Stay Ahead of Overheating Compliance with EDSL TAS: Your Solution for TM59 Assessments

As the UK climate continues to warm and building regulations evolve to meet higher standards of occupant comfort, overheating risk assessments are becoming a critical component of sustainable building design. CIBSE TM59, the industry-recognised methodology for evaluating overheating in homes, is now a key compliance target for residential projects. EDSL Tas is a powerful dynamic simulation tool that makes TM59 assessments accurate, efficient, and fully compliant.

Multi Resi Scheme
Individual Dwellings

Why TM59 Matters

CIBSE’s TM59 guidance sets clear performance criteria for assessing whether a dwelling is likely to overheat based on hourly temperature simulations. With growing pressure from Part O of the Building Regulations, developers and consultants need to demonstrate overheating compliance right from the design phase — or risk costly redesigns and delayed approvals.

Whether you’re working on single-family homes or large multi-residential schemes, TM59 ensures that your designs maintain healthy indoor temperatures during future climate scenarios. But to assess TM59 correctly, you need more than basic thermal models — you need precise, building-specific simulations. That’s where Tas excels.

Tas: Built for Precision and Speed

Tas is a dynamic thermal simulation software trusted by engineers, architects, and sustainability experts across the UK. Its comprehensive capabilities make it ideally suited for TM59 assessments, offering:

 

  • High-Resolution Thermal Modelling: With full hourly analysis over an entire year, Tas enables detailed tracking of internal conditions, including gains from solar, occupancy, and equipment.
  • Customisable Occupancy & Ventilation Profiles: Define room-specific usage patterns, window openings, purge ventilation strategies, and shading — all critical inputs for TM59 compliance.
  • Approved Weather Files & Climate Scenarios: Use CIBSE-approved DSY1, DSY2, and DSY3 weather files to reflect current and future climate risks.
  • Seamless Reporting: EDSL Tas provides clear outputs directly aligned with TM59 criteria, including frequency of exceedance hours and weighted adaptive comfort thresholds.

Efficiency Without Compromise

The intuitive 3D modeller in Tas lets you build complex geometries quickly or import from BIM tools, cutting down on modelling time without sacrificing accuracy. Plus, with batch simulation capabilities, Tas is ideal for larger schemes where hundreds of units must be tested under consistent criteria.

And with the new emphasis on Part O (Overheating) in England’s Building Regulations, using a tool like Tas streamlines compliance by bridging the gap between regulatory frameworks and detailed simulation.

Trusted by Industry Leaders

From bespoke residential designers to major developers and M&E consultancies, Tas is the go-to software for performance-led modelling. With a growing need for heat-resilient homes, Tas ensures you’re delivering not just compliance — but comfort, wellbeing, and futureproofed design.

Ready to future-proof your projects?
Get in touch with EDSL Consultancy today (consultancy@edsl.net) or download a trial of Tas (www.edsl.net) to see how easily you can integrate TM59 assessments into your workflow.