Evidence types
Each significant claim is labelled with what kind of thing it is.
| Label | Meaning |
|---|---|
| Official record | a value copied directly from an authoritative public register. |
| Derived statistic | a figure Door Number calculated from official records; the calculation is stated. |
| Estimate | a modelled figure with acknowledged uncertainty — used sparingly and always labelled. |
| Community-sourced (discovery) | from a community-maintained dataset such as OpenStreetMap — useful for discovering what is nearby, but not an official record; coverage is uneven and it should be confirmed against the relevant authority. |
| Editorial context | written background, sourced from a named reference, that is not itself a datum. |
Property identity
An address is resolved to its UPRN by Resi IQ's address-matching engine, using the Energy Performance of Buildings Register and Ordnance Survey Open UPRN. Where no confident match exists, the page still renders as an address, clearly marked, with no invented identifier.
Energy and sales records
Energy performance
Taken verbatim from the most recent EPC lodged for the property. The A–G scale, band thresholds and any potential rating are the assessor's, not Door Number's.
Sales history
Every HM Land Registry Price Paid transaction recorded against the exact address since 1995. Prices are the recorded consideration at the time of sale — not inflation-adjusted, and not a current valuation.
Market and area context
Door Number computes simple descriptive statistics (count, median, range, property mix) from Price Paid transactions on the same street within the same full postcode. These are explicitly derived statistics. Small samples are marked low confidence. Door Number does not publish an automated valuation of an individual property.
Planning designations, heritage assets and flood warnings are read from official open datasets; schools, transport, amenities and green space are read from OpenStreetMap, a community-maintained dataset, and are labelled community-sourced — a way to discover what is nearby, not an official record. Distances are straight-line unless stated. Nothing about quality, desirability or journey time is asserted unless it comes directly from a named source.
Missing data and absence
When a dataset holds no matching record, Door Number says so in terms bounded to that dataset — “not recorded on planning.data.gov.uk”, “no warning in force at the last check” — and points to the authority that holds the definitive position. It never turns an absent record into an absolute “none”, “not designated” or “not at risk”. A section with no data at all is hidden rather than shown empty.
A value Door Number does not hold is shown as “—”, never as zero and never estimated.
Why a page can be shorter than another
Coverage depends on the records available for that address and the sources that can be checked. A shorter page is not an invitation to fill the gaps with assumptions.