Budgeting a lawful development certificate application

A lawful development certificate costs less in fees than most people expect and more in evidence than almost anyone budgets for. The fee for a certificate of proposed use or development under section 192 of the Town and Country Planning Act 1990 is half what a planning application for the same thing would cost. The lawful development certificate cost that actually hurts is the six weeks of someone's time spent assembling tenancy agreements, council tax records and dated photographs for a section 191 application about a use that started eleven years ago.

Budget the two halves separately, because they behave differently.

The difference between existing and proposed certificates

Section 191 gives a certificate of lawfulness of existing use or development. You are proving something that has already happened: a use that has run long enough to be immune from enforcement, works substantially completed outside the time limit, or a breach of condition that can no longer be enforced against.

Section 192 gives a certificate of lawfulness of proposed use or development. You are asking the council to confirm that something you have not yet done would be lawful, usually because it falls outside the definition of development or within a permitted development class.

The difference matters for budgeting because the burden of proof sits on the applicant in both cases, but only a section 191 application requires historical evidence. A section 192 application is an argument about law applied to drawings. One is an archive project and the other is a legal opinion.

Neither is decided on planning merits. The council cannot refuse a certificate because it dislikes the scheme, and it cannot attach conditions. That is the structural advantage of the route, and it is why landlords use it before buying rather than after.

How the fee is calculated for each type

The fees are set by the Town and Country Planning (Fees for Applications, Deemed Applications, Requests and Site Visits) (England) Regulations 2012, as amended, and they follow a simple pattern.

National planning fees were uplifted in December 2023 and are now subject to annual indexation each April, so take the current figure from the fee schedule on GOV.UK rather than from an older quote. Exemptions are narrow and do not generally extend to certificates, which is a different position from the one that applies to fee exemptions for disabled adaptations.

One practical trap. Where an existing use involves more than one planning unit, or where the certificate covers both a use and operational development, the fee calculation can produce more than one component. Ask the council's validation team to confirm the figure in writing before you submit, because an underpaid fee stops the clock and the eight-week period does not start until the application is valid.

Evidence gathering as the real cost

For a section 191 application the evidence is the application. The decision-maker applies the balance of probability, and the applicant's own account can be enough if it is precise, unambiguous and uncontradicted. Vague recollection fails.

What councils accept, in rough order of weight:

• tenancy agreements and rent books covering continuous periods, with names and dates
• council tax records and banding history, especially where a property was banded as more than one unit
• utility bills showing separate supplies or meter installations
• electoral roll entries for separate occupiers
• dated photographs, ideally with metadata, and aerial imagery
• building control records, completion certificates and licences, including HMO licences
• invoices, bank statements and contractor records for the works
• Land Registry title plans and historic title entries

Gaps are what kill applications. A tenancy from 2014 and another from 2022 does not prove continuity through 2017. Fill the gap or explain it, because the officer will notice it before you do.

Budget this as time rather than as a fee. Somebody has to request records, chase former tenants, redact personal data and build a chronology. On a straightforward single-unit case that is a day or two. On a multi-unit conversion with changing tenants it is regularly four to six weeks of elapsed time, and the person doing it is usually you.

Statutory declarations and who prepares them

A statutory declaration is a sworn statement of fact. For the applicant and for each supporting witness, a declaration carries materially more weight than an unsworn letter, because making a false declaration is a criminal offence.

The oath is administered by a solicitor, a commissioner for oaths or a notary, and the charge for administering it is small and fixed. The cost sits in the drafting. A declaration has to be specific about dates, addresses, rooms, rents and the declarant's own knowledge, and a solicitor's time is billed by the hour.

Three declarations from a landlord, a long-standing tenant and a neighbour who can speak to continuous occupation are worth more than ten letters. Get the chronology agreed first, then draft once.

Surveys, invoices and photographic records

Operational development cases need measurements. Where the certificate concerns a building, an extension or a change in floor area, a measured survey tied to a datum removes the argument about whether the thing on the ground matches the thing on the plan.

Keep the paper trail from the works themselves: skip hire, scaffold, building control inspections, the electrician's certificate, delivery notes with dates. A single dated invoice for roof trusses can establish substantial completion more cleanly than six photographs.

Photographs need provenance. An undated print proves nothing. A photograph with embedded date and location data, or one that can be tied to a dated event, is evidence. Aerial imagery held by the council and by national mapping services is often the lowest-cost way to establish what existed in a given year.

Refusal and the appeal route

If the council refuses, or grants a certificate in different terms from those applied for, there is a right of appeal to the Secretary of State under section 195. The appeal is almost always dealt with by written representations, which keeps the cost down.

The deadline is stated on the decision notice and should be checked there rather than assumed. The appeal is a rehearing of the lawfulness question on the evidence, so new evidence can be submitted, and often the appeal succeeds because the applicant finally produced the document the officer asked for.

Budget an appeal as a second round of the same evidence work plus drafting. There is no appeal fee for a certificate appeal, which changes the economics compared with running a weak application twice.

Where a certificate costs less than an application

Four situations where the certificate is the better buy.

1. A proposed use you believe needs no permission. A section 192 certificate at half fee confirms it, with no conditions and no expiry, where a planning application invites conditions you did not want.
2. A permitted development scheme a lender or buyer is nervous about. The certificate is the document the solicitor will accept.
3. An existing unauthorised use that is now immune. A certificate converts an enforcement risk into a lawful use, which changes the valuation.
4. A breach of condition you cannot comply with. A section 191 certificate about the condition can be the cleaner answer than an application under section 73, which is the same calculation discussed in the cost of a pre-commencement condition you cannot discharge.

Against that, immunity periods changed. In England the previous four-year periods were replaced with a single ten-year period by section 115 of the Levelling-up and Regeneration Act 2023, with transitional arrangements turning on when the breach occurred or the works were substantially completed. As at October 2026, check the date of your breach against the provision in force rather than relying on the old four-year rule.

An illustrative budget for a use certificate

Illustrative only, for a section 191 application on a single property where the use began around twelve years ago.

Fill the first column with figures you have in writing. Anyone quoting you a national average for an evidence-led application has not read the file.

For the supporting statement, a structured Planning Statement setting out the chronology, the legal test and the evidence index is the document that does the work, and PlanScope can draft one to that structure for review. See PlanScope pricing for the free report, the per-report price and the Professional tier, and browse the full list of report types if the certificate sits alongside a wider application.

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 works or uses are lawful. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.