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Every DG Score is assembled from named, dated, licensed UK government data. Every score keeps its receipts: which sources, which dates, which model version.
How a score is built
Official sources → weighted risk categories → one DG Score
Example: a full-deal score. The weighting changes with the evidence behind a score — a score without your purchase and finance figures has no Financial Risk category at all, and reweights the rest. The Methodology page in your workspace shows the live weights for every tier.
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DG Score
The registry
Every source is listed with what it tells us and where it stops. The limits aren't fine print. They're the point.
Supporting evidence is not currently part of the DG Score. New signals only enter scoring after transparent calibration and regression testing.
What do homes actually sell for here, and how has that moved?
Every recorded sale in England and Wales, aggregated into local comparable prices and sales-volume trends.
Where it stops
Area-level comparables, shown as price bands and never passed off as the value of one property.
Official price growth, volatility, and drawdown history for the area, the backbone of Market Risk.
Where it stops
An index describes areas, not individual addresses.
Is the rent on this deal realistic, and what happens if it softens?
Local median rents, used to check an expected rent against what the area actually pays.
Where it stops
Local-authority averages appear as labelled suggestions, never written silently into your numbers.
The support-rent benchmark behind downside-rent stress tests: what income looks like if the market softens.
Where it stops
Stress context only. It adds 0% directly to the score.
Will this property cost money to make lettable, now or by 2030?
Energy band, floor area, and property details, matched to the address where a certificate exists.
Where it stops
Fallback matches are never treated as confirmed property-level facts.
The gap to EPC C, an estimated retrofit cost, and exposure to the October 2030 rental deadline.
Where it stops
No EPC match means lower confidence, never an invented retrofit bill.
What could the land itself do to this investment?
Flood zones and risk bands for England. Severe flood risk hard-caps the score, so there is no strong number on a floodplain.
Where it stops
A mapped-area signal, not a property-level flood certificate.
The equivalent flood-risk banding for properties in Wales.
Where it stops
A mapped-area signal, not a property-level flood certificate.
Population-weighted PM2.5 annual mean by local authority in England.
Where it stops
A local-authority average, not a property-level air monitor.
Strategic road-noise Lden bands screened near the property in England.
Where it stops
National road screening, not a detailed property-level survey.
Whether the address sits in a mining reporting area, where survey, insurance, and lender friction may arise.
Where it stops
A reporting-area flag, not a ground-stability survey.
Distance to historic landfill and permitted waste sites.
Where it stops
Distance bands, not a contamination report.
Erosion risk bands are shown with each deal's area intelligence.
Where it stops
National mapping, not a site survey.
What is written into the title, and who is on the other side of it?
Lease dates and terms matched to the address, the foundation of Lease Risk scoring on leaseholds.
Where it stops
Only counts when match confidence is acceptable; a weak match stays out.
Freeholder health checks: dissolved companies, liquidation, overdue accounts, and overseas owners behind the title.
Where it stops
An unmatched title reads as unknown, never as clean.
Article 4 directions, listed buildings, conservation areas, and green belt: the constraints that shape exits.
Where it stops
Flags and context only, zero score points: council-submitted data is too patchy to score honestly.
What is it like to own, let, and eventually sell here?
Street-level crime counts and category mix, a demand and desirability signal for the area.
Where it stops
An area-level proxy, not a property-level safety assessment.
The geography spine: postcode normalisation, coordinates, and the region joins every other source relies on.
Where it stops
Infrastructure only. It adds 0% directly to the score.
Live address autocomplete when you enter a property.
Where it stops
Address resolution only. It adds 0% directly to the score.
A durable property identifier and coordinate for Great Britain. Optional Linked Identifiers relationships are added only when the OS API key is configured.
Where it stops
OS Open UPRN is not a complete postal address database. It validates identity and location; the existing address resolver still supplies the address.
NaPTAN measures nearby rail, bus, and tram access across Great Britain. BODS adds scheduled weekday bus frequency in England when the feed and API key cover the stop.
Where it stops
Proximity is not frequency. When BODS coverage is missing or not configured, DealGrade shows frequency as unmeasured rather than zero.
UK postcode-level superfast, ultrafast, gigabit, and below-USO infrastructure availability.
Where it stops
Postcode availability is not an in-property speed guarantee. The snapshot is dated infrastructure coverage, not a line test for one home.
The official deprivation decile for the immediate neighbourhood, at a finer grain than any postcode average.
Where it stops
A soft area signal, held to a small weight. England only; elsewhere it lowers confidence rather than guessing.
Sources marked 0% still matter: they carry provenance, stress context, and the geography joins that make every other signal trustworthy. Sources in development are design-approved and built in the open. We only list things we are genuinely building.
The rules we score by
The same four rules govern every source above and every source we'll ever add.
When a source has no answer for a property, the score gets less confident. It is never quietly flattered. A gap in the data is reported as a gap, not scored as a pass.
Address-level data (an EPC, a matched lease) can prefill your deal, labelled with its source. Area averages appear only as clearly-marked bands and suggestions.
Everything here is free, licensed, attributable government data. No scraped listings, no portal feeds, no paid black boxes. If a source fails the licence check, it is dropped.
Each score records the data dates and model version it was built from. When you look back at a decision, you can see exactly what was known at the time.
What we're building next
The next version of the score leans less on our judgement and more on measured evidence.
We're replacing hand-picked cut-offs with rankings worked out from real UK data, showing where a deal sits against everything else. These refresh every month, and we keep every past version, so any older score can still be reproduced exactly.
We score the data as it looked at past dates, then compare against what actually happened in each area afterwards. This shows whether higher scores really did line up with stronger outcomes. It's a check on the past, not a promise about the future.
Rather than a single number that looks more exact than it really is, each score will show a low to high range. The more complete your deal details, the tighter that range gets. Missing data widens the range: it never quietly pushes the number up.
Every new data source has to pass a licence check first. And it only starts to move your DG Score once we've tested it against past outcomes and can show a reliable, clearly-explained reason it belongs.
Score a property and open its evidence: every signal, its source, its date, and its limits on the deal you're actually looking at.