What happens if a lawful development certificate is refused?

A refused lawful development certificate is not a fine, an enforcement notice or a ban. It is the council saying that, on the information it was given, it is not satisfied that what you proposed would be lawful. Under section 192 of the 1990 Act, the council must issue a certificate if the information satisfies it, and refuse “in any other case” — so a refusal is often about what was shown, rather than what is true.

That matters, because it means many refusals can be put right.

What a refusal means in practice

• Nothing has been decided against your property. A refusal is not a finding that you need planning permission; it is a finding that lawfulness was not shown.
• If the annexe is not yet sited, do not site it until the position is resolved. Going ahead after a refusal invites exactly the attention a certificate is meant to avoid.
• Read the reasons. The decision notice has to give them, and they tell you which test the council was not satisfied on.

The most common reasons for refusal

Refusals for garden annexes almost always come down to one of the legal tests the case rests on:

1. Mobility not shown. The application asserted that the unit is a caravan, but did not evidence that the assembled unit could be moved as a whole. See the Caravan Act and garden annexes.
2. Not within the curtilage. The position is on land the council considers to be outside the garden of the house. See residential curtilage.
3. A separate dwelling. The description of who will live there, and how, read as a second household rather than part of the first. See ancillary occupation.
4. Too big, or more than two sections. The unit falls outside the statutory definition.
5. The works are development. Bases, walls or access works described in the application amount to operational development needing permission in their own right.
6. Not enough information. Plans without a scale or site boundary, missing technical evidence, or a vague description — the council cannot certify what it cannot see.

Your options after a refusal

1. Apply again, with the gap closed

Where the problem was evidence — mobility, plans, a clearer account of the household — a fresh application that addresses the stated reasons is often the quickest route.

2. Change the proposal

A different position in the garden, a different model, or removing works that tipped the case into development can change the answer.

3. Appeal

Only the applicant can appeal, against a refusal or if the council has not decided within eight weeks. There is no fee, and normally no deadline — though the deadline is six months for a listed building certificate, and you should not appeal if you have already been served an enforcement notice (GOV.UK). An appeal decides whether the council was right on the information before it, so it suits cases where the evidence was sound and the council took a different legal view.

4. Apply for planning permission

If the honest answer is that the proposal is development — a separate home, a permanent building — then a certificate is the wrong application, and planning permission is the route.

Avoiding a refusal in the first place

Almost every reason above is visible before an application is made. That is why we assess every case against these tests first, and tell you if we do not think it will succeed — see how a case is assessed and built.

Sources

• Town and Country Planning Act 1990, section 192
• GOV.UK: appeal a lawful development certificate decision
• Development Management Procedure Order 2015, article 39 (eight-week decision period)

Checked October 2026. This guide explains general principles for England; it is not advice on any particular property.