How to search a site's planning history properly

Every English planning authority keeps a public register of applications, and it is the first place to look before buying a property whose use, extensions or permitted development rights you are relying on. A planning register search takes half an hour and answers questions a survey cannot: whether the loft conversion was ever approved, whether a condition removed permitted development rights, whether a section 106 obligation binds the land, and whether there is an unimplemented permission worth more than the building.

What the register must contain

The Development Management Procedure Order 2015 requires the authority to keep a register of applications, available for public inspection. It records the application and its plans, the reference number and dates, particulars of the decision, and details of related matters such as environmental impact assessment and planning obligations.

Alongside it sit two other registers that people forget. Enforcement notices and stop notices are recorded on a separate register kept under the Town and Country Planning Act 1990. And planning obligations and certain conditions appear as local land charges, which is why a conveyancing search picks up things the planning portal does not.

The registers are statutory. They are not a customer service, and the authority is not obliged to interpret them for you. Officers will usually help with a specific question about a specific reference, and will decline to tell you whether a building is lawful, which is a different exercise altogether.

Searching by address, reference and map

Start with the address, but do not stop there.

Historic entries are indexed by whatever the applicant wrote at the time, which may be a plot number, a former street name, a farm name, or something like "land adjacent to 14 Mill Lane". A property built in 1998 will have its original permission filed under the field it stood in, and the reserved matters approval may sit under a third description again.

So run four searches. The full address. The street name alone, with a date range. A map search, if the council offers one, drawing a box slightly larger than the site. And the neighbouring addresses, because applications affecting your boundary were made by somebody else.

Then widen the date range to the earliest the system allows and sort by date rather than relevance. The default result set on most council systems is narrower than people assume. Several restrict results to the last few years unless you override the dates, and none of them warns you that they have done so.

Records that predate the online system

Most council registers went online somewhere between the late 1990s and the mid 2000s. Before that the records exist on paper or microfiche and are usually not indexed by address at all.

Ask the planning support team what the online coverage actually starts from, in writing. Then ask what the pre-digital index looks like: some authorities hold a card index by street, some by application number and date only, and a few have digitised decision notices without the drawings.

Where the file matters, request it. A request under the Environmental Information Regulations 2004 carries a statutory deadline of 20 working days and covers planning records, which usually produces a faster answer than a general enquiry. Expect to pay a copying charge and to visit for anything bulky.

Original decision notices sometimes survive in the property's own deeds packet when nothing else does, so ask the seller's solicitor before concluding a permission never existed.

Decisions that are not on the register

The register records applications. It does not record development that needed none.

An extension built under permitted development leaves no trace unless the owner applied for a lawful development certificate. Demolition, agricultural operations, changes of use within a class and internal works are the same. That absence is not evidence either way, which is the single most important point here: nothing on the register does not mean nothing was built, and it does not mean what was built is unlawful.

Prior approval applications, by contrast, are recorded, as are certificates of lawfulness. Appeals are held by the Planning Inspectorate rather than by the council, and its casework records are the place to find the decision letter.

Where a use has to be established rather than inferred, the only formal route is a certificate of lawfulness under section 191 or section 192 of the 1990 Act. A register search builds the evidence for that application, it does not replace it. The search tells you what was applied for. The certificate tells you what is lawful now, which on a property that has changed hands several times are rarely the same question.

Building a history schedule for a site

Turn the search into a document rather than a browser tab full of PDFs.

1. List every application found, with reference, date, description as written, and decision.
2. Note the decision date and whether a time limit for implementation has expired.
3. Extract the conditions from each approval, flagging any that remove permitted development rights, restrict use or hours, or require something ongoing.
4. Record whether an obligation was entered into, and get the deed.
5. Mark each permission as implemented, partly implemented or unimplemented, with the evidence for that view.
6. Cross-check implementation against aerial imagery by date, council tax banding changes and the building's own fabric.
7. Note the gaps, and say what you did to close them.

That schedule is what a lender, a buyer's solicitor or a case officer will actually read, and it is the backbone of any later application. The detail of what the statutory register must contain is worth reading alongside it, because knowing what should be there tells you when something is missing.

What the search changes in practice

For an investor the schedule usually produces one of four findings.

A condition removing permitted development rights, which changes what can be done without a further application. An unimplemented permission with life left in it, which may be worth more than the asking price assumed. An obligation restricting occupancy or requiring a contribution on a future trigger. Or an enforcement history that explains why the vendor is selling.

Any of those alters the price or the plan, and two of them are commonly missed because the decision notice is read for the word approved and then closed. None of them appears in a homebuyer survey. And the first three are all findable in an afternoon by anyone willing to read a decision notice properly.

Feed the findings into the application when you make one. A Planning Statement that sets out the planning history accurately, including the awkward parts, reads as competent and saves the officer an afternoon. Getting it wrong, or omitting a refusal the officer will find in ten minutes, does the opposite.

Browse all 66 PlanScope report types and start a draft once the history is clear and you know what the next application needs.

This is general guidance, not legal advice. A lawful development certificate is the only formal way to confirm that works are lawful, so check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.