Why a drafted heritage statement cannot assess significance
A draft can state the statutory duties and the method correctly. It cannot tell you the cornice is a 1960s replacement, which is the part the decision turns on.
A heritage statement stands or falls on its assessment of significance, and significance is a judgement about one particular building, formed by someone who has stood in it. That is why an AI heritage statement significance section is the part of any draft you should trust least and check hardest. A model can set out the statutory duties, the policy framework and the method correctly. It cannot tell you that the first floor cornice is a 1960s replacement, or that the plan form of the rear wing survives almost intact behind later partitions.
The statutory duties fall on the decision maker
Three duties frame the whole exercise. Section 16(2) of the Planning (Listed Buildings and Conservation Areas) Act 1990 requires the authority, in considering listed building consent, to have special regard to the desirability of preserving the building, its setting and any features of special architectural or historic interest it possesses. Section 66(1) imposes the same duty on planning applications affecting a listed building or its setting. Section 72(1) requires special attention to be paid to the desirability of preserving or enhancing the character or appearance of a conservation area.
The Court of Appeal has held that these are strong duties rather than ordinary material considerations, and that considerable importance and weight must be given to the desirability of preserving a listed building and its setting when the balance is struck.
That matters for the drafting question. The decision maker has to perform the duty on evidence, and the evidence of what the asset's significance consists of has to come from the applicant. A statement that asserts significance without demonstrating it leaves the officer unable to discharge the duty, which is why these are returned so often.
Significance is about one asset
Significance in this context is the sum of the heritage interest an asset holds: archaeological, architectural, artistic and historic. Those categories are national. Their content is specific to the building in front of you.
Consider two Grade II listed early nineteenth century terraced houses on the same street. One retains its original staircase, shutters, lath and plaster ceilings and a rear closet wing. The other was gutted in 1988, has modern joinery throughout, and keeps only the facade. Their list entries may be almost identical, and their significance is entirely different, which means the acceptable interventions are entirely different too.
No amount of policy text or list entry wording gets you from the first case to the second. The difference is visible only on inspection, and the inspection has to be done by someone who knows what a 1988 architrave looks like.
This is the same problem that arises with design, where the judgement lives on the site rather than in the policy, as where site judgement cannot be drafted in a design statement sets out.
What a draft can legitimately supply
A good deal, in fact, and it is worth being precise about what is useful rather than dismissing the whole thing.
A draft can set out the statutory duties accurately with their section numbers. It can frame the structure of the assessment in the order a decision maker needs it. It can summarise the policy position, including the distinction the Framework draws between substantial harm and less than substantial harm and the requirement for clear and convincing justification. It can list the sources that should be consulted. It can set out the method from Historic England's advice on managing significance and on statements of heritage significance. And it can flag, explicitly, every place where a fact about the building is missing.
PlanScope inserts a "[TO BE CONFIRMED]" marker rather than inventing site data, which is the behaviour you want. Those markers are the specification for the site visit. Treat a draft Heritage Statement as a well organised empty frame, and resist the temptation to fill a marker with something plausible. The wider pattern, where drafts get the structure right and the evidence wrong, is covered in what drafts get right about structure and wrong about evidence.
The site visit that cannot be written around
The visit produces things no text can produce. Phasing, read from fabric, joints and changes in brick bond. Condition, including the damp at the base of the chimney breast that explains why the panelling has gone. Surviving plan form, which is often the highest significance in a domestic interior and the first thing an unsympathetic layout destroys. Original joinery, ironmongery, glass and finishes, and whether they are original at all.
Then the things only visible on site: roof structure from the loft hatch, floor construction from a lifted board, the relationship between the house and its boundary wall, and the views that actually exist as opposed to the views a map suggests.
Record it properly. Numbered photographs keyed to a plan, a room by room schedule, and a note of what could not be inspected and why. The last of those is the mark of an honest statement, and officers notice it.
Where the asset warrants formal recording before alteration, that is a separate exercise at the appropriate Historic England level and needs a suitably qualified author.
Using a conservation area appraisal properly
Appraisals are useful and frequently misused. They are area documents, written at a point in time, and they describe character and the contribution of building types rather than assessing your building.
Three cautions. Note the appraisal's date, because a 2009 appraisal may predate changes on the street and may not reflect the current adopted position. Check whether the document was formally adopted, since draft appraisals carry less weight. And do not let an appraisal's general statement that "the uniform roofline contributes to the character of the area" substitute for an assessment of whether your dormer affects it.
Used well, an appraisal gives you the area context and a vocabulary the authority already accepts. Used badly, it produces a statement about a conservation area with nothing in it about a building.
Harm, and why a draft should not pre-judge it
Harm is a conclusion, reached after significance has been established and the proposal has been tested against it. A draft that arrives already stating that the proposal would cause "less than substantial harm" has put the conclusion before the analysis, and it is the single most common defect in a weak heritage statement.
The sequence runs the other way. Identify significance and what contributes to it. Describe the proposal's effect on each contributing element. Characterise the overall effect on significance. Then apply the policy test, and only then address the balance, with the statutory duties properly weighted.
An officer reading a pre-judged conclusion discounts it, and an inspector does worse. Where the honest answer is substantial harm, saying so and making the case on that basis is a better strategy than understating it and losing credibility on everything else.
A checking sequence for a heritage chapter
- Confirm the statutory duties are stated accurately and that section 66 and section 72 have not been conflated.
- Confirm the national policy references match the current edition of the Framework by policy code, not by a paragraph number from an older edition.
- Confirm every list entry quotation is accurate and attributed, with the list entry number and grade.
- Replace every missing-fact marker with an observation from the site visit, or delete the sentence.
- Check that significance is assessed by heritage interest and is specific to the asset.
- Check that harm appears only after the significance analysis, and that the analysis supports it.
- Have the statement reviewed by someone with heritage competence before submission.
That last step is not a formality on a listed building. Heritage work is judgement-led, and a review by a suitably qualified person is the point at which a drafted statement becomes a document you can stand behind. The professional directory is the route to a reviewer who can sign off a draft. If the budget question is what is holding this up, PlanScope's pricing is published.
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. For specialist technical reports, qualified professional input may be required.
Frequently asked questions
What are sections 16, 66 and 72 of the 1990 Act?
Section 16(2) requires special regard to preserving a listed building, its setting and features of special interest when considering listed building consent. Section 66(1) applies the same duty to planning applications affecting a listed building or its setting. Section 72(1) requires special attention to preserving or enhancing the character or appearance of a conservation area.
Can an AI draft assess heritage significance?
No. Significance is the sum of archaeological, architectural, artistic and historic interest in one specific asset, and it is established by inspecting fabric, phasing, plan form and condition. A draft can frame the duties, the policy tests and the method, and it should flag every missing fact rather than filling the gap.
Why do two identical listed houses have different significance?
Because significance lives in what survives. One early nineteenth century terrace may retain its staircase, shutters and rear closet wing while its neighbour was gutted in 1988 and keeps only a facade. The list entries can be near identical while the acceptable interventions are completely different, and only inspection shows which is which.
How should a conservation area appraisal be used?
As area context, not as an assessment of your building. Note its date, since an older appraisal may predate changes on the street, and check whether it was formally adopted, because draft appraisals carry less weight. A general statement about rooflines does not answer whether a particular dormer affects character.
Should a heritage statement state the level of harm at the start?
No. Harm is a conclusion reached after significance has been established and the proposal tested against it. A draft that opens by asserting less than substantial harm has put the conclusion before the analysis, and officers and inspectors discount it. Where the honest answer is substantial harm, say so and argue the case on that basis.
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.