June 2026 · Data

What is a UPRN, and why it matters for construction leads

The Unique Property Reference Number is the single most useful identifier in UK planning data, and most suppliers have never heard of it.

The short version

A UPRN, or Unique Property Reference Number, is a code of up to 12 digits that identifies a single addressable location in Great Britain. Not a street, not a postcode, not a development, a single thing: one house, one flat, one shop unit, one plot of land, even a bus shelter or an electricity sub-station that has no postal address at all.

Think of it as a barcode for a place. The postcode SW2 1AA might cover dozens of front doors. The UPRN points at exactly one of them and keeps pointing at it for the whole life of that property, from the moment planning permission is first sought through to the day it is demolished. That stability is the entire point, and it is why the UPRN quietly underpins a lot of how planning data actually works.

If you sell to construction, supply materials, or chase work off the back of new applications, the UPRN is the field that turns a messy list of addresses into a reliable pipeline. This guide explains what it is, who issues it, where it shows up in planning records, and how to use it so you stop chasing the same job twice.

What a UPRN actually is

The UPRN is a purely numeric identifier of up to 12 digits. It carries no meaning in itself, the digits do not encode the postcode or the region, it is simply a unique key. According to Ordnance Survey and GeoPlace, more than 40 million addressable locations across Great Britain have been assigned one, covering every residential and commercial property plus a long tail of objects that never had a normal address.

Two features make it powerful. First, it is unique: no two properties share a UPRN. Second, it is persistent. As GeoPlace and Ordnance Survey describe it, the UPRN gives a building a consistent identifier throughout its life cycle, from planning permission through to demolition. A house can be re-numbered, change postcode, get split into flats, or sit empty for a decade, and its UPRN stays put. When a property genuinely ceases to exist the record is closed rather than the number being recycled for the next building on the plot.

• Up to 12 digits, numeric, no embedded meaning.
• One UPRN per addressable location, not per postcode or per street.
• Persistent for the life of the property, from planning through to demolition.
• Covers more than 40 million locations in Great Britain, including features with no postal address.

Who issues the UPRN

This is where it gets relevant for anyone working with planning data, because the answer is: your local council, largely. Local authorities hold the statutory duty to name and number streets and properties, and they maintain a Local Land and Property Gazetteer recording every address in their area. When a new plot or unit is created, the council's address custodian allocates the UPRN. Ordnance Survey adds the landscape features that councils would not capture, such as masts or substations.

Those local gazetteers are pulled together nationally by GeoPlace, a joint venture between the Local Government Association and Ordnance Survey, into the National Address Gazetteer. That national dataset is what feeds Ordnance Survey's AddressBase products, the commercial address databases used across government and industry. So a UPRN is created locally, aggregated nationally by GeoPlace, and distributed through Ordnance Survey AddressBase.

Because the UPRN is assigned at the point a property is created or planned, planning applications are often one of the first places a new UPRN appears. That timing is exactly why it is useful to a contractor watching for early-stage work.

Why it is open, and why that matters

For years UPRNs sat behind licensing, which limited who could use them. That changed on 1 July 2020, when Ordnance Survey released the UPRN, alongside the Unique Street Reference Number, as open data under the Open Government Licence, free to use for any purpose with a simple attribution. The same day GeoPlace launched FindMyAddress, a public lookup tool, so anyone can now find the UPRN for an address at no cost.

Around the same time, central government made the UPRN and USRN the mandated public-sector standard for referencing and sharing property and street information. In plain terms, any government system that stores property data is expected to use the UPRN as the common key.

For you this matters in two ways. The identifier in your planning data is the same identifier used by the council's tax records, the energy performance register, the title register and the gazetteer, so different datasets can be joined cleanly. And because it is openly licensed, a tool that surfaces planning leads can carry the UPRN through to you without anyone paying a per-record fee for the privilege.

Where the UPRN shows up in planning data

Most planning portals will show you an application's address, the reference number the council assigned (something like 24/01234/FUL), and a description. Underneath, well-structured planning data also carries the UPRN of the site, or the set of UPRNs where a scheme spans several units. The government's own planning data platform exposes UPRNs against application sites for exactly this reason.

The trouble is that the human-readable parts are unreliable as keys. Council application references restart their numbering every year and follow different formats in every authority, so 24/01234/FUL in one borough means nothing in the next. Addresses are typed by hand and arrive in a hundred variations: Flat 2, 14 High St versus 14a High Street versus 14 High Road. The UPRN cuts through all of that because it is the same number however the address was typed, and it is comparable across every council in the country.

That is the difference between a list of addresses and a usable dataset. You can see the raw applications for any area on a SiteLens council page, for example Birmingham, Lambeth or Amber Valley, each updated daily, and browse the full set from the councils directory.

Why a stable property ID matters for leads

If you are turning planning activity into sales opportunities, three problems quietly eat your time, and a stable UPRN solves all three.

De-duplication. The same property generates many applications over its life: a householder extension, then a loft conversion, then a change of use. Match on address text and you will treat 14a High Street and 14A High St as two leads, or miss that they are the same site. Match on UPRN and one property is one row, every time.

Tracking a site through stages. A serious scheme moves from pre-application to outline consent to a full application to discharge of conditions, sometimes over years and under different reference numbers. The UPRN is the thread that ties those events to one location, so you can see the whole history of a plot rather than disconnected fragments, and judge when a job is actually about to start.

Joining to other data. Because the UPRN is the public-sector standard, you can line up a planning record against the energy performance certificate, the council tax band, or your own CRM, as long as everyone carries the same UPRN. That is how a single application becomes a qualified lead with context rather than just an address on a list.

• One property, one row: de-duplicate applications by UPRN, not by address text.
• Follow a site across pre-app, outline, full and conditions under one persistent key.
• Join planning data to EPC, council tax and your own records without fuzzy address matching.

A practical way to use it

You do not need to download AddressBase or build a gazetteer to benefit from any of this. The useful move is to make sure the planning data you work from is keyed on UPRN underneath, so de-duplication and site history are handled for you, and so your alerts do not fire twice for the same property dressed up as two different addresses.

SiteLens ingests new UK planning applications from more than 320 councils every day, classifies each one by trade, project type and an estimated value band, and lets you filter by area and work type so the alerts that reach you are the ones you can actually win. Because the underlying records carry the property identifier, the saved-leads pipeline treats one site as one lead rather than flooding you with near-duplicates. You can see how the classification and alerting work on the features page, and if you are weighing it against the incumbents there is a side-by-side with Glenigan.

The short lesson: an address is how a human finds a building, but a UPRN is how data finds it. Get your planning leads keyed on the UPRN and the difference between a noisy spreadsheet and a clean pipeline largely takes care of itself.

Start tracking applications properly

If you want planning applications de-duplicated, classified by trade and value, and delivered as a daily email for your area, SiteLens does that out of the box. The free tier costs nothing, and Pro is £39/mo, or £29/mo billed annually, for unlimited application views and the saved-leads pipeline.

Create a free account at sign up and start watching your patch today.

Frequently asked