Retrospective application fees and the enforcement surcharge

A retrospective planning application fee is the same as the fee for the equivalent application made in advance, with one important exception. Where the application is made after the council has issued an enforcement notice covering the same development, the fee regulations provide for an increased fee, set at twice the amount otherwise payable. So the cost of waiting until the council acts is, in fee terms alone, double.

For a landlord who has converted a loft, added a rear extension or created an extra unit without permission, that is the arithmetic that decides the timing.

When a retrospective application is appropriate

The Town and Country Planning Act 1990 allows permission to be granted for development already carried out. There is no obligation to apply, and unauthorised development is not in itself a criminal offence in most cases, though breaching an enforcement notice is.

Applying makes sense in four situations. Where the works are clearly acceptable in planning terms and the only problem is the absence of consent. Where a sale or a remortgage is blocked by the lack of permission. Where the council has written asking for an application. And where an enforcement investigation is open and a refusal would be less damaging than a notice.

It makes less sense where the development is likely to be refused and no notice has been served, because an application creates a decision and a refusal gives the council a straightforward enforcement case.

That is a judgement about risk rather than about rules, and it is worth taking advice on the specific facts.

How the fee compares with an ordinary application

There is no premium and no discount for a retrospective application made before any enforcement notice. A retrospective householder extension is charged at the householder rate, a retrospective change of use at the relevant rate for that category.

Two consequences follow. First, budget the fee from the published national schedule for the application type you are actually making, and check the current figures, because fees were increased in December 2023 and are subject to annual indexation from April. Second, the resubmission fee exemption does not rescue you here. The exemption requires an earlier application on which a fee was paid, and a first retrospective application has no predecessor.

What a retrospective application does not attract is any additional charge for lateness. The council cannot invent one.

The increased fee where a notice has been served

Once an enforcement notice has been issued in respect of the development, the fee regulations increase the fee for an application for the same matters to twice the amount that would otherwise apply.

The trigger is the issue of the notice, not the opening of an investigation. A council officer writing to ask about works is not an enforcement notice, and an application made at that stage attracts the ordinary fee. That distinction is worth several hundred pounds on a small scheme and rather more on a conversion.

So if a council has contacted you about unauthorised works and you intend to apply, apply promptly. The window between the first letter and the issue of a notice is usually months rather than weeks, and it is the least costly time to act.

Check the current version of the fee regulations before relying on the doubling rule, since the fee provisions have been amended several times in recent years.

Fees on a deemed application at appeal

If a notice is served and you appeal against it, one of the available grounds is that planning permission ought to be granted for what was done. Appealing on that ground brings with it a deemed application for planning permission, and a fee is payable for it.

Two practical points. The deemed application fee is also set at the increased rate, so the appeal route does not avoid the doubling. And there are restrictions on relying on that ground where an application for the same development was made and refused shortly before the notice was issued, so the sequencing of any earlier application matters.

If the appeal on that ground fails, the notice takes effect and compliance becomes compulsory within the stated period. The other grounds of appeal, including that the time limit for enforcement has expired, are separate and can be run alongside.

Costs beyond the fee

The fee is rarely the largest number.

A retrospective application needs drawings of what was actually built, which means a measured survey rather than the design drawings that were never followed. It needs the same supporting documents as any other application of that type, and the local validation list applies in full.

Then there is the levy. Where a development is liable for the community infrastructure levy and work began without the required notices, instalment rights are lost and surcharges apply, and a retrospective permission can crystallise a liability that was never planned for. Check the levy position before applying, not after.

Building regulations are a separate regime with a separate regularisation process and its own charge. Planning permission does not cure a building control breach, and a solicitor acting on a sale will ask for both.

For a sense of the underlying budget, what a householder planning application really costs sets out the components, and what the householder application fee actually covers explains what the fee itself buys.

Where a certificate is the better route

If the development has been in place long enough to be immune from enforcement, a certificate of lawfulness for existing use or development is usually the better application to make.

The certificate confirms that the development is lawful. It is decided on evidence of fact rather than on planning merits, so a council that dislikes the development cannot refuse a certificate on that basis. For a lender or a buyer it is a stronger document than a retrospective permission, because it is not subject to conditions.

The fee for a certificate of existing lawfulness is normally the same as the fee for a planning application for that development, so the saving is in risk rather than in money. The evidence burden sits with the applicant and is exacting: dated photographs, sworn statements, council tax or rates records, utility bills and tenancy agreements covering every year of the relevant period.

Note that the enforcement time limits in England were changed by the Levelling-up and Regeneration Act 2023 towards a single ten year period. Check which period applies to your breach and when the change took effect before assuming immunity.

Checking the position before you apply

Four checks, in order.

1. Has an enforcement notice been issued in respect of these works, as opposed to an enquiry letter. Ask the council's enforcement team in writing.
2. Is the development immune, and can you evidence every year of the relevant period.
3. What is the levy position, including any surcharges already accrued.
4. What would the council's validation list require for an application of this type.

Only then decide between a retrospective application, a certificate and doing nothing. The right answer differs between a rear extension that everyone can see and an internal subdivision that nobody has noticed.

See PlanScope pricing if you want to draft the supporting documents for a retrospective application or a certificate yourself: one free report, £50 per report, or Professional for unlimited reports.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.