Automated Property Valuations
for UK Professionals
Machine learning valuations trained on 31 million Land Registry transactions. England & Wales • Detached • Semi-detached • Terraced • Flats
How Accurate Are We?
Benchmarked against actual Land Registry sale prices — not surveyor estimates or asking prices.
Taller and narrower = more accurate
v6.11 model · 147,188 test properties · Q4-2025 bulk test
* Hometrack reports 80% of valuations within 10% of surveyor’s recommended value (source: hometrack.com). Surveyor valuations are themselves estimates — not final sale prices. Direct comparison with Land Registry benchmarked figures is not possible.
Accuracy by Segment
v6.11 model, 147,188 test properties (Q4-2025 bulk test)
By Property Type
| Type | MdAPE | PE10 | Count | Bias |
|---|---|---|---|---|
| Flat | 7.2% | 63% | 23,817 | +2.5% |
| Terraced | 5.9% | 69% | 47,321 | +1.7% |
| Semi-Detached | 5.6% | 72% | 43,907 | +1.2% |
| Detached | 6.0% | 70% | 32,143 | +1.1% |
By Price Band
| Band | MdAPE | PE10 | Count | Bias |
|---|---|---|---|---|
| <£150k | 9.3% | 53% | 21,652 | +12.6% |
| £150-300k | 5.6% | 72% | 59,783 | +0.8% |
| £300-500k | 5.3% | 75% | 43,719 | -0.8% |
| £500k-1M | 6.3% | 69% | 20,176 | -2.1% |
| £1M+ | 10.0% | 50% | 1,858 | -6.5% |
Who Is This For?
Mortgage Lenders
Origination screening, remortgage, Basel 3.1 portfolio revaluation
Surveyors & Valuers
Desktop review support, independent cross-check, bulk audits
Brokers & Conveyancers
Pre-application price checks, indicative valuations
Property Investors
Deal screening, portfolio monitoring, acquisition due diligence
Pricing
Pay per valuation. No subscription. No contract. Purchase valuation bundles.
| Bundle | Price | Per Valuation | Valuations |
|---|---|---|---|
| Single | £9.95 | £9.95 | 1 |
| Starter | £49 | £4.90 | 10 |
| Professional | £199 | £1.99 | 100 |
| Portfolio | £499 | £0.50 | 1,000 |
| Enterprise | £1,999 | £0.20 | 10,000 |
For technical detail on our methodology, features, and regulatory alignment, see our Technical Summary.
Common questions
Can I test your accuracy before buying?
Yes. Upload up to 250 recent completions and we’ll value each as of today. Because Land Registry data takes months to publish, your recent sales can’t be in our training data — a structurally blind test. No cost, no commitment. You can also review a sample report and our published accuracy metrics before purchasing.
Can I run Gadsden alongside my existing AVM?
Yes. Many lenders use Gadsden as an independent cross-check at 20p per valuation. When both AVMs agree, you have more confidence. When they disagree, you’ve flagged a property worth a second look. No contract, no integration required — CSV upload or API.
Download our materials
Get a one-page PDF summary to share with colleagues, or visit our downloads page for the full set.
Download PDFAll accuracy figures from the Q4-2025 quarterly bulk test of 147,188 Land Registry transactions. Benchmarked against Land Registry completion prices.
gadsdenvaluations.com • sales@gadsdenvaluations.com