Certificate of lawfulness (existing use)

What a CLEUD is

A certificate of lawfulness of existing use or development (CLEUD) is a legal document confirming that an existing use, operation, or state of affairs is lawful.¹ Lawful means planning permission is not required, either because the development was authorised or because it is now immune from enforcement.

CLEUDs are commonly used to regularise unauthorised development that has become immune through the passage of time, or to confirm that old planning permissions were properly implemented.

The 10-year rule for changes of use

Unauthorised changes of use become immune from enforcement after 10 years of continuous use.² The 10-year period starts when the change of use began, not when the council discovered it.

The use must be continuous. Breaks or interruptions reset the clock. For example, if a building was used as a workshop for 8 years, then left vacant for 2 years, then used as a workshop again, the 10-year period starts from the most recent resumption of workshop use.

The 10-year rule applies to material changes of use. Changes within the same use class are not material and do not require immunity (they were never unauthorised).

Evidence required

The burden of proof is on you to demonstrate that the use has continued for 10 years. Evidence should be specific, dated, and reliable. Strong evidence includes:

• Business records (invoices, accounts, VAT returns, company returns filed at Companies House)
• Business rates records showing the use for 10+ years
• Advertising materials, websites, or trade directories listing the business
• Utility bills showing patterns of use consistent with the claimed activity
• Statutory declarations from you, employees, customers, and neighbours
• Dated photographs or videos showing the use
• Planning or building control records referencing the use

Statutory declarations must come from independent witnesses who have direct knowledge of the use. Councils may investigate declarations and will reject vague or inconsistent statements. Providing false information in a statutory declaration is perjury.

When to use a CLEUD

Apply for a CLEUD when:

• You have operated a business or residential use for 10+ years without permission and want legal certainty
• You are selling a property and the buyer's solicitor has raised questions about unauthorised use
• A lender requires confirmation that the use is lawful before approving a mortgage
• The council has indicated they may take enforcement action and you believe the use is immune

A CLEUD is not the same as planning permission. It confirms that permission is not needed. If your use has not yet reached 10 years, you cannot rely on immunity and should apply for retrospective planning permission instead.

Building operations and the 4-year rule

Building works become immune from enforcement after 4 years from substantial completion.³ This is a shorter period than the 10-year rule for changes of use. See our 4-year rule guide for full details.

CLEUDs are commonly used to confirm that extensions, outbuildings, or other structures are immune from enforcement because they were completed more than four years ago.

How to apply

CLEUD applications are submitted through the Planning Portal. You need:

• Location plan and site plan
• Plans or photographs showing the existing use or building
• Detailed evidence proving the use has continued for 10 years (or building completed 4+ years ago)
• Statement explaining why the use or building is lawful

The application fee is the same as a planning application for equivalent development. The council must decide within 8 weeks. They will either grant or refuse the certificate. They cannot impose conditions (lawfulness is binary: the use is lawful or it is not).

What if the application is refused?

If the council refuses a CLEUD, it means they do not accept your evidence that the use or building is immune from enforcement. You have three options:

• Appeal the refusal to the Planning Inspectorate (6-month time limit)
• Submit a fresh CLEUD application with stronger evidence
• Apply for retrospective planning permission

Refusal of a CLEUD does not automatically trigger enforcement action, but it indicates the council's view that the development is unauthorised. If the council later serves an enforcement notice, you can appeal on grounds that the use is immune (but you will need to prove it).