Paragraph W and how prior approval procedure works

Paragraph W prior approval procedure is the machinery behind every change of use in Part 3 of the General Permitted Development Order 2015 that needs the council's blessing before it happens. It sits at the end of the Part, after the classes themselves, and it is where the deadlines, the consultation duties and the deemed approval rule live.

Read it alongside whichever class you are using, because the class tells you what is permitted and paragraph W tells you how to get there without losing the right.

What paragraph W governs

Part 3 contains the change of use classes, and most of the useful ones are conditional on prior approval. Commercial, business and service premises to dwellinghouses, agricultural buildings to dwellings, agricultural buildings to flexible commercial use above the lower floorspace threshold, storage and distribution buildings to dwellings, and various routes to state-funded schools all route through the same procedure.

What the authority may consider is limited by the class, not by paragraph W. Each class lists its own prior approval matters, which may include transport and highways impacts, contamination, flooding, noise from commercial premises, the design and external appearance of the building, natural light in habitable rooms and the provision of adequate services. Anything outside that list is not a reason for refusal, however strongly a neighbour argues it.

Paragraph W is not the only prior approval procedure in the Order. The telecommunications rights in Part 16 and the upward extension rights in Part 20 each have their own provisions, and the steps differ. Check which Part you are in before you count days.

The information that must accompany an application

The application has to include a written description of the proposed development, a plan indicating the site and showing the proposed development, the developer's contact address, an email address if the developer is content to receive communications electronically, and the fee set by the current fees regulations. Fees are indexed, so take the figure from the current schedule rather than from an older note.

Where the class attaches prior approval matters, the application also has to address those matters with enough information for the authority to assess them. This is where most refusals start. An authority may refuse the application outright where the information provided is insufficient to determine whether the development complies with the conditions and limitations of the class.

So the practical submission is longer than the legal minimum. For a residential conversion that usually means a transport note, a contamination screening assessment, a flood risk statement where the site is in Zone 2 or 3, a noise assessment where commercial uses adjoin, and daylight information for habitable rooms. The evidential burden under Class Q, proving the building was in agricultural use, shows how far that can go.

Describe the development precisely. The notice the authority issues refers back to the application, and a vague description produces a vague approval that is hard to rely on three years later.

Consultation and neighbour notification

Paragraph W requires the authority to consult specified bodies in defined circumstances, with the local highway authority, the Environment Agency and the relevant transport body among them depending on the class and the site. Consultees get 21 days to respond.

The authority must also notify neighbours. It does this by serving notice on adjoining owners and occupiers, by site display, or by local advertisement, and representations have 21 days to arrive. The authority then has to take any representations received into account, within the limits of the prior approval matters the class allows.

The 21 day periods run inside the determination period rather than extending it, which is what makes the arithmetic tight for the council and worth tracking for the applicant.

The 56 day period and deemed approval

Development may not begin until one of three things has happened. The authority gives notice that prior approval is not required. The authority gives prior approval. Or 56 days have passed from the day the application was received without the authority notifying the applicant of its determination.

The third limb is a genuine deemed approval, and it is the reason to date-stamp everything. Keep the submission confirmation, the fee receipt and any validation email, because the 56 days run from receipt of the application, not from validation.

Two cautions apply. The deemed approval only covers development that actually fell within the class, so an application for something the class never permitted gains nothing from the council's silence. And the development then has to be carried out in accordance with the details provided in the application, which is another reason to describe it precisely.

Counting the days properly matters. The period begins with the day the application was received, and if you start work on day 56 rather than after it, the right has not yet arisen.

Conditions the authority may impose

Where it grants prior approval, the authority may impose conditions, and those conditions have to be reasonably related to the subject matter of the prior approval.

That limit is narrower than it looks in practice. A condition about noise mitigation on a conversion next to a bakery relates to a prior approval matter and will stick. A condition requiring a contribution to open space, or restricting occupancy to local people, does not relate to any prior approval matter in the class and is open to challenge.

Conditions commonly imposed include approval of details before occupation, acoustic glazing and ventilation specifications, remediation of contamination, cycle and refuse storage, and restrictions on the use of external areas. Several classes also impose their own conditions directly, including the requirement in some of them that the development be completed within three years of the prior approval date.

Refusal and the appeal route

A refusal of prior approval is appealable to the Planning Inspectorate in the same way as a refusal of planning permission, and the appeal is determined on the prior approval matters the class allows rather than on general planning merits.

That narrowing cuts both ways. An inspector cannot refuse because the scheme is poorly designed where design is not a prior approval matter for that class, and cannot allow an appeal on the basis that the development would be a good use of a vacant building if a condition or limitation of the class is not met.

Check the appeal deadline on the decision notice itself, since the period depends on the type of application. And consider the alternative: where the refusal rests on insufficient information rather than on a substantive objection, resubmitting with the missing evidence is usually faster than appealing.

Starting work before approval

Beginning development before one of the three triggers is reached means the development is not permitted by the Order at all. It becomes development without planning permission, enforceable in the normal way, and the fallback argument that the authority would have approved it is not available.

Converting a building and then applying is therefore the worst sequence. Several Part 3 classes also require the building to have been in a particular use, or vacant for a particular period, immediately before the date of the application, so works carried out early can destroy the eligibility the application depends on.

Where structural work is involved, the limits on what the class permits bite as well, and the question of what counts as reasonably necessary structural works under Class Q has produced a long line of appeal decisions.

Records to keep afterwards

Prior approval leaves a thinner paper trail than planning permission, and the gap shows up years later on a sale or a refinance.

Keep the following together:

• the application as submitted, including the description and the plan
• proof of the date the authority received it, and the fee receipt
• the authority's notice, or evidence that 56 days expired without a determination
• the approved details for every condition, with the discharge correspondence
• dated photographs and invoices establishing when the development was completed

Where the paperwork is incomplete, a lawful development certificate for an existing use or development is the formal route to put the position beyond doubt, and it is the only way to confirm that what was built is lawful. A short planning statement submitted with the prior approval application also helps, because it records the reasoning while it is fresh.

Enter your postcode on PlanScope to see which reports a prior approval application on your site is likely to need.

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.