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Unauthorised development does not always lead immediately to formal enforcement. A homeowner may discover that an extension required planning permission, a landlord may face questions about a change of use, or a developer may be told that completed work does not match the approved plans. In some cases, a retrospective planning application can provide a practical route to regularising the position.
That route needs careful thought. Permission is not guaranteed, making an application does not automatically stop enforcement, and the decision to apply can affect later appeal options. Anyone considering a retrospective planning permission solicitor or another planning-law professional should first understand the planning history and the stage the council has reached. Aldwych Legal supports clients across England with planning disputes, enforcement responses and strategic case preparation.
What Is a Retrospective Planning Application?
Section 73A of the Town and Country Planning Act 1990 allows an application to be made for planning permission for development that has already been carried out without the required permission. This can include completed building works or a material change of use that began before permission was obtained. The application is assessed through the normal planning process against the development plan and other material planning considerations.
The fact that the development already exists does not give it preferential treatment. The council must consider the application properly and cannot assume that permission should be granted simply because removing or reversing the development would be inconvenient.
When Can Retrospective Permission Be Helpful?
A retrospective application may be sensible where the main problem is the absence of planning permission rather than a fundamental objection to the development. For example, a council may consider that unauthorised works could be acceptable subject to conditions, or that a change of use could remain if noise, parking, opening hours or another planning impact is controlled.
Government guidance says local planning authorities should usually avoid formal enforcement where development is acceptable on its planning merits and enforcement would serve only to regularise the development.
An authority can therefore invite the owner to submit a retrospective application where it considers that route appropriate.
Aldwych Legal can support evidence-led planning-dispute preparation where the owner needs to compare the existing development with planning permissions, policies and council concerns before deciding whether an application is worthwhile.
An Invitation Does Not Mean Permission Will Be Granted
A council officer suggesting a retrospective application should not be interpreted as promising approval.
The authority must preserve its discretion and determine the application in the normal way. Consultation responses, planning policy and the actual effects of the development may still result in refusal.
Before applying, the owner should consider:
- the relevant planning policies;
- the council’s stated concerns;
- whether technical evidence is needed;
- whether amendments could improve the proposal; and
- whether another planning route may be stronger.
Obtaining retrospective planning application advice before filing can be particularly useful where the development is already the subject of an enforcement investigation.
Enforcement Warning Notices Are Now Part of the Process
Since 25 April 2024, local planning authorities in England have been able to issue an enforcement warning notice under section 172ZA of the 1990 Act. An enforcement warning notice may be used where unauthorised development appears to have a reasonable prospect of being acceptable in planning terms. It identifies the apparent breach and states that a retrospective application should be submitted by a specified date, warning that further enforcement action may follow if that does not happen.
There is no appeal to the Secretary of State against an enforcement warning notice. Its issue also counts as taking enforcement action for certain statutory time-limit purposes. The document should therefore be treated as more than an informal invitation.
A Retrospective Application Does Not Automatically Stop Enforcement
This is one of the most important risks. Submitting an application under section 73A does not automatically suspend or prevent enforcement action. The local planning authority may continue considering enforcement, and an enforcement notice may still be issued in relation to the development or other elements of it.
For owners facing council action, unauthorised development legal advice may therefore involve comparing several possible routes rather than treating a retrospective application as an automatic solution.
Further information on evidence-led planning disputes and enforcement can be reviewed at https://aldwychlegal.com/planning-permission-disputes/.
Think About Ground (a) Before Making the Application
The relationship between retrospective applications and enforcement appeals changed significantly in 2024. Ground (a) of an enforcement-notice appeal asks for planning permission for the matters alleged in the notice. In effect, it allows the planning merits to be considered through a deemed planning application.
However, a person who has already made a related retrospective planning application does not always retain an unrestricted opportunity to argue the same planning merits again under ground (a).
For enforcement notices issued on or after 25 April 2024, ground (a) is restricted where the notice was issued after the making of a related retrospective application and within two years of the date on which that application ceased to be under consideration.
The choice of route can therefore have strategic consequences. Aldwych Legal can support case preparation where the sequence of applications, council decisions and enforcement action needs to be mapped carefully.
What if an Enforcement Notice Has Already Been Issued?
Section 70C can allow a local planning authority to decline to determine a retrospective planning application where an enforcement notice has previously been issued and the statutory requirements are satisfied.
Once an enforcement notice exists, the recipient should first review the alleged breach, the effective date and the available grounds of appeal rather than assuming that another planning application can simply replace the enforcement process.
If an enforcement appeal is needed, the effective date is critical. The Planning Inspectorate must receive the appeal before the enforcement notice takes effect. Discussions with the council or preparation of a retrospective application do not extend that deadline.
Could a Lawful Development Certificate Be Better?
Sometimes the real issue is not whether permission should be granted, but whether the existing use or development is already lawful.
A Lawful Development Certificate may be appropriate where the owner can demonstrate lawfulness under the statutory test. This might involve an existing planning permission, permitted development rights or the relevant enforcement time-limit rules.
The evidence may include historic photographs, invoices, tenancy documents, business records, mapping or witness statements.
An LDC and retrospective planning permission answer different questions. The certificate concerns lawfulness; a retrospective planning application concerns whether permission should now be granted on planning merits.
Consider Possible CIL Consequences
Retrospective permission can also affect Community Infrastructure Levy liability.
Current government guidance states that, in CIL charging areas, retrospective permission is generally not eligible for relief or exemption other than the minor development exemption. A development that might otherwise have qualified for a relief can therefore face a different financial position if permission is sought after the event.
For potentially chargeable development, the CIL consequences should be considered before choosing the retrospective route.
Keep Planning Permission Separate From Other Approvals
Retrospective planning permission only addresses planning control. It does not automatically provide Building Regulations approval, resolve licensing requirements, remove restrictive covenants or determine title rights.
A development can therefore be regularised for planning purposes while another regulatory or private-law problem remains. Planning permission legal advice should be considered alongside any separate building-control, licensing or property issues affecting the site.
Conclusion
A retrospective planning application can be useful where development has taken place without the required permission and has a realistic prospect of being acceptable on its planning merits. It can provide a structured way to regularise the position before or during an enforcement investigation.
But the route can also increase risk. Permission may be refused, enforcement does not automatically stop, section 70C can affect applications after an enforcement notice, and a prior retrospective application can restrict a later ground (a) appeal.
Aldwych Legal supports clients across England with planning-dispute preparation, enforcement responses and strategic case management. Before making a retrospective application, the safest approach
