Planning Permission: Challenges, Refusals & Retrospective Applications

Setfords Law Published: 12 August 2026, Last reviewed: 12 August 2026, Read time: 10 minutes

A planning refusal isn’t necessarily the end of the road, and building something without permission first isn’t automatically a lost cause either. Both situations have a proper legal route, with strict time limits attached. This guide covers how to challenge a planning refusal, how retrospective planning applications work, and what enforcement action can mean if you’ve already built without permission.

Key takeaways

• You can appeal a planning refusal to the Planning Inspectorate, but strict time limits apply.
• Retrospective planning permission lets you apply after building something, but it doesn’t guarantee approval or protect you from enforcement in the meantime.
• Local authorities can take enforcement action against unauthorised development, including requiring it to be removed or reversed.
• Unauthorised development can become immune from enforcement after a set number of years, but relying on this is risky.
• Judicial review is a separate, narrower route used to challenge how a decision was made, not simply to disagree with the outcome.

Planning decisions can feel final, but there’s usually more than one option available, whether you’re contesting a refusal, trying to regularise something you’ve already built, or responding to enforcement action. Acting quickly matters in all three situations.

How to challenge a planning refusal

If your planning application has been refused, you generally have a right to appeal to the Planning Inspectorate, which acts on behalf of the Secretary of State. This is separate from asking the local council to reconsider.

• Written representations. The most common route for smaller or more straightforward applications, decided on the basis of written evidence alone.
• Hearing. A more discussion-based session, used where a degree of debate would help the inspector reach a decision.
• Public inquiry. The most formal route, generally reserved for larger, more contentious, or more complex proposals.

The Planning Inspectorate decides which procedure applies based on the nature and scale of the application, though you can indicate a preference when appealing.

What if I just disagree with how the council reached its decision? An appeal looks at the planning merits of your proposal afresh. If instead you believe the council acted unlawfully, for example by following the wrong process or ignoring a relevant policy, that’s a different route entirely (judicial review, covered further down this guide).

Key figures

6 months to appeal most planning refusals · 12 weeks to appeal a householder development refusal · 4 years enforcement time limit for building works and change of use to a single dwelling · 10 years enforcement time limit for most other breaches · Town and Country Planning Act 1990 (the core framework)

The Town and Country Planning Act 1990 sets out the planning system in England and Wales, including the right to appeal a refusal, the process for retrospective applications, and the local authority’s enforcement powers. The time limit for lodging an appeal is generally 6 months from the date of the decision, though this is shortened to 12 weeks for most householder development appeals. Separate time limits apply to enforcement action, depending on the type of breach.

(These are the general statutory time limits, not guaranteed outcomes for any individual case, and appeal deadlines in particular should always be checked against your specific decision notice. Confirm how they apply to your situation with your solicitor.)

How retrospective planning applications work

If you’ve already built or changed something without planning permission, you can apply for retrospective permission, sometimes described as an application under section 73A of the Town and Country Planning Act 1990. This asks the local authority to approve what’s already been done, as if you were applying beforehand.

A retrospective application is assessed on exactly the same planning merits as any other application. The fact that the work has already been carried out doesn’t make approval more likely, and in some cases can work against you, particularly if the development has caused harm that would have been avoided by seeking permission first.

Submitting a retrospective application also doesn’t automatically pause any enforcement action the council has already started, or prevent it from starting new action while your application is considered.

Enforcement action and the immunity rules

If a local authority believes there’s been a breach of planning control, it can take enforcement action, which can include an enforcement notice requiring the development to be removed, altered, or stopped. Ignoring an enforcement notice is a criminal offence, not simply a civil matter.

What is the four-year and ten-year rule? Unauthorised development can become immune from enforcement action if enough time passes without the council acting. Broadly, building works and the change of use of a building to a single dwelling become immune after 4 years, while most other breaches of planning control become immune after 10 years. Once immune, the development is generally treated as lawful, even without formal permission.

Relying on these time limits rather than seeking permission properly is a risky strategy. The clock only runs from when the breach began, proving exactly when that was can be difficult, and the council can still act at any point before the relevant period has actually passed.

Challenging an enforcement notice. If you receive an enforcement notice, you can appeal it to the Planning Inspectorate on various grounds, including that planning permission should be granted, that the time given to comply is too short, or that the notice itself is defective. This appeal must generally be made before the notice takes effect.

When judicial review applies

Judicial review is a claim in the High Court challenging the lawfulness of how a decision was made, rather than whether the decision itself was the right one on the planning merits. It’s used where a council may have acted outside its powers, failed to follow the correct process, or ignored something it was legally required to consider.

Judicial review has a short time limit, generally requiring a claim to be brought promptly and, for planning matters, ordinarily within 6 weeks of the decision being challenged. This is considerably tighter than the appeal deadline, so it needs to be considered quickly.

It’s a narrower and more legally technical route than an ordinary planning appeal, and it doesn’t ask the court to decide whether your development should have been approved, only whether the process behind the decision was lawful.

What slows things down

Missing the appeal deadline. Once the time limit has passed, you generally lose the right to appeal that specific decision and may need to submit a fresh application instead.

Submitting a retrospective application without addressing the original concerns. If the same issues that would have caused a refusal are still present, a retrospective application faces the same obstacles.

Confusing an appeal with judicial review. The two have different tests, different time limits, and go to different bodies, so picking the wrong route can waste the time you have to act.

What helps

Check your decision notice for the exact appeal deadline. The date runs from the decision, not from when you found out about it, so don’t assume you have longer than you do.

Get advice before submitting a retrospective application. Understanding whether the original planning objections can genuinely be overcome saves time compared to submitting and hoping.

Respond to enforcement notices promptly, even if you plan to appeal. Missing the window to appeal an enforcement notice can leave you with a notice that’s already taken effect.

What happens next depends on your specific decision notice, how much time has passed, and whether any enforcement action has already started. Speak to our team for a confidential, no-obligation conversation about your options.

Common mistakes

1. Assuming there’s more time to appeal than there is. The 12-week deadline for householder appeals catches people out, since it’s much shorter than the general 6-month limit.

1. Building first and assuming a retrospective application is a formality. It’s assessed on the same planning merits as any other application, with no presumption in favour of what’s already built.

1. Relying on the four or ten-year immunity rule as a strategy. Proving exactly when unauthorised development began can be difficult, and the council can act at any point before the period has passed.

1. Ignoring an enforcement notice. Failing to comply is a criminal offence, separate from any right to appeal the notice itself.

When to speak to a solicitor

Planning matters move quickly once a deadline is in play, so early advice tends to preserve more options. Speak to a solicitor if:

• You’ve had a planning application refused and want to know whether to appeal.
• You’ve built something without permission and want to regularise it.
• You’ve received an enforcement notice.
• You believe a council acted unlawfully in reaching its decision.
• You’re unsure whether your appeal deadline has already passed.

What to bring to your first conversation

Having the right information ready makes your first conversation with a solicitor far more useful. Gather together:

• Your original planning application and decision notice.
• Any enforcement notice or correspondence from the council.
• Photographs or evidence showing when any unauthorised work was carried out.
• Details of the specific reasons given for any refusal.

FAQs

Can I appeal a planning refusal more than once?

No, you only get one appeal against a specific decision. If it’s dismissed, your options are generally a fresh application addressing the inspector’s concerns, or in rare circumstances, a legal challenge to the appeal decision itself.

Will submitting a retrospective application stop enforcement action?

Not automatically. A council can continue or start enforcement action while a retrospective application is being considered, although many councils will wait for the application to be decided first.

What happens if I sell a property with unauthorised development on it?

The risk of enforcement action generally passes to the new owner, since it attaches to the land rather than the person who carried out the work. This is often picked up during conveyancing searches and can affect a sale.

Is there a fee to appeal a planning decision?

Appeals to the Planning Inspectorate are generally free to submit, though you may still incur your own costs for professional advice or evidence. This differs from judicial review, which involves court fees and a greater risk of costs if the claim is unsuccessful.

About the author:

This article is general information about planning permission in England and Wales and is not legal advice. The law can change and every situation is different, so please speak to a qualified solicitor about your circumstances.