Determination periods, extensions and the planning guarantee

The determination period for a planning application is eight weeks for most applications, 13 weeks for major development, and 16 weeks where an environmental statement has been submitted. Those periods come from Article 34 of the Town and Country Planning (Development Management Procedure) (England) Order 2015 and they run from the date the application became valid, not the date you submitted it. A council can ask you to agree a longer period in writing, and whether you should say yes depends on what you give up by doing so.

For a self-builder with a contractor booked and a mortgage offer with an expiry date, that decision is worth five minutes of thought rather than a reflexive yes.

The statutory periods and what they apply to

The three periods cover different categories. Eight weeks is the default for householder and other minor applications. Thirteen weeks applies to major development, broadly ten or more dwellings, 1,000 m² or more of floorspace, or a site of 0.5 hectares or more. Sixteen weeks applies where development is accompanied by an environmental statement.

Other application types run on their own clocks. Prior approval under the permitted development regimes has shorter and differently structured periods, and the consequences of a council missing them are not the same, which prior approval applications and how the clock works sets out.

The start date is the one people get wrong. Validation is what starts the clock, and an application stuck in a validation dispute for three weeks has used none of its eight.

Agreeing an extension of time in writing

Article 34 allows a longer period where it is agreed in writing between the applicant and the authority. In practice this is a short email exchange, often initiated by the case officer in week six or seven with a proposed new date.

There are decent reasons to agree. A consultee response is outstanding and the officer needs time to assess it. An amendment you asked to make needs re-consultation. The officer is recommending approval and wants to take the case to the next committee cycle rather than refuse it for want of time.

There are poor reasons too. An extension requested because no officer has yet looked at the file, with no proposed date, and no indication of what will happen in the extended period, is a request to carry the authority's workload.

Agree a date rather than an open-ended extension, and ask what will be done by then. An extension to a stated date with a stated purpose is a reasonable commercial accommodation. One without either is not.

What an extension does to appeal rights

This is the part that is easy to miss. The right to appeal against non-determination under section 78 of the Town and Country Planning Act 1990 arises once the determination period, including any agreed extension, has expired. Agreeing an extension therefore pushes back the earliest date you can appeal.

That is usually fine, because a non-determination appeal is rarely a good idea. It hands the decision to an inspector without the authority having set out its position, you lose the chance to amend in response to an officer's concerns, and the appeal takes longer than waiting would have done in most cases.

Where it is the right move is when the authority has gone quiet on an application it is minded to refuse for reasons you are confident about, and delay is costing more than the appeal risk. Appeals against non-determination must be lodged within six months of the expiry of the relevant period, so the window is not indefinite.

The planning guarantee and the fee refund

The planning guarantee is the government commitment that no application should take more than 26 weeks to decide, given effect through the fees regulations: the fee is refunded where an application has not been determined within 26 weeks of the valid date.

Two conditions matter. The 26 weeks runs from validation, and the refund is displaced where an extension of time has been agreed. So agreeing an extension in week seven can cost you the refund that would otherwise have been due in week 27.

Check the current fees regulations for the precise mechanism and any exclusions before relying on this, because the fee regime has been amended several times and figures are indexed annually. How the fee schedule is applied and indexed deals with the calculation side.

The refund is not a windfall worth engineering for. On a single dwelling it is a modest sum against the cost of delay. It is worth knowing about because it gives you something to say when an authority asks for a third extension.

Stop the clock practices and their limits

Authorities under pressure develop habits that have no basis in the Order. The common ones are refusing to allocate a case officer until an extension has been agreed, treating a request for further information as suspending the period, and asking for an extension as a precondition of considering amended plans.

None of those suspends the statutory period. The period runs from validation regardless of what the authority does with the file, and the only thing that changes it is a written agreement to extend.

That does not mean confrontation is the answer. The officer asking is usually carrying 60 applications. But knowing the position lets you negotiate rather than comply, and a reply that agrees a specific extension in return for a committed date for the officer's assessment is better than either a flat refusal or an open-ended yes.

Keeping a determination on programme

Most delay is avoidable and most of it originates before submission. The things that move the needle:

1. Submit a valid application, with the fee and certificates right, so week one is week one.
2. Deal with likely consultee concerns in the submission rather than in response to an objection. A Planning Statement that addresses drainage, access and amenity up front removes the most common reasons for a holding response.
3. Pre-empt the statutory consultees. A holding objection takes weeks to clear, and clearing a statutory consultee holding objection explains why avoiding one costs less.
4. Watch the committee calendar. An application reaching a recommendation in week seven, with the next committee in week ten, is going to need an extension whatever anyone wants.
5. Answer officer queries within days rather than weeks.

Where the description of development is causing the difficulty, amending the description of development can sometimes resolve the point faster than argument.

An illustrative example

A self-builder submits a full application for a single dwelling, validated on 3 March. The eight week period expires on 28 April. In week six the case officer asks for an extension to 30 May to allow the lead local flood authority response to be assessed and a revised drainage plan consulted on. The applicant agrees to 30 May specifically, confirms in writing that no further extension is contemplated, and supplies the revised plan within four days. Permission is granted on 22 May. This example is illustrative and not a prediction of how any authority will behave.

When to appeal rather than extend

The test is not whether the authority is in default. It is whether appealing gets you a better answer sooner.

Three situations point towards appealing. The officer has told you the recommendation will be refusal for reasons that are matters of policy judgement rather than fixable detail. The authority has repeatedly sought extensions without progressing the file and the delay is now causing identifiable cost. Or the scheme is finished in design terms and there is nothing left to negotiate.

Three point the other way. The officer is engaging and the objections are soluble. An amendment is in progress. Or the authority's concerns, if they went to appeal unanswered, would be hard to rebut.

Keep a written record either way. A chronology of submission, validation, extensions requested and granted, and queries answered takes ten minutes to maintain and becomes the backbone of an appeal statement or a complaint if you need one. The documents an application needs can be worked out from the report types index before any of this starts.

This is general guidance, not legal advice. Determination periods, appeal deadlines and fee refund provisions are set by regulations that change, so check the current position with your local planning authority or a qualified professional.