Our Price List
SAP Calculation Cost 2026
Find the cost of the SAP Calculation for your project.
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How Our SAP Pricing Works
We keep SAP pricing as simple and transparent as possible. New Builds and Conversions use the same structure based on the number of bedrooms, while Extensions are priced by floor area and complexity.
Prices are per dwelling and apply to one of the following:
- As Designed SAP Calculation or
- As Built SAP Calculation with EPC (including BREL where required).
If we have already completed the As Designed SAP for a dwelling and you later instruct us to produce the As Built SAP with EPC for the same plot, a reduced follow-on fee of £80 per dwelling applies.
New Build & Conversion SAP Pricing
Use this table for new-build houses, flats and conversions (e.g. barn conversions, office-to-residential, houses split into flats). The price is per dwelling, per stage, either an As Designed SAP or an As Built SAP with EPC.
| Bedrooms | 1 Dwelling | 2–4 Dwellings | 5–9 Dwellings | 10+ Dwellings |
|---|---|---|---|---|
| New Builds & Conversions (Per Dwelling) | ||||
| 1 bedroom As Designed OR As Built + EPC | £220 | £190 | £150 | From £100 (quoted) |
| 2–3 bedrooms As Designed OR As Built + EPC | £280 | £240 | £170 | From £125 (quoted) |
| 4–5 bedrooms As Designed OR As Built + EPC | £350 | £280 | £190 | From £150 (quoted) |
| 6+ bedrooms / complex Highly glazed, MVHR, renewables, unusual build-ups | Contact us for an accurate quote | |||
Upgrade: If we have already completed the As Designed SAP for a dwelling, the follow-on As Built SAP + EPC is £80.
For what’s included in these fees, see our New Build SAP service and Conversion SAP service pages.
SAP Pricing for Extensions
SAP Calculations for extensions are usually required where glazing exceeds the allowance in Part L or where Building Control request a whole-dwelling heat-loss check. Pricing is based mainly on the extension floor area and how much of the existing property needs to be modelled.
The prices below are per extension, per stage – either an As Designed SAP or, where required, an As Built SAP for the whole dwelling.
| Extension Size (m²) | Stage / Scope | Price |
|---|---|---|
| Single Extension Requiring SAP | ||
| Up to 25 m² | As Designed or As Built | £150 |
| 25–40 m² | As Designed or As Built | £180 |
| 40–70 m² | As Designed or As Built | £220 |
| 70+ m² or complex alterations | As Designed or As Built | From £260 (quoted) |
As with new builds, if we have already completed the As Designed SAP, a follow-on As Built SAP for the same project is charged at £80.
If you’re unsure whether your extension needs SAP, our extension SAP guide explains the glazing rule and common scenarios.
What’s Included in Our SAP Fees
- Either an As Designed SAP Calculation or an As Built SAP Calculation with EPC for each dwelling instructed.
- Clear advice on any changes needed to achieve a pass at the chosen stage.
- Reasonable design revisions where required.
- BREL report issued with As Built SAP where required by Building Control.
- Email and phone support throughout the project.
Extras & Assumptions
In most cases the prices above are all you pay. Occasionally additional work is needed – for example where designs change significantly mid-project or where multiple alternative specifications need to be modelled.
- Major design changes after a pass has been achieved may be charged as a new instruction or a reduced follow-on fee.
- Very complex or highly bespoke projects, and larger developments over 10 dwellings, may be quoted individually.
- Air testing, on-site surveys and other third-party costs are not included.
Ready to Book Your SAP Calculation?
Use our online booking form to get a fixed price for your project, or send us your drawings if you’re not sure which option applies.