Air Testing for New Builds

Air Tightness Solutions provides a cost-effective solution for all Domestic New Build Air Tightness testing requirements, whether you’re a small developer or a large housing contractor. 

Building regulations require a proportion of new build houses, flats, and bungalows to undergo air permeability or air leakage testing before completion. We can help you identify how many properties need to be tested, conduct expert testing, help you identify issues that might affect your test result, and produce on-site certification to verify your test results. 

Our New Build Air Testing Service

We provide a nationwide pressure testing service which is delivered within 72 hours of your order. All domestic air tests are undertaken by ATTMA accredited engineers to ATTMA TSL1.

• Nationwide Coverage
• Fully Accredited Engineers
• Same Day Retest
• On-Site Certificate Accepted by Building Control
• Part L1A Compliance & Passive House Testing
• Localised Smoke Test & Thermographic Air Leakage Diagnostics

Air Tightness Solutions provide a free assessment to establish your air testing requirementsallowing the number of dwellings that require testing to be calculated. We will also help you decide when testing will be most cost effective for you and keep site disruption to a minimum.

Before we attend site to undertake an air leakage test to determine the air permeability of the buildings, we may require the following information:

• Regulations or Standards you are conforming to

• Site layout detailing the different construction forms and designs of houses you have on the development.

• Plans and sections for each house type. If there are different plans for sub-types such as terraced or semi-detached, these will also be required.

• Floor layouts for each apartment block on the development

• A build program if you would like us to suggest which plots to test.

• The Design Air Permeability, available from the SAP calculation.

Part L1 Compliance

Current legislation requires a sample of all newly built dwellings to be air tested to ensure compliance with Part L of the Building Regulations in England and Wales and Section 6 of the Scottish Building Standards. 

An Energy Performance Certificate cannot be issued without an Air Tightness Test Certificate. Your air leakage testing results must have an air permeability figure specified in the design SAP calculations. For one or two units, airtightness testing is not mandatory, but an assumed air leakage rate above the industry norm must be made, which may cause your overall assessment to fail.

If you want to find out more about domestic air testing, or simply need some expert advice, we’d be delighted to help


How many properties need testing?

The Building Regulations require that 50% of each home type in a development must be tested for air tightness. The definition of home types was expanded in the 2010 revision, and now includes differences in position – for example terrace and end terrace, or top floor and ground floor flats. Different construction details and different sized houses also count as different home types. 

In addition, the rules require that half of the plots that are tested must be within the first 25% of completed properties. If there are early test failures, you may be required to conduct more tests on that dwelling type to restore confidence. 

There are many variables when it comes to identifying which properties need to be tested – Air Tightness Solutions can help you identify exactly how many, and which, new builds you need to have tested, to ensure compliance with Part L Regulations. 

How does Air Tightness affect SAP Ratings? 

The SAP rating of a new build will be significantly affected by the rate of air leakage from the property – high levels of uncontrolled air leakage will naturally reduce the overall energy performance level of the building. 

In some cases, if properties are struggling to meet emissions targets, aiming for a lower air leakage result than the regulatory targets can help compensate for other areas affecting the SAP rating. 


Areas of Air Leakage in New Builds

Common problems affecting air leakage in new build homes, flats and bungalows include:

  • Pipework and plumbing
  • Skirting boards
  • Windows and doors
  • Eaves
  • Sockets
  • Recessed lighting
  • Behind dry lining

Air Tightness Solutions can discuss any concerns you may have and help you find solutions to ensure your air permeability is within accepted parameters.