Factual errors to look for in a drafted planning document
The writing can be clean while the site area is wrong and the policy reference no longer exists. Where factual errors cluster, and the check that catches them.
Checking planning document errors in a drafted statement is a different job from editing it. The writing can be perfectly clean while the site area is wrong in the third paragraph, the standard is cited without an edition, and one sentence quietly promises the client an approval. Those are the errors that get an application invalidated or a professional embarrassed at committee, and they cluster in predictable places.
What follows is the routine. It works on any draft, whether a machine produced it, a graduate produced it, or you wrote it at eleven at night.
Numbers that appear more than once
Every figure that appears twice is a chance for the two to disagree. Site area, unit count, floorspace, parking spaces, storey heights, distances to boundaries, the number of bedrooms.
Take the application forms as the master. Then check each number in the planning statement, the design and access statement, the transport evidence and the drawing title blocks against them. Where a figure differs, work out which is right before you change anything, because sometimes the form is the wrong one.
Site area is the worst offender. A red line drawn to include an access strip gives a different area from the developable parcel, and a draft that quotes the developable figure while the form quotes the red line figure produces a density calculation that nobody can reproduce.
Density is the second worst. Dwellings per hectare depends on which area you divided by, so state the area you used in the same sentence.
Standards and editions cited without a date
A citation without an edition is not a citation. Acoustic assessments reference a standard that has an amendment year. Tree work references a standard dated 2012. Daylight work references a building research guide with a publication year that changed recently.
The National Planning Policy Framework is the most dangerous of all, because it has been reissued repeatedly and renumbered. The December 2024 edition renumbered the paragraphs of its predecessor, and the edition published on 17 August 2026 replaced paragraph numbers with policy codes in chapters. A draft carrying paragraph numbers from an older edition will cite policy that no longer exists at that reference.
So treat any national policy reference in a draft as unverified until you have opened the current Framework and found it. Never lift a paragraph number from a previous report, a template or a generated draft. This applies to PlanScope drafts as much as to any other source: the drafting is grounded in national policy and local plan text, and it flags gaps, but the reviewer confirms the citation.
Local plan policies need the same treatment. Check that the plan you are citing is the adopted one, that the policy number has not changed on adoption of a review, and that a saved policy you are relying on is still saved.
Site area, units and the conversion trap
One hectare is 10,000 square metres. That is the conversion behind most of the arithmetic errors in planning documents.
Thresholds sit on both sides of it. Major development is triggered at 10 or more dwellings, at 1,000 square metres or more of floorspace, or at 0.5 hectares or more. A flood risk assessment is expected on sites of one hectare or more regardless of flood zone. A draft that describes a 0.62 hectare site as 6,200 square metres is right; one that calls it 620 square metres has moved the scheme out of a category it belongs in.
Gross and net floorspace is the other trap. Gross internal area, net internal area and gross external area are different numbers, and a threshold expressed in one of them cannot be tested against another. Say which measure you are using.
Compass directions and neighbouring relationships
Read every sentence describing the site's surroundings with the site plan open in front of you. Drafts describe the neighbour to the north when the plan shows them to the east, and nobody catches it because the sentence reads well.
Directions carry consequences. Overshadowing arguments depend on which side the sun travels, so a boundary described in the wrong direction produces a daylight and sunlight conclusion that is exactly backwards. The same applies to prevailing wind in odour and noise work, and to the orientation of solar arrays in an energy statement.
Check the relationship statements too. A draft saying the site is bounded by residential properties on three sides, when the fourth side is also residential across a lane, invites an objector to point it out.
Statements about council behaviour
Delete anything that asserts what a council usually does unless you can point to the document that says so.
The offending sentences look like this: "the council normally requires", "this authority typically expects", "officers generally accept". They read as knowledge and they are guesses.
Replace each one with either a reference to the council's published validation checklist, its adopted supplementary guidance or its charging schedule, or with a plain statement of the national requirement. Where you do not actually know, write that the position should be confirmed with the authority.
The same applies to appeal decisions. An inspector's decision on another site is indicative of how that issue has been approached, not a precedent binding the council, and a draft that describes it as settled law is wrong.
Any sentence that promises an outcome
Search the draft for the words will, guarantee, ensure, comply and fully.
A planning document can argue that a proposal accords with policy. It cannot say that permission will be granted, that a scheme fully complies with every requirement, or that an objection will fail. Beyond the professional risk, those sentences damage the document, because a decision-maker reading an overclaimed statement discounts the rest of it.
Hedge accurately rather than everywhere. One honest sentence acknowledging the point an objector will make, followed by the answer, reads better than a document that pretends the issue does not exist.
A five minute check before submission
Run this in order, on a printed copy or a PDF rather than the editing window.
- Search the document for square brackets. Placeholders and flags such as [TO BE CONFIRMED] are inserted deliberately where site-specific facts are missing, and they are useful right up to the moment they get submitted.
- Search for the site address and check every instance, including the header and the drawing references.
- Reconcile every number against the application forms.
- Check every standard, guide and policy citation has an edition or date, and that the date is current.
- Read every compass direction against the site plan.
- Search for "will", "ensure", "guarantee", "fully" and "always", and soften or evidence each one.
- Check the description of development matches the forms word for word.
That is the whole routine, and on a typical statement it takes less time than one round of comments.
An illustrative example: a draft planning statement for an infill site quoted the site area as 0.08 hectares in the introduction and 0.8 hectares in the density calculation, cited a tree standard without its year, and described the rear boundary as facing south when the plan showed north. All three survived two rounds of design comments, and the second was caught only when the council's arboricultural officer queried the survey methodology. This example is illustrative rather than a real case.
Where a document needs a specialist to stand behind it, a reviewer from the professional directory can check and sign off a draft, and for report types where a licensed or competent professional is legally required that review is not optional. You can see PlanScope pricing for the free report, the £50 per report option and the Professional tier, or browse the 66 report types by category.
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.
Frequently asked questions
Why do policy citations go wrong so often?
Because the National Planning Policy Framework has been reissued and renumbered more than once. The December 2024 edition renumbered its predecessor's paragraphs, and the edition published on 17 August 2026 replaced paragraph numbers with policy codes. Any reference lifted from an older report, a template or a generated draft is likely to point at policy that no longer sits at that reference.
What are the square bracket flags in a draft?
They mark site-specific facts the draft could not establish. PlanScope inserts a flag such as [TO BE CONFIRMED] rather than inventing a figure, which is a deliberate safeguard. The flags do their job right up to the moment a document is submitted with them still in place, so searching for square brackets is the first check before submission.
How do I check density figures?
State the area you divided by in the same sentence as the result. Density changes depending on whether you used the red line area, the developable parcel or the net residential area, and a reader who cannot reproduce your arithmetic will assume the higher figure. One hectare is 10,000 square metres, and most arithmetic errors in planning documents sit on that conversion.
Can I cite an appeal decision as precedent?
Describe it as indicative rather than binding. An inspector's decision shows how that issue has been approached on similar facts, which is useful, but it does not bind the council and a draft that presents it as settled law invites a correction in the officer report. Give the appeal reference and the date so the reader can check it.
Which words signal an overclaim?
Will, guarantee, ensure, comply and fully. A planning document can argue that a proposal accords with policy, but it cannot promise a decision or claim complete compliance with every requirement. Decision-makers discount documents that overclaim, so answering the objection directly is more effective than writing as though it does not exist.
Sources and further reading
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.