Cost guide
How much does a Airtightness test cost?
Thinking about an airtightness test for your new build or extension? You're likely looking at a cost of around £150 to £350 for this essential assessment. It's a key part of making sure your home is energy efficient and meets all the right standards. This test checks how well your building holds in heat by preventing unwanted drafts. A professional will use specialist equipment to measure air leakage. This helps you get your completion certificate, ensuring your home is cosy and efficient.
Typical price
£150 to £350
What changes the price
Property Size
Larger homes naturally take more time and effort to test, which can increase the overall cost.
Building Complexity
Unusual shapes or multiple sections might make the testing process a bit more intricate for the technician.
Location
Travel time and fuel costs for the assessor can vary depending on where you live in the UK.
Test Urgency
If you need the test completed very quickly, some firms may charge a premium for a speedy service.
Re-test Needed
If your building fails the first test, you'll likely need to pay again for a follow-up assessment.
Multiple Tests
Booking several tests at once, perhaps for different plots, might secure you a better rate per test.
Prices by region
| Region | Low | Typical | High |
|---|---|---|---|
| London | £200 | £325 | £450 |
| South East | £175 | £275 | £375 |
| South West | £160 | £250 | £350 |
| East of England | £160 | £250 | £350 |
| Midlands | £150 | £225 | £300 |
| North West | £150 | £225 | £300 |
| North East and Yorkshire | £140 | £210 | £290 |
| Scotland and Wales | £150 | £230 | £320 |
Questions people ask
What is an airtightness test?
It's a professional check to measure how much air leaks in and out of your building. This helps make sure your home is energy efficient and comfortable. It's often needed for new builds and extensions.
Why do I need an airtightness test?
This test is usually a must-have for building control approval. It proves your property meets energy efficiency standards. A good result means a warmer home and potentially lower energy bills for you.
How long does an airtightness test take?
Typically, the test itself can take around 2 to 4 hours, depending on your property's size and complexity. The assessor will also need time to prepare and provide the results.
What happens if my property fails the test?
If your property doesn't pass, the assessor will usually help identify where the air leaks are. You'll then need to make improvements to seal these areas before arranging a re-test to achieve compliance.
How can I prepare for the test?
Before the assessor arrives, make sure all external doors and windows are installed and closed. Also, ensure any internal doors are open and any ventilation systems are turned off, if safe to do so.
Can I do the test myself?
No, an airtightness test must be carried out by a certified professional. They use specialist equipment and methods to provide accurate, reliable results that building control will accept.