03Verification

Trust the record. Verify the property.

Declared and modelled attributes, separated, so your routing rules stand on provenance - not on a fact find that cannot see the extension out the back.

Request a verification sample See the field catalogue

›GET /property/999000000001?fields=property/attributessandbox: true

attributes.indoor.bedrooms_declared_and_predicted4

attributes.indoor.floor_area_declared_and_predicted145 m2

attributes.structure.storey_count2

attributes.structure.frame_construction_materialbrick

attributes.structure.basement_declaredfalse

attributes.structure.basement_predictedfalse

declared and modelled kept separate · Dictionary: July 2026

03.1What verification closes

The altered home.

A Great Britain planning record can surface a recorded application for an extension, dormer or annexe. It is a prompt for review, not proof of the current physical state or complete coverage of every alteration.

Folded dimension drawings with a brass rule and calculator on a slate desk — Dimension drawings, rule and calculator - the paper trail of an alteration

Flags that state their evidence status.

Basement, attic and storey fields state whether they are declared or modelled. Where the public register names a test, its metric and limitations stay with the field; otherwise the lender evaluates the flag before setting a routing rule.

Fact-find prefill.

One call can return selected attributes for the applicant to confirm or correct. Compare completion, correction and exception rates in the lender journey before claiming a data-quality improvement.

Building-level truth by UPRN.

UPRN is the join key for the property record. Parent, sub-property and sibling identifiers remain visible so the lender can inspect the resolved unit and route an uncertain match for review.

03.2On the record

Every field states its class and its coverage.

A selection from the dictionary. Class is declared or modelled; coverage is published per nation; refresh is rendered from the dictionary, never assumed.

FieldClassEnglandN. IrelandRefresh

BedroomsModelled100% ENG98.41% NIMonthly

Floor areaModelled99.96% ENG98.82% NIMonthly

Construction materialModelled99.94% ENG97.21% NIMonthly

Basement flagDeclared27.71% ENG84.88% NIMonthly

Planning applicationsDeclared9.27% ENG0% NIMonthly · incidence

Planning is a Great Britain layer. Around 9.27% of English homes have an application recorded in the current dictionary response; absence is not proof that no alteration occurred. Planning history is live in flat files and the portal; the planning API is in development. Dictionary: July 2026

03.3FAQ

Questions from the second line.

The dictionary flags every field as declared, modelled or derived. Where the public evidence register names a test, its metric label and limitations stay with the modelled field. Bedrooms and floor area are published as declared-and-predicted, while the basement flag is published as declared and predicted in separate fields, never blended.

Prefill changes a blank fact find into a confirmation and correction task. Whether that reduces errors or improves completion must be measured in the lender journey; the integration can retain which fields were corrected where the agreed workflow supports it.

Selected physical attributes have UK records, with Northern Ireland near GB depth for bedrooms, floor area and construction. Planning history remains Great Britain today. Coverage and refresh are published per field rather than implied for the whole product.

Verify a segment of your book.

Start with sample records or a lender-run evaluation. Inspect the attributes with their class and coverage before deciding whether any belong in the fact find.

Request a verification sample See the field catalogue