TM44 Inspection Frequency: How Often Are Inspections Required?

June 3rd, 2026

Last updated: May 22nd, 2026

TM44 inspection frequency is something that might not be at the top of your agenda when managing a building. But it could be essential, or even a legal requirement.

Many commercial buildings rely heavily on air conditioning systems to keep workplaces comfortable and productive. Buildings often use cooling systems every day throughout the year.

What many building owners do not realise is that some air conditioning systems are legally required to undergo regular TM44 inspections among their maintenance.

These inspections are designed to improve energy efficiency, identify waste, and ensure systems are operating properly. Understanding how often TM44 inspections are required helps businesses stay compliant while also reducing unnecessary energy costs.

What Is a TM44 Inspection?

A TM44 inspection is an official assessment of an air conditioning system’s energy efficiency and overall condition.

The inspection is based on guidance from CIBSE TM44, which supports compliance with the Energy Performance of Buildings Regulations in the UK.

During the inspection, an accredited assessor reviews the air conditioning system to determine:

• Whether it is operating efficiently
• If the system is correctly sized for the building
• Whether maintenance appears adequate
• Opportunities to improve energy performance
• Potential ways to reduce running costs

The goal is not only to confirm that the system works. TM44 inspections focus heavily on efficiency and energy use, helping businesses avoid wasting electricity through poorly performing equipment.

The building owner receives a report outlining the findings and recommendations.

Which Buildings Need a TM44 Inspection?

In the UK, TM44 inspections are required for buildings with air conditioning systems that have an effective rated output of more than 12kW.

This threshold is often reached more easily than people expect. Multiple smaller units within the same building can count towards the combined output.

As a result, many commercial properties fall within the regulations, including:

• Offices
• Retail premises
• Restaurants and hospitality venues
• Healthcare buildings
• Warehouses and industrial units
• Schools and public buildings

If a system exceeds the 12kW threshold, the building owner or operator is responsible for ensuring inspections are carried out.

How Often Are TM44 Inspections Required?

TM44 inspections must usually be completed every five years.

This applies regardless of how frequently the system is used. Even if the building operates only seasonally or the air conditioning is not running continuously, the inspection requirement still applies if the system capacity exceeds the threshold.

If a building has recently installed a qualifying air conditioning system, the first inspection should take place within five years of installation.

Why TM44 Inspections Matter

Some businesses see TM44 inspections as simply another compliance task. They can actually provide practical benefits beyond meeting legal obligations.

Air conditioning systems often consume a significant amount of electricity, particularly in larger commercial buildings. If a system is inefficient or incorrectly configured, energy costs can rise quickly.

A TM44 inspection may highlight issues such as:

• Dirty filters restricting airflow
• Incorrect control settings
• Oversized systems wasting energy
• Poor maintenance practices
• Opportunities for upgrades or modernisation

Addressing these issues can help reduce running costs while improving overall performance.

Inspections also encourage businesses to take a more proactive approach to maintaining cooling systems rather than waiting for faults or breakdowns to occur.

Failure to carry out a required TM44 inspection can result in penalties from local authorities.

Building owners may be asked to provide a valid TM44 inspection report, and failure to produce one could lead to enforcement action or fines.

Beyond compliance, skipping inspections may also mean businesses overlook inefficiencies that increase operational costs over time.

Staying Compliant and Efficient

TM44 inspections are an important part of managing commercial air conditioning systems in the UK. For buildings with systems over 12kW, inspections are legally required every five years and help ensure equipment operates efficiently and responsibly.

While compliance is a key reason for arranging inspections, the wider benefits are just as valuable.

Robinsons Facilities Services arranges TM44 inspections for commercial buildings across Yorkshire and the North of England.

All inspections are carried out by qualified, accredited energy assessors with experience across a wide range of commercial and industrial system types. Call our Yorkshire Head Office about TM44 Inspection.