What catchment can look like in practice
A catchment area is a geographical area defined in a school’s admission arrangements. A policy may give applicants living inside it priority over other applicants, define several priority areas or use residence as a condition for a particular route.
Distance is different: it is a measurement between specified points. It might rank children within a priority group or break a tie. The authority’s method could use a straight line or another published method; a phone’s driving-distance estimate is not a substitute.
In this invented example, Home A is inside the priority area and Home B is closer to the school but outside. If the policy ranks the inside-area category first, A may have priority over B despite the longer distance. Other policies can produce a different outcome.
What catchment does not mean
- Inside does not mean a reserved place
A child may still need to qualify academically. Where the priority group is oversubscribed, score or distance can decide between applicants.
- Outside does not always mean ineligible
Some schools consider outside-area applicants after other groups; some use more restrictive residence rules. Read the wording.
- A postcode is not always precise enough
Boundaries can split a road or postcode. Use the official address checker or ask the admission authority about the exact address.
How catchment fits into the admissions picture
| Layer | Question to answer |
|---|---|
| Academic eligibility | Has the child met the school’s selection requirements? |
| Priority category | Which published group contains this application? |
| Order within the category | Is it score, distance or another criterion? |
| Tie-break | What happens when applicants are otherwise equal? |
| Address verification | Which residence date and evidence must be satisfied? |
Do not assume siblings, living nearby or attending a local primary school create priority. They matter only where the policy includes them. Historical allocation distances can help explain previous demand, but a new cohort can produce a different boundary of offers.
Questions worth answering before you rely on a map
Open the determined policy and official boundary for your child’s Year 7 entry. Confirm whether the area refers to the school itself, a test region or another priority category. Those boundaries are not necessarily identical.
Record the date by which the child must live at the address, the evidence required and how a move or shared care is treated. A property purchase, tenancy agreement or intention to move may not satisfy the policy’s actual residence requirement.
Ask the admission authority about an ambiguous address.Quote the entry year, address and policy clause. Keep its written reply with the application record; do not rely on an estate agent’s description of a catchment.
If you are considering a move, read the full residence and verification rules before making a commitment. Geography alone does not remove score requirements or competition for places.
Where to go next
Use the admissions-policy guide to work through the school’s criteria. For an outside-area application, read getting into grammar school without catchment.
Keep the admissions calculation separate from the travel decision. A child may have admission priority but face an awkward journey—or live outside a priority area while having an easy commute. Check both before ordering CAF preferences.
A few more answers
Common questions
Does living in catchment guarantee a grammar school place?
No. Academic eligibility and oversubscription rules still apply. There may be more eligible children in a priority area than places.
Is catchment the same as distance from school?
No. Catchment is a defined area; distance is a measurement used under the policy. A closer address can fall outside an area while a farther one is inside.
Can we apply from outside catchment?
Sometimes. Read whether the policy permits it and how outside-area applicants are ranked. Being able to sit the test does not prove that an offer is likely.
Will moving house improve our priority?
Only if the new address meets the relevant policy’s residence dates and evidence requirements. A move does not guarantee an offer.
Official sources
Reviewed 28 Sept 2026. Check the published arrangements for your child’s entry year.