SBEM calculations

SBEM calculations are required for compliance with Part L2 of the Building Regulations. Whether you're constructing, refurbishing, or extending a commercial building, your local authority will ask for SBEM reports as part of the building control process.

At Darren Evans, our Level 5 SBEM consultants offer expert support to help you meet the standard efficiently and confidently. We’re here to simplify the process and ensure your project progresses smoothly wherever you are in the UK.

How We Support You

We offer practical, end-to-end SBEM consultancy. Whether you’re in early-stage design or preparing for submission, we help you:

Explore efficient options — We model fabric, lighting, and HVAC variations to identify the best-performing and most cost-effective solutions.
Run your full SBEM calculation — Provide the details, and we’ll model the results, assess compliance, and issue your report.
Resolve non-compliance — If your design doesn’t meet Part L2, we’ll recommend changes to help you pass.
Fill in the gaps — Missing data? We’ll help complete what's needed.

Top tips

Start with your M&E strategy.
In commercial buildings, mechanical and electrical systems often have a bigger impact than insulation. Choose wisely, and early.
Don’t overlook lighting
For offices and retail, lighting design can heavily affect your calculation. Efficient fixtures can tip the balance in your favour.
Plan for hot water demand
Buildings like gyms, hotels and sports facilities often fall short due to overlooked hot water loads. We help you choose the right system to reduce energy use and emissions.

Watch out for:

Key Differences to Be Aware Of

SBEM assessments differ for new and existing buildings. For new builds, we can model directly from architectural drawings. For existing buildings, a site visit is required before issuing an EPC — so we include this in every consultation quote.

Our team is qualified to CIBSE Level 5 and can run Dynamic Simulation Models where required — such as for complex ventilation systems, atriums or automated blinds.

Get in touch

Next steps

Why Darren Evans?

As a trusted SBEM consultancy, we bring years of experience in energy modelling, compliance and building performance. Our clients across the UK value our speed, clarity and collaborative approach.

We don’t just deliver reports, we give you clarity and confidence, with expert guidance that fits the realities of your project.

We're proud to be affiliated with other leaders in sustainability: