BM TRADA is a UKAS-accredited and registered member of Air Tightness Testing and Measurement Association (ATTMA). BM TRADA is independently approved to carry out air leakage testing of all commercial and domestic building types.

Testing is conducted based upon ATTMA Technical Standards (required by the current revisions of Building Regulations Approved Document L1 & L2) and CIBSE TM23. BM TRADA's air tightness testing services BM TRADA delivers a comprehensive air tight-ness testing service with no hidden extras. We provide added value by helping our clients to achieve ongoing improvement based on practical guidance and advice before, during and after air tightness testing.

The ATTMA Scheme

In January 2015, the ATTMA Scheme for Competent Air Tightness Testing Firms and their Testers (The ATTMA Scheme) was launched. There are three levels of tester:

  • Level 1: Testers can test dwellings and non-dwellings up to 4000m3 gross envelope vol-ume when tested as a single entity, with a sin-gle fan.
  • Level 2: Testers can test all buildings except large, complex and or high-rise buildings and or phased handover or zonal buildings unless part of a team managed by a Level 3 tester.
  • Level 3: Air tightness experts who can cover large, complex and or high-rise buildings and or phased handover or zonal compartmentalisation.

What is air tightness testing?

Air tightness is about minimising the uncontrolled flow of air both into and out of a building through gaps and cracks.

Uncontrolled air flow accounts for a large proportion of the energy wasted in buildings. Achieving improved air tightness is a key factor in building contractors meeting the Government’s targets for reduced carbon emissions and improved energy efficiency.

Air tightness is a key requirement of Approved Document L Parts 1 & 2 of the Building Regulations for England and Wales, without which, Building Control will not provide a Completion Certificate.