We provide OCDEA-accredited SAP calculations and EPC certificates for new dwellings, conversions and highly glazed extensions across Cornwall and the wider South West. SAP evidences Part L compliance by calculating heat loss, fuel costs and CO₂ emissions.
A whole-dwelling assessment of energy use, fuel cost and CO₂ emissions. Required for Part L Building Regulations compliance for new builds and many conversions.
Produced from the SAP model and lodged on completion, the EPC shows an A–G rating. New-build EPCs must be produced by an accredited OCDEA.
Eligibility
Three common scenarios
All new homes require SAP at Design and As-Built stages and an EPC at completion.
Barns, offices or flats changed to residential use typically require Part L1B SAP.
Where glazing exceeds 25% of extension floor area, SAP can demonstrate compliance.
Two phases. Engage us early for more options and fewer surprises.
Checklist
Send drawings/specs electronically or by post — we’ll take it from there.
PDF, DWG/DXF, JPG/PNG all fine. We’ll confirm anything else we need.
Email drawings & spec or post to: EAC South West, 12 Mount Lidden, Penzance, TR18 4PA
SAP provides a numeric score (1–100+) for annual energy cost, considering:
If the initial design doesn’t comply, we’ll propose pragmatic, usually cost-effective adjustments to achieve Building Regulations Part L compliance. Multi-plot developments qualify for discounts.
Guidance
Add as much effective insulation to walls, floors and roofs as practical.
Specify low U-values; consider g-values where relevant.
Efficient plant + smart controls. Zoning and load/weather compensation help.
Target a strong test result; seal the envelope (e.g., parge coat).
Use Accredited or Enhanced Details to reduce losses and condensation risk.
The earlier we’re involved, the more options you have and the fewer cost surprises.
Send your drawings and spec — we’ll turn around a clear, compliant SAP/EPC package fast.
Yes—across Cornwall and the South West. We deliver Design and As-Built SAP, plus EPC lodging on completion.
We suggest practical, cost-effective changes (fabric, openings, services, airtightness) to achieve Part L compliance.
We offer responsive turnaround and multi-plot efficiencies for developments of the same type.