What is air tightness testing?
Air tightness testing measures uncontrolled air leakage through a building's envelope and is mandatory under Part L of the Building Regulations for all new dwellings in England and Wales. The result feeds directly into SAP calculations.
Who needs this certificate?
- New-build developers (every plot, Part L)
- Self-builders pre-completion
- Passivhaus and EnerPHit projects
- Commercial premises sub-500m²
What's included
- Blower door fan and pressure rig set-up
- Pressurisation and depressurisation test
- Leakage rate calculation in m³/(h·m²) at 50Pa
- Smoke pencil leak detection
- ATTMA Lodged certificate within 24 hours