Important exceptions remain. [1][2]
The date and type of breach both matter
For building operations, the relevant event is substantial completion, not merely the date work began. For an unauthorised change to use as a single dwelling, the relevant event is when that change occurred. The transitional rules preserve the former position where those events took place before 25 April 2024. [2]
The distinction matters for a project spanning the changeover. Starting before 25 April 2024 does not itself establish that a later-completed building qualifies for the old four-year period. [1][2]
The basic categories
- Operational development substantially completed before 25 April 2024: the former four-year period can apply.
- Change to use as a single dwelling before 25 April 2024: the former four-year period can apply.
- Those categories from 25 April 2024 onwards: the normal period is ten years.
- Other breaches, including other changes of use and breaches of conditions: the general ten-year position must be considered. [1][2]
Do not use “four years for all building work” or “ten years from buying the house” as a shortcut. Establish the actual breach first.
Why age alone is not enough
Exceptions can allow further enforcement beyond the ordinary period, including relevant earlier enforcement action and deliberate concealment. Special controls, such as listed-building enforcement and relevant demolition in a conservation area, must not be treated as covered by a simple household time-limit rule. [1][2]
Nor does the normal period mean the council must wait that long before acting. It is a limit on ordinary enforcement in the qualifying circumstances, not a grace period for carrying out unauthorised work. [2]
How to establish lawfulness
Where you need formal confirmation that existing development is lawful, consider an existing lawful development certificate. The applicant must supply sufficiently precise evidence, and the assessment is based on legal and factual questions rather than whether the design is attractive or acceptable on planning merits. [3]
Build an evidence schedule identifying the work or use, when the relevant event occurred and the documents supporting that account. Dated photographs, records and other evidence should be consistent; one document with an address on it does not necessarily prove the nature and duration of the development.
What this does not resolve
Planning lawfulness does not certify compliance with building regulations or settle every other legal requirement affecting the work. Keep the planning evidence and technical approval records separate. [3][4]
If a notice has been served, obtain advice on its deadline and available grounds immediately. Do not wait for a certificate application or an anniversary while an enforcement deadline passes. [5]