How a UPRN Is Assigned: What the Unique Property Reference Number Actually Is and How to Find Yours

What Is a UPRN?

A Unique Property Reference Number (UPRN) is a numerical identifier assigned to every addressable location in Great Britain. It is the closest thing the UK property sector has to a universal property identifier — a single number that refers to one specific property and no other, regardless of how that property's address changes over time.

UPRNs can be up to 12 digits long and are assigned to a remarkable breadth of locations: residential houses, flats, commercial premises, caravan sites, mooring points, letterboxes without a building, and even some fields and open spaces that carry an official address. There are over 40 million UPRNs in Great Britain.

Who Creates and Maintains UPRNs?

UPRNs are part of the AddressBase product suite managed by GeoPlace, a public sector limited liability partnership jointly owned by the Local Government Association and Ordnance Survey. In practice, the process works as follows:

**Local authorities** are the primary creators of UPRNs. When a council issues a postal address — for a new development, a subdivided flat, or a converted barn — it creates a UPRN for that address in its local authority address management system. The council is responsible for maintaining and updating its address data.

**GeoPlace** aggregates the local authority data with Ordnance Survey's large-scale mapping, Royal Mail's Postcode Address File (PAF), and Valuation Office Agency (VOA) records to produce AddressBase, the national address dataset used across public services, emergency services, and the property industry.

**Ordnance Survey** then licenses AddressBase products to commercial users, including property data companies, lenders, insurers and conveyancers.

How a UPRN Is Physically Assigned

When a local authority planning department approves a new development or subdivision, it triggers an address-creation workflow. A planning officer, or a street naming and numbering officer, formally assigns a postal address. At the point of address creation in the council's address management software, a new UPRN is generated. The UPRN is assigned to a specific geographic point (a coordinate pair in the British National Grid) rather than to the building itself, which is why UPRNs survive demolition and rebuilding — the address location persists even if the structure changes.

The sequence of events for a new-build property is roughly:

1. Planning permission granted and address requested by developer.

2. Council assigns street name, house number or name, and creates the address record.

3. A UPRN is generated and attached to that address coordinate.

4. The council uploads the record to GeoPlace.

5. GeoPlace incorporates it into the next AddressBase release (updates are frequent, typically monthly).

6. Royal Mail creates a postcode entry once the property is ready to receive mail.

Until step 6, a property will have a UPRN but may not appear in Royal Mail's PAF — which is why new-build owners sometimes find that sat navs and online checkout forms cannot find their address even though they have already moved in.

Why UPRNs Matter for Property Data

The UPRN's power lies in its ability to act as a linking key across otherwise disconnected datasets. Government agencies, insurers, lenders and property portals all hold data about properties, but they historically used different identifiers — postcodes, addresses, title numbers, council tax reference numbers. A single typo in an address can cause records to fail to match.

With a UPRN as the common key, datasets can be linked reliably:

• HM Land Registry title data linked to a specific address.
• EPC (Energy Performance Certificate) data linked to the same address.
• Council tax band from the Valuation Office Agency.
• Planning applications from the local authority.
• Flood risk from the Environment Agency.
• Crime statistics from police.uk.

Property Passport UK uses UPRNs as a core linking mechanism, enabling a joined-up view of official datasets for each individual property. When a UPRN is available, data accuracy improves significantly because matching is done by identifier rather than by fuzzy address matching.

How to Find the UPRN for Your Property

The Open UPRN dataset, released as open data by GeoPlace and Ordnance Survey in 2020, means UPRNs are publicly accessible. You can find the UPRN for any address in Great Britain by:

• **Via the OS Data Hub:** Ordnance Survey provides a UPRN lookup tool at osdatahub.os.uk.
• **Via local councils:** Many councils publish their local address datasets including UPRNs on their open data portals.
• **Via property data platforms:** Property Passport UK displays the UPRN for each property it covers alongside other official identifiers.
• **Via planning portals:** Many planning applications reference the UPRN of the site.

Your UPRN does not change unless your address physically changes. If your house is renumbered, or if a flat is merged with another, a new UPRN may be issued. If you are involved in a new development and need to check that a UPRN has been correctly assigned, contact your local authority's street naming and numbering team.