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Design & Construction

New Homes

All new build dwellings require a SAP calculation which confirms compliance with Part L of the Building Regulations.


Resolution Energy is fully accredited through Elmhurst Energy to provide SAP calculations and Building Regulations Part L compliance. Claire has been an Elmhurst accredited SAP Assessor for over 13 years and has experience of working on a wide range of house and construction types.


  • We can assess new build housing and also conversions such as office to residential, or division of houses to flats.


  • We will review your drawings and advise on any improvements that may be needed, for example to insulation, air tightness, heating systems, ventilation or renewable energy technologies. SAP calculations do not generally require a site visit so we are able to offer this service nationwide.


  • On completion of the build we will provide the ‘As Built’ compliance reports for Building Control and lodgement of Energy Performance Certificates (EPCs).

We can help with

SAP calculations

Energy Performance Certificates (EPCs)

Part L compliance

Part G water efficiency calculations

new build regulations

SAP Calculations for Extensions

Extensions with large areas of glazing such as roof lanterns or bifold doors will generally need a set of SAP calculations which will be requested by your Building Control Officer. The SAP calculations are used to compare the proposed extension to the Building Regulations requirements, and effectively allow the higher amounts of glazing to be "offset" by making improvements elsewhere in the design of the extension.

  • We will review your design and advise of any changes that may be needed to meet the requirements.


  • We provide SAP calculations and a clear summary report for Building Control.

  • Extending your home can be a good time to consider how to make your whole home more energy efficient, we can advise on ways to further reduce your energy use and carbon emissions.

SAP calculations for extensions


'I have used Claire as an external consultant extensively for all our design work where we need to assess the thermal characteristics of existing properties and how to upgrade them and also how to achieve ever-increasing demands on the thermal efficiency requirements for new build residential developments. Resolution Energy has always provided a clear and informative solution.'


Chris Tomes

Tomes Architects


'We recently designed and built our own home and couldn't have done it without the help of the professionals. Claire at Resolution Energy has been absolutely amazing in guiding us through the Building Regulations and providing an extensive SAP report, as required for NFDC.  Nothing was too much trouble, she was always on the end of the phone and such an asset when the stress levels were rising.  Would highly recommend this company without reservation.'

Vicki Gritt, Fawley, Hampshire

'Resolution Energy worked quickly and efficiently to produce the SAP calculations, and were competitively priced.'

Sarah Porter, Midhurst, West Sussex

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