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16Collateral field

Basement (declared and predicted) in lending decisions.

Basement (declared and predicted) gives whether the property has a basement, published as separate declared and predicted fields, never blended, published declared with 27.71% coverage across England and 84.88% across Northern Ireland. Attribution and refresh period are in the dictionary.

Core tierDeclaredEngland 27.71%N. Ireland 84.88%Refresh Monthly

Pretira publishes basement (declared and predicted) declared at 27.71% coverage across England, 84.88% across Northern Ireland, refreshed monthly.

16.1Decision rule
// routing pattern
IF basement_predicted = TRUE AND basement_declared = NULL -> route to desktop before AVM

A modelled basement with no declared confirmation is the case a blanket "no AVM where basement suspected" rule can over-decline - keeping the predicted flag separate lets you verify rather than silently reject.

16.2Where it bites
01

Routing rules that currently over-decline on suspected basements.

02

Verification against valuer notes.

03

Storey-count and conversion cross-checks.

16.3Provenance

The declared field carries inspection and record evidence; the predicted field is modelled and published separately. Two fields let your rules and evaluation weight the evidence properly.

Class: Declared · Refresh: Monthly · England: 27.71% · N. Ireland: 84.88%

›GET /property/999000000001sandbox: true
property.attributes.structure.basement_declared_and_predictedfalse
property.attributes.structure.storey_count2
property.attributes.indoor.floor_area_declared_and_predicted145
Sample record only - 1 Cedar Street, CH1 1MN. Deterministic synthetic data. No live call from this page.
16.4Related fields
Storey CountPremiumFloor area (declared and predicted)CoreFrame Construction Material (declared and predicted)CoreBedrooms (declared and predicted)Core
16.5FAQ

Three questions on this field.

Do not infer an outcome from the flag alone. Evaluate it against a dated reference cohort and review false positives, false negatives and uncertain cases before setting a routing threshold.

So your rules can weight declared evidence and model prediction differently rather than acting on a silently blended value.

Storey count, floor area, and planning history for conversions all sharpen a basement decision.

Core tier. Routing rules on this page are illustrative patterns; coverage figures render from the dictionary. Dictionary: July 2026.

Review this field before you deploy it.

Start with a synthetic record or a controlled standard sample. We will show the field provenance, coverage and testing, then scope the production route.

Request a controlled sampleSee commercial routes