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Use a 404 Page Acceptance Checklist for Website Redesigns

Test missing routes, helpful recovery links, analytics, status codes, and consistent branding before launch.

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**Published: September 1, 2026**

A friendly missing-page design can conceal a routing problem if valid pages also fall into it or if the server returns the wrong status. Review the 404 experience as both a user recovery path and a technical response.

Separate appearance from route behavior

Specify the message, navigation options, search or contact path, visual treatment, and analytics event. Then define which requests should produce the page. Known moved content belongs in the redirect map, while genuinely missing addresses should return the appropriate not-found response.

Test representative missing addresses

  • Request a random path that never existed.
  • Check a removed page from the migration inventory.
  • Try a malformed nested route and an asset address.
  • Confirm the response code with a network or command-line tool.
  • Manage risk and ownership

    Do not redirect every missing address to the homepage. That hides useful diagnostics and gives visitors no explanation. Ensure the error page itself does not request missing assets or trap keyboard focus.

    Define acceptance

    Keep evidence of status codes, recovery links, mobile layout, analytics behavior, and redirect exceptions. Assign an owner to review frequently requested missing URLs after launch.

    Further reading

    Read the related guide

    Read the related guide

    Source

    GOV.UK Service Manual

    Frequently asked questions

    Who should own this record?

    A named client owner should approve business rules and access. The outsourced team maintains implementation detail and supplies repeatable evidence.

    When should the team review it?

    Review it before implementation, at acceptance, and whenever a related service, policy, account, or production component changes.

    Does a template prove the work is complete?

    No. The completed record must match the implemented website and be supported by checks that another reviewer can repeat.

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