduce cost, risk, and time on site without compromising safety.
• Health and Safety is embedded into every stage of our engineering service provision
We operate a certified ISO 45001 Occupational Health & Safety Management System, and our teams follow rigorous internal governance protocols to ensure the highest safety standards are consistently met across all projects in the UK. We fully align with the Construction (Design and Management) Regulations 2015 (CDM 2015) and regularly support clients in fulfilling their legal duties under the regulations, including taking on the role of Principal Designer. In temporary works, where site safety and structural stability are especially critical, our designs prioritise safe buildability, sequencing, and coordination with all duty holders.
• Proven Track Record across Tier ones and major projects
Ranked #11 in the Geoplus.co.uk Top 50 Geotechnical Consultants, we’ve delivered successful temporary works on major projects like the M3/M4 Smart Motorways, A9 Dualling, A465 Heads of the Valleys, and N5 Turlough and major civil infra structure in the UK and Ireland including Stepney Crossrail and the Silvertown Tunnel.
A top 15 UK Geotechnical Consultant by revenue (GE:100 2024)
Transportation
Temporary works are fundamental to the successful delivery of transportation infrastructure. From bridge construction and motorway upgrades to rail interfaces and complex junctions, temporary works provide the structural stability and access required to safely build permanent assets — often in live, high-risk environments.
At Ayesa, we bring specialist expertise in designing and coordinating temporary works. Our team supports Tier 1 contractors, joint ventures, and transport authorities across the UK and Ireland with safe, pragmatic, and buildable solutions tailored to each site’s constraints and programme.
Our role typically begins early — identifying risks and requirements, coordinating with permanent works designers, and optimising sequencing. Through intelligent temporary works design, we help reduce disruption, shorten construction timescales, and deliver significant value on complex infrastructure schemes.
Key Capabilities:
• Temporary structural support for bridge beams, decks, abutments, and retaining walls
• Complex embankment staging and cut/fill sequencing
• Falsework and formwork for highway structures and parapets
• Temporary river or road crossings and haul routes
• Traffic diversions and live carriageway support
• Crane and piling platforms for constrained sites
• Dewatering strategies for cuttings and underpasses
• Utility protection and diversions during phased works
• Smart motorway construction staging and interface management
• Full CDM 2015 alignment and support for Principal Designer role
Utility Diversions
Ayesa provides temporary works solutions to safely manage utility diversions during infrastructure construction. Our designs support the protection, relocation, or over-pumping of live services — including water, gas, electricity, telecoms, and drainage — while enabling excavations, road realignments, and structural works to proceed. We design trench supports, temporary bridges, haul road crossings, and protection measures to ensure service continuity, minimise disruption, and meet safety and regulatory requirements. Our expertise ensures utility diversions are well-integrated into the overall construction sequence and delivered with minimal risk to programme.
A465 Heads of the Valley | Costain
Safety is critical and TW must experience and foresight.
As part of the upgrade to the A465 Heads of the Valleys appointed by Costain to design temporary works that steep, hilly terrain. Our team designed soil nails and temporary beneath the existing road, ensuring safety during construction.
To safeguard road serviceability, Ayesa assessed slope monitoring strategy — allowing real-time checks to confirm designed.
must be engineered with precision,
slope movements and defined a tailored confirm the
N5 Westport to Turlough - TW Designs, Ireland
M7 Widening & Sallins Bypass, Ireland
A6 Dualling - Randalstown to Castledawson N. Ireland
Valleys route in South Wales, Ayesa was would enable safe road widening through temporary netting to stabilise cut slopes construction.
system was performing as
Delivering Smarter Temporary Works Across National Road and Highway Schemes
Ayesa has delivered temporary works designs across a wide range of major highway and road schemes, including the A9 Dualling Kincraig to Dalraddy, M7 Widening & Sallins Bypass, N5 Westport to Turlough, N4 Collooney to Castlebaldwin, A465 Heads of the Valleys, A690 Durham, and A1 Craighall, as well as supporting key smart motorway and improvement projects such as the M3 & M4 SMART Motorways, M8/M73/M74 Improvements, and M74 Junction 5 Raith.
• Adaptable designs that respond to real-time site conditions
• Accelerated programme through practical, buildable temporary works
• Reduced construction costs via valueengineered solutions
• Improved on-site safety with compliant access and protection systems
• Streamlined delivery with integrated geotechnical, structural, and traffic designs
• Minimised disruption through effective staging and temporary traffic layouts
• Optimised construction sequencing through early engagement and coordination
• Single-source support for a wide range of temporary works requirements
As part of the upgrade to the A465 Heads of the Valleys appointed by Costain to design temporary works that would steep, hilly terrain. Our team designed soil nails and temporary beneath the existing road, ensuring safety during construction.
Ayesa
A690 Landslip - Kepier Lane Durham | BAM
M8_M73_M74 Improvement scheme Part 2, M74 junction Raith
N5 Westport to Turlough, Ireland
N5 Ballaghaderreen to Scramoge Road
M8, M73 & M74 Motorway Improvement SchemePart 3 Mainline Works
Valleys route in South Wales, Ayesa was would enable safe road widening through temporary netting to stabilise cut slopes construction. movements and defined a tailored confirm the system was performing as
A1 Craighall, Scotland | John Paul Construction
M62 Bridge, Rochdale | Network Rail
M8 Baillieston to Newhouse Improvements
Deep Excavation, Basements & Tunnelling
Deep excavations present some of the most technically complex and risk-sensitive challenges in construction — particularly in urban, constrained, or geologically variable environments. At Ayesa, we provide robust and engineered temporary works solutions to enable deep basements, shafts, underpasses, and drainage works to proceed safely and efficiently. Our engineers have extensive experience designing temporary retention systems for deep excavations in both soil and rock. Each excavation is unique — shaped by depth, ground conditions, adjacent structures, site access, and tolerable movements. We adopt an integrated geotechnical and structural approach, using advanced soil-structure interaction modelling to assess and mitigate risks, protect surrounding assets, and optimise construction staging.
Experience Includes:
• Excavation support for rail and metro shafts
• Temporary works for underground stations and basements
• Diaphragm walls, secant, sheet, and king post systems
• Slope stabilisation and temporary faces
• Impact assessment and real-time monitoring
• Temporary retaining wall design
• Shaft and tunnel access support
• Basement excavation staging
• Groundwater control and dewatering
• Soil nails, anchors, struts and propping
• Structural impact assessment and instrumentation planning
• Geotechnical modelling (PLAXIS, FLAC, MIDAS)
C305” C305”
Crossrail Stepney Green | Dragados-Sisk JV
Crossrail Eastern Running Tunnels temporary supports for Cross Passages
Deephams Shaft | Murphy Group
Buildings & Civil Infrastructure
Temporary works are an essential part of the construction process, undertaken before permanent construction can begin. The efficient design and integration of temporary works solutions have the potential to deliver substantial cost and programme savings for large building projects.
• Ayesa engineers work closely with building contractors to understand their preferred construction techniques and to develop temporary works solutions that fit hand-in-hand with these methodologies. We regularly suggest and design alternative permanent works that, when integrated with smart temporary works, streamline the overall construction project.
• As well as temporary structural support, Ayesa is experienced in providing earthworks support, crane and piling platforms, working platforms, temporary traffic diversions, utility diversions, environmental plans, dewatering or other bespoke requirements.
• With our specialist skills in geotechnics, structural and civil engineering, our consultants can manage the entire building construction process from bespoke temporary works to permanent works supervision.
• We combine our seasoned construction experience with rigorous design processes to prioritise safety.
• Our temporary works designs can often provide a competitive advantage for our clients by developing intelligent solutions.
22 Bishopsgate: Originally conceived as The Pinnacle, construction of this London skyscraper halted in 2012, leaving a partially built basement and core. When the scheme was later revived and redesigned as 22 Bishopsgate, a 62-storey commercial tower, Ayesa was commissioned to design the temporary core support system.
Working within the constraints of the existing structure, we developed a bespoke transfer solution using five retained steel columns to safely support the new core during construction. Our team designed and coordinated a complex grid of temporary walls between the basement and ground floor, all while demolition works were ongoing.
Outcome: Our solution enabled the new core construction to begin six months earlier, accelerating the programme and generating significant value for the project team.
Lee Road Water Treatment Plant Cork, Irish Water
Royal Mint Gardens, Temporary Works Design
V & A Museum, London
Silvertown Tunnel, Riverlinx CJV
Ayesa played a vital role as one of the principal underground structural designers for the £2 billion Silvertown Tunnel in London, delivered by Riverlinx CJV for Transport for London
Scope & Temporary Works Responsibilities
Designed cut-and-cover tunnels, TBM launch shafts—including the award-winning “Peanut Shaft”—and transition chambers. Engineered temporary embedded walls (sheet piles, secant piles, diaphragm walls) to support excavation and launch structures
Developed bespoke shaft solutions enabling the UK’s largest tunnel boring machine (“Jill”) to be launched, rotated, and retrieved underground
