On 25 April 2024 the 4-year rule for planning enforcement in England was abolished by the Levelling Up and Regeneration Act 2023. For over 70 years, operational development — buildings, extensions, engineering works — was only subject to four years of enforcement exposure. From that date, the four-year rule ceased to exist. Everything is now subject to the 10-year rule. If you have seen the 4-year rule mentioned on a planning forum recently, in someone seeking advice or in a Facebook group, this is why it keeps coming up. Thousands of people are still operating on the assumption it exists.
Under Section 171B of the Town and Country Planning Act 1990, local planning authorities had a limited window to take enforcement action. The rule was: four years for operational development (buildings, extensions, engineering works, and the change of use of a building to use as a single dwelling house). Ten years for all other material changes of use. This meant that if you built an extension without planning permission and the council did not take enforcement action within four years, the development became immune from enforcement. You could apply for a Certificate of Lawful Existing Use or Development (CLEUD) to formalise that immunity.
The Levelling Up and Regeneration Act 2023 abolished the 4-year rule entirely. From 25 April 2024, a single 10-year enforcement window applies to all breaches of planning control in England. There is no longer a distinction between operational development and changes of use. Everything — extensions, new buildings, conversions, changes of use — is now subject to the same 10-year period before immunity from enforcement can be claimed. Wales retains the 4-year rule for operational development. This change applies to England only.
The 4-year rule does not simply disappear for existing situations. The transitional provisions in the 2024 regulations mean that the 4-year rule can still be relied upon in specific circumstances. If the breach of planning control occurred on or before 24 April 2024, the 4-year rule still applies — provided the breach has been in continuous existence for at least four years from the date it occurred. If the breach occurred on or after 25 April 2024, the 10-year rule applies from the outset. The critical question is the date the breach began — not the date you are making an application or being served an enforcement notice. If you have an extension or building that was put up before April 2024 and has been in existence for at least four years without enforcement action, you can still rely on the 4-year rule for that specific development. Get a Certificate of Lawful Existing Use or Development now rather than waiting.
If you are sitting on a development that was completed before 25 April 2024, the clock that was already running under the 4-year rule continues to run under the 4-year provisions. You do not lose your existing position. But for any new development carried out after 24 April 2024, you face a 10-year window before immunity can be claimed. This significantly increases the risk profile of unauthorised development. The financial and practical consequences of an enforcement notice after 9 years of a completed building are severe — because the council will require you to demolish it even after that period has passed.
If you have received an enforcement notice in 2024 or 2025 for a development that was carried out some years ago, the question of which rule applies turns entirely on the date the breach occurred. If the alleged breach began before 25 April 2024 and the council is now claiming it occurred more recently — or alleging the development was not substantially complete at that date — this directly affects your appeal strategy. Ground (d) of an enforcement notice appeal (that the time limit has expired) must be argued with reference to the correct legal framework for the date in question.
The planning history for your site tells you what the council already has on record — including any Planning Contravention Notices, site visits, correspondence, and the dates on which the council became aware of the development. This context is critical when assessing whether the time limit has run and what the council can and cannot do. We retrieve the complete planning history for any UK property using proprietary tools that access live portals directly, including legacy systems that standard searches miss.
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