Robust thermal comfort assessments to demonstrate Part O compliance and reduce overheating risk.
Overheating in buildings is an increasingly critical issue driven by climate change, higher levels of insulation, and greater glazing ratios. For this reason, Approved Document O places a strong emphasis on early design decisions that limit unwanted heat gains while maintaining occupant comfort.
CIBSE TM52 and TM59 provide the technical framework used to assess overheating risk through Dynamic Simulation Modelling (DSM). TM52 is generally applied to non-domestic buildings, while TM59 is used for residential developments, including care homes and student accommodation.
MES Building Solutions deliver clear, proportionate TM52 and TM59 assessments that integrate seamlessly with Part O compliance, planning submissions, and design development. Our approach focuses on practical mitigation and coordinated design solutions.
Recognised Methodologies
Assessments aligned with CIBSE TM52 for non-domestic and TM59 for domestic buildings
Design-Led Advice
Clear recommendations to mitigate overheating risk through fabric, shading, ventilation, and layout
Robust Technical Analysis
Dynamic modelling using industry-standard software and weather files
Planning Ready
Reports suitable for planning submissions, technical assurance, and professional review
When TM52 & TM59 Assessments are Needed
CIBSE TM52 & TM59 are typically required where developments are at greater risk of overheating due to glazing, layout, occupancy type, or location. Compliance or planning conditions may also require robust technical analysis be carried out.
Even where designs appear to meet simplified criteria, changes in form, orientation, or specification can introduce overheating risk.
Our TM52 & TM59 Assessments Process
01
Early Risk Screening
Early identification of overheating risk and compliance strategy
02
Dynamic Thermal Modelling
TM52 & TM59 compliant dynamic thermal modelling
03
Mitigation Testing
Testing and refinement of mitigation measures
04
Reports & Support
Clear reporting with ongoing design support
What Our Assessments Cover
Our TM52 & TM59 assessments include:
Related Building Physics Services
Additional services and guidance on the topic: