Nestfair.

Know what it’s worth before you offer.

The listing tells you what the seller wants. Nestfair tells you what the evidence says: the value, the likely range, the down-valuation risk, and every cost between offer and keys. Built on 31 million public sale records.

Add asking price, floor area or rent — the more you tell it, the sharper the estimate

Floor area matters most. If it’s been extended or you know the real size, add it and we’ll value off that instead of estimating from the street — it can move the figure a lot on a home that’s bigger than its neighbours.

10.3% median error, tested on 2,400 real sales the model hadn’t seen · open data only · ~30–90s per report

What you get

One search. The evidence a buyer’s agent would gather, in about a minute.

An honest valuationA calibrated estimate with a real likely-range, not a single number pretending to be precise.
Down-valuation riskWhether the asking runs ahead of the evidence, so you know it before the lender’s surveyor does.
Every cost to completionStamp duty, legal, survey, removals and monthly bills: the real cash you need, not just the price.
The questions to askLease length, flood risk, planning next door, the diligence a good buyer’s agent would raise on this place.
The area in numbersNearest good schools by distance, crime, live planning applications, flood designations.
Your document packExactly which papers to gather and chase, tailored to the property, ticked off as they land.

This is what comes back

66B Northcote Road, London SW11

Northcote · Wandsworth · London

£1,334,593indicative value · Lower confidence
£1.22M to £1.57Mmost likely range
756comparable sales used
Ask before you offerNo energy certificate on file

You can’t legally market a home without one, so ask the agent where it is.

Chrome extension

Or value any listing while you browse.

rightmove.co.uk/properties/149203845
Buy · Rent · House Prices · Find AgentSign in
A period home on a Rightmove listing with the Nestfair panel open over the photo.

NESTFAIR

22 Mercers Road, London N19 4PJ

£2,040,480

estimate · fair confidence

£2.04M – £2.46Mmost likely range
+22.5%asking vs evidence ·
down-valuation risk elevated

Its 288 m² floor area implies about £2.46M at local £/m² rates, ~20% above the estimate — so the top of the range carries more weight here.

Full evidence pack →

Mercers Road, Islington, London N19
Marketed by Drivers & Norris
Guide Price
£2,500,000

One click on any Rightmove, Zoopla or OnTheMarket listing — the verdict, right over the photos.

Add to Chrome, free

One click, on the listingOpen a home on Rightmove, Zoopla or OnTheMarket and Nestfair values it right there, no copy-pasting the address.
The verdict where you need itThe estimate, the likely range and the down-valuation risk, next to the asking price, before you even enquire.
Straight to the full reportOne tap opens the complete evidence pack back here on nestfair.co.uk.

Why you can trust it

Built by a former property valuation modeller, on the same evidence a professional valuer would weigh.

Grounded in real salesEvery estimate is anchored to actual recorded transactions near you, not an opaque number pulled from thin air.
Weighted to your propertyHomes that genuinely resemble yours count for more than distant ones, so the number reflects your street and your kind of property, not a blunt postcode average.
Honest about certaintyEvery estimate comes with a likely range and a confidence grade, calibrated against measured accuracy, so you know how far to trust it.

10.3% median error on 2,400 real sales the model hadn’t seen, built on open Land Registry and EPC data. Homes over £1M are harder to value, so their range is wider and we mark them lower confidence. How we tested it →

sources: HM Land Registry · EPC register · UK HPI · police.uk · planning.data.gov.uk
Built by a former property valuation modeller · A Nestfair product · © 2026 Arvorithm Labs Ltd · company no. 17376192