Have you renovated your property without planning permission? Or carried out works beyond your permitted development limits? You may need to make a retrospective planning application. This guide explains the full process and the key changes under the Levelling-up and Regeneration Act 2023.
Already Received a Planning Enforcement Notice?
If you have received a planning enforcement notice (EN), do not ignore it. It is served under Section 172 TCPA 1990. Non-compliance is a criminal offence. You could face an unlimited fine. Local authorities can also carry out works to remedy the breach and charge you for it.
Once served, you have two options:
- Submit a retrospective planning application to fix the development. This does not suspend the notice, but local authorities may agree to hold action while it is decided.
- Appeal against an enforcement notice to the Planning Inspectorate under Section 174 TCPA 1990. This suspends the notice until the appeal is resolved.
The deadline to appeal is 28 days from the date of service. Miss it and the notice becomes final. There is no power to extend it.
When Do You Need Retrospective Planning Permission?
Breach of Planning Control: What Triggers the Need to Apply
You need retrospective planning permission when development requires planning permission but was carried out without it. A breach of planning control is defined under Section 55 TCPA 1990. It covers building operations, material changes of use, and splitting of a dwelling. Common change of use cases include HMO planning permission.
Common situations needing retrospective planning permission include:
- Extensions built beyond permitted development limits
- Loft conversions where permission was required
- Flat conversions carried out without the necessary planning permission
- Works to a listed building without consent
- Structural alterations undertaken without permission beforehand
Planning Control and Permitted Development: A Critical Distinction
By virtue of permitted development rights, you cannot make an unlawful structure lawful. Under Section 191 TCPA 1990, a lawful development certificate only confirms that development was lawful when carried out. It does not matter that current PD limits might now allow the works. The test is what the law said at the time. Planning Jungle appeal decisions confirm this. It is widely misunderstood.
How to Respond to a Planning Enforcement Notice
Step 1 — Read the notice. It must name the alleged breach of planning control, the steps to remedy it, and the time to comply. Any flaw may form a ground of appeal.
Step 2 — Note the 28-day deadline. This runs from the date of service — not the date you read it.
Step 3 — Take advice right away. Speak to an expert planning consultant or planning expert. The grounds of appeal are legal and specific. Missing the deadline cannot be undone.
Step 4 — Decide your strategy. You can appeal against an enforcement notice, submit a retrospective planning application, comply, or combine approaches. The order in which you act matters.
Engaging Planning Authorities Before Formal Action
Step 5 — Consider engaging planning authorities. A local planning authority may agree not to pursue enforcement while a retrospective planning application is decided. This is worth exploring early.
What Is Retrospective Planning Permission?
Retrospective Planning Application: The Legal Basis
Retrospective planning permission fixes development carried out without prior planning consent. The legal basis is Section 73A TCPA 1990. You can apply for planning permission retrospectively, after works are complete. It is a legal right, not a loophole.
Planning officers assess a retrospective planning application on the same merits as any other. They apply the same policies and local planning regulations. Permission is often possible where the works would have been approved with proper advice.
How to Apply for Retrospective Planning Permission: The Standard Application Process
To make a retrospective planning application, use the same standard application process via the Planning Portal. Our architectural services cover everything from as-built drawings to planning statements. There is no separate form for retrospective cases. You will need:
- As-built drawings
- A planning statement
- Supporting reports where needed (heritage, structural, drainage)
- Payment of the standard planning application fee
Pre-application advice from the relevant planning authorities is strongly recommended. It lowers the risk of a planning refusal and helps meet planning requirements before you submit.
Stricter Rules Under the Levelling-up and Regeneration Act 2023
The LURA came into force on 25 April 2024. It introduced three changes that affect retrospective planning directly.
Abolition of the four-year rule. A single ten-year time limit now applies. This is now the unauthorised work time limit for enforcement on all alleged breaches of planning control completed on or after 25 April 2024. Breaches before that date keep the old four-year rule under the old transitional rules.
Enforcement Warning Notices. Under new Section 172ZA TCPA, planning authorities can issue an enforcement warning notice (EWN). This invites a retrospective planning application within a set period. An EWN is enforcement action. It stops the protection clock right away.
Ground (a) restriction. Under new Sections 174(2A)–(2B) TCPA, if an application has been made and refused and the refusal dismissed on Section 78 appeal, you cannot appeal a later enforcement notice on Ground (a). This applies where the notice is issued within two years of that appeal decision. There is no third bite at the cherry.
Retrospective Planning Permission Cost
In England, the fee is the same as a standard planning application fee. There is no national surcharge. From 1 April 2025 the fees are:
- Householder applications: £528
- New dwellings: £578 per unit
- Planning Portal online charge: £70 inc. VAT
Fees rise annually with CPI. Scotland applies a 25% surcharge under local planning regulations.
Additional Costs for Retrospective Planning Approval
Listed Building and Conservation Area Requirements
Beyond the fee, typical costs include:
- As-built drawings: £800–£3,000+
- Planning statement: £500–£2,500
- Heritage statement for a listed building or conservation area: £750–£3,500
- Pre-application advice fees
- If permission is refused: professional representation on appeal, often £10,000–£30,000+
Securing planning permission before starting work is always cheaper.
Appealing Against a Planning Enforcement Notice
An appeal against an enforcement notice is set by Section 174 TCPA 1990. It proceeds by written representations, hearing, or inquiry. The Planning Inspectorate targets 24–26 weeks for most cases. The appeal suspends the notice while it is determined.
Grounds for Appealing a Planning Enforcement Notice
Alleged Breaches of Planning Control: The Seven Statutory Grounds
You must base your appeal on one or more grounds. These are set out in Section 174 of the Town and Country Planning Act 1990:
- Ground (a): That planning permission should be granted for the development as built
- Ground (b): That the alleged breach of planning control has not occurred
- Ground (c): That the alleged breaches of planning control do not count as a breach — for example, planning permission is not required because the works fall within permitted development rights
- Ground (d): That the time limits for taking enforcement action have expired — ten years for all post-April 2024 alleged breaches of planning control
- Ground (e): That the enforcement notice was not properly served
- Ground (f): That the steps required to remedy the breach are excessive
- Ground (g): That the time to comply is too short
Ground (a) is the most common. But watch out for the LURA restriction. If this happens, Ground (a) is barred. There is no further route through the enforcement appeal.
Ground (c) is strong where works genuinely fall within PD rights. Use our permitted development checker to confirm your position before relying on this ground. Planning Jungle’s appeal database is very useful here. Many Ground (c) appeals turn on the exact wording of the GPDO. Always check whether an Article 4 direction removes the relevant PD rights first.
Ground (d) needs solid documents as evidence. This includes dated photographs, invoices, building contracts, utility records, or written declarations. The Welwyn Hatfield Borough Council v Secretary of State [2011] UKSC 15 principle applies. Deliberately concealing development means you lose the right to rely on any protection window.
Plead all strong grounds at the same time. Grounds not raised now generally cannot be used later.
What Happens After You Submit Your Appeal
Applying Retrospectively: The Inspector’s Powers
Once PINS receive the appeal, the enforcement notice is suspended. The LPA submits their statement of case. The appellant responds with their grounds. A site visit takes place. The Inspector then issues a written decision.
The Inspector can:
- Dismiss the appeal
- Quash the notice
- Grant retrospective permission on Ground (a)
- Vary the terms of the notice
If dismissed, you can apply for a legal review under Section 289 TCPA 1990. This is only available on a point of law and must be made within 28 days.
The 4 and 10-Year Rules: When Unauthorised Development Becomes Lawful
Before 25 April 2024, the time limit for enforcement was four years for building operations. It was ten years for changes of use and any breach of a planning condition. LURA abolished the four-year rule. A single ten-year period now applies to all new alleged breaches of planning control.
Why Hiding Your Development Derails the Enforcement Clock
Welwyn Hatfield confirms that hiding development from planning authorities removes any protection. Courts use social media, EPC records, estate agent listings, and building control records to pin down dates. The enforcement clock only runs for open, visible development.
If You Can, Don’t Rely on Retrospective Planning Permission
When Permission Is Refused: The Consequences
Retrospective planning is a last resort. When permission is refused it can directly trigger enforcement action. A live breach of planning control will come up in your solicitors’ searches. It can abort a sale or refinancing. Getting permission before starting work costs far less than dealing with enforcement and appeals.
Why Don’t People Apply for Planning Permission First?
“I Didn’t Realise Planning Laws Applied”
Breach of Planning: When Ignorance Is Not a Defence
This is the most common reason. Local planning regulations create genuine traps. Article 4 directions, conservation area rules, listed building requirements, prior approval conditions — they interact in complex ways. A common example is planning permission for outbuildings, which many owners wrongly assume is never needed. Not knowing the rules is not a legal defence for a breach of planning control. But if permission would likely have been granted, an expert planning consultant can often get retrospective permission. Enforcement does not have to escalate.
“It Takes Too Long”
Householder applications must be decided within eight weeks. Prior approval takes 42 days. The feeling that planning is slow usually comes from incomplete submissions. A planning expert who manages the process properly removes this problem.
“I Hoped No One Would Notice”
This is the highest-risk approach. Planning authorities have stronger enforcement powers under LURA. The four-year rule has gone. Concealment removes protection. Neighbours report planning breaches online. Aerial imagery is used to work out when development appeared.
What Is the Time Limit for Retrospective Planning Permission?
There is no time limit on when you can apply for retrospective planning permission. But whether planning authorities can still take enforcement action is a separate question. That is set by the time limit for enforcement under Section 171B TCPA 1990.
The 4-Year Rule for Building Works
For breaches largely completed before 25 April 2024, the four-year time limit still applies under the old transitional rules. Once four years have passed, planning authorities can no longer issue an enforcement notice for those works. For more on permission timescales, see how long does planning permission last. You should still apply for a certificate to confirm the position formally.
The 10-Year Rule for Change of Use or Ongoing Breaches
Changes of use and post-April 2024 building breaches need ten years before protection applies. So does any continuing breach of a planning condition. A local planning authority may serve an enforcement notice on an ongoing breach at any time. This is true even if the original breach is over ten years old.
Lawful Development Certificates as Proof
Once a protection window has run, apply for a Lawful Development Certificate under Section 191 TCPA 1990. This formally confirms lawfulness. It is not automatic. You must apply, provide evidence, and get a decision from the LPA.
An LDC confirms that original planning requirements have been met or that the protection window has run. It is essential for sales, mortgages, and refinancing. By virtue of PD rights, you may also apply for a certificate. This confirms no planning permission was ever required. It only works where those rights applied to the works as originally carried out.
Property Transactions and Financing Issues
Selling a Property with Unauthorised Development
Selling a property without planning permission for works that needed it will show up in CON29 searches. It must also be disclosed in the Seller’s Property Information Form. Buyers will require an LDC, retrospective permission, or insurance cover.
Insurers will not cover planning breaches already known to planning authorities. Never contact the LPA about an undisclosed breach before taking legal advice. Doing so will void any insurance cover.
Refinancing or Remortgaging Considerations
Lenders check planning history against the physical property. Where permission is refused or a breach is not resolved, lenders may decline. They may also require the property to comply with planning requirements before they lend. CLEUD applications under Section 191 are the standard route for older breaches within the enforcement time limit.
AC Design Solution is a CIAT-accredited Chartered Architectural Technology practice based in Uxbridge. We handle retrospective planning applications, enforcement appeals, and LDC applications across London and the UK. Nothing in this article constitute legal advice — always take advice specific to your situation.
Frequently Asked Questions
What if My Retrospective Application Is Refused?
When permission is refused under Section 73A, you can appeal under Section 78 TCPA. The deadline is six months for most cases and 12 weeks for householder applications. The first new submission within 12 months is free. Under LURA, a dismissed Section 78 appeal blocks a later Ground (a) enforcement appeal. This applies where a notice follows within two years.
Can I Apply After 10 Years Have Passed?
Yes — there is no time limit on a retrospective planning application. After ten years, apply for a certificate of lawful development under Section 191 instead. Only apply for planning permission if you also need to extend or change the development further.
Does Immunity Mean My Development Is Automatically Lawful?
No. You must apply for a certificate — an LDC under Section 191 — to make the position formal. Permission is often assumed to follow from the passage of time. It does not. You need a properly supported application and a formal LPA decision.
How Long Do I Have to Appeal an Enforcement Notice?
28 days from the date of service. This is a hard deadline under Section 174(3) TCPA 1990. There is no extension. Miss it and the notice becomes final. Contact an expert planning consultant the same day you receive the notice.
