TM59 Overheating Risk Estimator
Check Part O compliance in minutes using industry-standard DSY1 weather data for 17+ UK locations.
Free Overheating Calculator
Instant assessment in your browser based on the TM59 methodology. No software installation, no complex modelling required.
Browser-basedZero Logic Required
Simplified input process handles all complex thermal logic automatically. Just enter your room details and dimensions.
SimplifiedInstant Results
Get immediate pass/fail feedback against Criterion A and B without waiting for consultants or running long simulations.
Real-timeBuilding Regs Part O
Quickly check if your designs are likely to comply with the new Part O overheating regulations before committing.
ComplianceAutomated Reporting
Generates clear, actionable breakdowns of which rooms pass or fail, helping you optimize designs faster.
ActionableLondon & UK Weather Data
Pre-loaded with standard DSY1 weather files for major UK cities, accounting for local climate and heat island effects.
17+ Locations