Why the Planning Inspectorate returns appeals as invalid

An appeal returned as invalid has not been made. The Planning Inspectorate checks submissions against a defined list before starting a case, and where something is missing it writes back setting out what is needed. If the deadline has passed by the time you fix it, there is no appeal, and no discretion to accept a late one on a householder case.

That is why the validation stage deserves the same attention as the planning argument. Most returns are avoidable, and the reasons repeat.

The documents an appeal must include

The Inspectorate needs a complete picture of what the council decided on, not an abridged version of it. A standard planning appeal submission carries the appeal form, a copy of the original application form, the site location plan with the application site edged red, copies of every plan and drawing that formed part of the application, the decision notice, and your full statement of case or grounds of appeal.

Two supporting items are missed more than the rest. The list of plans, identifying each drawing by number and revision, is what the inspector uses to define the scheme, and an appeal with plans that do not match the list is queried immediately. And the supporting documents the council relied on, such as a design and access statement or a heritage statement, need to go in even where you no longer place weight on them.

Send the same package to the local planning authority on the day you lodge. Failure to do so is one of the ordinary reasons for a return.

Ownership certificates and notices served

The certificate on the appeal form repeats the certificate given at application stage under the Development Management Procedure Order, and it has to be right at the date of the appeal rather than the date of the application.

Certificate A applies where you own the whole of the site. Certificate B applies where someone else has an interest and you have served notice on them. Certificates C and D deal with owners you cannot trace. Where ownership has changed since the application, or where part of the access strip turns out to belong to a neighbour, the certificate changes and notice has to be served again.

Agricultural holdings need their own notice. A site in agricultural tenancy where the tenant has not been notified will be returned, and serving notice after the deadline does not cure it.

Getting the appeal type and the procedure right

Choosing the wrong route is a common return, and the consequences differ by route.

The householder route only covers applications for development within the curtilage of a dwellinghouse that were decided as householder applications. An application for a new dwelling in a garden is not a householder appeal, however domestic it feels, and lodging it on the wrong form wastes the time it takes to be sent back.

You express a preference for written representations, a hearing or an inquiry, and the Inspectorate decides. Ask for an inquiry only where there is evidence to test through cross-examination, since an unjustified request adds months. Where the choice is between appealing and going back in, the reasoning in choosing between a free go resubmission and an appeal is worth working through before anything is lodged.

Form errors that cause a return

The recurring ones are dull and entirely preventable.

• The site address on the appeal does not match the address on the decision notice.
• The description of development has been rewritten rather than copied from the decision notice.
• The decision notice attached is for a different application on the same site.
• The appellant named is the agent rather than the client, or a company that did not make the application.
• The grounds of appeal are missing because the appellant intended to send them later.
• The appeal relates to conditions but the form is completed as a refusal appeal, or the reverse.

On a section 78 appeal against conditions, identify the condition numbers precisely and state what you say each should be replaced with. Where the target is a condition on a permission rather than the refusal itself, consider whether the route should have been a section 73 application instead, because the limits explored in section 73 refusals and varying conditions sometimes make the appeal the wrong vehicle.

Late appeals and why they are not accepted

The time limits sit in legislation, not in Inspectorate practice. For householder appeals the twelve week period is treated as absolute, and the Inspectorate has no power to take a late appeal. For other appeal types a discretion to allow a longer period exists in principle, and it is exercised rarely and on exceptional facts.

Count the period from the date on the decision notice, not the date you received it or the date your client instructed you. Where the council issued a decision and then reissued a corrected version, take advice on which date runs, because the answer is not always the later one.

Appeals are lodged electronically and the system records the submission time. Submitting at 23:55 on the last day works if everything is attached, and does not if the statement upload fails.

Curing a defect before the deadline

The Inspectorate's letter tells you what is missing and usually gives a period to respond. If the original deadline has not expired, supplying the missing item within that period generally results in the appeal being started with the original date.

So lodge early. An appeal submitted in week four of a twelve week window has eight weeks of room for a return and a resubmission. One submitted on the final afternoon has none, and a single missing drawing ends it.

Where an appeal has already been decided and you think the inspector made a legal error, the appeal validation route is closed and the remedy is a statutory challenge, as set out in challenging an appeal decision in the High Court.

A submission checklist

Before you press submit, confirm that the appellant name matches the applicant, the description matches the decision notice word for word, every plan on the list is attached and numbered, the certificate reflects ownership today, the notices have been served and dated, the statement is complete because you cannot add to it on the householder route, the decision notice attached is the right one, and the whole package has gone to the council.

Keep the submission confirmation and the file of what was sent. The written case itself is a separate discipline, and a Planning Statement drafted against the reasons for refusal gives the inspector the policy argument in a form they can follow.

This is general guidance, not legal advice. Check the position with the Planning Inspectorate 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.