It is recommended to carry out SAP Calculations at the design stage of your project initially, this is to review compliance for all elements of the build, in accordance with Building Regulations Part L. This allows for any amendments to be made prior to the build starting on site.
If your project has already commenced and SAP Calculations have not been completed, SAP Calculations can still be produced at this stage, we would just work with ‘as-built’ information rather than ‘as designed’.
On completion of the project, the SAP Calculations will be updated and an EPC produced.