The enforcement warning notice and how to respond

An enforcement warning notice is an invitation to apply for planning permission, served formally. It tells you that the authority considers there has been a breach of planning control, that it thinks there is a reasonable prospect permission would be granted if you applied, and that if you do not apply within the period stated it may take enforcement action.

It is not an enforcement notice. There is nothing to comply with, no works to undo, no deadline to stop a use and no offence in ignoring it. What it does is set a clock running on the authority's patience and create a written record that the breach was brought to your attention.

What an enforcement warning notice does

The power was added to the Town and Country Planning Act 1990 by the Levelling-up and Regeneration Act 2023, sitting with the enforcement provisions in Part VII of the Act. Check the current text and the commencement position for England on legislation.gov.uk, since the enforcement provisions of that Act were brought into force in stages.

The notice states that it appears to the authority that there has been a breach of planning control, identifies the breach and the land, states that there is a reasonable prospect that permission would be granted on an application, and specifies the period within which an application should be made.

That middle element is the interesting one. An authority serving this notice is telling you, in writing, that it thinks your development is probably acceptable. That is a useful document to hold when you come to make the application.

The circumstances in which it is served

Three situations produce one in practice.

An unauthorised change of use that nobody has complained about but an officer has noticed, where the use would probably be acceptable on its merits. A building or extension built without permission that broadly accords with policy. And a breach of condition where the condition could reasonably have been varied.

Officers reach for it instead of an enforcement notice where the outcome they want is a regularised development rather than its removal. Before the power existed they wrote a letter saying the same thing, and the letter had no status. The notice gives the step a statutory footing and a date.

It is not used where the development is plainly unacceptable. If the authority wants the building down, you will get an enforcement notice.

What it requires of the recipient

Nothing, in the strict sense. There is no obligation to apply and no penalty for declining.

What the notice asks for is a retrospective application. For development already carried out, that is an application under section 73A of the Town and Country Planning Act 1990, which allows permission to be granted for development already undertaken, or for the retention of buildings or continuance of a use without complying with a condition.

The practical considerations are the fee, the documents, and whether applying is actually in your interest. A householder or small landlord receiving one of these should work through four questions before filling in a form:

• Is there in fact a breach, or is the development outside planning control altogether
• Has the breach already become immune through the passage of time
• If an application is made and refused, what is the position then
• Is a lawful development certificate the better application to make

The first question is not rhetorical. Officers get characterisation wrong, and whether works amount to development at all turns on the statutory definition, as our note on operational development under section 55 sets out.

What happens if no application follows

The authority may then take enforcement action in the ordinary way, meaning an enforcement notice specifying the breach, the steps required to remedy it and the period for compliance.

An enforcement notice carries a right of appeal to the Secretary of State, and the appeal grounds include that planning permission ought to be granted. So declining to apply does not forfeit the argument about acceptability, it moves the argument into an appeal where the authority has already committed itself in writing to the view that permission would probably be granted.

An appeal takes longer, costs more and carries a risk of a costs award if the authority can show unreasonable behaviour. For a development the authority has already indicated it would permit, applying usually costs less and takes less time than being enforced against and appealing.

There is no right of appeal against an enforcement warning notice itself, because there is nothing to appeal. If you think the authority is wrong about the existence of a breach, the route is correspondence followed by a lawful development certificate application, not an appeal.

Relationship with other enforcement tools

The notice most often confused with this one is the planning contravention notice, which is a demand for information and does carry an offence for failing to respond. If the document in your hand asks you questions you must answer, it is a contravention notice rather than a warning notice. Read the heading.

Record of the notice

Authorities maintain registers of enforcement action, and an enforcement warning notice may be recorded and may show up on a local authority search. Ask the authority what it records and where.

That matters on a sale or a refinance, because a buyer's solicitor reading a record of enforcement action will want an explanation and, often, an indemnity or a retention. Regularising the development usually removes the problem more cleanly than explaining it does.

Keep your own file too: the notice, the date of receipt, any correspondence, and the dated evidence of when the development was carried out.

How to respond sensibly

A sequence that works:

1. Diarise the period stated in the notice, and reply within a fortnight acknowledging receipt and stating what you intend to do.
2. Establish the date the breach began, with documentary evidence, and check the immunity position before anything else.
3. Ask the authority in writing what it considers the breach to be, in precise terms, and which policies it has in mind.
4. Decide between a retrospective application under section 73A, a lawful development certificate application, or doing nothing and reserving the argument for an enforcement appeal.
5. Where you apply, treat it as a full application rather than a formality: drawings that match what exists, and a short Planning Statement addressing the policies the authority identified.
6. Where the development could be modified to improve its prospects, propose the modification in the application rather than waiting to be asked.
7. Keep the notice and the authority's written view of acceptability with the application papers.

Step seven is the one people overlook. An authority that has stated in a notice that permission would probably be granted has made your case harder to refuse, and that statement belongs in the file in front of the committee or the inspector.

The supporting document set for a retrospective application depends on what was built and where, and the report types grouped by category shows what a council is likely to ask for.

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