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Why Do Our Planning Applications Keep Coming Back as Invalid, and How Do We Stop It?

Architects lose weeks when a council returns a planning application as invalid. We build a pre-submission check against each council's local validation list.

Updated 3 min readBy SpiderHunts Technologies

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Quick answer — TL;DR

Planning applications come back invalid because each council has its own local validation list on top of the national requirements, and the checklist is kept in someone's head or an old spreadsheet. We build a pre-submission check that holds each council's current requirements, asks what the application involves, lists every document and drawing needed, and checks the submission pack against it before anything is uploaded to the Planning Portal.

The email that says 'your application is invalid'

The householder application went in through the Planning Portal a week ago. The clients are keen, the design is good, and everyone is waiting for the consultation period to begin. Then an email arrives from the council's validation team. The application cannot be validated: the location plan does not show the red line to the road, there is no heritage statement even though the site is in a conservation area, and the existing and proposed elevations are not at a stated scale.

Each fix is small. But the clock only starts once the application is valid, so the clients lose weeks, and the architect has to explain why.

Why validation catches practices out

There are national requirements that apply everywhere, and then each local planning authority adds its own local list. Local lists differ: one wants a bat survey trigger checklist, another a sustainability statement, another a specific form of parking plan. They are updated from time to time, and the updates are published on council websites where nobody is watching for them.

  • Local validation lists differ between councils and change over time.
  • The practice's checklist is out of date or in one person's head.
  • Triggers, such as conservation area, listed building or flood zone, add documents that are easy to forget.
  • Drawing requirements, such as scale bars, north points and red lines, are missed under time pressure.
  • Nobody checks the final pack as a whole before it is uploaded.

What an invalid application costs

Time is the obvious one: the determination period does not start until the application is valid. Clients lose confidence. Staff spend time on resubmissions rather than design. And where fees are fixed, the extra work comes straight off the project's margin.

A pre-submission check, council by council

  1. We record the national requirements and each council's local validation list for the authorities you work with, with the date each was last checked.
  2. A scheduled job checks those councils' validation pages for changes and alerts you when a list appears to have been updated, so the checklist can be reviewed.
  3. For each application, the architect answers a few questions: council, application type, and triggers such as conservation area, listed building, flood zone, trees or new dwellings. The site pack from feasibility can answer some of these automatically.
  4. The check produces the list of forms, drawings, statements and surveys required for that application, with notes from the local list.
  5. The draft pack is dropped in, and each document is matched to a requirement. Missing items are listed.
  6. Drawings are checked for basic items the council requires, such as scale, scale bar, north point, drawing title and the red line on the location plan, with anything uncertain flagged for a person to look at.
  7. The architect signs off the check, and the result is filed with the project before submission.

Validation decisions are made by the council. The check reduces avoidable omissions. It does not guarantee an application will be validated, and planning judgement remains with the architect.

An example requirement list

RequirementWhy it appliesIn the pack?
Application form and certificateAll applicationsYes
Location plan with red lineAll applicationsYes, red line flagged for check
Heritage statementConservation area triggerMissing
Flood risk assessmentFlood zone triggerNot required here
Local list item, such as a parking planCouncil local listYes

Illustrative only. Your councils' lists define the real requirements.

Applications that go in complete

Applications leave the office with a pack that has been checked against the council's current list, not against memory. Juniors can prepare applications with the same confidence as the person who has done hundreds. And when a council changes its local list, the practice finds out when the change is made, not when an application is rejected.

Has this happened to your practice?

  • Applications have been returned as invalid for missing documents.
  • Your validation checklist is old or unofficial.
  • Different councils' local lists catch you out.
  • Only one or two people really know what each council wants.

FAQ

Frequently asked questions

The questions readers ask us after this guide.

Still have a question?

Ask us directly — a senior engineer will get back to you.

Ask about your project

Does this submit the application for us?

No. You submit through the Planning Portal or the council's own route as now. The check happens before that.

Can it keep up with changes to local lists?

It watches the councils' published pages and alerts you to likely changes, and someone reviews and updates the checklist. It cannot promise to catch every change.

Will it read our drawings?

It checks for basic required elements on PDF drawings and flags uncertain ones. It does not assess the design.

What affects the cost?

The number of councils you work with, the application types covered and whether it links to your site research and document storage.

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