Data catalogue/ Prices & transactions/ AVM
AVM API UK: automated property valuation in England and Wales
Instant automated property valuations via API. Pass a UPRN and receive an estimated sale value, rental value, price per sqm, and confidence score: calculated from comparable sold prices, EPC floor area, and local price trends. Used by mortgage lenders, insurers, and PropTech platforms building inline valuation features.
{
"uprn": 100023336956,
"type": "sale",
"estimate_gbp": 495000,
"range_low_gbp": 470000,
"range_high_gbp": 520000,
"confidence": {
"level": "high",
"label": "High",
"comparable_count": 6
},
"method": "price-per-sqft",
"sold_comparables": [],
"active_listings": []
}What's in the API
Estimated sale value
Point estimate for current market value, with a low/high confidence range. Computed from comparable sold properties within a configurable radius.
Rental valuation
Estimated monthly rental value for the property. Useful for buy-to-let yield calculations and rental portfolio management.
Price per sqm
Estimated value per square metre based on EPC floor area and comparable transactions. Compare against area averages.
Confidence score
0–1 confidence score indicating how many quality comparables were found. Low scores flag sparse data areas where estimates are less reliable.
Comparable evidence
The top comparable transactions used in the calculation: distance from subject, sold price, date, and property type.
Pricing
Valuations are included in the core property profile, a flat 25 tokens, and in the complete profile at 50. Comparable evidence comes with the complete profile; the standalone comparables endpoint is arranged per customer rather than sold self-serve.
Pay as you go
100 tokens = £1
most calls 1 token
£50 a month
5,500 tokens a month · +10% bonus
£250 a month
30,000 tokens a month · +20% bonus
£500 a month
67,500 tokens a month · +35% bonus
Top up any amount from £20 and get exactly the tokens you pay for. Add tokens monthly instead and earn bonus tokens: 10% on any amount, up to 75% from £2,500. Change the amount or stop any time; unused tokens roll over.
Pull this data for your own addresses.
100 tokens = £1 · Top up from £20 · First payment matched 100%.
How accurate are the valuations?
Accuracy depends on comparables density. In active markets (e.g. London postcodes), estimates typically fall within ±8% of sale price. In thin rural markets, uncertainty is higher: the confidence score reflects this.
Is the AVM suitable for mortgage underwriting?
The API is suitable for indicative/screening valuations. For formal RICS Red Book valuations, a qualified surveyor is required. Some lenders use AVM for automated desktop decisions.
Does it cover flats and leasehold?
Yes: flats, leasehold, and all tenure types are supported. The model uses property type and tenure as inputs to select the most comparable transactions.
Related data
Related data endpoints
Comparable Sales
The underlying sold properties used to build AVM estimates.
House Prices
Area-level price trends and distributions for market context.
Valuation API
Full API reference for the valuation endpoint.
More in Prices & transactions
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Pay as you go, 100 tokens = £1, first top-up matched. Get your key and test with real data.