An asking price is a marketing decision. What a home is worth is an evidence question — and in England and Wales the evidence is public: HM Land Registry records the actual sold price of nearly every transaction since 1995, and the EPC register gives you floor areas to normalise by. Anyone willing to spend an hour with those two datasets can value a home more honestly than a listing portal.
This guide is the method: find true comparables, normalise by size, adjust for time and condition, and turn the result into an offer. It is guidance on reading evidence, not financial advice — your own circumstances, and a surveyor’s view of condition, complete the picture.
Start from sold prices, not asking prices
Sold prices are facts; asking prices are opening bids. Depending on the market’s temperature, homes routinely sell several percent under — or over — asking, so calibrating your offer to other asking prices means anchoring to other sellers’ optimism.
HM Land Registry’s Price Paid data records what almost every home in England and Wales actually changed hands for — searchable free at gov.uk/search-house-prices. One caveat: sales appear in the register weeks or a few months after completion, so the very latest market movement is always slightly out of frame. That lag matters in fast-moving markets — remember the freshest comparables are a snapshot of deals agreed three to six months before you read them.
Sources: GOV.UK — search sold house prices · UK House Price Index reports
Find true comparables
A comparable ("comp") is a sold home that a rational buyer would have considered instead of yours. The hierarchy is intuitive:
Three to five decent comps beat twenty loose ones. If the same street offers nothing recent, widen the net one ring at a time and note what you are giving up with each step — every widening adds noise you will need to adjust for.
- Same building or street, same property type, sold within 12–18 months — gold.
- Neighbouring streets of the same stock and era — good, adjust for street-level differences (main road vs cul-de-sac, school catchment, parking).
- Same postcode district, similar type and size — usable for context, too coarse to price from on its own.
Normalise by size: £ per square metre
Dividing sold price by floor area (from each home’s EPC) turns incomparable homes into one comparable number. Suppose nearby terraced houses sold between £3,100 and £3,800 per m², clustering around £3,400: a 95 m² example is centred near £323,000, and an asking price of £375,000 is visibly priced at the top of — or above — the local range.
Think in percentile bands rather than single points: the bottom of the local £/m² range is usually homes needing work or on compromised plots; the top is refurbished, extended or best-positioned stock. The honest question is where this home genuinely sits in that distribution — most of us instinctively place homes we like too high.
Adjust for time and condition
A comp from 18 months ago sold in a different market. Adjust it using the direction and rough magnitude of local price movement since (the UK House Price Index publishes this by local authority) — in a market that has moved a few percent, an unadjusted old comp can mislead by more than your entire negotiating margin.
Then adjust for condition, in pounds rather than vibes: a dated kitchen and bathroom might be £15,000–£30,000 of works; a full renovation far more. Buyers systematically underestimate refurbishment costs and timelines, so if the home needs work, get indicative quotes before the offer, not after. A RICS surveyor’s report is the professional check on condition — nothing in the data substitutes for it.
Worked example: valuing a 1930s semi, start to finish
The target: a three-bed 1930s semi, 92 m² by its EPC, asking £340,000, dated kitchen and bathroom but sound. The comps: No. 41 same road, 90 m², modernised, sold 8 months ago for £325,000 (£3,610/m²); No. 12, 95 m², original condition, sold 14 months ago for £305,000 (£3,210/m²); a matching semi one street over, 88 m², sold 5 months ago for £312,000 (£3,545/m²); and an extended 105 m² example, sold 11 months ago for £355,000 (£3,380/m² — extensions usually add value at a lower rate per metre than the core house).
Time-adjust: the local index has risen about 2% over the past year, so the older comps drift up — No. 12 becomes roughly £311,000 (£3,275/m²). The adjusted range for unmodernised-to-modernised stock is now about £3,275–£3,650/m². Our 92 m² target in honest mid-condition — sound but dated — belongs below the modernised comps: say £3,350–£3,450/m², or £308,000–£317,000. Subtract nothing further for the kitchen and bathroom (the £/m² placement already reflects condition — subtracting again is double-counting, a classic error in both directions).
Conclusion: the £340,000 asking price sits £25,000–£30,000 above what the evidence supports, roughly the cost of the refurbishment it needs. A first offer around £305,000–£310,000, sent with the three strongest comps attached, is not a lowball — it is the market, in writing. Where you settle depends on competition; where you walk away (£320,000, say) you decided before the viewing.
From value to budget: what you can actually pay
The valuation tells you what the home is worth; your financing decides whether that number is available to you. Lenders typically cap borrowing around 4.5 times income (a little more for some borrowers, less where other debts bite), stress-test affordability at rates above the one you will pay, and lend against the lower of price and their valuer’s figure. The free government-backed MoneyHelper service has impartial calculators and guidance on the whole affordability picture.
Work the budget backwards before you fall for anything: deposit plus maximum sensible borrowing, minus stamp duty, legal costs, survey and moving costs, equals your true ceiling. Knowing that number — and the monthly payment it implies at today’s rates, plus a stress margin — is what lets you bid confidently up to the evidence and not a pound past it. This is guidance on arithmetic, not financial advice: a mortgage broker or adviser earns their keep on anything non-vanilla.
A rough ceiling, not an offer — lenders stress-test your outgoings, debts and credit history, so real criteria vary widely. Not financial advice.
Sources: MoneyHelper — mortgage affordability
Common valuation mistakes
Six errors account for most overpayment. All are avoidable with the method above:
- Anchoring to asking prices — calibrating against other sellers’ optimism instead of sold facts.
- Using listings as comps — a home "on at" £350,000 proves nothing; only completions count.
- Ignoring tenure and lease length — an 80-year-lease flat is not comparable to a 125-year one at the same price (see our leasehold guide).
- Double-counting condition — placing a home low in the £/m² range for its dated kitchen, then subtracting the kitchen again.
- Crossing invisible boundaries — school catchments, conservation areas and postcode-prestige lines can move value 5–10% between adjacent streets; a comp across the line is not a comp.
- Skipping the time adjustment — an 18-month-old comp in a market that moved 4% is mispriced by more than most negotiations ever achieve.
Turning evidence into an offer
Your comps give you a value range. Where to pitch within (or outside) it depends on the market’s temperature, which you can also read from evidence: how long has the listing been up? Has the price been cut? Are similar local homes going under offer within a fortnight, or lingering for months?
In a slow market, with a home that has sat unsold beyond the local average, opening below the evidence range is rational, not rude. In a hot market for the same house, the evidence tells you the ceiling at which you stop: paying over asking can be justified when comps support it — the mistake is paying over evidence. Decide your walk-away number before the viewing, in writing, when you are calm.
Evidence beats mood
Every stage of buying is engineered to raise your emotional temperature: staged viewings, "other interested parties", the sunk cost of surveys and searches. The evidence file you built is the antidote — it does not fall in love.
It also pre-empts the most common late failure: the down-valuation. Your mortgage lender’s valuer will run essentially the comparables exercise described here, and if your agreed price exceeds what the evidence supports, the loan shrinks and the deal wobbles. If your offer was built on the same sold-price evidence the valuer uses, that risk is largely priced out from the start.