AVM API UK — Automated Property Valuation for Any UPRN
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.
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.
Sample response
{
"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": []
}Pricing
AVM calls use weighted billing (5 calls per request). Available from Growth plan (£149/month).
Free
£0
Limited
Starter
£49
2,000 calls/mo
Growth
£149
10,000 calls/mo
Pro
£349
50,000 calls/mo
FAQ
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.