Certificate of lawfulness for a proposed use or operation
Section 192 asks whether a proposed use or operation would be lawful, not whether it would be acceptable. The authority has no discretion to refuse on the merits, and the onus of proof is on the applicant.
A lawful development certificate for a proposed use answers a legal question, not a planning one. Section 192 of the Town and Country Planning Act 1990 lets anyone ask the local planning authority to confirm that a proposed use of land, or proposed operations on it, would be lawful if begun at the time of the application. If the authority is satisfied on the information provided, it must issue the certificate. It has no discretion to refuse because it dislikes the proposal.
That distinction is the whole value of the procedure, and it is also its limit. A section 192 certificate cannot tell you whether something would get permission. It tells you whether it needs any.
What the certificate actually does
The certificate records that the described use or operations would be lawful. Lawfulness here means one of four things: the activity is not development at all under section 55, it is permitted development under the General Permitted Development Order, it falls within an existing planning permission, or the change of use is not material.
Once issued, the lawfulness of what is described is conclusively presumed. A lender, an insurer, a buyer's solicitor and a future enforcement officer all have to accept it. That presumption is what makes the procedure worth the fee for anyone whose plans depend on a borderline reading of the permitted development rights.
The presumption has one condition attached. It falls away if there is a material change, after the date of the application and before the use begins or the operations start, in any of the matters relevant to lawfulness. An Article 4 direction made in the interval, or an amendment to the relevant permitted development class, removes the protection.
So a certificate is not indefinite. Act on it.
The two certificates, and which one you need
Section 191 covers existing uses, operations and breaches of condition, and the question there is immunity: has the time for enforcement passed, so that no enforcement action may now be taken. It is a historical evidence exercise, and the applicant has to prove what happened and when.
Section 192 covers proposed uses and operations, and the question is prospective. No history is needed, because nothing has happened yet. What is needed is a legal analysis of the proposal against the current planning position.
Applicants confuse the two routinely, and the consequence is a refusal on the wrong basis. If the HMO has been let to five sharers since 2016, a section 191 application is the right one. If you are about to start letting to five sharers, it is section 192.
How the authority decides
The onus of proof sits with the applicant, and the standard is the balance of probabilities. National guidance on lawful development certificates is explicit that an applicant's own evidence does not have to be corroborated by independent evidence, and that where the authority has nothing to contradict it, the applicant's evidence alone can be enough.
What that means in practice is that the quality of the submission determines the outcome. The authority is not going to build your case for you, and a thin application gets refused rather than queried.
Three features distinguish the procedure from a planning application. There is no publicity or neighbour notification requirement, so the process is private. There is no planning merits assessment, so design, amenity and highways are irrelevant. And the fee for a proposed use certificate is half the fee that would be payable on a planning application for the same development, rather than the full amount charged on an existing use certificate. Fee levels are indexed, so check the current schedule.
Determination is within eight weeks. A refusal, a partial refusal, or a failure to decide gives a right of appeal to the Secretary of State under section 195.
An illustrative example
Take a landlord, illustrative only, with a three-bedroom terraced house currently let to a single family and proposed to be let to four unrelated sharers who share the kitchen and bathroom.
Four sharers takes the property from use class C3 to C4. Part 3 of Schedule 2 to the General Permitted Development Order permits a change from C3 to C4, so the change is permitted development and no planning application is needed. A section 192 certificate confirming that proposition gives the landlord something to hand the lender and something to rely on if the council's enforcement team knocks in three years.
Two things would change the answer. If the borough has made an Article 4 direction withdrawing that permitted development right for the area, the right is gone and the certificate has to be refused. And if the plan is for seven sharers rather than four, the use is a large house in multiple occupation, which is not within C4 and falls outside the permitted development route entirely.
The certificate also has to describe the right thing. A description reading "use as a house in multiple occupation" is worse than one reading "use as a dwellinghouse within use class C4, occupied by no more than six residents living as a single household and sharing basic amenities". The second describes something the Order permits. The first does not say which.
What it is often confused with
A section 192 certificate is not planning permission. It grants nothing and implies no approval of the merits.
It is not a certificate of immunity from listing, which is an entirely separate application to the Secretary of State confirming a building will not be listed for five years.
It is not building regulations approval. A loft conversion can be lawful for planning purposes and still fail Part B.
It is not a pre-application response. A pre-application enquiry gives you an officer's non-binding view on whether permission would be granted. A certificate gives you a binding statement that none is needed. Both have their place and they answer different questions.
And it is not a substitute for a licence. An HMO licence under the Housing Act 2004, a premises licence, or a pavement licence are separate regimes, and a planning certificate does not touch them.
Putting the application together
Six elements make up a submission that works.
- A precise description of the proposed use or operations, drafted in the language of the use classes or the relevant permitted development class.
- A site location plan and, where operations are proposed, drawings showing exactly what will be built.
- The legal basis, stated expressly: the section 55 argument, the class of the Order relied on with its conditions and limitations addressed one by one, or the permission relied on with its drawing numbers and conditions.
- Confirmation that no Article 4 direction applies to the land, with the source of that confirmation.
- Confirmation that the building is not listed and the land is not within a conservation area or other designated land, where either affects the right relied on.
- The planning history, including any condition on a past permission that removes the right you are relying on. Conditions withdrawing permitted development rights are the single most common reason a section 192 application fails.
Where the proposal turns out to need permission after all, the analysis you have already done is most of a Planning Statement, and the other documents the application will need depend on the site, which the report index sets out by category.
One warning
Knowingly or recklessly making a false or misleading statement, or withholding material information, to procure a certificate is an offence under section 194. The authority can also revoke a certificate under section 193 where it was obtained on a false statement or with material information withheld.
Revocation is rare. A revoked certificate on a property you have refinanced against is a bad position to be in, so disclose the inconvenient condition rather than hoping it is not spotted.
Note: permitted development rights and Article 4 coverage both change, and a certificate reflects the position at the date of application. The planning law updates timeline is a reasonable place to follow changes.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. If the answer turns out to be that permission is needed, enter your postcode on PlanScope to see which reports the site is likely to require. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
What is the difference between a section 191 and a section 192 certificate?
Section 191 covers existing uses, operations and breaches of condition, and asks whether enforcement is now time-barred, which is a historical evidence exercise. Section 192 covers proposed uses and operations, and asks whether they would be lawful if begun now, which is a legal analysis against the current planning position.
Can the council refuse because it dislikes the proposal?
No. The question is legal, not one of planning merits, so design, amenity, parking and neighbour objections are irrelevant. If the authority is satisfied on the information provided that the described use or operations would be lawful, it must issue the certificate. A refusal or deemed refusal carries a right of appeal under section 195.
How long does a certificate last?
The conclusive presumption of lawfulness falls away if there is a material change, after the date of application and before the use begins or the operations start, in any matter relevant to lawfulness. An Article 4 direction made in the interval, or a change to the permitted development class relied on, removes the protection. So act on it.
What does a section 192 application cost?
The fee for a proposed use certificate is half the amount that would be payable on a planning application for the same development, as against the full equivalent fee for an existing use certificate. Fee levels are indexed annually, so take the figure from the current fee schedule rather than from an older application.
Why do these applications get refused?
Most often because a condition on an earlier permission withdrew the permitted development right being relied on, because an Article 4 direction applies, or because the description does not match a class in the Order. Thin applications are refused rather than queried, since the onus of proof sits entirely with the applicant.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.