Evidencing a lawful use where the history is silent

Proving a lawful use with no planning history is a problem of evidence rather than of policy. Where a building has been used as offices, or as three flats, or as a builder's yard for twenty years without a permission on the register, the way to put that beyond argument is a certificate of lawfulness of existing use or development under section 191 of the Town and Country Planning Act 1990.

The council has no discretion in the matter. If the evidence shows, on the balance of probabilities, that the use is lawful, the certificate must be granted, whatever the officer thinks of the use in planning terms. That is the part investors find reassuring and councils find frustrating.

Why the lawful use has to be settled first

Everything downstream depends on it. The permitted change from Class E to residential requires the building to have been in the relevant use for a set period. Whether an intensification needs consent depends on what the baseline use actually is. The fallback position that supports a redevelopment argument is worthless if the fallback cannot be evidenced.

A purchase price built on an assumed use is exposed in exactly the same way. Lenders increasingly ask the question, and a certificate is the only answer that survives due diligence.

Start by identifying the planning unit, because the certificate has to describe a use over a defined area of land. A shop with two flats above may be one unit or three, and the reasoning behind how councils decide what they are assessing determines how the application is framed.

Where the burden sits

The applicant carries it. The council is not required to disprove anything, and an application that leaves the officer to fill in the gaps will be refused.

The standard is the balance of probabilities, which is lower than people assume. And there is a further point that applicants often miss: the applicant's own evidence, if precise and unambiguous, can be enough on its own. Where the council has no contrary evidence, it is not entitled to refuse merely because the account is uncorroborated. That principle comes from a well-known planning appeal authority and it is quoted in the guidance.

Precise and unambiguous is doing the work in that sentence. "The flats have been there as long as I can remember" fails. "The first floor was converted to two self-contained flats in 1998 and has been let continuously since, as shown by the tenancy agreements at exhibit C" succeeds.

Documents that carry weight

Rank the evidence by how hard it would be to fabricate.

• Council tax banding records and business rates entries, which show the property as separately assessed units and carry dates.
• Tenancy agreements, rent books and letting agent statements, ideally a continuous run rather than samples.
• Utility accounts showing separate supplies, and meter installation records.
• Accounts, VAT returns and trading records for a commercial use.
• Building control records, fire risk assessments and licence applications, including HMO licences.
• Insurance schedules describing the property and its use.
• Correspondence with the council about anything else, which often records the use in passing.

A continuous run beats a thick bundle. Four tenancy agreements spread evenly across the period do more than forty from one year.

Where the use is a commercial one whose classification is itself contested, the evidence has to establish the character of the activity as well as its existence, which is the difficulty behind cases like self storage and which use class applies.

Statutory declarations and how to draft them

A statutory declaration is a formal statement made under the Statutory Declarations Act 1835, sworn before a solicitor or commissioner for oaths who is independent of the matter. It costs very little and carries real weight because making a false declaration is an offence.

Draft it properly and it does most of the work in the application.

1. Identify the deponent, their address and their connection to the property, including the dates of that connection.
2. Set out the history chronologically, year by year, with dates as precise as the deponent can honestly give.
3. Describe the use in factual terms: how many units, what activity, what hours, how many staff, what happened in the building.
4. Exhibit the documents referred to, labelled and cross-referenced in the text.
5. Confine it to what the deponent personally saw or did. Hearsay weakens the whole document.
6. Deal with the gaps openly rather than glossing over them.

Two or three declarations from different people, covering overlapping periods, are stronger than one long one. Former tenants, a neighbouring business owner, a retired employee and the previous owner are the usual sources. Ask early, because people move and memories fade.

Aerial imagery, directories and the gaps between them

Historic aerial photography and street-level imagery are useful for operational development and for site layout, and less useful for use, because a photograph shows a building rather than what happens inside it. Where the use has a visible signature, such as vehicles, stock, signage or an extract flue, the imagery becomes evidence of activity rather than of appearance.

Trade directories, archived business listings and old advertisements help date a commercial use. Electoral roll entries help with residential occupation. Ordnance Survey revisions date physical changes.

Assemble these as a timeline rather than as an appendix. A single page showing each year from the start of the period with the evidence available for it lets the officer see the continuity at a glance, and shows you where the thin years are before they do.

What breaks continuity

Two things defeat an application that otherwise looks strong.

The first is a break in the period. The relevant time limits run from the date the breach began and require the use to have continued. A vacancy of several months with the building secured is usually survivable; a change to some other use in the middle of the period restarts the clock.

The second is abandonment. A use can be lost where the physical condition of the building, the length of non-use, any intervening use and the owner's evident intentions together show the use has gone. An empty, derelict building with a collapsed roof and no attempt at reletting for a decade will not support a claim to its former use, however well documented that use once was.

Enforcement time limits changed under the Levelling-up and Regeneration Act 2023, which moved England towards a single ten year period for most breaches, with earlier breaches treated under the previous rules. Check which regime applies to your dates before you set the period you are trying to prove.

Making the application

The application goes to the council on the certificate form with a plan, the evidence bundle and a statement setting out why the use is lawful. There is a fee, and for an existing use certificate it matches what would be payable for a planning application for the same development.

Write the covering statement as an argument, not as an index. State the use claimed, the planning unit, the date the use began, the period relied on, the legal basis and then the evidence that supports each element. A Planning Statement in that form gives the officer a document they can adopt.

If the council refuses, the appeal is to the Planning Inspectorate and is decided on the same evidence, so the quality of the original bundle determines the outcome twice. A granted certificate is conclusive unless it was obtained by false or misleading information, which is a criminal matter.

Once the lawful use is fixed, the next question is usually whether the intended change needs consent at all, and intensification of an existing use or a conversion such as retail to residential above a shop follows from the baseline you have just established. PlanScope drafts the supporting statement in minutes and flags every fact it does not hold. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.

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