A seller's EPC is a public document they paid for but did not curate for you. It grades the walls, roof, windows and heating, puts indicative costs against the improvements it recommends, gives a floor area you can price per square metre, and dates the assessment.
Almost everything you see before making an offer was prepared for you. The photographs are chosen, the floorplan flatters, the description is written by someone the seller pays. The Energy Performance Certificate is not. An accredited assessor produced it to a fixed method, and it says what it says whether or not that helps the sale.
This guide covers domestic certificates in England and Wales. Scotland and Northern Ireland keep separate registers under their own rules.
The one document in the sale the seller did not curate
A home marketed for sale in England and Wales must have an EPC. The seller commissions and pays for it, an accredited domestic energy assessor produces it, and once lodged it sits on the public register, valid for ten years from lodgement.
That ownership is what makes it useful later: anything you raise from it comes from the seller's own document rather than your guess about their house. What is an EPC covers the document itself; to read a specific property's, the free EPC checker pulls it off the register in about thirty seconds, with no account, and the seller is not notified.
Read it before the second viewing, not after the offer. What you take from it is not a verdict on the house — it is a list of specific things you now know to ask about, and each section below is one of them.
Been to a viewing?
Put in the address and see what the data says you should offer — sold prices, time on market, seller signals.
The element conditions are the detail the band leaves out
Under the headline band, the certificate describes the building element by element — walls, roof, windows, main heating and its controls, hot water and lighting — grading each on a five-step scale: Very Poor, Poor, Average, Good, Very Good.
This is the page buyers skip, and the most useful one. The band alone tells you little: band D is the most common band in England and Wales and spans fourteen points, so two Ds can be quite different buildings (see EPC rating D). "Walls: solid brick, as built, no insulation — Very Poor" tells you what you are buying.
Read the descriptions, not just the grades: "cavity wall, filled" and "cavity wall, as built, no insulation" are two different houses. And watch for the word assumed — where the assessor could not inspect something or was not shown evidence, the standard method records an assumption. That is a question, not a finding, and it may understate the house as easily as overstate it.
None of this is a survey, and it replaces none of one. The assessor measures the building against a fixed energy model rather than inspecting it for defects: an EPC will not find damp, movement or a failing roof. Get a survey anyway.
The recommendations are a snagging list with prices attached
Every certificate ends with recommended measures, each carrying an indicative cost range, a typical annual saving and the score the property would reach if the work were done — a schedule of energy work, listed and costed by the seller's own assessor.
Those figures are model outputs at stated rates for a standardised household, priced at the energy rates of the certificate's own year, so one lodged nine years ago quotes nine-year-old money. (Broc re-prices that same modelled energy use at rates stated as of early 2026, and says which figure is which.) They are generated the same way for every property assessed under the same method, so two certificates of similar age are comparable — though the method itself has been revised more than once in the last ten years, which is why a 2017 certificate and a 2025 one are not strictly like for like. They are not a builder's quote, and not a forecast of your bills.
What they give you is a case worth arguing, and it is worth being precise about that. A certificate does not entitle you to a discount and does not set one. It gives you an unaggressive way to put a figure in the room: it rates the walls Very Poor, puts an indicative range against insulating them, and that work sits ahead of whoever buys the house. Get a written quote for the largest item if you can — that is what turns an indicative range into a figure. Whether the price moves is a negotiation.
The floor area lets you check the price, not just the property
The certificate records a total floor area in square metres, measured to a standard method. Listings often omit floor area, and where they give one it may be measured differently or rounded up.
Divide the asking price by that figure and you have a £ per square metre to hold against the same sum for nearby sold comparables. It settles nothing on its own — it knows nothing about condition or layout, and it only holds where the comparable's floor area was measured the same way — but it gives you a rough sense of whether the property is priced near its street, and a question to ask if it is not.
The assessment date tells you what has happened since
Because a certificate lasts ten years, the one on the register may describe the house as it stood nine years ago, which cuts both ways.
An old, poor certificate may under-rate a home that has quietly been improved — new boiler, replacement windows, loft done. The seller has an argument they have not made and should be able to evidence it. An old, good one proves less than it appears to: a boiler graded "Good" in 2017 is a nine-year-old boiler now. How to check a property's EPC covers lookups, expired records and blank results.
Still working out your number?
One practical guide a week — starting with how far below asking you can actually go.
By signing up you agree to our privacy policy. We capture which guide referred you and note when our emails are opened, so we know what's worth writing. Unsubscribe any time.
The transaction type hints at who you are buying from
The register also records why the assessment was commissioned: marketed sale, non-marketed sale, rental (private), rental (social), new dwelling, re-mortgaging, and a few others.
If the certificate on a house now for sale was lodged for a private rental, the home has been let at some point, and there is a reasonable chance the seller is a landlord rather than a family moving on — which raises questions you might not otherwise ask, about who is living there, vacant possession, and how the seller thinks about timing.
Hold it loosely: it is one field, it may be years old, and it describes what the assessment was for, not who owns the house today.
Turn each finding into a question
Write these down before you speak to the agent, and keep every one neutral and answerable. An agent who feels accused stops being a source.
- Walls Poor or Very Poor: "Was insulation ever quoted for the walls, and what stopped it going ahead?"
- Anything marked assumed: "The certificate assumes the loft insulation — has anyone measured it?"
- A few years old: "Has the boiler been replaced since the assessment? Could I see the installation date and service history?"
- Most of a decade old: "Has a newer EPC been commissioned?"
- Solar panels recorded: "Are the panels owned outright, or under a roof-lease agreement?"
- A flat or maisonette: "Who is responsible for the recommended works — the leaseholder or the freeholder?"
- Always: "Would the seller share the last twelve months of energy bills?" Real bills beat every model, theirs and ours.
Where the rules stand (position as of August 2026)
A low band means something different to a landlord seller than to an owner-occupier.
- Privately rented homes in England and Wales must already meet band E, unless a valid exemption is registered for that property. That minimum has been in force since April 2020.
- The rental minimum rises to band C — or its equivalent under the new metrics — on 1 October 2030. That is confirmed, with one genuine caveat: what counts as equivalent under the new metrics is still completing its Parliamentary passage.
- Certificates themselves are changing. New-style certificates using four Home Energy Model metrics, in place of today's single score, are announced for H2 2027. Announced is weaker than confirmed — timing and detail can still move.
- There is no confirmed minimum band for selling a home. If you have read that sellers will need a C by 2035, that came from a 2021 consultation ambition which never became policy. It is not a rule, and no offer should be built on it.
Read that as context for your questions, not as a verdict on a particular seller: a let below band E may be entirely lawful on a registered exemption.
Before you offer
Note the element grades, the assumed items, the costed recommendations, the floor area and the assessment date, then take your questions to the viewing. None of it entitles you to anything; all of it means you arrive knowing things that were not in the brochure. Start with the property itself: look up its certificate on the EPC checker.
General information, not financial or legal advice. Broc's scores and recommended ranges are informational guidance generated from data; outcomes vary and no result is guaranteed.
Frequently asked questions
Can I see a property's EPC before I make an offer?
Yes. Domestic EPCs in England and Wales sit on a public register, so you can read one for a property you have not viewed or enquired about, and the seller is not notified.
What should I ask an estate agent about the EPC?
Ask about what the certificate flags rather than the band: any element graded Poor or Very Poor, anything recorded as assumed, whether the heating has changed since the assessment, and whether the seller will share twelve months of energy bills.
Does a poor EPC mean I can offer less?
It gives you a case worth arguing, not a right to a reduction. It is the seller's own document, it names the condition of specific elements and puts indicative costs against fixing them — a documented starting point rather than an opinion. Whether the price moves is a negotiation.
Are the costs on an EPC current?
They are priced at the rates in force when the certificate was lodged, so an older one quotes older money. Check the assessment date, treat the figures as rough magnitudes, and get a written quote for the largest item.
Broc
Broc is the badger behind trybroc.io — "broc" is Old English for badger. Where the estate agent speaks in superlatives, Broc speaks in evidence — sold comparables, days on the market, seller-pressure signals — and turns them into a number you can defend.
