Which mortgage lenders use AVMs in the UK?

Most major UK mortgage lenders use automated valuations for lower loan-to-value remortgage applications (typically below 60–75% LTV) where physical inspection risk is lower. Lenders including Halifax, Nationwide, Barclays, and Santander use AVM tools for desktop valuations. Above certain LTV thresholds or for non-standard properties, a physical valuation by a RICS-qualified surveyor is still required.

What data sources does an AVM use?

The Homedata AVM uses: Land Registry Price Paid data (comparable transactions within configurable radius and recency), EPC floor area data (for price-per-sqm normalisation), property type and construction period from EPC and title data, and postcode-level price trend indices. The model returns a central estimate, confidence band (high/medium/low), comparable count, and price range.

GET /api/valuations/estimate/ Sale + rental Pro plan required

Instant Property Valuations for Any UK Address

Q: How accurate are automated valuation models (AVMs) in the UK?

UK AVM accuracy varies by property type and area. For standardised residential properties (flats, semis, terraces) in areas with recent comparable transactions, high-confidence AVM results are typically within 5–8% of actual sale price. Accuracy reduces for unique properties, rural locations, new builds, and areas with thin transaction data. Homedata's AVM returns a confidence band (high/medium/low) and a price range alongside the central estimate.

Q: How is an AVM different from a surveyor's valuation?

An AVM is a statistical model that estimates value from comparable sold prices, floor area, and property attributes — it does not involve a physical inspection. A RICS surveyor's valuation (Red Book) involves a site visit, assessment of condition, and professional judgment. AVMs are faster (instant vs days), cheaper (pence per call vs £200–£500), and scalable — but carry more uncertainty for non-standard or condition-sensitive properties.

Q: Can I use an AVM for a remortgage application?

Many lenders accept AVM-based desktop valuations for remortgage applications at lower LTVs (typically below 75%). The lender will run their own AVM or instruct a panel valuer — borrowers cannot submit an AVM result themselves. However, developers building mortgage origination tools can use the Homedata AVM to pre-screen applications and flag cases likely to require a physical valuation.

Automated property valuation for any UK UPRN. Returns estimated market value using comparable sold prices and EPC floor area data, with confidence scoring (high / medium / low) and a comparable price range. Covers England and Wales.

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Free tier: 100 requests/month. No credit card required.

UK properties covered: 29M+
Comparable radius: 0.5 mi
Cache TTL: 24h
Valuation types: Sale + rent

UPRN in. Valuation out.

One request returns an estimated market value, confidence score, methodology used, and comparable price range. Pass ?type=rent to estimate monthly rental value instead.

✓ Price-per-sqm methodology when EPC floor area available

✓ Median comparable fallback for properties without floor area

✓ Confidence scoring: high / medium / low

✓ Rental yield model fallback when no rental comps available

curl "https://homedata.co.uk/api/v1/valuations/estimate/?uprn=100022612238&type=sale&bedrooms=3&property_type=Terraced" \
  -H "Authorization: Api-Key YOUR_API_KEY"

import requests

r = requests.get(
    "https://homedata.co.uk/api/v1/valuations/estimate/",
    params={"uprn": 100022612238, "type": "sale", "bedrooms": 3, "property_type": "Terraced"},
    headers={"Authorization": "Api-Key YOUR_API_KEY"},
)
val = r.json()
print(f"£{val['estimate_gbp']:,} ({val['confidence']} confidence)")

const res = await fetch(
  "https://homedata.co.uk/api/v1/valuations/estimate/?uprn=100022612238&type=sale&bedrooms=3&property_type=Terraced",
  { headers: { "Authorization": "Api-Key YOUR_API_KEY" } }
);
const val = await res.json();
console.log(`£${val.estimate_gbp.toLocaleString()} (${val.confidence})`);

Response fields

Field	Type	Description
estimate_gbp	integer	Estimated market value in pounds.
range_low_gbp	integer	Low end of confidence band (±5/8/10% depending on confidence level).
range_high_gbp	integer	High end of confidence band.
confidence	object	Object with `level` (`high` / `medium` / `low`), `label`, `reasons`, and `comparable_count`.
method	string	`listing-based` (active listing price), `price-per-sqft` (sold comparables), or `weighted-comparable-average` (fallback).
active_listings	array	Active sale listings used in listing-based method.
sold_comparables	array	Sold comparable properties used in the estimate.
area_stats	object	Area-level price statistics used in the calculation.
subject	object	Subject property details (UPRN, address, type, bedrooms).

Built for

🏠

Portfolio tools

Estimate current market value for an entire property portfolio. Batch by UPRN list, compare estimated vs purchase price.

💰

Mortgage brokers

Pre-qualification checks. Validate whether stated property value aligns with local market data before submitting applications.

📊

Conveyancing

Sanity-check asking prices. Flag outliers that need further investigation as part of due diligence workflows.

🏢

Estate agents

Back up valuations with data. Show clients the comparable evidence behind your market appraisal in seconds.

Related endpoints

Comparables API Property Prices API UPRN Lookup API EPC API

Frequently asked questions

How accurate are automated valuation models (AVMs) in the UK?

High-confidence results are typically within 5–8% of actual sale price for standardised properties with recent comparable transactions. Homedata returns a confidence band (high/medium/low) and price range with every estimate.

Which mortgage lenders use AVMs?

Most major UK lenders use AVMs for lower-LTV remortgage applications (typically below 60–75% LTV). Above that threshold or for non-standard properties, a physical RICS valuation is typically required.

How is an AVM different from a surveyor's valuation?

An AVM is a statistical model using comparable data — instant and cheap but with more uncertainty. A RICS Red Book valuation involves a site visit and professional judgment — slower and more expensive but authoritative for lending purposes.

Can I use an AVM for a remortgage application?

Lenders run their own AVM — borrowers cannot submit one. Developers can use the Homedata AVM to pre-screen mortgage applications and flag cases likely to need a physical valuation.

What data sources does the Homedata AVM use?

Land Registry Price Paid comparables, EPC floor area for price-per-sqm normalisation, property type and construction period, and postcode-level price trend indices.

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