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SAP Calculations and Part L Compliance

Choice EPC provides SAP calculations for new homes, conversions and extensions across Surrey and London, to support Building Regulations Part L compliance.

SAP calculations from £[X] excluding VAT

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  • Accredited with [SCHEME]
  • Assessor no. [NUMBER]
  • Fully insured
  • Lodged on the government register

What SAP calculations are and when you need them

The Standard Assessment Procedure (SAP) is the government's method for calculating the energy performance of new dwellings. A SAP calculation is needed to show that a new home meets Part L of the Building Regulations, and it produces the on-construction EPC once the home is complete.

  • New-build houses and flats.
  • Conversions creating new dwellings, such as barns or offices converted to homes.
  • Some extensions, particularly where glazing exceeds the usual limits.

Part L compliance and the process

A design-stage SAP calculation is prepared from the plans and specification before work starts, and submitted to building control. It shows whether the design meets the targets and highlights changes if it does not.

Once the building is complete and the air test is done, the as-built SAP calculation confirms the final figures and the on-construction EPC is lodged.

What we need from you

  • Plans, sections and elevations.
  • Specifications for walls, floors, roof and windows.
  • Details of heating, hot water, ventilation and any renewables.
  • For the as-built stage, the air test result and any changes made on site.

How it works

  1. 1

    Get a quote or book

    Domestic EPCs can be booked and paid online with your chosen assessor. Commercial, MEES and SAP work starts with a quick quote.

  2. 2

    We visit and assess

    An accredited assessor visits, measures the property and records insulation, glazing, heating and lighting.

  3. 3

    Certificate lodged and emailed

    Your EPC is lodged on the government register and emailed to you, with recommendations for improving it.

Areas we cover

See every area we cover in Surrey and London

Useful next steps

Frequently asked questions

No. An EPC must be carried out by an accredited domestic or non-domestic energy assessor who is a member of a government-approved accreditation scheme. Being an electrician does not qualify someone to produce an EPC.

An EPC is valid for 10 years from the date it is lodged. You can commission a new one sooner, for example after improvement works, and the most recent certificate is the one that counts.

Use the gov.uk "Find an energy certificate" service. Search by postcode to see any valid certificate, its rating, its expiry date and the recommendations it lists.

Get a SAP calculation quote.

Send your drawings and specification and we will confirm a fixed price.

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