We produce design-stage SAP for Building Control approval, then the as-built SAP and EPC on completion, using SAP 10.2 and the Part L 2021 targets. You'll get a clear specification to build to, not just a pass or fail.
When you'll need it
- Before Building Control approval on new dwellings
- Change of use conversions creating new homes
- Extensions with a high proportion of glazing
- On completion, to produce the as-built SAP and EPC
What's included
- Design-stage SAP with DER, TER, DFEE and DPER results
- Specification advice to pass without over-engineering
- Water efficiency calculation (Part G)
- As-built SAP using site evidence and test results
- On-construction EPC lodged for completion
- Building Control liaison and BREL report
SAP calculations FAQs
When should I get SAP calculations done?
As early as possible, ideally once your layouts and wall build-ups are settled. Early SAP lets us steer the specification so you don't have to change windows, insulation or heating late in the day.
Do extensions need SAP calculations?
Most don't, as they can follow the elemental route. You'll need SAP if the extension has more glazing than the guidance allows, or if you're trading off one element against another.
What's the difference between design and as-built SAP?
Design SAP uses the drawings and intended specification for Building Control approval. As-built SAP updates it with what was actually built, including air test results, and produces the EPC.
