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New Build EPC

We are often asked what the difference is between a new build EPC (Energy Performance Certificate) and a standard EPC.

It is crucial to produce the correct certificate in order to secure sign off with Building Control – and it is important to understand that new build EPC’s are produced in a different way.

new build epc

What is a New Build EPC?

It refers to a certificate created by an On-Construction Domestic Energy Assessor (OCDEA), using the SAP 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 new build. The assessor will use architects plans and drawings, together with detailed information around construction, heating and ventilation amongst others.

EPC for Existing Dwellings

Most EPC’s are required for existing dwellings as they are either being sold or let. This EPC is used to market the property and made available 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, but they are arrived at via different routes.

Generally an EPC for an existing dwelling will be less expensive to purchase than a new build EPC derived from SAP Calculations.

Would you like to discuss your project?

Call us for a chat on 0330 055 34 05 or email

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"Build Energy have been quick to provide a helpful and efficient service in several projects......their willingness to provide advice and first-class service exceeds expectations. We have had pleasure in dealing with the team in the past, have recommended their services to others and would do so again without hesitation........we look forward to a continued relationship in future projects."

Mark Warburton
- BeSpace Urban Design

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