What is a SAP Calculation?

SAP Calculations

What is a SAP Calculation?

The Standard Assessment Procedure (SAP) is the system put in place by the Government to assess the overall energy efficiency of a dwelling. A SAP Calculation when completed will show the resulting C02 emissions from a property.

The Standard Assessment Procedure is also used to produce the Energy Performance Certificate (EPC) which is required on completion of a build.

SAP Assessors are required to use approved software to show the following information.

  • Target Emission Rate (TER)
  • Dwelling Emission Rate (DER)
  • Target Fabric Energy Efficiency (TFEE)
  • Dwelling Fabric Energy Efficiency (DFEE)

What is taken into account when completing a SAP Calculation?

  • The heat loss perimeter and floor area and volume of the dwelling
  • The levels of insulation in the floor, external walls and roof
  • Windows and other openings (Thermal Performance)
  • Main heating system and main heating fuel
  • Secondary heating (Such as wood burners or gas fires)
  • Thermal bridging
  • Percentage of low energy lighting
  • Any additional mechanical ventilation systems
  • Air tightness result (Design figure will be proposed) Lower the result the better!
  • Water heating
  • Any renewable technologies used