| We are often asked what the difference is between a SAP EPC (Energy Performance Certificate) and a standard EPC. | ![]() |
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It refers to a certificate created by an On Construction Domestic Energy Assessor, using SAP 2009 methodology and software. Any new dwelling, or dwellings created by conversion or change of use are required to have SAP Calculations carried out. The assessor will then in turn produce an EPC outlining the energy efficiency of that build.
The assessor will use architects plans and drawings, together with detailed information around construction, heating and ventilation amongst others.
Most EPC's are required for existing dwellings as they are either being sold or let. This EPC would have previously gone into the Home Information Pack for prospective buyers or tenants to view. A Domestic Energy Assessor will visit the property, and using RDSAP (Reduced Data SAP) methodology will create the EPC.
The two versions of EPC are fundamentally the same thing, providing a picture of the energy efficiency and energy costs of the dwelling.
Generally an EPC for an existing dwelling will be less expensive to purchase than one derived from SAP Calculations.
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Build Energy Ltd, Unit 6 Silver Business Park, Airfield Way, Christchurch, Dorset BH23 3TA