Article 12 – Validation dispute: challenging what a council asks for

A validation dispute is the formal route for telling a council that it has asked for more information than the rules allow before it will validate your planning application. When a local planning authority refuses to register an application until you supply particulars or evidence you believe are excessive, Article 12 of the Development Management Procedure Order gives you a way to challenge that demand rather than simply comply or walk away.

Serving an Article 12 notice is straightforward and carries no separate application fee, but the consequences matter because an unresolved dispute can lead into a non-determination appeal. The procedure is little used and often overlooked, even by professionals. This guide explains what a validation dispute is, when it is worth raising one, how Article 12 works, and how it connects with the determination clock and the Planning Inspectorate.

 

 

 

 

What a validation dispute actually challenges

 

When you submit a planning application, the council checks it against the national requirements and its published local validation requirements before registering it as valid. Ordinarily, if required information is missing, the application will not be treated as valid. Article 12 is the important exception. If the missing item is local-list information that you formally dispute, Article 34(5) can treat the application as a non-validated application without that disputed information. The statutory determination period can therefore run even though the council still says the item is required.

A validation dispute is not an argument about whether your application is any good. It is narrowly about one thing: whether a particular item the council insists on is something it is actually entitled to require. The benchmark is set by Article 34(6) of the Development Management Procedure Order, which limits what a council can demand as a local validation requirement. A demanded item must:

• fall within a list of requirements the council has published, or republished, on its website within the two years before you made the application
• be reasonable having regard, in particular, to the nature and scale of the proposed development
• relate to a matter it is reasonable to think will be a material consideration in the determination of the application

If an item the council is demanding fails any of those tests, you have grounds to challenge it. One detail is worth knowing: an Article 12 notice is aimed at the two tests in Article 34(6)(c), reasonableness and material consideration. The published list and two year points sit in Article 34(6)(a), (b) and (d), so raise those with the council directly as well.

 

How the Article 12 procedure works

 

The procedure is a short exchange of notices. You start it, and the council must respond within a fixed period.

First, you send the council a notice. It must specify which particulars or evidence you consider fail the Article 34(6)(c) requirements, set out the reasons you rely on for taking that view, and request that the council waive the requirement to include those items in the application.

The council must then reply with one of two things. A validation notice confirms it no longer requires you to provide the items, so the point is conceded and the application can proceed without them. A non-validation notice confirms it still requires them, so the demand stands and you must either supply the items or consider your other options.

The council does not have an open-ended time to answer. It must reply by the date the determination period for your application ends. There is an important exception: if your Article 12 notice reaches the council during the seven working days immediately before that period ends, or on the final day or after the end of that period, the council instead has seven working days from the day it received your notice. “Working day” here excludes weekends and public holidays.

One practical consequence is worth flagging. If the Article 12 notice is received before the final seven working days of the ordinary determination period, the usual Article 34 timetable continues. If it is received during those final seven working days, on the final day, or after that period has already expired, Article 34(3) substitutes a new period of seven working days beginning with the date the council receives the Article 12 notice. So serving the notice after the original eight or thirteen weeks have expired does not mean you can appeal immediately: the seven-working-day period must first run its course.

 

When it is worth raising one, and when it is not

 

A validation dispute is a useful tool, but it is not always the right move, and raising one carries a cost of its own in delay and goodwill. It is worth thinking hard about whether to use it.

It tends to be worth raising where the council is demanding an expensive technical report, a survey, or a level of detail that looks out of proportion to a modest proposal and you have a good argument that the requirement fails the Article 34(6)(c) tests of reasonableness or materiality. If the problem is instead that the item is not on a published and current local list, or the list has not been republished within two years, raise that point with the council directly as well: those requirements sit elsewhere in Article 34(6), rather than within the specific test an Article 12 notice asks the council to waive. Before raising a dispute it is worth reading what a council can lawfully require in the first place, which we set out on our validation requirements page.

It is usually not worth raising where the information requested is plainly relevant and modest to produce, or where supplying it would take less time and cost less than the dispute itself. Article 12 also has a limit of scope worth knowing: it bites on particulars or evidence required under a council’s local list, so it is no help at all against a national requirement such as the ownership certificate, or a design and access statement where article 9 requires one. Article 12 decides only whether the item can be required, not whether your application succeeds, so winning the point still leaves the substantive decision entirely open. If the council maintains its position with a non-validation notice, that does not end the route. Once the applicable Article 34 determination period has expired without a decision, you can consider a section 78 non-determination appeal, at which point the Planning Inspectorate can consider both the validation dispute and the planning merits. That makes Article 12 more useful than a simple request for a waiver, although an appeal still brings its own time, cost and risk.

 

Cost, and what happens if the council refuses

 

There is no separate fee for raising a validation dispute; it is part of the application process, not a standalone application. The cost that matters is the application fee itself, which the council will still expect, and the value of any report or survey you avoid having to commission if your dispute succeeds. Fees are set nationally but the framework changed under the Planning and Infrastructure Act 2025, so check the current position on our planning fees guide rather than relying on a figure quoted elsewhere.

An Article 12 notice does not create a separate appeal against the council’s non-validation notice. Instead, Article 34(5) treats an application which contains everything required except the disputed local-list particulars or evidence as a non-validated application. Article 34 then applies a determination period to that application, which is what opens the door to the normal section 78 route if the council still does not determine it.

 

How the non-determination appeal works

 

Once the applicable Article 34 determination period has expired without the council granting or refusing planning permission, the applicant may appeal under section 78(2) of the Town and Country Planning Act 1990 for non-determination. Government guidance is explicit that, for this purpose, the statutory period is treated as having started when the council received the fee, documents and other information needed for the application, excluding the disputed information identified in the Article 12 notice. The Planning Inspectorate then considers both the merits of the validation dispute and the planning appeal itself. The government’s planning application guidance confirms this route.

That means the sequence is usually: Article 12 notice → validation or non-validation notice → expiry of the applicable Article 34 period → section 78 non-determination appeal. If the Article 12 notice was served late enough to trigger Article 34(3), remember that the seven-working-day period created by that provision has to expire before the non-determination appeal is made.

For most planning applications, a non-determination appeal must be received within six months from the expiry of the applicable determination period. A shorter deadline can apply where an enforcement notice has been served, and advertisement appeals have different time limits, so always check the particular case. Our non-determination appeal guide explains the deadlines in more detail.

 

What does the Inspector decide?

 

The Inspector does not simply decide whether the council should have validated the application and send everyone back to square one. The validation issue forms part of the appeal. The Inspector must resolve whether the disputed information met the Article 34(6)(c) tests and, where the application can properly proceed without it, then determine the planning merits in the usual way.

A useful recent illustration is APP/K3605/W/25/3374058, The Warehouse, Thames Street, Weybridge, decided on 4 March 2026. The application had not been validated because the council continued to require updated technical reports. The Inspector treated the applicant’s correspondence as an Article 12 notice, treated the council’s maintained position as a non-validation notice, applied the non-determination route and ultimately allowed the appeal. It is an Inspector decision rather than binding case law, but it is a very clear example of how Articles 12 and 34 work in practice.

For appeals relating to applications submitted on or after 1 April 2026, a non-determination appeal is not one of the section 78 appeals that automatically follows the expedited Part 1 written representations procedure. If it is dealt with by written representations, it follows Part 2; the Planning Inspectorate can instead select a hearing or inquiry where appropriate. Under Part 2 the appellant must submit a full statement of case when the appeal is made. In an Article 12 case that statement should deal with both the validation argument and the likely planning objections, because the Inspector may have to decide both. See the Planning Inspectorate’s current planning appeals procedural guide.

If you do not want to take the matter to appeal, the practical alternative is still to provide the disputed information and let the application proceed. For the appeal deadline and the wider process, see our non-determination appeal guide and our main planning appeals section.

Before you get to a dispute at all, it is worth making sure the application itself is well prepared, since a lot of validation friction comes from missing or unclear drawings. Our guides to the drawings a planning application needs and the difference between block, site and location plans cover the ground councils most often query, and understanding the application timescales helps you see where an Article 12 notice sits in the clock.

See also our guide to the types of planning application.

 

Validation dispute relevant legislation

 

The validation dispute procedure is set out in Article 12 of the Development Management Procedure Order. Article 34 is just as important: it defines the non-validated application, sets the normal determination periods, creates the special seven-working-day period for a late Article 12 notice and contains the statutory tests for local-list information. The eventual non-determination appeal is made under section 78 of the Town and Country Planning Act 1990. This page focuses on England; validation procedure is devolved and differs elsewhere in the UK.

• Article 12, Town and Country Planning (Development Management Procedure) (England) Order 2015: validation dispute
• Article 34 of the same Order: valid and non-validated applications, determination periods and local-list requirements
• Section 78, Town and Country Planning Act 1990: the planning appeal and non-determination route
• Town and Country Planning (Development Management Procedure) (England) Order 2015: full contents

Other Planning Application Sections

 

 

 

 

Validation Dispute Page Updated: 28th August 2026