Home Services Domestic Properties New Build SAP & EPCs

New Build SAP & EPCs

Standard Assessment Procedure (SAP) is the Government's recommended system for energy rating of domestic property (known as ‘dwellings’ within building regulations).  The Standard Assessment Procedure is used for:

  • Calculating the SAP rating based on the annual energy costs for space and water heating.  The SAP rating is used to fulfil requirements of the Building Regulations to notify and display an energy rating in new dwellings.
  • Calculating the Carbon Index based on the annual CO2 emissions associated with space and water heating.  The Carbon Index (CI) can be used to demonstrate compliance with Building Regulation Approved Document part L1 (England and Wales) and Technical Standards Part J (Scotland).

From 6 April 2008, all homes built and physically complete on or after this date, will need to have an EPC provided on construction (this is not the same EPC calculation for properties built prior to this date).  It is the responsibility of the builder to provide an EPC when a home is constructed and physically completed.  This also applies to any change of use to a new dwelling or if a building is converted into fewer or more units and changes are made to the heating, hot water provision or air conditioning/ventilation services.  We also provide SAP calculations for extensions including highly glazed areas.

When the home is physically complete, the builder must obtain an EPC for the home, provide the SAP/EPC to the new owner of the home and notify the local authority building control officers or approved inspectors that this has been done.  Building regulations include standards for the energy performance of new homes which builders must adhere to in order to comply with building regulations.  Once building control are satisfied the EPC has been properly produced and provided to the relevant party, they are able to issue a final completion certificate.  A final completion certificate for a home cannot be issued by building control unless they are satisfied an EPC has been provided.

SAP under Part L1A

All our SAP quotes include:

  • Numerous ‘what-if’ calculations to determine the most economical way to achieve compliance.  We try to avoid any defaulting (such as ‘thermal bridge’ and ‘thermal mass’ calculations, see below) to achieve the best results.
  • 'Design Stage' compliance documents (for Building Control or Planning).
  • All u-value calculations.
  • ‘Predicted SAP/EPC’ (if required) for marketing purposes before the ‘As-Built’ stage.
  • ‘As-Built’ stage compliance documents (for Building Control).
  • Lodged SAP/EPC for each property including all lodgement fees.
  • All ‘thermal bridge’ calculations using Accredited Construction Details (ACD) and/or Enhanced (ECD).  This is not the same as “repeating thermal bridges” which are included in u-value calculations.
  • ‘Thermal mass’ calculations.
  • Any ongoing monitoring and updating of changes (if any).

Further Information:

A guide to energy performance certificates for the construction sale and let of non-dwellings

Energy Performance Certificates and New Homes - A Builders Guide

Guide to EPC for Dwellings

Guide to EPC for Non-Dwellings

Improving the Energy Efficiency of our buildings - Guide for the marketing Sale and Let of Dwellings

Statutory Instrument - uksi_20123118_en

Statutory Instrument EXPLANATORY - uksiem_20123118_en


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Commercial EPCs
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Commercial Extensions or Conversions
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Domestic New Build (SAP)
Domestic Extensions or Conversions

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