• Know your design permeability value found in the SAP calculation and measured in m³/hr.m²
  • All external walls, floors and roofs to be completely installed.
  • All windows and doors should be fitted with draft proofing installed to all external doors where required.
  • All fittings should be installed (including electrical) any ducts to external air should be sealed.
  • Plumbing work should be completed with all sanitary ware installed. All traps require to be filled with water. Bathrooms and kitchens are common places for leakage through poorly sealed drainage pipes often hidden by kitchen units or bathroom fixtures. Before fitting bath panels, boxing in or vanity units etc, pipework should be checked to ensure an airtight seal is in place around the pipework.
  • Doors to unheated garages, loft hatches, coomb access hatches etc should all be fitted with draught excluders.
  • Mains power is available within the dwelling
  • The house must have a minimum of one external door of standard dimensions not more than 2.5m tall or 1.1m wide