Prior approval refusals and the limited scope of appeal

An appeal against refusal of prior approval is a narrow exercise. Where permitted development is granted by the General Permitted Development Order subject to prior approval, the Order lists the matters on which approval is required, and nothing else is in issue. An inspector deciding a prior approval appeal is therefore asking whether the authority was right about those listed matters, and is not weighing the scheme in the planning balance the way a section 78 appeal against refusal of full permission does.

That narrowness cuts both ways. It removes most of the grounds an authority would like to rely on, and it also removes most of the arguments an applicant would like to make about design quality, housing need or local benefit.

Why the appeal is confined to the listed matters

Permitted development is a grant of planning permission by the Order itself. The right already exists, subject to the limitations in the class and the conditions attached to it. Where one of those conditions requires the prior approval of the authority, the Order specifies what the authority may consider.

Under Class MA of Part 3 of Schedule 2, which allows commercial, business and service use to change to dwellinghouses, the prescribed matters cover transport impacts of the development, contamination risks on the site, flooding risks, impacts of noise from commercial premises on the intended occupiers, the provision of adequate natural light in all habitable rooms, and in certain cases the effect of the loss of the ground floor use or the impact of introducing residential use into an area important for industry, storage, distribution or waste.

Design is not on that list. Nor is affordable housing, nor amenity space, nor the character of the conservation area as such, nor whether the resulting flats are small. Those are the complaints authorities most often have about a Class MA conversion, and they are the complaints the Order gives them no power to act on.

Where an authority strays outside its remit

Refusal notices on prior approval applications quite often read like refusals of a full application. The reasons cite a design policy, an amenity policy, or a space standard the authority has adopted locally.

Where that happens you have two routes. The first is to appeal and point out, in the statement of case, that the reason relies on a consideration outside the prescribed matters, with the relevant sub-paragraph of the class quoted. Inspectors deal with this quickly and the appeal is often allowed on that basis alone. The second, where the error is obvious and the relationship with the authority is worth preserving, is to write to the officer before appealing and ask them to reconsider, since a withdrawn refusal avoids four months of waiting.

Watch for the subtler version. An authority can legitimately refuse on a prescribed matter while using language that sounds like a design objection, for instance refusing on inadequate natural light to habitable rooms where the real concern is a deep floorplate. That is within the remit and needs answering on the merits with daylight modelling rather than on jurisdiction.

Evidence for the prescribed matters

Each prescribed matter has a conventional evidence base, and an appeal is won or lost on whether that evidence was before the authority in the first place.

Two of those routinely get skimped. The noise case needs a measured survey rather than a desk assessment where there is a pub, a takeaway, a gym or a workshop nearby, and a Noise Impact Assessment with glazing and ventilation specifications attached is far harder to refuse. The transport case is not about absolute trip numbers; it is a comparison with the trips the existing lawful use could generate, and a Transport Statement framed that way answers most highway objections on conversions.

Timing and the 56 day period

Prior approval applications under Part 3 run to a 56 day determination period. If the authority neither grants nor refuses within that period, the development may generally proceed in accordance with the submitted details, subject to the precise wording of the class.

That is a right worth protecting rather than relying on. Three practical steps: submit a complete application with every prescribed matter addressed, keep the email confirming the date the application was received, and diarise day 56. Where the authority asks for further information late in the period, supplying it does not extend the clock unless both sides agree, and an agreement to extend should be recorded in writing.

Where the authority refuses on day 55 with reasons outside the prescribed matters, you have a choice between the appeal and a second application. The appeal preserves the point of principle. The second application is quicker if the refusal identified a genuine evidence gap.

Resubmission compared with appeal

Appeal when the refusal is wrong in law or wrong on the technical merits and your evidence already answers it. Resubmit when the refusal identified something you did not supply.

The arithmetic favours resubmission more often than applicants expect. A prior approval appeal through written representations takes months, during which the building sits empty, and the appeal is decided on the information that was before the authority. A second application with the missing noise survey and daylight calculations can be determined within another 56 days. Our note on reading a refusal notice and turning it into a plan works through the same choice for full applications.

The case for appealing anyway is where the authority is applying a policy it has no power to apply and is likely to do so again on your next scheme. A decision letter saying so is useful.

Costs where the authority exceeded its powers

Costs may be awarded in appeals where a party has behaved unreasonably and caused another party unnecessary expense. Refusing prior approval for reasons the Order does not permit, and maintaining that position in an appeal statement, is the kind of conduct that has attracted awards.

Make the claim properly or not at all. That means setting out the unreasonable behaviour, when it was pointed out to the authority, and what it cost, with the correspondence attached. A claim asserted in one line at the end of a statement of case tends to fail.

Preparing the second attempt

Whichever route you take, the second submission should be built around the refusal reasons as a checklist. Address each prescribed matter under its own heading, with the supporting document named, so the officer can tick through them. Include a short covering statement that says what has been added since the first application.

The qualifying conditions for Class MA have been amended more than once, including changes in 2024 to the floorspace threshold and the vacancy requirement, so read the current text of the class on legislation.gov.uk before you rely on eligibility. Getting that wrong produces an invalid application rather than a refusal, and the 56 day clock never starts.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. A Lawful Development Certificate is the only formal way to confirm that works or a use are lawful. PlanScope drafts the supporting statements for a prior approval application structured to UK planning policy, with flags where site evidence is missing. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Browse the 66 report types to see what a conversion submission usually needs.