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Home > Overview - SAP Calculations
Overview - SAP Calculations Print
SAP 2005

The Government's Standard Assessment Procedure for energy rating of dwellings provides indicators of the energy consumptions per unit floor area, an energy cost rating ( the SAP rating), an Environmental Impact rating (based on CO2 emissions) and a Dwelling CO2 Emission Rate (DER).

More information on SAP and the document can found on the BRE website.

SAP Rating

  • Based on energy costs from space heating, water heating, ventilation and lighting
  • Energy costs can be offset against energy generating technologies (i.e. solar water heating, PV panels etc.)
  • The SAP rating is defined on a scale of 1 to 100 (the higher the number the lower the running costs)

SAP ratings can only be produced by a suitably qualified individual using an approved software package (for more information see the BRE website).

Our software is accredited by the DfEE and we are licensed to provide SAP calculations under a Quality Assured Scheme.

 

Environmental Impact Rating

  • Based on annual CO2 emissions from space heating, water heating, ventilation and lighting

  • CO2 emissions can be offset against energy generating technologies (i.e. solar water heating, PV panels etc.)

  • The Environmental Impact rating is defined on a scale of 1 to 100 (the higher the number the better the standard)

Both the SAP rating and the Environmental Impact ratings are adjusted so that they are independent of dwelling size for a given form.

 

Dwelling CO2 Emission Rate

  • Used to check compliance with the Building Regulations

  • Gives the annual CO2 emissions from space heating, water heating, ventilation and lighting per m2 of unit floor area

  • CO2 emissions can be offset against energy generating technologies (i.e. solar water heating, PV panels etc.)

The DER is compared with the TER (Theoretical CO2 Emissions Rate) for the proposed dwelling. Currently the DER is to be 20% better than the notional building described in Appendix R of the SAP document.