Air tightness testing is a recognised method of measuring the extent to which air is lost through leaks in the building fabric. It is often referred to as an air leakage test or air pressure test and is used as part of the SAP calculation.

All new dwellings are required to have a SAP (Standard Assessment Procedure) calculation prior to building control approval. It is ultimately the SAP calculation that determines the level of air permeability target needed to be achieved for the calculation to pass.

As part of a SAP calculation an air test figure is required when not using a default figure, this is achieved by pressure testing the new dwelling on completion. Government state that on each development an air test should be carried out on three units of each dwelling type or 50% of all instances of that dwelling type whichever is the less. A block of flats should be treated as a separate development irrespective of the number of blocks on the site.

At North Kesteven we are now in a position where we can offer to carry out your air test for an additional cost of £250 incl Vat.

If you need further information please contact the Building Control team by telephone or email. Alternatively you can write to or visit a Building Control Officer at our Sleaford Offices: Building Control Services, North Kesteven District Council, Kesteven Street, Sleaford, Lincolnshire, NG34 7EF