Lawful development certificate: sections 191 and 192

A lawful development certificate is the only formal way to establish that something is lawful in planning terms. It is not a planning permission and it grants nothing. It records a legal fact: that an existing use, operation or breach of condition has become immune from enforcement, or that a proposed use or operation would not require permission. Councils determine these applications on evidence and law alone, with no room for planning merits.

For a landlord or a conversion investor, that makes the certificate the document that closes a sale, satisfies a lender and ends an argument about whether a house is lawfully in multiple occupation.

What a certificate does and what it proves

Section 191 of the Town and Country Planning Act 1990 covers the existing position. An applicant can seek a certificate that an existing use of land is lawful, that operations already carried out are lawful, or that a use or operation in breach of a condition has become lawful through the passage of time.

Section 192 covers the proposed position. Here the question is whether a described use or operation would be lawful if carried out, which usually means whether it falls within permitted development or outside the definition of development altogether.

A certificate under either section is conclusive for the purposes it states, provided the description matches what is actually done. That last qualification does real work. A certificate for a use described as a six-bedroom house in multiple occupation does not protect an eight-bedroom operation, and one describing an outbuilding of stated dimensions does not protect one built larger.

Section 191 or section 192

The choice follows the facts on the ground.

Use section 191 where the thing already exists and you are relying on time or on the historic lawfulness of the use. Typical cases are a small house in multiple occupation that has operated for years, an annexe occupied independently, a business run from a yard, or a condition that has been breached continuously.

Use section 192 where nothing has happened yet and you want the council to confirm the position before you spend money. Typical cases are an outbuilding at the limits of Class E, a loft conversion in a house where the permitted development position is arguable, or a change of use said to fall within the same use class.

A section 192 certificate is a considerable comfort to a lender and to a buyer's solicitor, and it removes the risk that a later officer takes a different view of the same drawings.

Who carries the burden of proof

The applicant does, and the standard is the balance of probabilities. The council is not required to disprove the case, and if the evidence leaves the position uncertain the application fails.

National guidance makes a point that applicants often miss: the applicant's own evidence, if sufficiently precise and unambiguous, can be enough on its own. Corroboration is not a legal requirement. What defeats applications is vagueness, gaps in the period, and accounts that conflict with the documents.

The council can and does test the evidence. It may check council tax records, its own enforcement files, aerial photography and street imagery, and it may take the neighbours' accounts into consideration where they contradict the applicant. Where the evidence is challenged and the certificate is refused, the appeal is to the Planning Inspectorate on the law and the facts.

The evidence that persuades

Build the file around a continuous period, not a collection of moments. For a use case, the aim is to show the use began on a date, continued without material interruption, and has continued to the date of the application.

• Sworn statutory declarations from the applicant and from independent witnesses, each stating what the person saw, when, and how they know.
• Tenancy agreements, rent books and licence records, with the room counts and dates visible.
• Council tax and utility bills across the full period, including the gap years people forget.
• Dated photographs, ideally showing the building and something that fixes the date.
• Delivery records, insurance schedules, business accounts and bank statements showing continuity of trade.
• Aerial imagery and historic mapping for operational development.

Two habits raise the success rate. Put the evidence into a dated schedule so the officer can see the period covered at a glance, and address the weak years explicitly rather than hoping they are not noticed. A statutory declaration explaining a six-month void between tenancies is far better than a silent gap.

For a section 192 application, the evidence is drawings instead. Scaled plans, sections and elevations with dimensions marked against the relevant limits, plus a statement working through each condition of the permitted development class in turn. A short planning statement structured clause by clause makes the officer's decision straightforward.

Fees and timescales

The fee for a certificate for an existing use is the same as the fee for a planning application for that development. For a proposed use it is half that figure. Both sit in the national fee regulations and are indexed annually, so take the current amounts from the published schedule.

The determination period is eight weeks, and there is no statutory consultation requirement, though some councils notify neighbours in practice. A refusal or a non-determination can be appealed, and the appeal is decided on whether the applicant has made out the case in law.

Note that a certificate is not a permission, so it does not carry conditions and it does not expire. That also means the Community Infrastructure Levy is engaged differently: development carried out under permitted development can still be levy-liable through a general consent, so check the position rather than assuming a certificate puts you outside the charge. Read the mechanics of how levy liability arises before starting work.

When a certificate is worth more than permission

Three situations recur for landlords and investors, and in each of them a certificate does something a permission cannot.

Where a use has become immune from enforcement, a certificate records that immunity permanently. Applying for planning permission instead would invite conditions, and might attract a refusal that muddies the title.

Where a scheme is being sold or refinanced, a certificate answers the enquiry that holds up completion. Lenders are increasingly unwilling to lend against an unconfirmed permitted development position, particularly for houses in multiple occupation and for conversions.

Where an enforcement notice is a live risk, a certificate application forces the council to state its position on the evidence rather than leave the threat hanging. It is not risk-free, since the application tells the council what you are doing, but a well-evidenced case is usually better made early.

The evidence rules changed for breaches beginning after the enforcement time limits were amended by the Levelling-up and Regeneration Act 2023, so establish which period applies to your facts before assembling the file. Getting that wrong wastes the fee and tells the council where to look.

One caution on section 192. A certificate confirms the position as the law stands at the date of the decision, and permitted development rights can be removed afterwards by an Article 4 direction or amended by a change to the Order. In practice a certificate issued for a scheme you then build promptly is secure, while one obtained years ahead of the work is less so. If the project is on hold, keep an eye on whether the council is consulting on an Article 4 direction covering your street.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

Browse the report types on PlanScope to draft the supporting statement for a certificate application. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.