The next revision of England’s Part L ramps up energy‑efficiency targets for every new dwelling. We unpack the draft requirements, show how early SAP modelling avoids last‑minute fabric upgrades, and share a checklist you can start using on projects breaking ground in 2026.

Floor‑to‑ceiling glazing can sink a planning application if you blow the 25 % heat‑loss limit. Learn three design tweaks—floor‑zone insulation, low‑g glazing, and strategic overhangs—that our assessors use to keep statement extensions bright and compliant across England’s varied climates.

With the introduction of Part O, London isn’t the only hotspot. We compare hourly simulation data from Manchester, Bristol and Norfolk to the simplified method results, revealing when full dynamic modelling is worth the fee—and how it can unlock design freedom for nationwide developers.