SAP Guides & Resources
Clear, practical articles to help you understand SAP Calculations, extension glazing rules, conversions, overheating (Part O) and thermal bridging. Written from the perspective of a working Elmhurst accredited assessor.
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These guides and articles are written to answer the questions we see most often from builders, architects and self-builders. They are not a replacement for project specific advice, but they will give you a solid understanding of how SAP, Part L, Part O and thermal bridging work in practice.
24 Dec 2025 • 5 min read
9 Dec 2025 • 3 min read
9 Dec 2025 • 5 min read
9 Dec 2025 • 6 min read
9 Dec 2025 • 4 min read
9 Dec 2025 • 4 min read
8 Dec 2025 • 5 min read
8 Dec 2025 • 3 min read
7 Dec 2025 • 6 min read
If your project is already with Building Control or you have drawings ready, you can skip the reading and go straight to booking.