077968 46047
01395 742593

Air Permeability Test

SAP Calculations - EPC's - Air Permeability Testing - Water Calculations - Ventilation Testing

Air Permeability Test

As specialists not generalists we only deal with Part L, F and G of the building regulations.

We take time to understand each project, not only on a technical level but also on a client level. We recognise that every client is unique requiring unique solutions to move their project forward.

We stronlgly focus on communication and managing our client’s expectations.

each unit thereafter


(location must be the same)

  • Up To A Maximim of 6 Units a Day

For Domestic and Small Commercial Buildings


Pre-Test Info

During construction if you follow the mantra “build tight, ventilate right” you won’t go far wrong. The air permeability of new builds has become an integral component of Part L compliance. We can issue free advice and checklists prior to your test that will help you avoid the typical pitfalls.


The Test

We arrive on site at a time convenient to you. (We can also accommodate weekend tests). Once on site we prepare the dwelling for the air pressure test by temporarily sealing all allowable elements. Preparation for the test can take up to an hour while the test itself takes approximately 30 minutes. During the test we ask that no-one enters or leaves the dwelling.




Once the air pressure test is complete you will be informed instantly if your dwelling has achieved it’s design air permeability target. If it passes, great. If it fails we won’t leave site until we have identified where the air leakage is occurring. In many cases we are able to rectify minor air leakage passages ourselves and retest FOC on the same day.



We will provide you with your ATTMA air permeability test certificate. If you let us know your building inspector and SAP assessor details we can also forward the necessary documentation on to them.


OFFICE: 01392 683664          MOBILE: 077968 46047        EMAIL: info@pecairsap.com


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Top Tips

Air permeability testing is a central part of  SAP and SBEM calculations. The test determines how air tight a building is and contributes to the fabric calculation within SAP and SBEM. Most individual new buildings need an air test. Some dwellings can apply for an air test exemption but designers find the cost of upgrading heat loss elements needed to counteract the air test penalty prohibitively expensive.
O Ensure the company you use is accredited and uses calibrated equipment.
O Make sure your architect/SAP assessor has set a realistic air tightness target.
O Dot and dab plasterboard using the continuous ribbon method.
O Seal gaps between floors and walls before you put on skirting board.
O Caulk the top and bottom of all skirting.
O Seal gaps around the perimeter of all penetrations (electrical and plumbing).
O Penetrations, gaps between floors and/or pipework and plasterboard should be sealed before you box them in.
O Seal gaps between plasterboard and floors under kitchen units before the units are installed.
O Check that plasterboard and pipework behind bath panels have been properly sealed before the bath is installed.
O If installing spotlights use the correct core cutter and avoid poor quality or tilting spotlights.
O Eves cupboards, loft hatches and other openings to unconditioned spaces need to be as air tight as possible.