Airtightness test in Isleworth

You will need this test to get your final sign-off from building control. The law requires it for almost all new builds and some large home projects.

• Book it once the property is finished
• Ensure all windows and doors are fitted
• Finish all plumbing and electric work first
• Get it done before your final certificate
• Use it to reach higher energy ratings

A specialist will fit a large fan into one of your external doorways. They use this fan to pull air through the building and find any hidden leaks.

• The house must be empty of workers
• Keep all external doors and windows shut
• The test takes about two hours total
• Engineers might use smoke to find leaks
• You get a score for the building

A well-sealed house is much cheaper to run and more comfortable to live in. You will notice fewer cold spots and lower energy bills every month.

• Keeps your expensive heat inside the home
• Reduces your carbon footprint every year
• Prevents dust and noise from entering
• Helps your heating system work better
• Makes your home feel much warmer

The test measures how much air escapes through the structure of your house. It ensures you are not wasting money on heating that just leaks out through gaps.

• It checks gaps around pipes and wires
• It measures air pressure in every room
• It confirms the builder did good work
• It helps stop cold draughts in winter