Glossary of terms and abbreviations

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DEA: Domestic Energy Assessor. Person accredited to produce EPCs for existing dwellings. A DEA is not able to produce EPCs for new dwellings unless they have a separate accreditation as an 'On-Construction Domestic Energy Assessor' (OCDEA).


EPC: Energy Performance Certificate. Needed whenever a property is built, sold or rented. Provides information about a property's energy use & typical energy costs as well as recommendations about how to reduce energy use and save money. Classifies properties from A (most efficient) to G (least efficient). Valid for 10 years.
For domestic dwellings the EPC is either produced from SAP software as part of the SAP assessment of new dwellings or using RdSAP for existing dwellings. EPCs can only be produced by individuals accredited to carry out the assessment and produce EPCs.
There are some exemptions from the requirement for EPCs such as listed buildings or buildings due to be demolished.


FEE: Fabric Energy Efficiency, An indicator of energy performance based on energy consumption per unit floor area. Prefixed by T (TFEE) for Target Fabric Energy Efficiency or D for Dwelling Fabric Energy Efficiency,
Units of measurement are kWh/square metre/yr.


RdSAP: Reduced Data Standard Assessment Procedure. Methodology used to assess the energy rating of existing dwellings. Carried out by a Domestic Energy Assessor (DEA) who will visit the property and collect data concerning the property including its construction, dimensions, insulation and services. Similar to SAP but uses a reduced data set (hence the name). Used to generate an EPC for existing dwellings.


SAP: Standard Assessment Procedure is the methodology determined by the Government for assessing  the energy rating of dwellings.
Methodology is based on the BRE Domestic Energy Model (BREDEM).
Currently carried out using SAP 2012 version 9.92 software dated October 2013.


Thermal Bridging:
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