Conversions/Barn Conversions start from £180
Though not as stringent as a SAP Calculation for a New Build, a Conversion still needs to meet certain standards which are set out in Approved Document L1B required to meet building regulations. U-Values for the External Walls, Floor, Roof , Windows and Doors need to be met. The overall efficiency of the dwelling will also take into account the Heating System, any Secondary Heating plus any Renewable Energy.