Appeal against non-determination or wait for a decision

You can appeal against non-determination the day after the statutory period expires, and for most minor applications that is eight weeks from validation. Thirteen weeks for a major, 16 where the development needs an Environmental Impact Assessment, or the end of any longer period you agreed in writing. The right comes from section 78 of the Town and Country Planning Act 1990, and it does not depend on the council behaving badly.

The question is whether you should use it. Lodging the appeal takes the application away from the officer who was about to recommend approval, hands it to an inspector who has never seen the site, and starts a process measured in months. On a self-build plot where the only outstanding item is a drainage condition, that is usually the wrong trade.

When the right to appeal arises

The determination periods sit in the Development Management Procedure Order 2015. They run from the date the application was validated, not the date you posted it, and validation can slip by weeks if the authority queries a document.

An extension of time agreed in writing replaces the statutory period. That agreement is what most officers ask for at week seven, and signing it moves your appeal deadline rather than removing it.

What the appeal decides and on what material

Section 79 allows the inspector to deal with the application as if it had been made to them in the first instance. That is a full redetermination on the development plan and material considerations as they stand at the date of the decision, not a review of the council's delay.

So the appeal is decided on the documents. If a survey is missing, it stays missing. If the drainage strategy was going to be firmed up through a Grampian condition after a conversation with the lead local flood authority, that conversation now happens through formal statements, or it does not happen at all.

The authority submits a questionnaire and a statement of case explaining the decision it would have made. Sometimes that statement confirms officers were minded to approve. Useful, and it still does not bind the inspector.

The negotiation you give up

Most applications that stall are stalled on one or two points. A consultee has not responded. The heritage officer wants a different window detail. The highways officer is waiting for a visibility splay drawing. Those are solvable in an email thread.

An appeal converts the email thread into pleadings. And it removes the officer's ability to accept a revised plan, because there is no longer an application in front of the authority to amend. If the fix is a drawing change, you cannot make it on appeal; you would need a fresh application, or later a section 73 application to vary what the inspector granted.

That is the single most common regret. The scheme that would have been approved with a small change gets refused on appeal because the small change could not be made.

Costs, timescale and the risk of a worse answer

The appeal itself is free to lodge. Everything else costs. Someone has to write a statement of case, respond to the authority's statement and deal with third party representations, and on anything beyond a simple householder scheme that is consultant time you had not budgeted.

Timescales depend on the procedure and the Inspectorate's workload. Written representations is the fastest route and still measured in months rather than weeks. A hearing or inquiry is longer again. None of that is predictable enough to programme a build around, which matters if you have a mortgage offer or a contractor with a start date.

Then there is the outcome risk. An inspector can refuse permission the council was ready to grant, and can impose conditions the officer would not have suggested. A refusal at appeal also becomes a planning history entry that the next application has to argue against.

Where an extension of time is the better call

Sign the extension when the delay has a visible cause and a visible end. A named consultee response outstanding. A committee date fixed. A single technical point being worked through with a named officer. Put a date in the agreement rather than leaving it open, and record what has to happen by then.

Push back when the extension is the third one, when nobody will name the outstanding issue, or when the authority has stopped answering. At that point the delay is the problem rather than a symptom of one.

Ask for three things in writing before you agree: the outstanding matters, the officer's current recommendation, and the target determination date. An officer who will not give you the first two is telling you something.

Making the call at week eight

Run through it in this order.

1. Is the application complete on its own terms, with every survey and statement the validation list required?
2. Would an inspector reading only the submitted documents grant permission?
3. Is there any change to the scheme you still want to make?
4. Has the authority identified a specific unresolved issue, and is it capable of being resolved by a condition?
5. What does a three to six month delay cost you against the cost of preparing appeal statements?

Appeal if the answers are yes, yes, no, no. Wait if any of them points the other way. Take an illustrative case: a two unit infill scheme, validated in March, where the highway authority has not commented by late May and the case officer says the layout is otherwise acceptable. Appealing there converts a solvable consultation gap into a hearing about highway safety with no highway evidence on either side.

Where the application was refused rather than left undecided, the route differs and which appeal route applies depends on the application type.

Preparing the file either way

Whichever route you choose, the work is the same: a document set that stands on its own. A Planning Statement that addresses each development plan policy the officer has cited, the supporting technical reports the validation list called for, and a short schedule of correspondence showing what was asked and when it was answered.

Build that file while you are waiting. If you end up appealing, the statement of case writes itself from it. If the council determines the application, you have a cleaner permission. Either way you are not assembling evidence under a deadline you did not choose.

You can see the document types a full case needs grouped by category, which is a faster check than working through a validation list line by line.

Enter your postcode on PlanScope to see which reports your site is likely to need before week eight arrives.

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.