TM44 · Statutory inspection

TM44 inspections, lodged on the national register in ten working days.

Every non-domestic building with combined installed AC above 12 kW needs a TM44 report every five years. AccuTemp is TM44-accredited and lodges reports UK-wide.

In short

TM44 is the statutory air conditioning energy inspection required for any UK non-domestic building with combined cooling capacity over 12 kW. Reports must be lodged every 5 years. AccuTemp's fixed-price TM44 starts at £450 + VAT and lands on the national register within ten working days.

Who needs one

The 12 kW trigger, and the £300 penalty.

  • Any non-domestic building > 12 kW

    The trigger is combined nominal cooling capacity, not floor area. Once installed AC across the building totals 12 kW or more, TM44 applies — whether the units are split, VRV/VRF, chiller-based or a mix.

  • Every 5 years, without exception

    Inspections must be lodged on the national register at least every five years. Missing the deadline is a criminal offence carrying a fixed £300 penalty per building, per report — and the clock does not reset.

  • Owner or operator obligation

    The duty sits with whoever controls the AC — usually the freeholder or FM on multi-let sites, but the operator on single-let. Landlords increasingly assign it to tenants at lease grant.

What you get

Deliverables in every AccuTemp TM44 report.

  • —Full asset register with photographs and locations
  • —Refrigerant type, GWP and F-Gas cross-reference
  • —SEER / SCOP performance benchmark against current best-in-class
  • —Prioritised energy-saving recommendations with payback
  • —Lodgement on the national TM44 register (report reference issued)
  • —Client-ready PDF suitable for landlord, funder and ESG audit

Related: F-Gas compliance, cost guide, server room cooling, office installation, HVAC glossary.

TM44 FAQs

Every question we get on the 12 kW trigger, price and penalty.

What is a TM44 inspection?
TM44 is the CIBSE-authored, government-mandated air conditioning energy inspection required for every non-domestic building in England, Wales and Northern Ireland with combined installed cooling capacity above 12 kW. Reports must be lodged on the national register at least every five years by an accredited assessor.
How much does a TM44 inspection cost?
TM44 pricing depends on total installed cooling capacity and the number of separate systems on site, not floor area. Most single-site inspections fall between £450 and £1,800 + VAT. AccuTemp quotes after a five-minute asset scoping call.
What is the penalty for not having a TM44?
The fixed penalty for failing to hold a valid, lodged TM44 report is £300 per building per report, enforced by trading standards. Failure to produce the report on request carries a further £200 penalty. Both are recoverable during due-diligence at sale, refinance or lease surrender.
How long does a TM44 inspection take?
On-site work for a typical office or retail site is a half to full day. Larger multi-plant sites, hospitality and industrial estates run 1–3 days. AccuTemp lodges the report and issues the client PDF within ten working days of the site visit.
Who can carry out a TM44 inspection?
Only assessors accredited by an approved scheme (CIBSE Certification, ELMHURST, Stroma or Quidos) can lodge a TM44 report. AccuTemp is TM44-accredited and lodges reports directly on the national register.
Do I need TM44 if all my AC is under 12 kW?
No. TM44 only applies once combined effective rated output across the building reaches 12 kW. A single 5 kW split serving one meeting room is below the trigger; three 5 kW splits in the same building are above it.
Book your TM44

Fixed price, lodged on the register, no exposure.

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