Catchment areas explained: what they are and what they aren’t

Last reviewed October 2026

“Catchment area” is one of the most used and most misunderstood terms in school admissions. It rarely means a fixed line on a map that guarantees a place. Here is what catchment really means, why it moves, and how to judge your realistic chances.

Checking a specific school? Find it on the map to see how close a home actually is in a straight line — the measure most admission authorities use — then compare that with the school’s most recent cut-off distance below.

What a catchment area actually is

For many schools, especially community primary schools, there is no formal boundary at all. When the school has more applicants than places, it offers places to the children who live closest, measured by distance from home to school. The “catchment” people talk about is really just how far out that year’s last offered place happened to reach.

Some schools and local authorities do define priority areas, and faith schools often use religious criteria rather than distance. So catchment can mean quite different things depending on the school.

The definitive answer for any given school is its published admission arrangements, and it is worth going to the source rather than relying on word of mouth or property listings. Look in three places: the school’s own website (usually under “Admissions”), your local authority’s composite admissions booklet (published each autumn, covering every school in the area), and the local authority’s admissions team, who can tell you which criteria a school uses and, often, last year’s furthest-offered distance. For academies and faith schools, which set their own arrangements, the school’s or diocese’s own site carries the fullest detail.

How is the distance measured?

This catches a lot of people out. Most admission authorities measure distance in a straight line (“as the crow flies”) from your home to the school, not the distance you would actually walk or drive. They typically measure from a fixed point on the property to a fixed point at the school, defined precisely in the policy, so that every applicant is measured the same consistent way.

A minority of authorities instead measure the shortest available walking route along roads and paths. The two can give quite different answers where a river, railway or main road forces a long detour — a home that is close in a straight line may be far by road, or the reverse. Because it varies, check the exact method in the school’s or local authority’s admission arrangements rather than assuming. The map on this site shows straight-line proximity, which is the common case, but treat it as a guide, not the official measurement.

Why it is an approximation, not a guarantee

The distance that gets a place in changes every year. If more families with young children move into an area, the school fills from closer to home and the effective catchment shrinks. A quieter year and it stretches further out. A home that was comfortably “in catchment” one year can be borderline the next.

That is why last year’s cut-off distance is a useful guide but never a promise. Treat it as a rough indicator of your chances, not a boundary you are inside or outside.

How criteria change the picture

Not every school admits on distance. Grammar and some other selective schools use a test or aptitude assessment. Faith schools may prioritise by religious practice. Some schools give priority to specific feeder schools or defined priority areas. For these, “how close do I live” is the wrong question, so a distance-based catchment idea does not apply in the usual way.

Siblings are the other big factor. Nearly all schools place children who already have a brother or sister at the school high in their criteria — usually above distance — so a sibling link can secure a place well outside the normal catchment, and in a popular school the sibling and looked-after categories can fill much of the intake before distance is even reached. If you are relying on a sibling priority, check the exact wording: schools differ on whether the sibling must still be attending when the younger child starts, and how they treat step- and half-siblings or children at a linked infant/junior school.

Always read the individual school’s oversubscription criteria, because they decide who gets in far more reliably than any catchment map.

Judging whether a home is realistically in range

A sensible approach: find the school on the map to see how close a home actually is, then compare that with the school’s most recent cut-off distance if it publishes one, or ask the school or local authority. Think in terms of likelihood rather than certainty, because that is genuinely how it works.

Be wary of estate agents’ claims that a property is “in catchment”. It may have been last year, and it may not be this year, and for selective or faith schools it may be irrelevant.

Common questions

What is a catchment area and how is it calculated?

It is the area a school draws pupils from. For many schools there is no fixed boundary: when applicants outnumber places, the school offers places to the children who live closest, so the “catchment” is really how far out that year’s last offered place reached. It is worked out after the fact and moves year to year.

How is the distance to school measured?

Usually a straight line (“as the crow flies”) from a fixed point at your home to a fixed point at the school. A minority of authorities use the shortest walking route instead, which can differ sharply where a river or railway forces a detour — so check the school’s own admission arrangements.

Can a catchment area change from year to year?

Yes. The distance that secures a place depends on how many families apply, so it shrinks in a busy year and stretches in a quiet one. Last year’s cut-off is a guide, never a guarantee.

Does a sibling guarantee a place?

Not automatically, but nearly all schools rank siblings above distance, so a sibling link can secure a place well outside the normal catchment. Check the exact wording for how a school treats step- and half-siblings and whether the sibling must still attend.

Do sixth forms have catchment areas?

Not in the usual distance sense. Sixth-form and 16–19 admission is normally based on meeting entry requirements such as GCSE grades, with distance only used as a tie-break for an oversubscribed course. Check the individual sixth form’s entry criteria.

Where this connects

Catchment sits right next to the wider admissions process, covered in school admissions explained. For anything specific to your area, your local authority’s admissions pages are the authoritative source. When you are ready, start on the map to see how close your realistic options really are.

Ready to look? Search for schools near you →