A commercial EPC is a legal requirement for many business premises in the UK – but it can only be produced by a qualified commercial energy assessor. Whether you’re a property owner, manager or developer, understanding what that role actually involves helps explain why the certificate looks the way it does, and what you can reasonably expect from the process.
In this blog, you’ll learn:
- Who commercial energy assessors are and what their role entails
- The core responsibilities of a commercial energy assessor
- Why EPC assessments matter for commercial buildings
- What sets our assessors apart
Who is a Commercial Energy Assessor?
A commercial energy assessor is a qualified professional responsible for evaluating the energy efficiency of non-domestic buildings. Most importantly, they hold a Non-Domestic Energy Assessor (NDEA) qualification – the accreditation that legally allows them to assess commercial buildings and lodge valid Non-Domestic EPCs to the relevant EPC Registers in the UK. Without it, an EPC simply can’t be issued, regardless of how the assessment itself was carried out.
Through detailed inspections, an NDEA analyses how a building consumes energy and issues an Energy Performance Certificate (EPC), rating the property’s efficiency from A (most efficient) to G (least efficient).
Unlike domestic EPCs, which are based on running cost, commercial EPCs are calculated based on carbon emissions – giving a more accurate reflection of a building’s environmental impact. Commercial energy assessors work to strict guidelines, standards and certifications, ensuring assessments are accurate and consistent enough to meet legal requirements.
What Does a Commercial Energy Assessor Do?
A Commercial energy assessor uses detailed knowledge of non-domestic construction techniques and services, to generate an accurate EPC score that informs building owners and tenants about the energy efficiency and carbon emissions of their buildings. This can then be used as a first step to benchmark the building against future improvements while meeting minimum energy efficiency standards.
— Richard Millard, Lead Sustainability Consultant at Building Energy Experts
Here’s a breakdown of the core tasks involved:
- On-Site Inspections. Assessors conduct a comprehensive on-site inspection to evaluate structural elements like insulation, heating, ventilation, lighting and air conditioning systems – all of which significantly impact a building’s energy consumption and efficiency.
- Collecting and Analysing Data. Assessors gather detailed data on the property’s energy systems and identify where energy is being lost, such as through heat leaks around windows or poorly insulated walls.
- Calculating an Energy Performance Rating. Using the data collected, assessors calculate the building’s energy rating based on carbon emissions using SBEM software. This generates a model of the building, simulating its energy performance to produce an accurate EPC.
- Providing Recommendations for Improvement. Assessors offer tailored recommendations for enhancing energy efficiency – upgrading insulation, replacing outdated lighting, or optimising heating and cooling setups – helping businesses save on energy costs, improve their rating, and meet MEES compliance requirements.
Why EPC Assessments Matter
Compliance with EPC standards offers more than regulatory assurance – it supports:
- Cost Optimisation: Improved energy efficiency reduces operational costs.
- Marketability: Energy-efficient buildings are more attractive to tenants or buyers.
- Sustainability: Meeting EPC standards supports Net Zero goals.
With MEES thresholds tightening, commercial properties need to meet minimum efficiency standards to remain compliant, or risk fines and restrictions on leasing.
What Sets Our Commercial Energy Assessors Apart
Advanced thermographic imaging and air tightness testing aren’t part of a standard assessment – not every building needs them. Instead, our assessors look at the existing EPC and the building’s specific details first, and recommend testing as an add-on only where it’s likely to make a genuine difference to the outcome.
Including air tightness test results in a commercial EPC assessment can meaningfully improve a building’s rating where it applies – see how it worked for two Bristol warehouses:
Two Bristol warehouse operators discovered SBEM’s default air permeability assumption was holding their ratings back – with very different results once tested.
What’s Next?
Whether you’re marketing a building, renewing a lease, or just want a clearer picture of where your rating stands, the right assessment starts with the right assessor.
We carry out Commercial EPC assessments, with optional advanced testing to improve the accuracy of your results.