How Accurate Is UK Property Data? A Guide to Official Sources and Their Known Limitations

The UK Property Data Landscape

The United Kingdom does not have a single, unified property database. Instead, data about properties is spread across a constellation of agencies — HM Land Registry, the Valuation Office Agency, DEFRA, local planning authorities, Ordnance Survey, the Energy Systems Catapult, the Ministry of Housing, Communities and Local Government, and others — each collecting data for their own regulatory or administrative purpose and publishing it in different formats, on different schedules, and with different coverage.

Understanding what each source actually contains, and where it falls short, is essential for anyone making decisions based on property data.

HM Land Registry

**What it covers:** Registered title information (ownership, tenure, charges, covenants), title plans, price paid data, and UK House Price Index.

**Strengths:** Legal authority — the register is definitive for registered land. Price Paid Data covers every registered transaction since 1995. Widely available and open data.

**Limitations:** Approximately 13% of land in England and Wales remains unregistered. Title data reflects the position at the last point of registration — it may not capture recent changes that have not yet been submitted. Title plans show general boundaries, not exact legal ones. Price Paid Data excludes certain transaction types (see separate guide). The register can be several weeks or months behind the actual completion date for properties where registration is delayed.

Energy Performance Certificate Register

**What it covers:** EPC assessments for residential and commercial properties in England, Wales and Northern Ireland, lodged since 2008.

**Strengths:** The most comprehensive property-level energy efficiency dataset available. Covers well over 20 million residential records. Accessible as open data.

**Limitations:** Coverage is uneven — only properties that have been sold or let since 2008 are required to have an EPC. EPCs are valid for ten years, so many records are stale. Assessment methodology (RdSAP for existing dwellings) is modelled rather than measured, and assessor variability is documented. New-build completion EPC lodgement can lag physical completion.

Valuation Office Agency (VOA)

**What it covers:** Council Tax band assignments for all residential properties in England and Wales; non-domestic (business rates) rateable values; Private Rental Market Statistics.

**Strengths:** Council tax bands cover essentially the entire residential stock. Private Rental Market Statistics, published quarterly, are the most comprehensive official source of rental market data in England and Wales.

**Limitations:** Council tax bands were set in 1991 and have never been revalued for England (Wales revalued in 2003). Many properties are incorrectly banded due to this historic stasis. Non-domestic rateable values are revalued more frequently (the 2023 revaluation is current) but individual assessments can be disputed and may not reflect market rents. The VOA appeals process can take years.

Ordnance Survey / GeoPlace

**What it covers:** Address data (AddressBase, including UPRNs), large-scale mapping, topographic data.

**Strengths:** AddressBase is the most authoritative national address dataset and is used by emergency services, government agencies and commercial organisations. UPRNs enable cross-dataset linking.

**Limitations:** Local authority address data quality varies. New-build addresses can take months to appear in AddressBase. Properties with complex or non-standard addresses (converted buildings, temporary structures) can have mismatches between datasets. AddressBase products are licensed rather than fully open, though the Open UPRN dataset makes UPRNs publicly available.

Planning Data — Local Planning Authorities

**What it covers:** Planning applications, permissions, refusals, enforcement notices, listed building consents, tree preservation orders, conservation area designations.

**Strengths:** Planning application data is a matter of public record. The Planning Data platform (planning.data.gov.uk), developed by the Department for Levelling Up, Housing and Communities, is progressively aggregating local authority planning data into a national standardised dataset.

**Limitations:** There is no complete, machine-readable national planning application database — the Planning Data platform is still incomplete as of early 2026, and data quality varies dramatically between authorities. Historic planning permissions (particularly pre-2000) are often on paper only. Enforcement notices may not appear in digital searches.

Environment Agency

**What it covers:** Flood risk (Flood Map for Planning, National Flood Risk Assessment), contaminated land (some datasets), abstraction licences.

**Strengths:** The Environment Agency's flood risk data is the statutory basis for planning decisions. The Flood Map for Planning is publicly available and updated regularly.

**Limitations:** Flood risk mapping does not cover all water bodies or all types of flooding (in particular, surface water flood risk from overwhelmed drainage is covered by a separate Surface Water Flood Map, and the two are often confused). Climate change projections are incorporated into some but not all products. Contaminated land data is incomplete — the Environment Agency does not hold comprehensive records of all potentially contaminated sites.

What This Means for Property Research

No single dataset tells the whole story. Property Passport UK aggregates data from multiple official sources — HMLR, the EPC register, the VOA, Ordnance Survey's AddressBase, the Environment Agency and planning authority datasets — and presents them together with clear attribution so users can see the source, the date and the limitations of each data point. Knowing the provenance of data is as important as knowing the data itself.