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SAP Calculations and EPC’s

Under Part L of Building Regulations all new buildings, including renovations and extensions, need their energy and CO2 emissions to be shown in a SAP calculation before work can commence on site.

Standard Assessment Procedure – or SAP – has been a requirement for new dwellings in the UK since 2006.

SAP calculations require the designer to ensure the heat loss of the building does not exceed target values. Thermal elements (walls floors and roofs), heating, hot water, lighting, air tightness and ventilation are all measured, converted into CO2 emissions and compared against the target emissions rate.

A SAP calculation will need to be provided for Building Control at the design stage of the building and on completion, to ensure the project can progress.  When the calculation has been performed a rating between 1 and 100+ will be given to the dwelling.  The higher the SAP rating, the lower the C02 emissions and fuel costs.

A ‘pass’ rating must be achieved for the building to progress and eventually be let or sold.

Once the SAP rating has been decided, this in turn informs the Energy Performance Certificate (EPC) which must be shown to all prospective tenants and buyers.

A ‘pass’ rating is achieved by complying with standards relating to:

  • How well the building retains heat
  • On-site renewable energy technologies
  • Solar gains from windows and doors
  • Heating, hot water and mechanical ventilation systems

What we can do to help…..

The Carbon Green Team will give you all the help you need to pass the Regs.  If you simply require “U” Value Calculations for thermal elements, we can do these too!

At the end of your project we will issue an Energy Performance Certificate (EPC) to give to the Building Control Officer or inspector to demonstrate compliance.

If you have SAP calculations you’d like us to complete for you, we’ve created an online tool to help you submit all required information. Check it out here.

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If you'd like to talk to us about your project, do get in touch.

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