What's the EPC rating?
Every certificate lodged in England and Wales is public. Look up a postcode, see each address's current rating, and open the official certificate, then read what a surveyor actually takes from an EPC, which is not the letter on the front.
Search the register free on the official service: find-energy-certificate.service.gov.uk covers every certificate in England and Wales, by postcode. Scotland's register is at scottishepcregister.org.uk.
How a surveyor reads an EPC
The construction lines beat the letter
The band is a headline; the useful rows are underneath. Wall construction, glazing, loft insulation, heating age and floor area. An EPC is one of the few public records of what a building is made of and how big it is, and it is where we look before an inspection, not after.
"Assumed" is doing heavy lifting
Where the assessor cannot see, under floors or inside cavities, the model uses era-based defaults. "Filled cavity (assumed)" is not evidence the cavity is filled, and retrofitted insulation that IS there can be wet or slumped, which an EPC will never show but a damp reading will.
Recommendations need a fabric check first
EPC recommendations are generated by software with no view on moisture. On solid-wall and older buildings, the wrong insulation in the wrong place causes the damp problems we get called to. Internal wall insulation and non-breathable renders top the list. Sequence matters: fabric first, then efficiency.
Use it in negotiation like anything else
The gap between current and potential rating has a rough, knowable cost. On a D-to-C gap that is often insulation and controls; on an F it may be a heating system. Price the works, not the letter, and let the survey tell you which works the building can actually take.
The EPC models the building. We inspect it.
An EPC assumes; a survey verifies. If the certificate shows assumed insulation, an old boiler and "very poor" floors, those are exactly the elements aRICS Level 2 Home Survey or aRICS Level 3 Building Survey looks at, as far as safe and accessible inspection allows, before the price is fixed.
Common questions
Do all houses have an EPC?
No. An EPC is required when a property is built, sold or let, and lasts ten years — so a home that has not changed hands recently may have an expired certificate or none at all. If you are buying, the seller must provide one; the register is where you check what it actually says rather than what the listing claims.
How accurate is an EPC?
It is a standardised model, not a measurement: assessors record the visible fabric and systems and software estimates the rest, assuming typical occupancy. Where insulation is hidden — as it usually is — defaults are used, so two identical houses can score differently. Treat the band as a fair comparison tool and the recommendations as a starting list, not a specification.
What does the EPC tell me that matters for a survey?
The useful lines are construction and heating: wall type (solid or cavity, and whether filled), glazing, loft insulation, main heating and its age, and the floor area — a rare public record of size. A survey then tests what the EPC assumed: whether the cavity insulation is actually there and dry, whether the "very poor" floor note is a suspended timber floor with blocked vents, and what the fabric can safely take.
Is a bad EPC a reason not to buy?
Usually it is a negotiating and budgeting fact rather than a red flag: an E-rated solid-wall terrace is normal for its era, and the jump to a C has a knowable cost. The caution runs the other way for landlords, where minimum-standard rules apply, and for anyone relying on green mortgage products with band conditions.