Air testing for extensions is a crucial process that measures the air permeability of your new extension, ensuring compliance with specific building regulations. This test helps identify potential leaks, confirming if your building envelope is properly sealed. Effective air tightness reduces energy consumption, minimises heat loss, and enhances indoor comfort while lowering carbon emissions. To prepare, you should seal all gaps and cracks, temporarily seal ventilation systems, close all doors and windows, and inspect insulation. Professional assistance from experts like Ratio Seven can ensure thorough preparation and accurate results, making your home extension more energy-efficient and comfortable.