Will my design pass Part O?
Five questions about your scheme. An instant traffic-light verdict on your overheating risk, and a full breakdown of whether you are heading for the Simplified Method or a TM59 assessment.
Built by our experienced overheating and TM59 assessors
Question 1 of 5
Your verdict ·
Get your full report
The summary above is the headline. Your full report breaks down all five risk areas, what each one means for your Part O route, and exactly what to look at first.
Part O Overheating Risk Report
UK Building Compliance
Your five risk areas
Recommended next steps
Whatever your verdict, the first move is the same. Get your overheating assessment started at design stage.
Get my overheating quotePlease note: This report gives an indicative view based on five high-level questions and the typical behaviour of dwellings under Part O (Approved Document O, England). It is not an overheating assessment and not formal compliance advice. An overheating assessment at design stage is the only way to confirm compliance for a specific plot.
Want certainty instead of an estimate?
An overheating assessment from our experienced assessors confirms compliance plot by plot, usually within days.
Why this matters
A late Part O failure is the
expensive kind
Caught at design stage
Simple specification tweaks: louvres, glazing spec, shading, a slightly larger opening. Inexpensive, and still on paper.
Caught mid-build
Openings are formed and glazing is ordered, so the fix becomes costly bolt-on external shading or mechanical systems.
Caught at completion
Missing Building Control sign-off, which halts handover or sale until the overheating case is resolved.