If a loft conversion or extension was carried out without the required planning permission, the rules that determine whether the council can still take enforcement action changed in 2024.
Previously, there was a well-known “4 year rule”: unauthorised building work became immune from enforcement after 4 years of continuous use, while a change of use needed 10 years. As of April 2024, this was simplified. The rule is now 10 years for all types of unauthorised development across England, whether it’s a building, an extension, or a change of use. The old 4-year rule no longer applies.
This means if your loft conversion or extension was built without the necessary permission, the council generally has up to 10 years from completion to take enforcement action, rather than the previous 4. After that period, providing the work has been continuous and unchanged, it may be considered immune from enforcement, though this isn’t automatic.
If you think this might apply to your property:
- The work must have been completed and the space used continuously for the full 10-year period
- The use or structure must not have changed in nature during that time
- A claim alone usually isn’t enough. You’ll typically need evidence such as dated photographs, utility bills, or other records showing continuous use throughout the period
- It’s always worth applying for a Certificate of Lawfulness (the modern equivalent of what used to be called a Lawful Development Certificate for existing development) rather than relying on the rule informally. This gives you a legally recognised document confirming the work is lawful, which matters considerably if you come to sell
Transitional cases: if work was completed before April 2024 and would have already qualified under the old 4-year rule at that point, it generally remains protected under the previous rule. The 10-year rule applies going forward from the 2024 change. If you’re in this situation, it’s worth getting specific advice on your dates, since transitional cases can be more nuanced.
This is also a good moment to mention: unauthorised work isn’t something to build around or work into a future renovation hoping it goes unnoticed. If you’re planning further work on a property with existing unauthorised alterations, we’ll always flag this at survey stage so it can be resolved properly, either by regularising the existing work or factoring it into the new design.
Read our full guide to planning permission here.If you’re ready to sit back and enjoy a Simply Easy Refurb on your home, contact us today.
