February 2, 2026
Do I Need a TM44 Inspection? (UK Compliance Guide for Building Owners & Landlords)
October 23, 2025
Do You Really Need a TM44 Inspection?
If you own or manage a commercial property in the UK with air conditioning, you’ve probably heard of a TM44 inspection but do you actually need one?
The short answer: if your combined system capacity exceeds 12 kW, then yes, you legally do.
In this comprehensive 2025 guide, we’ll break down who needs a TM44 inspection, why it’s required, what happens during it, and how you can stay compliant and avoid £800 fines while improving your energy efficiency.
What Is a TM44 Inspection?
A TM44 inspection is an energy efficiency assessment of your building’s air-conditioning systems, required under the Energy Performance of Buildings (England and Wales) Regulations.
The term “TM44” refers to CIBSE’s (Chartered Institution of Building Services Engineers) Technical Memorandum 44, which provides the official guidance for assessing AC system efficiency and compliance.
In simple terms, TM44 inspections ensure your air-conditioning:
- Is energy efficient
- Properly maintained
- Suitable for your building’s cooling demand
- Not wasting electricity unnecessarily
After the inspection, you receive a TM44 report and certificate, valid for five years.
👉 Learn more about our service: TM44 Inspections in London
Who Needs a TM44 Inspection?
If your building’s total cooling capacity is over 12 kilowatts (kW), you’re legally required to have a TM44 inspection every five years, regardless of the building size, type, or usage.
This includes:
- Office buildings
- Retail shops and showrooms
- Restaurants and hotels
- Schools, universities, and colleges
- Healthcare facilities
- Residential blocks with shared systems
- Industrial and logistics buildings
Even small businesses can cross the 12 kW threshold without realising it. For example, four 3.5 kW wall-mounted split units equal 14 kW combined, triggering the legal requirement.
Need help checking your system size? Get a Free Capacity Check
What Does the Law Say About TM44 Inspections?
The Energy Performance of Buildings Regulations 2012 (amended 2023) require all qualifying buildings to hold a valid TM44 inspection report.
Key TM44 legal points:
- Applies to all non-domestic air-conditioning systems >12 kW
- Must be renewed every 5 years
- Fines for non-compliance: £300–£800 per building
- Enforced by Trading Standards and local authorities
- Inspections must be carried out by Level 3 or Level 4 accredited assessors
The 2025 update increases enforcement visibility and penalties, as the UK government pushes for higher energy efficiency across the built environment.
If your TM44 certificate expired before 2020, your building is already non-compliant.
Read more: TM44 Fines UK 2025
How to Check If You Need a TM44 Inspection
You can determine your eligibility in just a few minutes.
Quick TM44 Self-Check:
- Locate the rating label on each indoor and outdoor AC unit.
- Look for the cooling capacity (kW) number.
- Add up the capacity of all connected systems.
- If the total >12 kW, you legally need a TM44 inspection.
If your system is part of a multi-unit setup, you’ll need to count every connected component rooftop units, ducted splits, and VRF/VRV systems, all count together.
You can also ask your service contractor for the total load, or contact us for a free remote check: Free TM44 Assessment Request
What Happens During a TM44 Inspection?
A TM44 inspection is more than just ticking a box it’s a detailed energy assessment.
Here’s what a qualified CIBSE-accredited TM44 assessor will do during your visit:
- Examine the air-conditioning layout and condition
- Assess maintenance history and service logs
- Review control settings, timers, and thermostats
- Evaluate refrigerant type and leak prevention
- Identify inefficiencies and potential energy savings
- Check if the system capacity matches the building cooling demand
Once complete, you’ll receive:
- A TM44 report detailing findings and recommendations
- A TM44 certificate lodged on the Government Register
💡 You can view your existing certificate on the TM44 Public Register via GOV.UK.
Why TM44 Inspections Matter (Beyond Compliance)
While many building owners see TM44 inspections as a legal requirement, the real value lies in energy savings and system performance.
Typical inspection results identify opportunities for:
- 10–40% lower cooling costs through better controls and maintenance
- Improved occupant comfort and consistent temperature control
- Extended equipment lifespan
- Reduced carbon footprint and ESG reporting value
At TM44.uk, our engineers go beyond compliance we help businesses optimise their cooling systems for long-term savings.
Learn more: Energy Efficiency Upgrade Report
What Happens If You Don’t Have a TM44 Certificate?
Operating without a valid TM44 inspection can lead to serious consequences.
⚠️ Penalties:
- £300 fine for missing certificate
- £500–£800 fine for non-compliance
- Continuous daily fines until compliance achieved
- Public disclosure of non-compliance (in future updates)
In some cases, landlords have had insurance and tenancy renewals delayed because of missing TM44 certificates.
A quick inspection avoids all that.
Read more: TM44 Fines Explained
TM44 Inspections in London and Nationwide
London remains the UK’s largest TM44 market, accounting for over 50% of all qualifying air-conditioned buildings.
We provide coverage across:
City of London, Canary Wharf, Kensington, Westminster, South Bank, Shoreditch, Notting Hill, and beyond.
We also inspect properties across Manchester, Birmingham, Glasgow, and Leeds through our nationwide network.
Learn more: TM44 Inspections Services London
TM44 for Landlords and Managing Agents
Landlords and property managers often oversee multiple sites each requiring compliance tracking.
Our Portfolio TM44 Management service helps you manage all inspections, reports, and renewals in one place.
We handle scheduling, documentation, and reminders for your next inspection date.
Learn more: Portfolio TM44 Management
Combined TM44 + EPC + MEES Compliance
Many building owners now combine TM44 inspections with other legal energy reports:
- EPC (Energy Performance Certificate)
- MEES (Minimum Energy Efficiency Standards)
- F-Gas leak checks
Combining them saves time, reduces costs, and ensures your property meets every 2025 compliance requirement.
How TM44.uk Makes Compliance Effortless
When you book with TM44.uk, you get:
- Fully accredited Level 4 assessors
- UK-wide coverage
- Transparent pricing — no hidden fees
- Fast turnaround (certificates within 48–72 hours)
- Digital reports for easy record-keeping
We simplify compliance so you can focus on running your business.
The TM44 inspection isn’t just a legal tick-box, it’s a smart move for building owners who want efficiency, compliance, and peace of mind.
If your air-conditioning system exceeds 12 kW, don’t wait for a fine or enforcement notice.
✔️ Confirm your capacity
✔️ Book your inspection
✔️ Stay compliant and energy-efficient
💬Frequently Asked Questions About TM44 Inspections
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1️⃣ Who Legally Needs a TM44 Inspection in the UK?
Any commercial or non-domestic building with air-conditioning systems totalling over 12 kW of cooling capacity requires a TM44 inspection under the UK Energy Performance of Buildings Regulations.
This includes offices, retail shops, hotels, schools, and residential blocks with shared AC systems. -
2️⃣ What Is the 12 kW TM44 Rule and How Do I Check My System?
The 12 kW rule refers to the combined cooling capacity of all your AC units.
If the total exceeds 12 kW, you legally need an inspection. You can check the capacity on the rating plates of each indoor or outdoor unit, or request a free check from a TM44 assessor. -
3️⃣ How Often Do I Need a TM44 Inspection?
TM44 inspections must be renewed every five years from the date of your last certificate.
If your current certificate was issued before 2020, it’s now expired and your building is non-compliant. -
4️⃣ What Happens If I Don’t Have a TM44 Certificate?
Non-compliance can result in fines up to £800 per building, plus additional penalties for not providing a valid report when requested.
Trading Standards and local authorities have the power to enforce and audit compliance. -
5️⃣ Who Is Qualified to Carry Out a TM44 Inspection?
Only Level 3 or Level 4 accredited energy assessors registered with CIBSE, Elmhurst, or Stroma can legally perform and lodge TM44 inspections in the UK.
Using unqualified contractors may invalidate your report. -
6️⃣ How Long Does a TM44 Inspection Take?
Most small and medium-sized buildings take 1–3 hours to inspect, depending on system size and accessibility.
Reports and certificates are typically issued within 2–5 working days. -
7️⃣ How Much Does a TM44 Inspection Cost in 2025?
Prices vary based on building size and number of systems, but most range between £250–£650 for standard sites.
You can request an exact price using our Instant TM44 Quote Form. -
8️⃣ Can TM44 Inspections Help Reduce My Energy Bills?
Yes. TM44 inspections often identify control faults, inefficient operation, or oversized systems.
Implementing recommendations can reduce cooling energy costs by 10–40% while extending system lifespan. -
9️⃣ Do Landlords and Property Managers Need Separate TM44 Reports?
Each building requires its own TM44 report and certificate.
Landlords with multiple properties can use Portfolio TM44 Management to keep all sites compliant under one plan. -
🔟 Can I Combine My TM44 with Other Compliance Checks?
Absolutely. TM44 inspections are often combined with EPCs (Energy Performance Certificates) and MEES (Minimum Energy Efficiency Standards) assessments.
Bundling services saves time, money, and ensures full energy compliance.
✨ “Behind every inspection, there’s a bigger mission to build a future where every building in the UK runs cleaner, costs less to operate, and contributes to a more sustainable planet for the generations who’ll inherit it.” ✨
