Use section 191 for an existing situation
Section 191 of the Town and Country Planning Act 1990 concerns existing uses, operations and failures to comply with conditions. Section 192 concerns proposed uses or operations. Choosing between them depends on the situation being certified, not simply whether the applicant owns an older building.
An existing development might be lawful because it already had permission, complied with permitted development rights or became immune from enforcement. Describe the precise legal basis. The wider lawful development certificate guide explains the distinction between certification and obtaining planning permission.
Build an evidence case rather than a design argument
The applicant must substantiate the claim on the balance of probabilities. Relevant evidence can include dated photographs, tenancy documents, invoices, utility records and statements from people with direct knowledge. No single document should be assumed to establish every element of the case.
Organise evidence around the disputed facts: commencement, substantial completion, the nature of occupation or continuity of use. Explain gaps and conflicting records openly. A favourable planning description or an assertion that neighbours never complained does not establish lawfulness, and council tax records alone may not prove the claimed planning use.
Apply the England enforcement transition correctly
From 25 April 2024, a ten-year enforcement period generally applies to most breaches of planning control in England. The transition preserves the former four-year period for operational development substantially completed before that date and a change of use to a single dwellinghouse begun before that date. The Planning Inspectorate's explanation of the changes describes when the new period applies.
Other changes of use and breaches of condition generally already attracted a ten-year period. Identify the correct category and relevant starting event before calculating anything. An invoice date is not necessarily evidence of substantial completion or the beginning of the claimed residential use.
Lawful development certificate drawings
- Existing and proposed floor plans of the house
- Existing and proposed elevations showing heights and materials
- A location plan and a site or block plan with boundaries
Check exceptions before claiming immunity
Elapsed time is not an automatic amnesty. Existing enforcement action, statutory exceptions and the history of the alleged breach can affect whether immunity has arisen. Deliberate concealment can engage special enforcement mechanisms and requires careful legal assessment rather than a simple calendar calculation.
Listed building controls and other statutory regimes are not resolved by assuming ordinary planning enforcement periods apply. Review notices, decisions and the complete property history. The government's enforcement guidance explains enforcement powers and exceptions; obtain specialist advice where concealment, interrupted use or previous enforcement is involved. Check the applicable legal position with the local planning authority.
Match the drawings to the claimed development
A certificate needs an identifiable subject. Plans should define the land, buildings or parts of buildings covered and distinguish the claimed use from neighbouring or ancillary areas. Where the evidence concerns a historic configuration, explain its relationship to the current layout.
Lawful development certificate drawings support that identification but cannot replace missing historical evidence. Avoid an application description broader than the facts justify. A certificate for one defined use or operation does not establish that every alteration elsewhere on the property is lawful.
Distinguish certification from retrospective permission
A retrospective planning application asks whether development should receive permission on its planning merits. A section 191 application asks whether the specified existing situation is already lawful. Strong evidence of age is not a substitute for policy justification where retrospective permission is required.
Our page on retrospective planning applications covers that separate route. Refusal of a certificate means the submitted claim has not been established; it does not itself grant permission or settle every possible legal argument. Building regulations, private rights and other consents also remain separate.
This guide is general information only and does not replace advice on your specific property. Rules can change, so always check the current position before starting work.
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Frequently asked questions
Does paying council tax prove a dwelling is lawful?
No. It may support a chronology, but planning lawfulness depends on the actual use, relevant legal test and full evidence. Tax treatment is not planning permission.
Does every old extension qualify after four years?
No. The transitional four-year rule concerns operational development substantially completed before 25 April 2024. Later completion generally attracts ten years, and exceptions or enforcement history can affect the position.
Can a certificate cover only part of a property?
Yes. Its description and plans should precisely identify the land, use or operations certified. Areas outside that scope are not automatically covered by the decision.
Can inaccurate evidence undermine a granted certificate?
Yes. A certificate can be revoked where materially false or misleading information was supplied, or material information withheld. Check statements and supporting documents carefully rather than treating approval as protection for an inaccurate account.