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