Injunctions to restrain a breach of planning control

A planning injunction is a court order requiring someone to stop, or not to start, development that breaches planning control. The power sits in section 187B of the Town and Country Planning Act 1990: where a local planning authority considers it necessary or expedient for an actual or apprehended breach to be restrained, it may apply to the court, whether or not it has used or intends to use any of its other enforcement powers. Only the authority can apply. A neighbour cannot, however strongly they feel about what is happening next door.

When an authority goes to court

Most breaches are dealt with by an enforcement notice, which costs less, moves more slowly and does not involve lawyers standing in front of a judge. An injunction is reserved for situations where a notice will not do the job.

Four patterns recur. Works that would cause irreversible harm, such as the demolition of a historic building or the felling of protected trees, where waiting for a notice to take effect means the harm has already happened. Breaches that are being repeated by someone who has already ignored notices. Development that is anticipated rather than under way, where machinery has arrived on site and nothing has yet been built. And cases where the identity of the person responsible is unclear, so a notice served on an occupier achieves nothing.

The word "apprehended" is doing real work in the section. It allows an authority to act before the breach occurs, which is the only useful moment in a demolition case.

The test the court applies

The court does not simply enforce the authority's view. It exercises its own discretion, and the House of Lords set out how in South Bucks District Council v Porter. The judge has to consider all the circumstances, including the personal circumstances of the person against whom the order is sought, and has to be satisfied that granting the injunction is proportionate.

That means an authority has to show more than a breach. In practice the questions are these.

1. Is there a breach, or a real prospect of one?
2. How serious is the planning harm, and is it reversible?
3. Have the other enforcement powers been tried, or would they be ineffective?
4. What are the consequences for the defendant, including family circumstances, health, and whether they have anywhere else to go?
5. Would the order be enforceable in practice, given that breach means contempt of court?

The fourth question is the one that defeats applications. Where the defendant is a family living on a site without permission and there is no alternative accommodation, a judge may decline an injunction even where the breach is plain, because imprisonment for contempt would be a disproportionate outcome. That reasoning is well established and authorities know it, which shapes which cases they bring.

Injunctions against persons unknown

Where the authority cannot identify who is responsible, or wants an order that binds people who have not yet arrived, it may seek an injunction against persons unknown. The courts have confirmed that they can make orders binding "newcomers", while attaching safeguards.

The protections the courts expect include a strong justification, a clearly defined geographical scope, a limited duration with a review date, proper advertisement of the order so those affected can learn of it, and a route for an affected person to apply to vary or discharge it.

Those safeguards matter to anyone who finds that land they use is covered by such an order. The order will say how to apply to the court about it, and the authority must be able to show it was publicised in a way that would reasonably come to the attention of those bound by it.

Relationship with enforcement notices

An injunction is an addition to the enforcement toolkit, not a replacement for it. Section 187B says expressly that the power can be used whether or not other powers have been used.

Parallel powers exist elsewhere. Breaches of listed building control can be restrained by injunction under the Planning (Listed Buildings and Conservation Areas) Act 1990, and unauthorised works to protected trees can be restrained under the tree provisions of the 1990 Act. The listed building route matters because unauthorised works to a listed building are already a criminal offence, and an injunction can stop them in progress rather than punishing them afterwards. Where the issue is heritage harm more generally, the statutory balance described in our note on heritage harm refusals and the statutory balance is the policy framework the court will hear about.

What happens if an injunction is breached

Breach of an injunction is contempt of court, and the sanctions are those available for contempt: a fine, sequestration of assets, or committal to prison for up to two years.

The authority has to bring committal proceedings, prove the breach to the criminal standard, and satisfy the court that the defendant understood the order. Courts suspend committal orders fairly often, giving a defendant a last opportunity to comply, which is a reminder that the point of the exercise is compliance rather than punishment.

For a resident watching an unauthorised development continue after an order was made, the practical step is to report it to the authority's enforcement team with dates, photographs and a description of what is happening, because the authority has to prove the breach and contemporaneous evidence is what proves it.

Costs and who pays

Injunction proceedings are expensive. The authority instructs solicitors and usually counsel, and the losing party is normally ordered to pay the winner's costs.

That cuts both ways. An authority that seeks an injunction and loses can face a substantial costs order from public funds, which is one reason applications are made selectively. A defendant who loses may face the authority's costs on top of the cost of complying with the order.

Legal aid may be available to individuals in some circumstances, particularly where a home is at stake. Anyone served with an application should take advice immediately rather than attending a hearing unrepresented.

Why the power is used sparingly

Three reasons, and none of them is reluctance to enforce.

Cost and uncertainty, as above. The breadth of the court's discretion, which means an authority cannot be confident of the outcome even on strong facts. And the fact that most breaches are remediable through the ordinary route, where the authority controls the process rather than handing it to a judge.

So the realistic expectation for a community group pressing an authority to seek an injunction is that the authority will first use a notice, and will consider court action only where the harm is urgent and irreversible or the breach is persistent. Making the case for urgency, with evidence, is more productive than asking for an injunction by name. Where an appeal is running in parallel, the position of third parties is covered in our note on third party involvement in someone else's appeal, and inspectors' reasoning on comparable breaches can be useful background, as our note on using appeal decisions in a planning application explains.

As an illustrative example, a parish council learning that a locally listed barn in a conservation area is to be demolished over a weekend would achieve more by telephoning the conservation officer and the enforcement team on the Friday, with photographs and the registration of the plant on site, than by writing a letter asking for an injunction. The authority can seek an order against an apprehended breach. It cannot do so without knowing in time.

This is general guidance rather than legal advice. Anyone involved in injunction proceedings, on either side, should take advice from a solicitor. For background on the documents that support a planning application, browse the report types by category. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.