Extension SAP, sorted fast.
The Part L SAP calculation your extension needs for Building Control — produced fast, priced up front.
Larger or heavily-glazed extensions have to prove Part L compliance, usually through a SAP calculation that shows the extension does not worsen the dwelling’s energy performance. We produce the calculation your Building Control Officer will ask for, priced up front with no hidden or extra fees, with unlimited specification revisions if the design changes.
Not sure you need all of these?
Send your drawings. We review them free of charge and quote only what your project actually needs. Nothing more.
How fast can you turn it around?
Most calculations are produced within a few working days of receiving your drawings. Working to a deadline? Tell us and we will prioritise your project.
Project a bit different?
Conversions, extensions, mixed and commercial schemes are all handled. One call on 01455 242297 confirms which package fits, in about five minutes.
“Absolutely amazing service. We urgently needed a SAP assessment and it was sorted within a week — a seamless, hassle-free service.”
- Design Stage + As Built SAP + EPCFrom £75
- + Unlimited SAP specification revisionsIncluded
- + Free Dashpivot collaboration appIncluded
- + Pre-quote drawings reviewIncluded
We confirm your full fixed price within 48 hours of seeing your drawings.
One service.
Done properly.
The Part L energy compliance an extension needs for Building Control — the SAP calculation (and EPC where a new dwelling is created).
Produced and lodged by accredited assessors, priced up front with no hidden or extra fees.
SAP Calculation
Design Stage plus As Built SAP plus the final EPC. Proves your Dwelling Emissions Rate meets the Target. The headline Part L compliance check.
- Design Stage SAP for Building Control
- As Built SAP and EPC at handover
- Unlimited specification revisions
What you can count on.
Set out in writing before you book — clear value up front, with no hidden or extra fees.
The number we quote is the number you pay
Every package is priced up front in writing. No mid-project surprises, no added line items, no hidden or extra fees. If scope genuinely needs to grow, we ask before we do a thing.
Produced to fit your build programme
Calculations are typically with you within a few working days of drawings arriving. Working to a tight deadline? Tell us and we will prioritise your project.
Produced by accredited assessors
Every calculation and certificate is produced and lodged by accredited assessors, so it is valid and accepted by Building Control.
From drawings to
sign-off.
Send details
Send your drawings and specification. We confirm a fixed price within 48 hours.
We produce it
Your calculation is produced by an accredited assessor, typically within a few working days.
Issued for sign-off
We issue the completed report and lodge any certificate, ready for Building Control sign off.
Real builds.
Real reviews.
Verified reviews from clients across the UK — the kind of work this package is built on.
“Excellent service! The team were knowledgeable, efficient and easy to work with. Our air tightness test was booked quickly and the results came through the same day. Would highly recommend.”
“Exceptional service at a fair price! Quick efficient communication, understood exactly what I needed to satisfy local building control and then made the process easy. I didn't have to chase them, was very clear about timescales and delivered ahead of time.”
“First class service from start to finish. Over the course of my two year build UK Building Compliance were always prompt with their response and made the whole process very smooth.”
Before you ask us.
Does my extension actually need a SAP calculation?
It depends on the extension. Building Control may accept compliance through limiting the glazed area or improving elements elsewhere, but larger or heavily-glazed extensions usually need a SAP calculation to demonstrate Part L compliance. Send your drawings and we will confirm what applies — at no charge.
How fast is it?
Most extension SAPs are produced within a few working days of receiving your plans and specification. If you are working to a deadline, tell us and we will prioritise your project.
What if the design changes?
Specification revisions are unlimited — change your glazing, fabric or heating and we re-run the calculation, no fee per revision.
Can you do this anywhere in the UK?
Yes. We cover England, Wales, Scotland and Northern Ireland, with the equivalent energy standards handled under the same price.
Send your drawings today.
From £75 + VAT, fully managed.
Fixed quote back within 48 hours. Nothing added after signature — no hidden or extra fees, everything set out in writing.
“We use UKBC for all our SAP calculations and EPC ratings. Always reliable, always on time, and the team genuinely understand what builders need. Top marks.” Martin Reid, Verified review
- SAP + EPC Fixed price
- Revisions, re-tests & diagnostics Included