Free tool
Design-stage information checklist
Who runs your contract
Awais Sarwar, MSc — Accredited Energy Assessor
Awais is an accredited domestic and commercial energy assessor and the owner of Team EPC Ltd, which trades as Part L Consultant. He has surveyed and lodged EPCs across flats, houses, HMOs, managed portfolios and commercial premises throughout London and the Home Counties, and is currently studying an MSc in philosophy alongside running the business.
Off the clock: cricket, family time, an MSc in philosophy in progress and finding London's best food.
Awais Sarwar
Founder · Accredited energy assessor
New dwellings — calculated with SAP 10
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Missing items are not a problem — send what you have and we will tell you what else the calculation needs before quoting.
Background
What a good information pack looks like
A design-stage calculation is only as good as the specification behind it. Plans and elevations tell us geometry; the build-ups, window schedule and services information tell us performance. Without the second half we have to assume, and assumptions written into a model become obligations on site.
The strongest packs name products. A window with a stated whole-unit U-value, an insulation product with a stated thermal conductivity, a heat pump with a model number: each of those replaces a cautious default with a real figure, and cautious defaults are what push a scheme into needing extra measures.
Send what you have, even if it is incomplete. We will tell you which gaps actually affect the outcome and which we can carry as assumptions until the specification firms up.
Also useful
The other Part L tools
Part L 2026 transition checker
Enter your building control application date and your start on site, and see whether that building keeps transitional protection under the published 2026 dates.
Part L 2021 vs 2026 comparison
A side-by-side of the two standards as published: dates, scope and requirements, with a source against every line and nothing stated that we cannot cite.
Extension glazing area check
Enter your extension's floor area, its new glazing and the openings it removes, and see whether it stays inside the 25% allowance or needs a calculation.
Part L fee guide
Pick your project type and scale for the guide fee band we quote from, and what the fee does and does not include. Every job gets a written quote.
