An Energy Performance Certificate (EPC) shows the Energy Efficiency Rating (EER) and an Environmental Impact Rating (EIR) of a property on an A-G scale (A being the most efficient and G being the least).
The EER is rated in terms of energy costs, while the EIR is rated in terms of carbon emissions. These alphabetical bands are linked to a numerical score from 0-100 points (100 being the most efficient and 0 being the least).
The energy rating on your EPC is based on the Standard Assessment Procedure (SAP) however existing properties are assessed using the Reduced Data SAP (RdSAP) which is a simplified version of the full SAP methodology. The EPC requires fewer data inputs than the full SAP and is a less invasive survey.
A Full SAP EPC must be undertaken on properties built after April 2008, this includes new builds, conversions, and changing the number of dwellings within a property for example a 4-bedroom house changing into 2 flats. The full SAP EPC can be used for sale and rental in the same way as a standard EPC (RdSAP) and is valid for 10 years.
The PAS 2035 Retrofit Assessment is carried out prior to any retrofit installation and should always be carried out by a fully qualified Retrofit Assessor. Project scope depends on the required improvement measures, risk level, and the type of building.