Nestfair.

Know what it’s worth before you offer.

Nestfair values homes in England and Wales from 31 million recorded sales. You get an estimate with a likely range, a warning if a lender might value it below the asking price, and what you’ll pay on top of the price before you get the keys.

Add the asking price, floor area or rent if you have them

Floor area matters most. If the home has been extended, or you know its real size, add it and we’ll use that instead of estimating from the street. On a house bigger than its neighbours it can change the figure a lot.

10.3% median error on 2,400 sales it hadn’t seen · open data only · 30 to 90 seconds per report

What’s in a report

A report takes about a minute and covers what a buyer’s agent would check.

Value and likely rangeAn estimate, plus the range the price will probably fall in, so you can see how sure we are.
Down-valuation riskWhether the asking price is above what recent sales support. A lender’s surveyor checks the same thing.
Costs to completionStamp duty, legal fees, survey, removals and monthly bills, added up.
Questions to askWhat a good buyer’s agent would raise about this home, such as the lease length, flood risk or planning next door.
The areaHow far the nearest good schools are, recent crime, live planning applications and flood zones.
Documents to collectThe papers to ask for on this property, as a checklist you tick off as they arrive.

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 to £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, about 20% above the estimate, so the value is more likely near the top of the range.

Full evidence pack →

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

The extension adds this panel to Rightmove, Zoopla and OnTheMarket listings.

Add to Chrome, free

Works on the listingOpen a home on Rightmove, Zoopla or OnTheMarket and click Value it. You don’t need to copy the address.
Next to the asking priceYou see the estimate, likely range and down-valuation risk before you’ve contacted the agent.
Full reportThe panel links to the complete report on nestfair.co.uk.

How it works

Built by a former property valuation modeller, from the sale records a valuer would use.

Recorded salesEach estimate starts from homes that sold near you, and the report shows how many it used.
Similar homes count moreHomes like yours, on or near your street, count for more than homes further away or of a different type.
Ranges you can checkEach estimate has a likely range and a confidence grade. We test how often sale prices land inside those ranges and publish the result.

Median error 10.3% on 2,400 sales the model hadn’t seen, using open Land Registry and EPC data. Homes over £1M are harder to value, so their range is wider and their confidence grade lower. 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