Certificate of Lawfulness

You may have heard about the 4 year rule in planning.  Well now it is a 10 year rule in planning. However in certain circumstances the 4 year rule still applies (keep reading)

A Certificate of lawfulness is a legal document stating the lawfulness of past, present or future development. You might need a lawful development certificate if you are using a property for a prolonged period of time without planning permission or need to establish that the current use of the building is indeed lawful.

There are two types of Certificate that can be applied for –

• Certificates of Lawful Existing Use or Development (CLEUD or CLUED) — for something already built or already happening. That is what this page covers
• Certificates of Lawful Proposed Use or Development (CLOPUD) — for something you propose to do. See our separate guide to the certificate of lawfulness of proposed use or development

The planning merits raised by these applications are not for consideration. It is simply a matter of evidence, fact and legal consideration.

If you need a certificate of lawfulness, we urge you to make contact ASAP so that we may assist you. The clock is often ticking on these.

 

What is a Certificate of Lawfulness?

A Certificate of Lawfulness is a legal document issued by the local planning authority (LPA) that is generally used to regularise unauthorised development and prevent enforcement action being taken against any breach of planning policy or conditions. Importantly this is not retrospective planning permission.

The certificate establishes that an existing use, operation or activity named in it is lawful and as such cannot be enforced upon. This might be valuable in the event of selling the property or taking a mortgage on it etc. A common use might be to obtain a lawful development certificate after erecting an extension built under permitted development to prove that it is legal. Another common case is where a planning condition was never dealt with and so after 10 years action could no longer be taken by the local authority.

It can also be used to establish if a current use of the building is legal. For example to establish if the current use of the building is legal as offices.

Refusal does not mean that the development is unlawful. It may simply mean that insufficient evidence has been presented so far, or that planning permission is required (assuming the decision is correct). You can also appeal against refusal to issue a Certificate of Lawfulness — and unusually, there is no time limit for doing so, in contrast to most planning appeals. Contact us for help.

If what you want to establish is whether something you propose to do would be lawful — confirming that an extension or dormer meets the General Permitted Development Order 2015 (as amended) before you build it, for instance — that is the other certificate. See our guide to the certificate of lawfulness of proposed use or development. Planning Geek can assist with either.

 

Evidence for a Lawful Development Certificate

Quite a bit of evidence is required for a certificate of lawfulness. This might include Sworn Affidavit (former and current owners, neighbours etc.), Photos (ideally dated in some way), Satellite Images, ASTs for HMOs, Rental agreements, Council Tax Records, Utility Bills, Invoices for items supplied, Certificates (gas, electric etc.), Service or repair bills, Electoral Register, Accounts, Building Control Final Inspection Certificate, Valuation tax letter (VOA), Environmental health records, Vehicle registration documents, Builders or other trade invoices, Leases, Previous planning decisions, Timeline of tenants over 10 period for HMOs. The more evidence the better. Not all these items are required however. Some might not be applicable. There may also be other evidence.

A fee is payable for a certificate of lawfulness — see our guide to planning fees in England. It is worth weighing that, and the evidence-gathering effort, against whether you actually need the certificate at present: less is often more, and the usual triggers are a sale, a mortgage or a genuine enforcement risk rather than curiosity.

You will need to supply a location plan to the correct scale. Some local authorities may need existing floor plans and elevations depending upon the application. We can assist with these if required.

The burden of proof is on the applicant and the Courts have held that the relevant test of the evidence on such matters is “the balance of probability“. If a local planning authority has no evidence itself, nor any from others, to contradict or otherwise make the applicant’s version of events less than probable, there is no good reason to refuse the application.

We would recommend some or all of the following bits of evidence: statutory declarations, sworn affidavits, utility bills, service/repair bills, invoices, council tax payments, dated photos, electoral register, accounts and more….One further change is worth knowing if you end up appealing. The Secretary of State can now dismiss an appeal against a refusal where the appellant is causing undue delay in progressing it. Gather your evidence before you appeal, not during.

 

Certificate for extant planning

You might need to prove that you made your planning extant within the three years on a full planning application decision. A certificate of lawfulness can be applied for to support the planning. Planning Geek can assist with that.

 

Enforcement Notice

Can you apply for a LDC if an enforcement notice has been issued? Section 191(2) of the Town and Country Planning Act 1990 states that a use or operation is not lawful where there is an enforcement notice and as such an lawful development certificate cannot be issued. However if the enforcement notice is being appealed or has been sent to the Secretary of State for redetermination then the enforcement notice is not in force (see this page) and so a lawful development certificate could be applied for.

 

Four year or ten year rule for a Lawful Development Certificate?

In most cases it is now 10 years, however provided that the works were substantially complete before 25th April 2024 a four year period may still apply.  This is often confused and therefore it might be best to give a few examples:

• Use of an outbuilding as a separate single dwelling – 4 years if works were substantially complete before 25th April 2024
• Construction of a single dwelling (C3) – 4 years if works were substantially complete before 25th April 2024
• Extension of an existing building – 4 years if works were substantially complete before 25th April 2024
• Conversion of a building to a single holiday let – 4 years if works were substantially complete before 25th April 2024
• Conversion of a commercial building to a single dwelling (C3) – 4 years if works were substantially complete before 25th April 2024
• Construction of a new building of the same use within the site, provided the designation of the land wasn’t changed – 4 years if works were substantially complete before 25th April 2024
• New fences, gates, walls etc. – 4 years if works were substantially complete before 25th April 2024
• Use of a building as an HMO (C4 or Sui Generis) – 10 years at all times
• Commercial use of a barn for a non-agricultural use – 10 years at all times
• Change of use (except to a dwelling) – 10 years at all times
• Conversion of agricultural land to garden land – 10 years at all times
• Breach of conditions – 10 years at all times, unless it relates to a residential item which is covered under the 4 year rule. As confirmed by First Secretary of State v Arun District Council and Brown [2006] and works were substantially complete before 25th April 2024

There are in fact two limbs to the surviving four year rule. For building, engineering or other operations, it applies where the works were substantially completed before 25th April 2024. For a change of use of a building to a single dwellinghouse, it applies where the breach occurred before that date.

If works are substantially complete on or after 25th April 2024 a ten year period will apply to all irrespective of what the alteration was.

One more point of geography: this change applies in England only. In Wales the four year rule remains the law.

 

Deliberate Concealment

Any current use of the building must be visible and in the open. There was a well publicised case of a farmer, Mr. Fidler (no we didn’t make the name up!) who built a large house behind an even larger stack of hay and then failed when he tried to use a lawful development certificate. It is important that you keep your property in open view at all times in order to qualify for a LDC.

 

Listed Buildings / Conservation Areas

Note that a lawful development certificate cannot be used in situations where breaches of listed building or conservation area controls may be alleged. Therefore the 4 / 10 year rule will not apply.

There is a separate certificate for listed buildings, but only for works you propose to carry out — see our guide to the certificate of lawfulness of proposed works under section 26H.

 

Names, abbreviations and what they actually mean

A Certificate of Lawfulness (COL) goes by many names — Lawful Development Certificate (LDC), CLEUD, CLUED, CLOPUD and more. The abbreviations are used loosely and often interchangeably, but they are not all the same thing:

• CLEUD (or CLUED) — existing use or development, under section 191. This page
• CLOPUD — proposed use or development, under section 192. Different test, different rules — see our guide to the certificate of lawfulness of proposed use

If someone tells you they need “a COL”, it is always worth establishing which one they mean.

For further information you are welcome to consult the Government guidance on lawful development certificates or contact Planning Geek and we will assist. It is important to get the application correct.

Relevant legislation

The certificate regime and the enforcement time limits it depends on sit in the main planning Act, as amended in 2024. When checking any provision, use the “Changes to Legislation” panel on legislation.gov.uk, as later amendments are not always shown in the main text.

• Town and Country Planning Act 1990, section 191 — the certificate for existing use or development, and what “lawful” means
• Town and Country Planning Act 1990, section 171B — the enforcement time limits: ten years in England, four in Wales
• Town and Country Planning Act 1990, section 193 — procedure, and the limits on what a certificate covers
• Town and Country Planning Act 1990, section 195 — appeals against refusal or non-determination
• Levelling-up and Regeneration Act 2023, section 115 — replaced the four year rule with ten years in England from 25 April 2024

Other Planning Application Sections

 

Certificate of Lawfulness page updated: 15th July 2026