SAP (Standard Assessment Procedure)


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Standard Assessment Procedure (SAP) is the Government’s Standard Assessment Procedure for Energy Rating of Dwelling. It’s used to demonstrate the compliance for dwellings with Part L of the Building Regulations.

It is a legal requirement that a Design Stage SAP calculation is completed before any construction begins.

The principal steps in undertaking a SAP calculation are as follows:

  • Determine the overall dwelling dimensions
  • Calculate the rate of ventilation
  • Calculate the heat losses
  • Calculate the water heating energy requirements
  • Determine the internal gains
  • Determine the solar gains
  • Determine the mean internal temperature
  • Determine the degree days
  • Calculate the useful space heating requirement and then the delivered energy for this and for water heating
  • Determine the fuel costs from the delivered energy figures
  • Calculate the SAP rating
  • Calculate the carbon dioxide emissions
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Related Case Studies

New Four Bed Dwelling, Heversham
SAP (Standard Assessment Procedure) case study

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