TM59 OVERHEATING EXPERTS
Helping architects and developers meet TM59 and Part O compliance with confidence.
Why TM59 Compliance Matters
Overheating is one of the biggest challenges facing new homes in the UK. CIBSE TM59 is the standard that ensures developments are safe, comfortable, and future-proof.
Ignoring it can mean:
❌ Planning refusals and costly project delays
❌ Expensive retrofits late in the build process
❌ Health risks for residents, from heat stress to poor sleep
❌ Reputation damage from non-compliant homes
Getting it right early brings major benefits:
✅ Smooth planning approval with no last-minute surprises
✅ Protected budgets and timelines by avoiding redesigns
✅ Safe, comfortable homes that meet resident needs
✅ Future-proof developments designed for a warming climate
Did you know?
Over 60% of new London homes risk failing TM59 overheating compliance without mitigation.
Our Proven Approach to TM59 Assessments
We don't just test — we help you design with confidence. Our team combines technical rigour with practical, design-led advice to make compliance simple.
Our 3-step process:
Dynamic Modelling
We run advanced simulations to test overheating risk under realistic conditions, using CIBSE-approved weather files.
Clear Reporting
Results are presented in plain language, so you know exactly where you stand and what needs to change.
Smart Mitigation
We recommend practical, cost-effective measures — helping you pass TM59 without over-engineering or compromising your design intent.
The outcome?
Confidence that your development is compliant, comfortable, and ready for planning approval.
Avoid risks, design with confidence
Risks of non-compliance
🚫 Planning refusal or costly project delays
🚫 Expensive retrofits at later stages
🚫 Increased complaints or reputational damage
🚫 Uncomfortable, unhealthy living environments
Mitigation strategies we advise on:
Smarter orientation and layout
Optimised glazing and shading
Natural ventilation & MVHR
Passive cooling design principles
Case Studies
Proven results across UK housing
Urban housing scheme
Catchy subtitle
Passed TM59 by combining orientation adjustments with external shading—saving the client costly redesign.
Mixed-use development
Catchy subtitle
MVHR and ventilation strategy cut overheating risk by 30% and gained smooth planning approval.
Urban housing scheme
Catchy subtitle
Passed TM59 by combining orientation adjustments with external shading—saving the client costly redesign.
The people behind TM59 Experts
Our team has delivered overheating assessments for projects across the UK, from small residential blocks to large masterplans. We combine technical rigour with clear communication—so you get results you can trust.
Martin Davis
Senior Sustainability Consultant
Specialist in TM59 modelling and dynamic thermal analysis, Sarah has delivered overheating assessments for residential and mixed-use developments across the UK.
Patricia Watson
Environmental Consultant
Emily focuses on practical, design-led mitigation strategies to ensure every project meets overheating and sustainability goals without overengineering.
Hundreds of satisfied clients
