Commercial EPC from £95

A commercial EPC rates a non-domestic building's energy performance from A to G, produced using the Simplified Building Energy Model (SBEM) rather than the RdSAP methodology used for homes. Under the Energy Performance of Buildings (England and Wales) Regulations 2012, a valid commercial EPC is required whenever a non-domestic building or unit is sold, let, or constructed, and it must be made available to a prospective buyer or tenant. It applies to a single shop unit just as much as a multi-storey office building, and estate and commercial agents will generally not market a property without one already commissioned.

The duty sits with whoever is selling, letting or constructing the building, and applies across almost every type of non-domestic use.

Commercial buildings vary enormously in construction, use and building services, so the SBEM methodology models the building zone by zone rather than treating it as a single uniform space. A retail unit with a simple gas heater is a very different modelling exercise from a multi-let office with air conditioning, mechanical ventilation and a building management system, and the assessment reflects each zone's actual activity, heating, cooling, ventilation and lighting rather than a single blended assumption for the whole building.

The site visit records the building's construction, glazing, and the specification of its heating, cooling, ventilation and lighting systems, zone by zone where the building has more than one distinct use or area.

Pricing starts at £95 for a small, simple unit assessed by a Level 3 assessor, and increases with floor area, the number of distinct zones, and the complexity of the building's services. A single shop with a simple heater is quicker and cheaper to assess than a multi-storey office with air conditioning and several tenants, since the latter needs a Level 4 or Level 5 assessor and a more detailed zoned model. We confirm the exact price once we know the building's use, size and system complexity.

Most straightforward commercial units can be surveyed within a few working days of enquiry, and the survey itself typically takes between thirty minutes for a small shop and several hours for a larger, more complex building. Once the data is collected, the SBEM model is built and checked before the certificate is lodged on the register, usually within a few working days of the site visit for a straightforward building, and longer for a large or heavily zoned one.

Ageing air conditioning and lighting without controls are the most frequent drag on a commercial rating, since these systems account for a larger share of a non-domestic building's energy use than fabric alone. Buildings that have changed use since they were last certified — a warehouse converted to office space, for example — often carry an EPC that no longer reflects the building's actual systems, and a new assessment usually shows a materially different result once the current specification is properly recorded.

The Minimum Energy Efficiency Standard for non-domestic property sets a minimum EPC rating of E for most new lettings and renewals, subject to exemptions, with enforcement by local trading standards authorities. Lease events — a new letting, a renewal, sometimes a rent review — are the practical moments this becomes a live issue, so checking a commercial EPC's rating and expiry ahead of any planned lease transaction avoids a compliance problem surfacing mid-negotiation.

Have manufacturer data or commissioning certificates for heating, cooling and ventilation systems available if you have them, along with any lighting specification showing controls such as daylight or occupancy sensing. Access to plant rooms, risers and any locked areas housing building services on the day speeds up the visit and improves the accuracy of the final rating.

We match the assessor level to your building's actual complexity rather than defaulting to whichever assessor is available, model each zone according to its real use, and confirm pricing before booking. Coverage spans London, Hertfordshire, Middlesex and Berkshire, and if you also need fire risk assessment for the same building, our sister company Fire Risk Specialists covers that separately.

Non-domestic energy assessors are qualified at three levels, and the correct level depends on the building's complexity rather than simply its size. Level 3 covers straightforward buildings with simple heating and no air conditioning, such as small shops or warehouses. Level 4 extends to buildings with air conditioning systems up to a specified cooling capacity, covering most typical offices and retail units. Level 5 is required for the most complex buildings, including large or high-rise premises, those with combined heat and power, complex mechanical ventilation, or unusual construction that falls outside the standard categories the software can model directly. Using an assessor qualified below the level a building actually requires produces an EPC that is not valid, so the first step on any commercial instruction is establishing which category the building falls into before a survey is booked.

The Minimum Energy Efficiency Standard for non-domestic property sets a minimum of EPC E for most new lettings and lease renewals, subject to exemptions similar in principle to the domestic regime, and enforcement sits with local trading standards authorities. The practical trigger points landlords need to plan around are lease events: granting a new lease, renewing an existing one, and in some cases a rent review, since these are the moments an out-of-date or non-compliant certificate becomes a live problem rather than a background risk. Commercial leases often run for many years, so a certificate that was valid at the start of a term can expire or become out of date well before the next lease event, and checking EPC status ahead of any planned lease transaction avoids a compliance issue surfacing during negotiations with a prospective tenant.

Commercial EPCs are more sensitive than domestic ones to heating, ventilation, air conditioning and lighting specification, because these systems typically account for a larger share of a non-domestic building's energy use than fabric alone. Manufacturer data for chillers, air handling units and boilers, commissioning certificates, and details of any building management system controls can each refine the assessment beyond a conservative default. Lighting evidence matters particularly where a building has been upgraded to LED fittings with occupancy or daylight sensing, since this can represent a significant improvement over the fluorescent or halogen defaults the software otherwise assumes. Providing this paperwork ahead of the survey, or making it available during the site visit, is the single most effective way a commercial client can influence the accuracy of the resulting rating.

A multi-let building can be assessed as a single whole-building EPC, or as separate assessments for each demise, and the right approach depends on how the building is let and managed. Where units share central plant serving the whole building, a single assessment usually reflects reality more accurately and avoids double-counting shared systems across several separate certificates. Where each unit has its own independent heating, cooling and metering, individual unit-level assessments are usually more appropriate and more useful to prospective tenants comparing units. We agree the right structure with the landlord or managing agent before survey, since retrofitting the wrong structure after assessments have been carried out means resurveying rather than simply reformatting the paperwork.

A commercial EPC comes with a recommendations report setting out measures that could improve the rating, ranked broadly by payback. In practice, landlords use this most actively at two points: ahead of a refurbishment, where fabric or plant measures can be bundled into works already planned rather than carried out separately at a premium, and ahead of marketing a unit to let, where a stronger rating can be a genuine differentiator to tenants increasingly asking about running costs and ESG credentials as part of their own reporting. We flag which recommended measures are realistic within a typical refurbishment budget and which are only worth pursuing at end of plant life, rather than presenting every listed measure as equally urgent.