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.
Prefer to talk to someone? Call 0333 567 9010.
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 Jan 2026 • 2 min read
3 Jan 2026 • 4 min read
2 Jan 2026 • 5 min read
27 Dec 2025 • 5 min read
27 Dec 2025 • 8 min read
27 Dec 2025 • 4 min read
26 Dec 2025 • 7 min read
26 Dec 2025 • 3 min read
25 Dec 2025 • 4 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.