If your building uses air conditioning systems that total 12kW or more, you need a TM44 inspection. But how often is a TM44 inspection required, and what happens if you miss one?

In this blog, we’ll make it simple what the rules are, why they matter, and how often you required TM44 Inspection.

What Is a TM44 Inspection?

A TM44 inspection is a legal requirement under the Energy Performance of Buildings Regulations. It applies to air conditioning systems with a combined output of 12kW or more.

The inspection assesses:

• Energy efficiency
• Operational effectiveness
• Opportunities for improvement

GOV.UK: TM44 Requirements

 How Often Is a TM44 Inspection Required?

TM44 inspections must be carried out every 5 years.

This rule ensures that:

• Systems remain energy efficient
• Buildings remain compliant with current regulations
• Building operators receive actionable recommendations

If your system hasn’t been inspected in 5 years, you are likely already non-compliant. 

Missed deadlines can result in fines of up to £300 per unit

Why 5 Years?

Inspections every five years strike the right balance:

• Frequent enough to catch inefficiencies
• Infrequent enough to remain cost-effective
• Aligned with energy-saving targets across the UK

According to CIBSE, regular inspections can help cut cooling energy use by up to 40%.

Who Needs One?

You must arrange a TM44 inspection if:

• You own the building
• You operate or lease the space with control over systems
• Your AC system has a combined output ≥12kW

Even if individual units are smaller, they are counted together.

Changing building management? New controllers have 3 months to arrange the inspection.

Why Work With Gradwell Group?

At Gradwell Group, we simplify TM44 compliance:

• 24 hour return available on SAP Calculations and more.
• Accredited, experienced energy assessors
• Nationwide coverage
• Automatic renewal reminders
• Clear, scannable inspection reports

Book your TM44 inspection today.

FAQs

1. Is there a grace period after 5 years?

No. Fines apply immediately once out of compliance.

2. Do split systems count together?

Yes. The total cooling capacity is what matters.

3. Can TM44 inspections reduce bills?

Yes. Small adjustments can lower energy use by 10–40%.

Final Thoughts

TM44 inspections aren’t just about compliance. They help uncover inefficiencies, reduce operational costs, and ensure your air conditioning is running at its best.

At Gradwell Group, we handle the paperwork, the inspection, and the follow-up so you can focus on running your business.

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