Commercial EPC for a multi-let building: whole property or individual unit?
Work out the assessment boundary before marketing an office floor, retail unit or mixed-use building.
Start with the space in the transaction
An office floor offered to one tenant, a retail unit beneath flats and an entire block being sold are different instructions. Before requesting a commercial Energy Performance Certificate, identify exactly what is being marketed and draw its boundary on a plan. The address alone may not distinguish a separately occupied unit from the building around it. Record which areas are included in the lease or sale, which are shared and whether there are residential parts. A domestic flat normally needs its own domestic EPC; the non-domestic assessment should not quietly absorb it.
Shared services can change the answer
The government guide to non-domestic EPCs gives examples for blocks with common and independent heating systems. In a building with common heating, a whole-building EPC may be suitable for marketing parts of the building, although an individual part can also be assessed where required. Where parts have independent systems, the options differ. Communal areas and separately assessed dwellings need particular care. There is no reliable rule that every tenancy needs its own EPC or that one certificate always covers every unit. Ask an accredited non-domestic energy assessor to confirm the appropriate boundary against the actual building and transaction.
Prepare the information that resolves the scope
Provide a marked lease or sale plan, approximate floor areas, current use of each space and access to plant rooms. Explain whether heating, cooling, ventilation, hot water and lighting are central or controlled by individual occupiers. If a shop has a rear store, mezzanine or office, show how those areas relate to the unit. List any vacant space and whether the landlord can provide plant specifications. These details help the assessor decide what to survey and quote, especially where the property has multiple entrances or addresses. Our commercial EPC service uses floor area and building information to start that conversation.
Verify the document before advertising
Search the official energy certificate register for the building and its units. Check the property description, floor area and certificate date, not just the letter rating. A valid EPC for a different boundary is not automatically suitable for the space now being let. Once the correct certificate is established, check the separate private-rented-property energy rules relevant to the proposed letting. Our commercial EPC and MEES checklist covers that next step.
Ask for the deliverable you actually need
A non-domestic EPC for a sale or letting is a different output from design-stage energy modelling for building regulations. If a unit is being newly created or substantially altered, tell the assessor or design team about that work rather than assuming an existing certificate will answer every question. The service directory explains the separate modelling route. Getting the boundary and purpose clear at the outset makes the certificate more useful to the buyer, tenant and property team.