AI and Planning

Editing a draft to match a local validation checklist

6 min readBy PlanScope Editorial Team

Most validation failures are administrative. Here is how to map documents to a specific authority's local list, name the files correctly and justify what you leave out.

A local validation checklist is the list of documents a particular authority requires on top of the national requirements, and it is the reason an application prepared perfectly well for one council gets returned by the next. Editing a drafted document set to match it is a mechanical exercise, but it has to be done against the current published list, because the items change and the version saved on your server from the last job is probably out of date.

Two thirds of validation failures are administrative rather than technical. A missing certificate, a plan without a scale bar, a document named in a way the authority's system rejects.

Finding the current local list

Authorities must publish their local list, and Planning Practice Guidance expects it to be reviewed regularly, generally at least every two years. Find the published version with its date on the council's own website rather than working from a copy.

Two checks are worth making every time. Is the list in date, and does the authority operate different lists for different application types. Many do, with separate requirements for householder, minor, major and listed building consent applications, and the householder list is often much shorter than people assume.

Where the list is more than two years old, that is a fair point to make if the authority later insists on an item that is no longer justified. The requirement has to be reasonable, and relevant to the application in question.

Mapping each requirement to a document

Build a two-column table before touching the drafts. Left column, every item on the national and local lists. Right column, the document in your set that answers it, with its filename.

The mapping exposes three things quickly. Items with no document, which is the obvious gap. Documents with no item, which are either useful additions or clutter. And items answered by half of a document, which is the difficult case.

That third case is where most editing time goes. An authority asking separately for a sustainability statement and an energy statement will not accept one document labelled as both, even where the content covers everything. Split it, retitle each part, and cross-reference. Where a Planning Statement covers policy compliance and the local list also asks for a separate affordable housing statement, the affordable housing content has to come out into its own file.

Thresholds inside the local list

Local lists are full of conditional requirements. A tree survey where trees are within a stated distance of the works. A transport statement above a floorspace figure. A daylight assessment where a scheme exceeds a given height or sits within a set distance of residential windows.

Read the trigger, not the heading. A requirement that reads "where the site is within 250 metres of a watercourse" needs measuring rather than guessing, and the measurement should be recorded so you can justify the answer later.

Thresholds also interact with national requirements. A Design and Access Statement is required nationally for major development and for certain applications in designated areas, and the local list may add categories on top. Satisfy both.

Naming and formatting so the file is accepted

This is the dull part that causes the delays. Most authorities publish a document naming convention, and their systems reject or mislabel files that do not follow it.

Five rules cover almost every authority.

  1. Name each file for what it is, using the authority's own terminology from the local list.
  2. Include the drawing number and revision in the filename for every drawing.
  3. Submit one document per file rather than a merged bundle, unless the authority asks for a bundle.
  4. Keep each file inside the portal's size limit, and check the current limit rather than assuming.
  5. Use a consistent scale bar and north point on every plan, and never submit a drawing marked as not to scale where a scale is required.

Drawings are the usual casualty. A location plan at the wrong scale, or a site plan showing the red line around the building rather than around the whole application site including the access, is a same-day rejection at most councils.

Explaining why a listed document is not needed

You are allowed to say a requirement does not apply. Do it properly, in writing, in a short covering letter rather than by silence.

State the item, state why it is not engaged, and give the evidence. "The local list requires an arboricultural impact assessment where works fall within the root protection area of a tree over 150 mm in diameter. The nearest such tree is 14 metres from the proposed foundations, as shown on drawing 104 rev B, so no assessment is submitted."

Silence gets the application returned. A reasoned explanation gets a phone call at worst. Validation officers are generally willing to accept a justified omission and generally unwilling to chase an applicant who has simply left something out.

Pre-validation enquiries that save a week

Several authorities offer an informal document check before submission, sometimes free, sometimes as part of a pre-application service. Where it exists, use it.

Where it does not, an email to the validation team listing your proposed document schedule and asking whether anything is missing usually gets an answer within a week. That costs less than a return, because a returned application loses its place in the queue entirely and the fee has to be re-paid in some systems.

Ask specifically about the items you have omitted and the reasons, rather than sending a generic list.

Keep the reply. If the application is later returned for an item the validation team told you was not needed, the email settles it in one exchange rather than three.

Keeping a reusable checklist per authority

Build a file per authority and keep it current. Record the local list version and date, the naming convention, the portal quirks, the validation officer's preferences and anything that went wrong last time.

Review it at the start of each job rather than trusting it. Lists change, and an authority that merged with a neighbour will often have two inherited lists running in parallel for a period.

The file pays for itself on the second application to the same council. It pays for itself twice over when a colleague picks up a job in an area they have never worked in and finds the quirks already written down.

An AI-assisted draft gives you the content quickly. Matching it to a specific authority's list is judgement work: deciding which requirements are engaged, splitting documents, writing the justification for omissions. PlanScope drafts are structured to UK planning policy and flag where site facts are missing, and they still need that local mapping done by someone who has read the council's list.

Where a document needs a qualified author, the reviewers in the professional directory are the route to sign-off, and the pricing page sets out what a draft costs before that step.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.

Frequently asked questions

How often are local validation lists updated?

Planning Practice Guidance expects authorities to keep local lists under review and to update them regularly, generally at least every two years. Always work from the dated version published on the council's own website. Where a list is well out of date, that is a fair point to raise if the authority insists on an item that is no longer justified.

Can I refuse to provide a document on the local list?

You can explain in writing why a requirement is not engaged, and authorities frequently accept that. Set out the item, the reason it does not apply and the evidence, in a short covering letter. What gets an application returned is silence, not a reasoned omission that the validation officer can check.

Why do drawings cause so many validation failures?

Because the checks are mechanical. A location plan at the wrong scale, a missing north point or scale bar, or a red line drawn around the building rather than the whole application site including the access will all trigger a return. Check the authority's stated drawing requirements before export, not after.

Does a single document satisfy two list items?

Usually not. Where an authority lists a sustainability statement and an energy statement separately, it will expect two files even if one document covers both subjects. Split the content, retitle each part to match the authority's own terminology, and cross-reference between them rather than merging.

Is there a way to check documents before submitting?

Several authorities offer an informal pre-validation document check, sometimes within a pre-application service. Where none exists, email the validation team your proposed document schedule with your reasons for any omissions. A week's wait is far better than a return, which loses your place in the queue.

Sources and further reading

validationlocal listplanning applicationdocument managementai drafting

This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.

More in AI and Planning

View all →
AI and Planning7 min read

Keeping an audit trail for a machine-drafted document

The record of which source each fact was checked against, by whom and when, is what answers a cross-examination in a sentence instead of a week of reconstruction.

Read article →
AI and Planning7 min read

Why a site visit cannot be skipped

Datasets give you flood zones and listing entries. Levels, boundary positions, neighbouring window heights and visibility splays come from standing on the plot with a tape measure.

Read article →
AI and Planning7 min read

Splitting the drafting from the judgement calls

Two thirds of a planning statement records facts that already exist. The rest is argument that carries liability. Knowing which is which decides where consultant time is worth paying for.

Read article →
AI and Planning7 min read

Spotting invented case law in a planning document

A fabricated citation looks right. The two failures are a reference that does not exist and a real case cited for something it does not say. The second slips through more often.

Read article →
AI and Planning7 min read

The limits of a desk-based heritage statement

Significance sits in the fabric, so it has to be inspected. Desk work can carry the duties, the asset inventory and the methodology, but never the assessment itself.

Read article →
AI and Planning7 min read

What AI cannot do in a biodiversity net gain assessment

Habitat type and condition are observed on site by a competent person. That is why a drafted document can carry the narrative of a BNG assessment but never the baseline.

Read article →