- What we need from you
- Plans, sections and elevations; the MEP design or ventilation strategy; glazing and fabric specifications; the site location.
- What you get
- A report structured for the requirement it is submitted against (Part L2, Part O, planning, BREEAM or a client brief), with the model results behind it.
- How long it takes
- Fee proposal within 1 working day; we confirm the programme with the proposal.
Where Dynamic Simulation Is Used
DSM is not a single assessment. It is the method behind several different requirements, and most projects need more than one of them:
- Part L2 compliance: an approved alternative to SBEM for non-domestic buildings, producing the same BRUKL report for building control.
- Part O and CIBSE TM59: the dynamic route for overheating in new homes, care homes and student accommodation.
- CIBSE TM52: overheating in offices and other non-domestic buildings.
- BB101: overheating and ventilation in schools.
- CIBSE TM54 and BREEAM Ene 01 and Ene 02: predicted operational energy, not just the compliance figure.
- Heating and cooling loads: plant sizing from the same geometry.
One Model, Several Assessments
The geometry is the slow part of any simulation. We build it once, then reuse it for each assessment the project needs. The inputs change between them: Part L uses the fixed activity profiles and weather set by the National Calculation Methodology, while TM52 and TM59 use their own occupancy profiles and CIBSE design summer years. So each assessment is a separate run of the same model, not a copy of another one's results.
Tell us at the outset which requirements apply, and the modelling can be planned to serve all of them without duplicating work.
When DSM Rather Than SBEM?
For Part L2, SBEM is a simplified monthly calculation and is accepted for most non-domestic buildings. DSM is worth using, or necessary, when the building depends on things a monthly method represents poorly: exposed thermal mass and night cooling, mixed-mode or natural ventilation, atria, large areas of glazing, or plant and controls that SBEM cannot describe. If the same building also needs an overheating or operational energy assessment, a dynamic model is being built anyway. See SAP vs SBEM vs DSM for how the three methods compare.
Last reviewed: November 2026
