What Ene 01 Measures in New Construction Assessments

Under BREEAM UK New Construction, the Ene 01 category evaluates how efficiently a building is expected to operate once complete. The assessment relies on Part L modelling tools such as SBEM or BRUKL to quantify predicted energy use and carbon emissions.

The number of Ene 01 credits awarded depends on the calculated improvements in:

building fabric performance
heating and cooling efficiency
distribution losses and system controls
overall regulated energy consumption

This makes Ene 01 one of the most influential categories within a BREEAM score.

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Why Energy Modelling Drives Credit Outcomes

To demonstrate improvements in the BRUKL or SBEM file, designers must present realistic efficiency gains rather than theoretical assumptions. For HVAC systems, this means showing how the design reduces loads, improves temperature differentials (ΔT) and minimises distribution losses.

Hydronic modelling is increasingly used to:

validate whether proposed ΔT values are achievable
calculate realistic pump energy savings
estimate load reductions from improved control
demonstrate the impact of optimised distribution systems

Learn how modelling provides defensible performance evidence ›

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The Role of Detailed HVAC Simulation in Achieving Higher Scores

Because BREEAM relies on predicted energy performance, every modelling input affects the final credit tally. Simulation helps avoid conservative assumptions that may undervalue the efficiency of well-designed systems.

Engineers use system models to understand:

the actual distribution temperatures achievable
diversity and load-sharing between heat sources
part-load behaviour of pumps and chillers
how system choices influence the Part L outputs

Modelling does not replace the SBEM or BRUKL file — it strengthens it by supplying accurate inputs.

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What This Means for Project Teams

Achieving higher Ene 01 scores depends on design decisions backed by verifiable data. By combining building-level energy assessments with detailed hydronic modelling, project teams can demonstrate measurable improvements and create a stronger case for credit allocation.

Explore how data-driven design supports stronger BREEAM outcomes ›

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FAQ: BREEAM Ene 01 Energy Credits

Does Ene 01 Only Consider HVAC Performance?

No. HVAC plays a major role, but Ene 01 also evaluates fabric efficiency, renewables, air tightness and overall regulatory energy use.

Can Hydronic Modelling Replace SBEM or BRUKL?

No. SBEM and BRUKL are still mandatory for compliance. Hydronic modelling is used to produce accurate HVAC inputs that feed into these tools.

Are Higher Ene 01 Scores Achievable Without System Optimisation?

It is possible, but difficult. Most projects rely on distribution optimisation, realistic ΔT improvements and efficient plant selection to increase their credit potential.

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