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SAP (Standard Assessment Procedure) is the government's method for measuring a home's energy performance. Building control requires a SAP calculation whenever your project significantly changes the thermal envelope of your property — and failing to provide one can hold up your completion certificate.
Hampshire Build manages the entire process on your behalf: commissioning an accredited assessor, producing all required documentation and submitting it to building control — so you never have to chase anyone.
Covering Hampshire, Surrey, Wiltshire & Berkshire · Complimentary consultation, no obligation
Fixed Fee — No Surprises
Design stage through to building control submission — one price, everything included.
5–10 working days
Commissioning runs in parallel with your building regs drawings — no delay to your project
Building control will ask for a Part L compliance check in these situations — all core Hampshire Build services.
Any extension with significant glazing (bi-fold doors, roof lanterns, large windows) will need a Part L compliance check.
Adding a habitable room in a loft changes the thermal envelope of your home — SAP confirmation is standard.
Converting an unheated garage into a heated living space always requires an energy assessment.
A full SAP calculation is mandatory for all new dwellings — we manage this alongside your planning and building regs package.
You share your project details — we handle everything else.
Tell us your extension type, size, glazing and heating system. We take it from there.
Hampshire Build manages the accredited assessor on your behalf — no chasing, no coordination needed from you.
Your SAP report, Predicted Energy Assessment (PEA) and all documentation arrive ready for building control submission.
Once your build is complete, we arrange the final On-Construction EPC — required before your project is signed off.
Fixed fee + VAT. No hourly rates.
Planning approval rate
Projects completed
Years' experience
SAP calculations are one part of Hampshire Build's fully managed service: