Planning Rules
Retrospective Planning Permission: Applying After the Work is Done (2025)
If you’ve carried out development without planning permission, it may still be possible to regularise it by applying for retrospective permission. Here’s how it works and when it’s available.
⏱ 6 min read📅 Updated June 2025🏠 England only
Quick Answer
Retrospective applications are allowed — but refusal means enforcement
Retrospective planning permission (formally a “planning application for development already carried out”) is a legitimate route to regularise development that was carried out without the required permission. The council assesses the application on its merits in the normal way — the fact that the work has already been done doesn’t change the planning assessment. If permission is granted, the development is lawful. If refused, the council will typically follow up with enforcement action requiring the works to be undone.
How to Apply
A retrospective planning application is submitted in exactly the same way as a pre-construction application — through the Planning Portal or the council’s own system. The forms and documents required are the same. The only difference is that the application is for works already carried out rather than proposed works.
The fee is the same as for a pre-construction application. The council has 8 weeks to determine a householder application. The council can grant or refuse permission — it cannot refuse to consider the application simply because the works are already done.
⚠️ Don’t rely on time passing to make development lawful Development without planning permission doesn’t automatically become lawful just because time passes — the time limits for enforcement action (4 years for operational development, 10 years for change of use) start the clock running. But until those limits expire, the council can still take enforcement action. A retrospective application is the cleanest way to regularise the position.
How It’s Assessed
The council assesses a retrospective application on exactly the same planning policy grounds as a pre-construction application. The fact that the work is already done doesn’t give it a planning advantage. The test is: if this application had been submitted before the work was done, would it have been approved?
In practice, councils sometimes weigh the harm of requiring demolition against the planning harm of the development. Where the works are minor and would likely have been approved, retrospective permission is usually granted. Where the development is clearly contrary to policy (e.g. in Green Belt), retrospective permission is typically refused.
What Happens if the Application is Refused
If retrospective permission is refused, you can appeal to the Planning Inspectorate in the normal way (within 12 weeks for householder applications). If the appeal is also dismissed, the council will typically serve an enforcement notice requiring the development to be removed or the use to cease. You should take professional advice before deciding whether to appeal or comply.
✅ Councils cannot fast-track enforcement while an application is pending While a retrospective application (or a subsequent appeal) is being determined, the council cannot normally serve an enforcement notice requiring compliance. The application/appeal process gives you time to regularise the position through the proper planning system.
There are two ways to regularise development that has been carried out:
- Retrospective planning application: Applies for permission for works that needed permission and didn’t have it. The council assesses on planning merits
- Lawful Development Certificate (LDC): Confirms that development is lawful — either because it was permitted development, or because it has become lawful through the passage of time (the enforcement time limits have expired). An LDC is not a planning application — it’s a certificate of fact
If the development was permitted development (and didn’t need planning permission), the right route is an LDC, not a retrospective application. If the development needed permission and didn’t have it, and the enforcement time limits haven’t expired, a retrospective application is the right route.
Frequently Asked Questions
Can I apply for planning permission after the work is done?
Yes — retrospective planning applications are a legitimate and recognised route to regularise development carried out without permission. The application is assessed on its planning merits in the same way as a pre-construction application. If approved, the development is lawful. If refused, you can appeal, and if the appeal is dismissed, the council will typically pursue enforcement action.
What happens if I built without planning permission?
If you built something that needed planning permission without obtaining it, you have a few options: apply for retrospective planning permission; wait to see if the council takes enforcement action (they have 4 years for buildings, 10 years for change of use); or apply for a Lawful Development Certificate if the enforcement time limit has expired. Doing nothing is risky — the council can still take action within the time limits, and the breach will show up in property searches when you sell.
How long before development without planning permission becomes legal?
Operational development (buildings, extensions) becomes immune from enforcement after 4 years. Change of use becomes immune from enforcement after 10 years. Once the time limit has passed, you can apply for a Lawful Development Certificate (LDC) confirming the development is lawful. Note: time limits start from when the development was substantially completed, not when it was started. Concealment of the breach can affect time limits.
Does retrospective planning permission cost more?
No — the fee for a retrospective planning application is the same as for a pre-construction application. There is no premium or penalty for applying retrospectively. The council also cannot refuse to consider the application because the works are already done — they must assess it on its planning merits.
More on Permitted Development Rights
Extensions, loft conversions, outbuildings, solar panels — our complete guide covers everything you can build without planning permission.
Read the Complete PD Guide →
