L1B SAP calculations conducted by experienced assessors.
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Extension SAP calculations
Extension SAP calculations - L1B
Extension SAP calculations need to be completed on a building extension that has glazing for more than 25% of the floor area.
On completion of your SAP calculation you will receive and EPC certificate showing you have complied with building regulation and have passed part L1B of building regulations.
What our SAP assessors need from you:
Drawings (For proposed and existing dwelling) :
Elevation, Section Drawings
Floor and Site Plans
Windows (Frame material, width of Gap, emissivity of glass)
Doors (Frame material, width of gap)
Heating and cooling
Hot water system (Cylinder size and controls)
Extension SAP calculations explained