Air Tightness Testing
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Domestic | Commercial | Passiv Haus | Retro-fit
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ATTMA Certificates
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On-site Diagnostics & Re-testing
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Flexible Appointments
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Pre-test site checks on request
We deliver efficient ATTMA Certified, price match guaranteed Residential Air Tightness Testing services to meet all Part L1A & L2A Building Regulations compliance requirements.
Whether it be a single self-build, small projects or large scale development. With national construction companies we offer the same comprehensive service including full diagnostic reports and remedial advice from our team of skilled & highest ATTMA accredited engineers.
Single Test
Available From
Nationwide Air Tightness / Pressure Testing to a single plot including full remedial advice and diagnostics. We will even carry out same day re-testing if the remedial works can be completed within a time limit. This is above and beyond our competitors. Giving you some peace of mind and confidence in BREW Compliance Ltd.
Multiple Plot
Available From
Air Tightness Tests carried out to additional plots within the same site visit. This can help you achieve those last final CLM sign offs for the end of the month. As always, our knowledgeable technicians are here to help & work with you to achieve the required outcome.
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Air Tightness Testing Requirements​​
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​​Dwellings air pressure tested in Part L Building regulations outline that the minimum air tightness of a new building must achieve no worse than 8m3/(h.m2) at 50 Pa. Now common practice to see a target of 5 m3/(h.m2) at 50 Pa as an easy and cost effective way to help improve the DFEE (Dwelling Fabric Energy Efficiency) over the target generated in SAP as explained in more detail here.
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Testing must be conducted by an accredited engineer operating under a body such as ATTMA (Air Tightness Testing Members Association).
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BREW Compliance houses one the fully qualified technicians with ATTMA - including Commercial properties & Passiv Haus Dwellings.
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​ Depressurisation of dwelling to acquire air tightness leakage score.
(m3/(h.m2) at 50 Pa)
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Passiv Haus Testing Explained
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BREW Compliance are also fully qualified to carry out Air Tightness Testing for Passives Haus requirements (n50). Conducted using calibrated equipment and testing in accordance with
BS EN 13829.
The concept of Passiv Haus (translating to passive house) buildings was founded by a German physicist by the name of Wolfgang Feist. He started the revolution of more efficient and environmentally friendly buildings. The standard of passiv haus testing (n50) is more strict that than a usual air tightness test (q50). Strict measures are put in place in order to ensure a near completely air tight building. Saving fuel and money on heating and cooling passiv haus builds.
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Areas & volumes are calculated differently when our technicians carry out the size calculations.
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q50- Using Envelope Area m2
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n50 - Using Volume m3
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Passiv Haus has a set minimum target of 0.61. Written n50 ≤ 0.6 h-1 @ 50Pa. The result of any air test must be less than the set target to comply. Air tightness targets for traditional builds will be determined by the design stage SAP report.