Why do schools sometimes change URN?

A URN is stable for the life of an institution — but institutions are re-established more often than you might expect, and each time a new number is issued.

England · 2024/25 · DfEPlain-English guide

When a new URN is issued

Academy conversion. A maintained school that becomes an academy is legally a new establishment, and receives a new URN. The old record is closed.
Merger or amalgamation. Two institutions combining usually produces a new entity with a new number.
Change of phase or type. A school adding or removing a sixth form, or converting to a 16-19 institution, may be re-established.
Closure and replacement. A predecessor school closing and a successor opening on the same site are two different URNs.

What this means for comparing years

It means an institution’s history is not always a single continuous line. When the Explorer adds earlier years, an institution that converted between them will appear as a closure and an opening rather than as a change. That is a property of the identifier, not a data error — and it is why year-on-year institution-level comparison needs care.

How this build handles it

This prototype covers a single academic year, so URN changes do not yet affect any figure. When earlier years are added, provision will be classified as consistent, newly observed or previously observed — deliberately neutral terms, because a URN change can produce all three without anything changing on the ground.

Related guides

Explained

What is a school URN?

The Unique Reference Number is the identifier that makes this Explorer possible. What it is and why names cannot be used instead.

Explained

How is post-16 subject provision measured?

The exact method behind the Explorer: which rows are used, how totals are counted, and what the denominator is.

Sources & methodology: All figures come from the DfE’s Schools and colleges — subject entries and grades and institution information data sets for academic year 2024/25 (final), joined on school URN. Only the Total exam entries category is used, so no entry is counted twice. Coverage is measured against the number of institutions with recorded entries in the relevant qualification family, not against all establishments. Sixth-form consortia and partnership centres are excluded from all totals, denominators and percentages, because DfE excludes them from its national figures; they remain listed and flagged in the Explorer. On that basis the England A-level total of 787,688 entries reconciles with the DfE national comparator to within 0.16%, and the four families together to within 0.15%. Institution coordinates come from Get Information About Schools. T Levels do not appear in this release; they are shown separately on the Explorer’s T Levels tab, from DfE provider-level T Level results, and are never added to any entry total here.

Last checked 17 August 2026. Observed provision is based on recorded exam entries. An institution with no recorded entries in a subject may still have offered it — see what subject provision means.