New Build SAP Calculations
Design and As Built SAP Calculations for individual self-builds and small housing developments, including BREL reports and EPCs.
- ✔ SAP 10 compliant reports
- ✔ Design & As Built stages
- ✔ Air test results incorporated
SAP Calculations Across the UK
SAP Calculations for New Builds, Conversions & Extensions
Fixed-price SAP Calculations completed by an Elmhurst accredited OCDEA with hands-on construction experience. Clear Part L guidance, fast turnaround and compliant reports for Building Control.
Prefer to talk to someone? Call 0333 567 9010.
Elmhurst Accredited
Part L Compliant
Fully Insured
Fast Turnaround
Nationwide Coverage
SAP Calculations Made Simple for Busy Project Teams
SAPgen exists to take the stress out of Part L compliance. Instead of opaque reports and vague feedback, you get clear, practical advice from someone who understands both the regulations and how buildings are put together on site.
Whether you are a small builder, an architect managing multiple plots, or a homeowner trying to get a self-build over the line, you work directly with an Elmhurst accredited OCDEA who has previously run a building company and now operates daily as a domestic and non-domestic energy assessor.
The result: no guesswork, no jargon – just clear steps to get your SAP sorted and keep Building Control happy.
SAP Calculations for Your Project Type
Choose the service that matches your project. If you are not sure which option fits, send us your drawings and we will point you in the right direction.
Conversion SAP Calculations
SAP for barn conversions, commercial-to-residential schemes and dwellings split into flats, including guidance on new thermal elements.
- ✔ Material change of use support
- ✔ New thermal element checks
- ✔ Design & As Built options
Extension SAP & Glazing Rule
SAP support for highly glazed rear, side and wrap-around extensions where the 25 percent glazing guidance is exceeded.
- ✔ 25% glazing rule explained
- ✔ Whole-dwelling checks
- ✔ Practical improvement options
How the SAP Process Works
The process is intentionally simple. You send your drawings, we complete the SAP, then we work with you on any tweaks needed to get a pass.
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1
Share your drawings & details
Send floor plans, elevations, sections and your outline specification. If anything is missing, we will highlight it before we start.
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2
We model the dwelling in SAP
We build an accurate SAP 10 model, check it against Part L targets and provide clear feedback if improvements are required.
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3
You receive reports for Building Control
Once the design passes, we issue the SAP reports (and BREL / EPC where applicable) ready for Building Control and your records.
Clear, Fixed Pricing – No Surprises
SAP pricing is published and transparent, with discounts for multiple plots and reduced follow-on fees when you ask us to complete both Design and As Built SAP stages. No hidden extras, and no unexpected invoices weeks after the job.
Why Choose SAPgen?
Many SAP providers focus purely on ticking the software boxes. SAPgen goes further by combining accredited energy assessment with real-world construction experience, so the advice you receive is practical, buildable and cost-aware.
You benefit from a founder who has:
- Previously run a building company with hands-on knowledge of construction and detailing.
- Active experience as a Domestic Energy Assessor (DEA) and Non-Domestic Energy Assessor (NDEA).
- Accreditation as an On Construction Domestic Energy Assessor (OCDEA) with Elmhurst Energy.
That combination means you get SAP reports that satisfy Building Control, plus realistic routes to a pass that fit your budget and build programme.
Common Questions About SAP Calculations
A few of the questions we are asked most often. Visit the FAQ page for more detail, or contact us if you would prefer to talk it through.
What projects do you complete SAP Calculations for?
We provide SAP Calculations for new build houses and flats, dwelling conversions (such as barns and commercial-to-residential projects) and domestic extensions that trigger Part L requirements. If you are unsure whether your project needs a SAP calculation, send us your drawings and we will confirm this for free.
How much does a SAP calculation cost?
Pricing depends on the project type, number of bedrooms and number of dwellings. As a guide, single new build dwellings typically range from £220 to £350 per stage, with discounts for multiple plots. SAP for extensions usually starts from £150. Our full price list is available on the pricing page, and we will always confirm a fixed fee before you commit.
How quickly can you complete a SAP calculation?
Most single-dwelling SAP Calculations are completed within two to three working days once we have all drawings and specifications. Where capacity allows, a fast-track option is available for urgent projects, which you can choose during the online booking process.
Do you work with builders, architects and homeowners?
Yes. We regularly work with small builders, architects, developers and self-builders. Whoever instructs us, the goal is the same: clear guidance, compliant SAP reports for Building Control, and practical advice that works on site as well as on paper.
Ready to get your SAP Calculation?
All SAP calculations completed by an Elmhurst-accredited OCDEA and accepted by Building Control nationwide.