BREEAM Assessments — Energy & Thermal Comfort Modelling

Walker Energy Analysis provides IES-modelled BREEAM assessments for UK construction projects, covering the credits that depend on energy and thermal comfort modelling: ENE01, ENE04, HEA01 and HEA04. We build the modelling evidence your BREEAM assessor needs for each credit, matched to the design stage you’re at.

BREEAM credits in this category aren’t won with a general statement of intent; the assessor needs modelled evidence. A weak or late submission here can cost credits that were otherwise achievable, and clawing them back after the design is fixed is far harder than getting the model right the first time.

The Credits We Cover

ENE01 – Reduction of Energy Use and Carbon Emissions. This credit has two distinct strands. The regulated energy metrics are assessed from the BRUKL output of your Part L compliance model, comparing predicted energy consumption and CO2 emissions against the notional building. Separately, up to four credits are available for Prediction of Operational Energy Consumption, assessed using the CIBSE TM54 methodology — a different piece of modelling, looking at how the building is likely to perform in use rather than just its regulated compliance position.

ENE04 – Low Carbon Design. Split between a passive design analysis and a low/zero carbon feasibility study. The passive design element is directly linked to the HEA04 thermal modelling below, so evidence from that assessment carries across.

HEA01 – Visual Comfort. We carry out the daylighting assessment for this credit, calculating daylight factors across the relevant spaces to demonstrate the design meets BREEAM’s daylighting criteria.

HEA04 – Thermal Comfort. Dynamic thermal modelling of the proposed building, following CIBSE methodology (TM52 or TM59 depending on building type), to demonstrate the design achieves adequate thermal comfort without relying on mechanical cooling alone. 

  • BRUKL-based regulated energy and carbon assessment for ENE01
  • CIBSE TM54 operational energy prediction for ENE01’s exemplary credits
  • Passive design analysis and LZC feasibility study for ENE04
  • CIBSE-methodology thermal modelling for HEA04, and daylight assessment for HEA01
  • Assessor-ready evidence for each credit, cross-referenced where they share a common basis

Why M&E Teams Work With Us

We’re a specialist energy consultancy – this is the core of what we do, not a sideline. Every assessment runs through IES VE as standard, we turn changes around quickly, and results come back in a format your team and BREEAM assessor can use immediately.

FAQs

Q: Is the TM54 assessment the same as the BRUKL-based part of ENE01?
A: No — they’re separate strands of the same credit. The BRUKL-based metrics assess regulated energy against the notional building; the TM54 assessment predicts operational energy consumption and can add up to four further credits.

Q: Do you need our BRUKL report to assess ENE01?
A: We can produce the Part L2 BRUKL report and the ENE01 assessment together as one piece of work.

Q: What thermal modelling methodology do you use for HEA04?
A: CIBSE TM52 or TM59, depending on building type, in line with the BREEAM technical manual’s requirements for thermal comfort modelling.

Q: At what stage should this work start?
A: As early as possible — ideally by RIBA Stage 2, particularly for the ENE04 low/zero carbon feasibility study, which BREEAM requires to be completed by the end of Concept Design.

Talk to Walker Energy Analysis early, and get your ENE01, ENE04, HEA01 and HEA04 evidence built to support each other.