The build is just about complete now. some paperwork and formalities have to be done before completion sign off.
Firstly we had to have the building tested for it’s air permeability. This is done by pressurising the whole house with a blower door test kit and measuring the rate of leakage of air into or out of the building.
The test result was 1.44 m3 / h / m2, which the tester informed us was a good value.
That then fed into the As Build SAP report, along with other as built details like the exact windows fitted, and details of the final heating system, and the end result was the Energy Performance Certificate, which gave a Score of A94, a very satisfying result.