PART O OVERHEATING COMPLIANCE GUIDE

You’re One Bad Glazing Call Away From Failing Part O

Look, here’s the deal: Part O isn’t optional. Planning and Building Control expect proof your homes won’t overheat. If you don’t check glazing limits by orientation, bedroom free-area (with secure night ventilation), and cross-ventilation, the Simplified Method will fail and you’ll be forced into TM59 at the worst possible time. I’ve seen schemes stall and budgets blow up because no one sanity-checked Part O early. Don’t be that guy. This guide shows you exactly how to test Simplified in minutes and when to switch to TM59—so you pass first time and keep your programme moving.

Here’s What You’re Getting

  • Simplified Method checklist: glazing %, orientation, free-area per bedroom
  • High-risk areas: shading options and g-value tips
  • TM59 in plain English: pass thresholds and mitigation
  • Fast route to a pass: design tweaks or modelling, step by step

Drop your email below. Get the Part O guide. Check glazing and free-area fast, see if you’re Simplified or TM59, and keep your programme on track.