How much is a SAP calculation?
Single dwelling from £180. Small sites (2–10 plots) from £950 project fee. Medium schemes individually quoted within 24 hours of drawings.
A SAP (Standard Assessment Procedure) calculation is the government-approved method of demonstrating compliance with Building Regulations Part L for new dwellings, conversions and extensions. We deliver SAP 10.2 calculations nationwide from your drawings — no site visit required at design stage.
At design stage for new-build dwellings (Part L1A), for material change of use conversions creating a new dwelling, and for extensions above certain glazing thresholds. Also required for as-built EPC lodgement at completion.
SAP 10.2 is the current version of the UK Standard Assessment Procedure. It models fabric U-values, thermal bridging, ventilation, heating, hot water, lighting and renewables to produce a Dwelling Emission Rate (DER) compared against the Target Emission Rate (TER).
The Home Energy Model (HEM) is expected to replace SAP for new dwellings in coming years. We track the transition and will move projects onto HEM once it is the required methodology.
Scaled architectural drawings (PDF is fine, DWG/IFC even better), fabric specifications (U-values or build-ups), heating and hot water system details, and any renewables specified. We turn a single dwelling around in 5 working days from receipt of the pack.
At handover we return to produce the as-built SAP and lodge the on-completion domestic EPC. Substitutions during construction can be modelled at that stage.
Single dwelling from £180. Small sites (2–10 plots) from £950 project fee. Medium schemes individually quoted within 24 hours of drawings.
Not at design stage — SAP is a fully desktop calculation from drawings and specifications. At handover we visit for the as-built EPC.
SAP is used for new-build design compliance under Part L. RdSAP (Reduced-data SAP) is used for domestic EPCs on existing dwellings. Both use the same underlying methodology but SAP has full inputs; RdSAP uses standard defaults where data is unavailable.
Yes — SAP is a desktop service, so we work nationally. Only as-built EPC lodgement requires a site visit, which is restricted to our South West patch.
Send drawings — get a SAP quote
Call 01392 980077 or get a quote online.