Temporary stop notice: an immediate halt to works

A temporary stop notice is the fastest instrument in the enforcement toolkit. Served under section 171E of the Town and Country Planning Act 1990, it takes effect as soon as it is displayed on the site, prohibits the activity it names, and requires no prior warning, no consultation and no appeal process. A contractor who turns up to find one pinned to the hoarding must stop that day. Carrying on is a criminal offence.

It is also a temporary measure. The notice buys the authority time to decide what to do next, and what it does next is usually an enforcement notice.

What the notice does

Section 171E allows a local planning authority to issue a temporary stop notice where it thinks there has been a breach of planning control and that the activity, or part of it, should cease immediately. The notice must specify the activity prohibited, state the authority's reasons, and be displayed on the land along with a copy served on the person carrying out the activity and anyone else the authority considers has an interest.

Three features make it different from anything else in Part VII of the Act.

It bites on display, not after a notice period. It does not require an enforcement notice to have been served first. And there is no right of appeal to the Planning Inspectorate against it, so the only direct challenge is judicial review.

Note the word activity. A temporary stop notice prohibits doing something. It cannot require you to undo something, which is the job of an enforcement notice.

When an authority can serve one

The threshold is low by design. The authority needs to think that a breach has occurred and that immediate cessation is expedient. It does not have to prove the breach, and it does not have to have concluded its investigation.

In practice they appear where irreversible harm is in progress: demolition of an unlisted building in a conservation area, engineering operations stripping a site, the felling of hedgerows or trees during the breeding bird season, an unauthorised use starting up over a bank holiday weekend when nobody can be reached.

Authorities also use them tactically, to stop a developer racing to complete works before an enforcement notice can take effect. That is a legitimate use, and it is the reason the power exists.

How long it lasts and what comes next

The notice runs for a fixed maximum period from the date it is first displayed. It was originally 28 days. The Levelling-up and Regeneration Act 2023 extended the maximum period in England, so check the current text of section 171E on legislation.gov.uk rather than relying on the older figure.

The authority may withdraw it sooner. It cannot serve a second temporary stop notice for the same activity once the period has expired, unless it has taken some other enforcement action in the meantime. That restriction is what makes the notice truly temporary rather than a rolling prohibition.

What follows is one of four things. An enforcement notice, with its own compliance period and its own appeal rights. A breach of condition notice, where the problem is a condition on an existing permission. An invitation to submit a retrospective application. Or nothing, where the investigation concludes there was no breach after all.

That last outcome matters, because it is also where compensation becomes live.

Activities that cannot be stopped

Regulations limit what a temporary stop notice may prohibit, and the restriction that matters most is that it cannot prohibit the use of a building as a dwellinghouse. A council cannot use section 171E to empty a house of its occupants while it works out whether the conversion was lawful.

There have been restrictions relating to residential caravans as well, and the position on those has changed over time. Check the current regulations rather than an old summary.

The notice also has to be precise about what it prohibits. A notice that bans "all development on the site" is vulnerable, because the recipient cannot tell whether maintaining site security, making the works safe or complying with another statutory duty is caught. Where the drafting is unclear, ask the authority in writing to confirm what is and is not prohibited, and keep the reply.

Compensation exposure

Section 171H provides for compensation, and it is narrower than developers hope but wider than authorities like.

Compensation is payable for loss or damage directly attributable to the prohibition in specified circumstances: broadly, where the activity turns out not to have been a breach of planning control, and where the authority withdraws the notice other than following the grant of planning permission for the activity. The detail sits in the section itself and in the regulations, and the claim procedure has time limits.

Two practical consequences follow. For the authority, compensation risk is why officers take legal advice before serving, and why notices are drawn narrowly. For the developer, the possibility of a claim is a reason to record losses from day one: standing time for plant and labour, extended preliminaries, delay costs under the building contract, and any liquidated damages exposure downstream.

Keep that record even if you expect to lose the argument on the merits. Evidence assembled contemporaneously is worth far more than a reconstruction six months later.

Offences and penalties

Contravening a temporary stop notice is an offence, and so is causing or permitting the contravention. It can be tried in the magistrates court or on indictment, and on conviction the court is required to have regard to any financial benefit that has accrued or is likely to accrue as a result of the offence.

That last point is the sharp end. Where the activity was profitable, the fine is set against the benefit rather than against a fixed scale, which is why the economic logic of carrying on and paying a penalty does not work the way people expect.

There is a defence where the notice was not served on the defendant and they did not know, and could not reasonably have been expected to know, of its existence. Displaying the notice on site is what closes that defence off, which is why display matters procedurally.

Distinguishing the three notices

The practical difference for a developer is that a stop notice is part of a process that can be appealed, through the enforcement notice it accompanies. A temporary stop notice is not part of any process you can appeal, which is precisely why it is short.

An illustrative example

A developer with outline permission for six houses starts stripping topsoil and removing a boundary hedge in late May, before reserved matters are approved. A neighbour calls the council. An enforcement officer visits, forms the view that the hedgerow removal is a breach and that active bird nests are at risk, and a temporary stop notice is displayed the same afternoon prohibiting vegetation clearance and earthworks. The developer stops, takes ecological advice, and the authority follows up with a request for an ecological survey and a revised programme. This example is illustrative and not drawn from a decided case.

Responding without making it worse

Stop first. Argue second. The offence is complete on contravention, and nothing you later prove about the merits undoes it.

Then work through this order:

1. Photograph the notice in position, with the date, and take a full set of site photographs recording the state of the works.
2. Read the prohibited activity precisely and instruct everyone on site in writing about what has stopped.
3. Ask the authority, in writing, to confirm the boundary of the prohibition where anything is ambiguous, including safety and security works.
4. Establish the factual position on the alleged breach and get the planning history, including any conditions that may have been triggered.
5. Start the cost record for a possible compensation claim.
6. Decide the route: regularise by application, correct a condition problem, or prepare for the enforcement notice appeal that is probably coming.

Where the problem is a drafting or detail mismatch between what was approved and what is being built, the fix may be smaller than it looks. A section 96A non-material amendment deals with minor divergences, and a section 73 application deals with conditions. Where a full retrospective application is needed, the determination period can be extended by agreement, and extension of time agreements are worth understanding before you sign one under pressure.

Build the retrospective case properly. The evidence that should have accompanied the original application is what resolves the situation now, and working out which of the supporting documents apply is the first step. 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. Enforcement carries criminal liability, and you should take advice from a qualified professional on the facts of your case rather than relying on a general article. Enter your postcode on PlanScope to see which reports your site needs.