How Much Does a TM44 Inspection Cost in the UK? A TM44 inspection typically costs between £150 and £600 for a single air-conditioning unit, with larger commercial systems or multi-unit sites often ranging from £400 to £1,500+ depending on the number and type of air handling units (AHUs) on site. The final price depends on system size, number of units, building access, and location - but every TM44 inspection produces the same outcome: a valid TM44 certificate that keeps your building compliant with UK energy regulations. This guide breaks down exactly what drives that cost, when you need a TM44 certificate, and what happens if you don't have one.
What Is a TM44 Certificate? A TM44 certificate is the official record produced after an accredited assessor inspects an air-conditioning system rated 12kW or above. It's a legal requirement under the Energy Performance of Buildings Regulations, and it must be renewed every five years. The certificate
confirms the system's energy efficiency, flags any maintenance issues, and recommends improvements to reduce running costs and carbon output. Without a current TM44 certificate, building owners and operators risk penalties and complications during property transactions, since solicitors routinely request this documentation as part of due diligence.
Key Factors That Affect TM44 Inspection Cost 1. Number of air-conditioning units. Most providers price per AHU rather than a flat site fee. A single-unit office will cost far less than a retail unit or building with ten or more AHUs. 2. Total cooling capacity. Systems with higher combined output (measured in kW) generally take longer to assess, which affects the quote. 3. Building type and layout. Multi-floor offices, large retail units, or portfolios with several sites usually involve more travel time and inspection hours than a single small commercial premises. 4. Accessibility. Units in plant rooms, roof spaces, or hard-to-reach locations can add time to the visit, which may be reflected in the price. 5. Location. Site visits in remote areas sometimes carry a small additional travel charge compared to city-centre locations. 6. Bundled services. Some businesses combine a TM44 inspection with a Commercial EPC or EICR visit, which can reduce the overall cost per assessment when booked together.
Typical TM44 Inspection Cost Ranges Property Name
Approximate number Typical cost range of AHUs
Small office or shop
1–2 units
£150–£350
Medium commercial unit
3–5 units
£350–£700
Large office or retail site
6–10 units
£700–£1,200
Multi-site portfolio
10+ units
£1,200+ (quoted per site)
These figures are general guidance rather than fixed pricing - always request a written quote based on your specific property and system before booking.
Is a TM44 Inspection a Legal Requirement? Yes. Any building with a combined air-conditioning cooling capacity of 12kW or more must have a valid TM44 certificate, renewed every five years. This applies to offices, retail premises, hospitality venues, and public buildings alike. Failing to hold a valid report can result in a £300 fine, and failing to produce documentation on request can add a further £200 penalty. Regulatory enforcement has also been tightening in recent years, with proposals for stricter monitoring and central reporting registers.
What Happens During the Inspection? A qualified assessor visits the property to review: ● System condition and maintenance history - checking for wear, leaks, or poor upkeep ● Controls and operating settings - confirming the system runs efficiently for the building's actual use ● Sizing and usage patterns - assessing whether the system is correctly matched to the space ● Energy-saving opportunities - identifying practical, low-cost improvements The visit itself usually takes between 30 minutes and a few hours, depending on the number of units and building size. The TM44 certificate and full report are then issued shortly afterwards.
How to Reduce Your TM44 Inspection Cost ● Bundle assessments. Booking a TM44 inspection alongside a Commercial EPC or EICR visit can lower the combined cost.
● Renew before it lapses. Booking ahead of the five-year deadline avoids rushed, last-minute callout pricing. ● Provide clear access. Having plant rooms and roof units accessible on the day reduces time on site. ● Get an itemised quote. Ask for a breakdown per unit so you're not paying an unclear flat fee.
Final Thoughts TM44 inspection costs vary based on system size, unit count, and site access, but the investment is small compared to the risk of non-compliance fines or delayed property transactions. If you need an accurate quote or want to book a TM44 certificate assessment for your commercial property, Commercial EPC Direct provides accredited, in-house inspections with clear reporting and one point of contact from booking through to certificate delivery.
Frequently Asked Questions 1. How much does a TM44 certificate cost for a small office? For a single-unit small office, a TM44 certificate typically costs between £150 and £350, depending on accessibility and location. 2. How long is a TM44 certificate valid for? A TM44 certificate is valid for five years from the date of inspection, after which the system must be reassessed. 3. Do I need a TM44 inspection if my AC system is under 12kW? No. TM44 inspections are only a legal requirement for systems with a combined cooling output of 12kW or more. 4. What happens if I don't have a valid TM44 certificate? You could face a £300 fine for not holding a valid report, plus a further £200 if you can't produce documentation when requested. 5. Can I combine a TM44 inspection with other compliance assessments? Yes. Many providers offer combined visits for TM44, EPC, and EICR assessments, which can reduce overall costs and save time on site.