Choose a test method

You must now carry out air permeability tests on all new homes using one of the following testing methods:

• the fan pressurisation method (also known as the ‘blower door’ test) - carried out at 50 Pa 
• the pulse method - carried out at 4 Pa

You must also show local building control that testers: 

• have received appropriate training 
• are registered to test the class of building they tested

Record test results, failures and fixes

You must record all test results, failures and how you went about fixing any issues and report everything to local building control.

Tests must be carried out until a new home meets the new regulations and reported to local building control.

If you do not comply with the new building regulations you could be prosecuted and fined.

Your local authority could make you pay for faulty work to be fixed and you won’t have the compliance certificates needed to sell a home.

Find out how to provide information for SAP assessors and building control. 

Provide calibration evidence

You must show local building control that test equipment has been calibrated by:

• a UKAS-accredited facility 
• the original manufacturer

You must also show the calibration took place within the previous 12 months or a period in accordance with manufacturer’s guidance. 

Calibration should be carried out in accordance with CIBSE’s TM43.

Keep up to date

Use the Future Homes Hub to keep up to date with changes to the building regulations and the introduction of the Future Homes Standard.

Check what you need to do to meet the new regulations through our detailed guides.

Find out more

Use our guide to find out how to improve fabric, airtightness and thermal bridging performance.

Find new regulations in the official Approved Documents on GOV.UK:

• Conservation of fuel and power: Approved Document L - ‘Part L’
• Overheating: Approved Document O - ‘Part O’
• Ventilation: Approved Document F - ‘Part F’