New Building Regulations

Under Part L of the Building Regulations (Part L1A for dwellings, Part L2A for non-dwellings), all new builds in England and Wales must carry out air tightness testing. Since June 2022, every new-build plot requires its own individual test.

The purpose of the test is to ensure buildings are energy efficient and the home owner controling the air flow. Uncontrolled air leakage can account for up to 35% of heat loss, this will increase energy bills. A well-sealed building controls the air flow and maintains comfortable temperatures with lower heating costs.