Planning enforcement is the process by which local planning authorities (LPAs) investigate and remedy breaches of planning control — development that has been carried out without planning permission, or not in accordance with an approved permission. Understanding how enforcement works is important for homeowners who have inadvertently built without consent, for those concerned about neighbours’ developments, and for anyone dealing with an enforcement notice. Crown Architecture & Structural Engineering Ltd assists clients in responding to and resolving planning enforcement issues. This guide explains how the system works.

What is a Breach of Planning Control?

A breach of planning control occurs when:

• Development is carried out without planning permission (where permission was required)
• Development is carried out otherwise than in accordance with the terms of a planning permission (e.g. different design, materials, or location from what was approved)
• There is a failure to comply with a planning condition
• There is an unauthorised change of use

Not every breach of planning control is “development” in the legal sense. Minor internal works, maintenance, and certain categories of change do not constitute development and cannot be enforced against regardless of whether permission was obtained.

Enforcement Is Discretionary

An important and often misunderstood principle: enforcement action is discretionary. The LPA is not required to take enforcement action against every breach. It must consider whether it is “expedient” to enforce — taking into account the planning merits of the breach, its harm to amenity, and the public interest. Many minor breaches that are not causing harm are resolved informally or not pursued.

This means that if you have built without permission, the LPA may choose not to take action — particularly if the development would have been approved had permission been sought and it is causing no harm to neighbours or the environment.

The Enforcement Process

Step 1: Complaint or Investigation

Enforcement investigations typically begin with a complaint from a neighbour, member of the public, or a referral from another council department. The LPA investigates by inspecting the site, reviewing records, and seeking an explanation from the owner.

Step 2: Informal Resolution

In many cases, the LPA will attempt informal resolution first — writing to the owner, requesting a retrospective planning application, or negotiating modifications to the breach. This is the most common resolution for householder breaches.

Step 3: Planning Contravention Notice (PCN)

If the LPA cannot establish the facts of the breach informally, it may serve a Planning Contravention Notice requiring the owner to provide information about the development, its use, and when it commenced. Failure to respond or providing false information is an offence.

Step 4: Enforcement Notice

If the LPA decides to take formal enforcement action, it serves an Enforcement Notice. An Enforcement Notice:

• Identifies the alleged breach of planning control
• Requires steps to be taken to remedy the breach (e.g. demolish the building, discontinue the use, remove the works)
• Specifies a compliance period (the time given to take the required steps)
• Becomes a local land charge registered against the property

An Enforcement Notice takes effect 28 days after service (unless appealed). Non-compliance with an Enforcement Notice that has taken effect is a criminal offence and can result in an unlimited fine.

Step 5: Appeal Against an Enforcement Notice

You have the right to appeal an Enforcement Notice to the Planning Inspectorate within 28 days of service. An appeal suspends the notice until determined. Grounds of appeal include:

• Planning permission ought to be granted for the development
• The alleged breach has not occurred
• The development is lawful (immune from enforcement — see below)
• The notice was not properly served
• The compliance period is too short

An enforcement appeal is determined by a planning inspector, who can dismiss the appeal (upholding the notice), allow the appeal (quashing the notice), or allow the appeal and grant planning permission for the development.

Enforcement Immunity (Time Limits)

There are statutory time limits beyond which enforcement action can no longer be taken:

• 4 years: For unauthorised building operations (construction, engineering works) and for change of use of a building to a single dwellinghouse, the limitation period is 4 years from the date the operations were substantially completed or the change of use took place.
• 10 years: For all other breaches (change of use, failure to comply with a condition), the limitation period is 10 years.

Where the relevant time limit has passed, the breach becomes “immune” from enforcement. The owner can apply for a Certificate of Lawful Use or Development (CLUD) confirming the lawfulness of the existing development.

Stop Notices and Temporary Stop Notices

Where the LPA needs to stop development urgently, it can serve a:

• Stop Notice: Requires activity specified in a related Enforcement Notice to stop immediately. The LPA may be liable to pay compensation if the Stop Notice is subsequently quashed.
• Temporary Stop Notice (TSN): Can be served without a related Enforcement Notice and takes immediate effect for up to 28 days. Used where urgent action is needed (e.g. damage to a heritage asset or protected tree).

Breach of Condition Notices

Where a planning condition has not been complied with, the LPA can serve a Breach of Condition Notice (BCN) requiring compliance within a specified period (minimum 28 days). Non-compliance with a BCN is a criminal offence. Unlike Enforcement Notices, BCNs cannot be appealed to the Planning Inspectorate — the only route of challenge is through the High Court (judicial review).

Retrospective Planning Permission

Where development has been carried out without permission but would be acceptable under current planning policies, the LPA may resolve an enforcement matter by inviting a retrospective planning application (under Section 73A). If retrospective permission is granted, the enforcement breach is regularised. If refused, enforcement action is likely to follow.

How Crown Can Help

Crown Architecture & Structural Engineering Ltd assists clients who have received enforcement notices or planning contravention notices — assessing the planning merits of the breach, advising on retrospective application or appeal, and preparing the necessary planning and technical documents. Call us on 07443804841 to discuss an enforcement issue.

Frequently Asked Questions

Can my neighbour force the LPA to take enforcement action?

No. A third party cannot compel the LPA to take enforcement action — it is a discretionary power. However, if the LPA decides not to act, a third party can challenge that decision by judicial review if the LPA has fettered its discretion or acted unlawfully. In practice, this is rare and expensive.

What is the difference between an Enforcement Notice and a Stop Notice?

An Enforcement Notice requires steps to be taken to remedy a breach within a compliance period (usually weeks or months). A Stop Notice requires specified activities to stop immediately. Stop Notices are typically used alongside Enforcement Notices where urgent cessation is needed.

I built my extension 5 years ago without permission — can I be made to demolish it?

If the extension was substantially completed more than 4 years ago and constitutes “building operations,” it is now immune from enforcement. You can apply for a Certificate of Lawful Use or Development (CLUD) to confirm its lawful status. You will need to demonstrate the date of substantial completion with documentary evidence.

Does an Enforcement Notice affect my ability to sell my property?

Yes. An Enforcement Notice is registered as a local land charge and will appear on any conveyancing search. Buyers and their solicitors will raise it as a matter requiring resolution. An outstanding enforcement notice makes a property difficult to sell and may affect mortgage lending. Resolving the enforcement issue (by complying with the notice, obtaining retrospective permission, or appealing successfully) is essential before sale.

Can I appeal an Enforcement Notice after 28 days?

No — the 28-day appeal window is absolute. If you miss it, you cannot appeal to the Planning Inspectorate. The only recourse after the notice takes effect is to comply, apply for retrospective permission, or challenge the notice in the High Court (judicial review, on limited legal grounds).