About us

Explore our commitment to thermal dynamic innovation

Our consultancy is dedicated to advancing sustainable building design through expert thermal dynamic modelling, focusing on compliance with TM59 and Part O regulations.

What we are for

We aim to empower architects, developers, and construction professionals with accurate analysis and simulation to optimise building performance and energy efficiency.

Overheating compliance arrived quickly and caught a lot of the industry out. Plenty of schemes now reach building control with an assessment that says the right words but cannot be followed, or that fails without explaining why — and the cost of that lands on the developer, in weeks.

O-Reg Thermal exists to be the other kind of consultant: one who tells you where the problem is while it is still a line on a drawing.

Building under construction
“O Reg Thermal provided unparalleled expertise in thermal dynamic modelling, ensuring our project met all TM59 and Part O compliance with ease.”
Harriet JonesSenior Architectural Consultant

How we work

Standards, not shortcuts

Modelled to CIBSE TM59 and Approved Document O, with the assumptions stated in the report so anyone checking can follow the work rather than take it on trust.

Written to be read

One document that a building control officer, a planner and a client can each get what they need from, without a covering note explaining it.

A date that holds

You are told when the report will land before the work begins, and it lands then. Most of the cost of compliance is the waiting.

Tell us about the scheme

Send the drawings and a short description and you will have a price, and a realistic date for the report, the same working day.