How far back can planning permission be enforced?

The relevant planning authority can take action against you for any missing planning permission within: 4 Years - for building, engineering, mining or other operations in, on, over or under land. 4 years - for the change of use of a building, or part of a building, to use as a single dwelling house (i.e. converting your property into multiple flats). 10 years - for all other developments. After this, any alteration becomes lawful, in terms of planning.

What is the penalty for building without planning permission?

In most cases, if your property is missing planning permission, you might be asked to put things back as they were (i.e. demolition or restoration). You can appeal against this decision or the refusal of permission, however if this is unsuccessful and you still refuse to comply, you can get prosecuted.

Property sitting on incomplete house plans. SAM Conveyancing's guide on buying or selling a house with missing planning permission

You might be able to avoid remedial action being taken against you.

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Missing Planning Permission

by:

Andrew Boast

Last Updated: 10/06/2026

Read by:

5,501

5 min read

Key Takeaways

Missing planning permission can sometimes cause problems for homeowners. There are different solutions for this, depending on whether you're buying or selling.
You can request retrospective permission, although if this is rejected, you will need to restore the property to its original state.
If 4 years have passed after the works and you were unaware you were committing a planning breach, you can apply for a Lawful Development Certificate.

1

Selling a house without planning permission

What happens if you didn't get planning permission?

Making changes to your property without getting planning permission from the Local Planning Authority is classed as a 'planning breach'. This applies in instances where:

permission has not been granted, yet the works are still carried out
permission has been granted with certain conditions and one or more of those are broken

Certain minor works carried out on properties do not require planning permission, as they fall under the permitted development rights, although some conditions may be imposed. Some seemingly minor works may still require planning permission, such as changing the windows. Permitted developments do not apply to flats, maisonettes or listed buildings.

Can you get in trouble for not getting planning permission?

A planning breach is not always illegal, therefore it cannot always get you into trouble. In most cases, you will be asked to undo all your work. However, problems arise when the breach occurs after the planning application has already been rejected. In this case, you might suffer serious legal consequences.

Can you sell a house that doesn't have planning permission?

Issues arise when you start to consider selling a house without planning permission. Any potential buyers may be put off by the missing permission and they may not want to take on the risk. You could benefit from solving this before trying to sell and thankfully, there are a few solutions.

The easiest would be to get retrospective permission, but this could take too long and if the application is rejected, you will be forced to restore the property to its original condition. This would cause you to lose your buyers. If the works have been completed for a number of years, you might be covered by the 'no planning permission 4 year rule'.

What is the 4 year rule in planning permission?

The 'no planning permission 4 year rule' rule protects you if you've built an extension more than 4 years ago, without realising you were committing a planning breach.

If no remedial action has been enforced within that time limit, the local planning authority may no longer have the right to do so. However, the Levelling-up and Regeneration Bill, which is currently under debate in the House of Commons, aims to extend this to 10 years.

What you can do if you're covered by the 4 year rule is apply for a 'Lawful Development Certificate' (LDC). This is an official certificate which states that no enforcement action can be taken against the development referred to in the certificate. The LDC will no longer be valid if you make any further changes to that development without getting planning permission.

Doing this ensures that if you're ever interested in selling a house without planning permission, the new owner will not face legal consequences because of it.

2

Buying a house without planning permission

What happens if you buy a house that doesn't have planning permission?

Once your offer is accepted, the seller will have to provide all the necessary information and proof of permission in the Property TA6 Form. Alternatively, if you're not sure how to find old planning permission on the property, you can always get a planning report as an additional conveyancing search.

If you buy a house with missing planning permission, you will become liable for it. Should the planning authority enforce any remedial action, you will be responsible for restoring the property back to its original state, which could devalue it and cause you to suffer financial losses.

However, if you're buying a house without planning permission for extension, for example, there are ways you can ensure you will not inherit the liability. Before exchange of contracts you can ask the seller to do either of the following:

Get retrospective permission - if the application is rejected, however, remedial action will be enforced by the planning authority.
Get a Lawful Development Certificate - as mentioned above, if the seller was unaware that they needed planning permission and more than 4 yours have passed, this certificate will make the extension (or any relevant work) lawful.
Get indemnity insurance for you

Either way, you could use this opportunity to negotiate the asking price. We give you tips on how to do this in our article - How to negotiate house price.

If you're buying using a mortgage, you might find that buying a property without planning permission is difficult. Your lender might refuse to grant you the mortgage or they might impose several conditions for you.

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Written by: Andrew Boast

Andrew Boast FMAAT is a qualified accountant, conveyancing specialist and author with over 25 years of experience in the UK property sector. Since beginning his career in 2000 within established SRA and CLC-regulated conveyancing solicitor firms, Andrew has overseen the legal journeys of more than 75,000 clients.

He is the self-published author of the first-time buyer guide: How to Buy a House Without Killing Anyone, and a frequent contributor to mainstream UK media on legislative updates, property law, first-time buyer guides, conveyancing best practices, and stamp duty changes. Andrew specialises in resolving complex title issues, property conflict disputes, and property tax options, streamlining the enquiry process to reduce transaction times and maintaining a client-friendly focus.

Reviewed by: Amanda Ambler

Amanda Ambler is a highly accomplished conveyancing specialist with over 15 years of dedicated experience across residential property law, legal compliance, and practice management. Having held senior roles, including Head of Legal Practice and Head of Conveyancing at established UK law firms, Amanda possesses a profound, hands-on understanding of the technical intricacies of the property market.

As the designated Legal Content Reviewer for SAM Conveyancing, Amanda ensures that every guide, legal update, and resource published meets the absolute highest standards of accuracy, regulatory compliance, and factual integrity. Her rigorous review process guarantees that complex property legislation and industry processes are communicated clearly, transparently, and safely for home buyers and sellers alike.

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