Residential vs Commercial EPCs

What is a residential EPC?

A domestic EPC is used for a dwelling, such as a house or a self-contained flat. Existing homes and newly constructed dwellings can require different assessment routes, so tell the provider whether the building is already occupied, newly built or being converted.

The current domestic headline energy-efficiency rating is linked to modelled running costs under standard assumptions. It does not use the occupier's actual bills as a direct measure of performance. The certificate also includes information about features and potential improvements.

What is a commercial EPC?

A non-domestic EPC covers relevant buildings or units used for purposes other than dwellings, including many shops and offices. Its assessment can consider different activity zones and building services, including heating, cooling, ventilation and lighting.

The headline non-domestic rating is based on modelled carbon emissions. That differs from the domestic cost-based headline measure, so a numerical score for an office should not be interpreted as the same calculation as a score for a house.

Mixed-use premises need clear boundaries

Consider a shop with a self-contained flat above. The residential and business accommodation may require separate certificates. Explain which part is being marketed and how it is accessed and serviced before requesting a quote.

Likewise, one certificate for a building does not necessarily describe every independently used unit within it. Lease arrangements, separate accommodation and shared services need to be understood. Send a plan where available and identify the unit or units involved in the transaction.

Converted homes and business use

The fact that someone works from home does not automatically make the entire house a commercial building. Equally, accommodation converted to a different use should not be assessed solely from an old domestic address description. Explain the actual arrangement and seek a property-specific assessment of scope.

For conversions creating new dwellings, building-regulations requirements and the appropriate on-construction route may be relevant. Read new-build EPCs before assuming a routine existing-home visit is sufficient.

Minimum letting standards are also separate

Domestic and non-domestic rented properties have different MEES regimes. Both current official guides describe a minimum E standard for covered properties, subject to exemptions, but scope and improvement rules differ.

Do not transfer the domestic cost cap into a commercial compliance calculation. A building owner with both houses and business premises needs to keep the two regimes distinct. Our minimum-rating guide introduces these differences.

Information to provide when booking

• The full address and exact flat or unit being assessed.
• The current and intended use of each part.
• Approximate floor area and available plans.
• Whether systems are individual or shared.
• Whether the building is existing, newly built or converted.

EPC Agent offers enquiries for residential and commercial services. See EPC services in Oldbury for local property context, or contact us if the building's classification is unclear.

Frequently asked questions

Is a commercial EPC just a more expensive residential one?

No. The assessment method and building information differ. Pricing should reflect the actual scope rather than a simple change of label.

Does a flat above a shop need a commercial EPC?

A self-contained dwelling is not automatically commercial because a shop is underneath it. Establish the separate accommodation and correct certificate scope.

Can one assessor do every type of building?

Accreditation and competence must match the assessment required. Describe the property accurately so the correct route can be arranged.

Is a Display Energy Certificate the same as an EPC?

No. DECs have a different purpose and requirements for certain public buildings. Do not order one as a substitute for the EPC needed for a sale or letting.