| Commercial unit | Residential units | |
|---|---|---|
| Regime | Non-domestic MEES | Domestic MEES |
| Minimum now | E | E |
| Next standard | B by 2031 if over 1,000 m² | Under review |
| Cost test for exemption | 7-year payback | £3,500 cost cap |
| Maximum penalty | £150,000 (20% of rateable value) | £5,000 per breach |
| Assessment method | SBEM / iSBEM / DSM | RdSAP |
Why this catches people
Mixed-use stock is typically held by owners who think of themselves as commercial landlords. The shop is the asset; the flats above are ancillary, often let on ASTs through a different agent, sometimes barely thought about between tenancies. The commercial EPC gets attention at rent review and the residential ones get none.
The domestic regime is the tighter one in practice: the £3,500 cost cap is far less generous than the seven-year payback test, and domestic F and G stock is common in exactly this kind of building – upper floors over a shop, solid walled, single glazed, electric heating.
Apportionment and the 1,000 m² threshold
The 2031 threshold is measured on the non-domestic part. A building whose gross area exceeds 1,000 m² but whose commercial demise is 400 m² is not brought into the 2031 standard by the flats above it. Get the certificate's recorded floor area right before drawing conclusions – it is on the certificate.
Service charge across two regimes
Works to shared elements – the roof, the envelope, a common plant room – benefit both halves and are recoverable under two different sets of lease terms, one commercial and one residential, with the residential side subject to statutory consultation. This is the single most common reason mixed-use upgrade work stalls. See service charge and dilapidations.
Find the certificate you already have
Search the Energy Performance of Buildings Register for your building. It is free, there is no sign-up, and it takes about ten seconds.
Common questions
Which MEES rules apply to a shop with flats above?
Both. The commercial unit is assessed under the non-domestic regime and the flats under the domestic one. They have different standards, different exemption grounds and different penalties.
Do I need separate EPCs?
Generally yes – separately let units with their own services need their own certificates. A single certificate covering the whole building is unusual and frequently the source of the confusion.
Which penalty regime applies?
Each unit attracts the penalty regime for its own type. Non-domestic penalties run on rateable value to £150,000; domestic penalties are capped far lower.