What to submit for a certificate of lawful existing use

On an application for a certificate of lawfulness of existing use or development, the applicant carries the burden of proof. The council does not have to disprove your case, and if the evidence leaves a genuine doubt the certificate is refused. So the lawful development certificate evidence you assemble has to be self-proving: a bundle an officer can read once, follow without asking questions, and grant on.

The standard is the balance of probabilities, not beyond reasonable doubt. That is a lower bar than people fear, and it is still a documentary exercise rather than a matter of recollection.

What the certificate does and does not do

Section 191 of the Town and Country Planning Act 1990 allows an application for a certificate that an existing use, an operational development, or something done in breach of a condition, is lawful. Section 192 covers proposed uses and development, which is a different application answering the question whether permission is needed.

A certificate under section 191 is conclusive as to what it states, as at the date of the application. It is not a planning permission, so it grants nothing and authorises no change. Nor does it cure anything outside its wording: a certificate for use of a building as three flats says nothing about external alterations carried out at the same time.

Two practical limits matter. A certificate is specific to the use, the land and the date, so a later intensification or change can take the position outside it. And a certificate obtained by false statement or by withholding material information can be revoked, which is why a bundle that is selective is worse than one that addresses the awkward facts head on.

For a landlord refinancing a converted property, the certificate is often the only document a lender will accept.

The burden of proof and how authorities apply it

The applicant must show, on the balance of probabilities, that the use or development has subsisted for the relevant period without a material break.

Officers approach it by looking for gaps. A continuous run of documents with a two-year hole in the middle invites the question of what happened in those two years, and the answer "it carried on as before" without a document is the commonest reason for refusal.

What tends to persuade:

• Documents created at the time for another purpose, which carry more weight than anything prepared for the application.
• A continuous chain rather than a sample, with at least one dated item for every year of the relevant period.
• Consistency between sources, so that the tenancy dates match the council tax records and the utility accounts.
• Frankness about breaks, with an explanation and whatever evidence supports it.

Where the council holds contrary evidence, for example an enforcement file or a complaint record, it will use it. Ask for the planning history and any enforcement record before you apply, so you are not surprised by it.

Evidence that establishes continuous use

Build the bundle from records that were made for other reasons.

1. Council tax and business rates records, including banding history and any valuation office correspondence, which are strong because a third party created them.
2. Tenancy agreements, assured shorthold tenancies, licences and rent books, with a schedule showing continuity between them.
3. Utility accounts and supply records for each unit, which are powerful where separate supplies were installed.
4. Bank statements or accounts showing rental receipts, redacted as necessary.
5. HMO licence records, gas safety certificates, electrical installation condition reports and fire alarm servicing records, each of which is dated and unit-specific.
6. Electoral roll entries by unit, where the authority will confirm them.
7. Aerial and street-level imagery across the period, dated, showing physical features such as separate doors, parking and bin storage.
8. Insurance schedules describing the property as converted or in multiple occupation.
9. Builders' invoices, building control records and completion certificates for the works that created the use.

Arrange them chronologically, not by type. An officer following a timeline can see continuity. An officer handed nine folders by category has to construct the timeline themselves, and may not.

Statutory declarations and what they are worth

A statutory declaration made under the Statutory Declarations Act 1835 is sworn evidence and authorities take it seriously. On its own, though, it rarely carries an application.

The useful declaration is specific and verifiable. It names the person, states how they know the facts, gives dates and addresses, describes the use in concrete terms, and refers to the documents exhibited to it. A declaration saying "the property has been flats since the 1990s" is close to worthless. One saying "I was the letting agent for 14 Example Street from March 2009 to September 2016, during which the building was let as four self-contained flats, as shown in the tenancy schedule at exhibit A" is evidence.

Get declarations from people with no financial interest where you can: former tenants, a neighbour, a retired letting agent, a tradesperson who serviced the boilers. A declaration from the applicant is admissible and expected, and it is strongest when the documents do the work and the declaration explains them.

Time limits and the effect of reform

The relevant periods used to be four years for operational development and for a change of use to a single dwellinghouse, and ten years for other changes of use and for breach of condition.

The Levelling-up and Regeneration Act 2023 provides for the four-year period to be replaced by ten years, so that a single ten-year period applies. Commencement and the transitional position determine which period applies to your facts, and that is exactly the point to check against the current legislation and guidance rather than assuming. Where a use became immune under the old four-year rule before any change took effect, the immunity already acquired is not lost, but the analysis depends on dates.

Note that deliberate concealment can defeat immunity, because a planning enforcement order can be sought where a breach has been deliberately concealed. An application that depends on a use nobody could see is more difficult, not easier.

Get the dates right to the month. The relevant period runs back from the date of the application, so a bundle that stops 14 months before submission leaves a gap at the most important end.

Preparing a bundle that proves itself

Structure it so that a decision can be made without a second request for information.

Start with a short statement of case: what use is contended, on what land, from what date, and why it is lawful. Then a chronology table with one row per year, the evidence for that year, and the document reference. Then the documents, numbered and indexed, in the same order as the chronology. Then the statutory declarations, each exhibiting the documents it refers to. Then a plan with the land edged red and, where the use differs between parts of the building, a floor plan with each unit identified.

Two more points of craft. Draft the certificate wording you want granted and include it, because an authority often adopts it and an imprecise certificate is worth much less than a precise one. And describe the use in planning terms, with the use class where one applies, rather than in commercial language.

Where the works alongside the use also need regularising, deal with them in the same application or in a parallel one, because a certificate for the use leaves unauthorised building work exposed. A Planning Statement setting out the planning history and the statutory test alongside the bundle is what pulls the whole thing together, and where an unauthorised outbuilding is caught up in it, the pack described in the note on documents for a swimming pool building in a rear garden shows what a fresh application would need. Site constraints can surface at that point too, including the easements covered in the note on documents for a site crossed by a public sewer.

The fee is set in the fee regulations and differs from a planning application fee, and it is indexed annually, so check the current schedule. The determination period is eight weeks, and there is a right of appeal against refusal.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. A Lawful Development Certificate is the only formal way to confirm that an existing use or development is lawful.

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