Guides
Plain-English guides to the testing new homes need in England, with the sources we used. They summarise published guidance; they aren't compliance advice. Your building control body has the final say.
Air testing
Part L 2026: what changes for air testing
The Future Homes Standard dates, what stays the same for air tests, and what changes, including the tighter notional dwelling.
Read the guideWhat happens if an air test fails
The two ways a home can fail, what the regulations say, finding the leaks, fixing them properly and booking the retest.
Read the guidePreparing a plot for an air test
What "ready" means, what the tester will close or seal, and how to avoid a wasted visit.
Read the guidePart E and Part O
Sound testing: what Part E needs
Performance standards, how many sets of tests, when to test, what happens on a fail, and Robust Details.
Read the guidePart O overheating: simplified method or TM59?
The two routes to compliance, when each one fits, and the limits Approved Document O puts on TM59 modelling.
Read the guideServices
How TestConnect handles each test.