Boundary Review

A review of parliamentary constituency boundaries.

Also used as: boundary reviews, constituency boundary review, parliamentary boundary review, boundary changes

Source / explainer: Read the UK Parliament explainer on constituencies

Last reviewed: 3 August 2026

A boundary review is a process for reviewing and recommending changes to parliamentary constituency boundaries. Boundary reviews are intended to keep constituencies broadly up to date with population and electorate changes while taking account of relevant rules and local factors. They matter because changes to boundaries can alter which constituency voters are in.

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