Domestic Refurbishment / 2014 / 03 - Energy /

ENE 01 - Improvement in Energy Efficiency Rating

Information correct as of 22ndJune 2024. Please see kb.breeam.com for the latest compliance information.

Converting a non-habitable room into a habitable room - KBCN1327

If the refurbishment project involves a room, for example a garage, being converted into a habitable room, the pre-refurbishment SAP assessment needs to include this space in the total floor area. The energy assessment of this space will need to be based on the default values in SAP Appendix S or actual values where available.

Energy Efficiency Rating (EER) and primary energy demand – SAP 10.2 - KBCN1596

SAP 10.2 may be used to calculate the Energy Efficiency Rating (EER) and Primary Energy Demand. Although the carbon emission and primary energy factors have changed and better reflect actual impacts, there is no change to the baseline EER definition.

SAP box number for the energy efficiency rating (EER) - KBCN1325

The energy efficiency rating (EER) should be taken from box number 258 under section 11a. If the dwellings you are assessing are supplied by community scale CHP please use SAP Box 358 under section 11b

SAP box number if community scale CHP is used - KBCN0274

If the dwellings you are assessing are supplied by community scale CHP please use SAP Box 358 under section 11b CHP information is in a separate section of the SAP worksheet

Using different SAP versions (Full SAP or RdSAP) for pre and post-refurbishment - KBCN0202

You may use either Full SAP or RdSAP to calculate the energy efficiency rating. We allow both versions of SAP for flexibility and to help keep costs down, but we recommend that you use Full SAP both before and after refurbishment as this will give a more accurate result.


Information correct as of 22ndJune 2024. Please see kb.breeam.com for the latest compliance information.