Heritage harm refusals and the statutory balance
A heritage appeal turns on significance, the level of harm, the statutory duty and the public benefits, in that order. Here is how the balance is built and where applicants lose it.
A heritage harm appeal balance turns on four questions asked in order: what the asset is, what gives it its significance, how much harm the proposal causes to that significance, and whether the public benefits outweigh the harm once the statutory duty has been applied. Inspectors work through them in that sequence, and a statement of case that jumps to public benefits without settling significance loses the first three before it starts.
The duty is what makes this different from an ordinary planning balance. Sections 16, 66 and 72 of the Planning (Listed Buildings and Conservation Areas) Act 1990 are not optional weighting exercises. The Court of Appeal in Barnwell Manor held that the section 66 duty requires considerable importance and weight to be given to the desirability of preserving a listed building and its setting, which puts a thumb on the scale before the benefits are counted at all.
Identifying the asset and its significance
Get the asset list right and complete. Missing an asset is the error that most often unravels a heritage case, because the authority or an objector finds it and the whole assessment looks careless.
That means the listed building and the curtilage structures, the conservation area, any registered park or garden, any scheduled monument, the non-designated assets on a local list, and the assets whose setting is affected even though they sit some distance away. Setting assessments in particular are where cases are lost. An asset half a kilometre away with an intervisible relationship is in play.
Significance is then described by heritage interest, following the approach in Historic England's Good Practice Advice in Planning 2 and Advice Note 12: architectural, historic, archaeological and artistic interest, with the contribution of setting identified separately. Describe what matters and why, then say which parts of the asset carry that interest and which do not.
A Heritage Statement that describes the building's history without saying what is important about it gives the officer nothing to weigh, and the officer will fill the gap with their own view.
Characterising the level of harm
The Framework distinguishes substantial harm from less than substantial harm, and the consequences differ sharply. Substantial harm to a Grade II asset should be exceptional, and to a Grade I or II* asset or a scheduled monument the Framework sets an even higher bar. Less than substantial harm is weighed against public benefits.
Two habits cause trouble. The first is claiming no harm where a reasonable reader can see some. The second is treating less than substantial as a single category, when the weight given to harm at the top of that range is much greater than at the bottom.
The practical approach is to place the harm on a described scale within less than substantial, explain which elements of significance are affected, and say why the harm falls where you have put it. An inspector may disagree with the label and still accept the reasoning, and a reasoned position that is adjusted slightly survives better than an unreasoned one that is rejected.
Cumulative harm also needs addressing where earlier works have already eroded the asset. Arguing that a further loss matters less because the setting is already compromised sometimes works and sometimes produces a finding that the remaining fabric is therefore more valuable.
The statutory duties and the weight they carry
Three provisions do the work. Section 16 applies to listed building consent, section 66 to planning permission for development affecting a listed building or its setting, and section 72 to the exercise of planning functions in a conservation area, where special attention must be paid to preserving or enhancing character or appearance.
The case law that matters for drafting is short. Barnwell Manor established the considerable importance and weight formulation. Forge Field described the strong presumption against granting permission where harm would be caused, which can be outweighed only by material considerations powerful enough to do so. Mordue confirmed that an authority which properly applies the Framework's heritage policies will generally have discharged the section 66 duty. And Palmer confirmed that mitigation can properly be taken into account in reaching the harm finding itself.
That last point is more useful than it looks. If a design change removes a harmful element, the harm to be weighed is the harm after the change, so revisions made during the application still count.
Public benefits that have been accepted
Public benefits are anything that delivers a public good, and they include heritage benefits to the asset itself. The categories that carry weight in practice:
- Securing the optimum viable use of a building at risk, with evidence of the alternatives tested.
- Repair and long-term maintenance secured by condition or obligation.
- Removal of unsympathetic later additions that detract from significance.
- Improved public access, interpretation or reinstatement of a lost feature.
- Housing delivery, which carries more weight where the authority cannot demonstrate its required supply.
- Economic benefits such as employment floorspace or town centre vitality, evidenced rather than asserted.
- Carbon and energy benefits from reuse rather than replacement, quantified where possible.
Private profit is not a public benefit. Enabling development can be, where the receipts are tied to works to the asset through an obligation and the scale of enabling development is limited to what is needed. That link has to be demonstrated with viability evidence, not assumed.
Illustrative example: conversion of a Grade II former chapel to four flats, with harm from new openings in a side elevation and the loss of internal volume assessed as less than substantial at the lower end. Benefits comprised the repair of a failing roof, the removal of a 1970s lean-to, a maintenance obligation and the reuse of a building vacant for eight years. The circumstances are illustrative and used to show how the balance is constructed.
Evidence that reduces a harm finding
Four kinds of evidence change the harm assessment rather than merely arguing about it.
Archival and fabric research, which can show that an element assumed to be original is a later insertion of little interest. This is where the money is best spent early.
A setting assessment with agreed viewpoints, photomontages from the positions the officer will actually use, and a description of the contribution setting makes to significance. Assertions about visibility lose to photographs.
Recording. A Historic Building Recording to the appropriate Historic England level, where fabric will be lost, mitigates harm in a limited way and is normally expected by condition in any event. Councils usually expect a suitably qualified author and professional review is strongly advised.
Reversibility. Works that can be undone without damage to historic fabric attract a lower harm finding, and secondary glazing, lightweight partitions and services routed in existing voids are the familiar examples.
Where inspectors reject the applicant's label
Patterns recur. A claim of no harm where an original feature is removed. A description of less than substantial harm that turns out, on reading, to involve the loss of the principal historic plan form. A setting assessment that omits the viewpoint from the churchyard. A benefits list that is mostly private gain rebadged.
The other recurring problem is a heritage statement written after the design was fixed. Where the significance assessment plainly postdates the drawings, the inspector can see that the design did not respond to it, and the argument that harm was minimised carries much less force.
Deciding whether the refusal reason is worth challenging is a separate judgement, set out in our note on deciding whether a refusal reason is worth appealing.
Drafting the balance section
Write the balance as a structured passage, not as a paragraph of adjectives. The sequence that reads well:
- State the assets and their significance in two or three sentences each, cross-referring to the heritage statement.
- State the harm, its level, and which elements of significance it affects.
- Apply the statutory duty expressly, naming the section and the considerable importance and weight formulation.
- List the public benefits with the evidence reference for each.
- Conclude on the balance, saying plainly that the harm has been given the weight the duty requires and explaining why the benefits outweigh it.
- Deal with the alternatives that were tested and rejected.
Put that passage in the Planning Statement as well as the heritage statement, because the planning balance is where the decision is made. And write it in language an inspector can adopt, which is the point made in our note on writing a statement of case an inspector can use.
Acknowledge one weakness honestly. Every heritage case has an element the applicant would rather not discuss, and naming it with a reasoned response is better than leaving it for the authority's statement.
This is general guidance, not legal advice, and heritage judgements turn on the specific asset and its setting, so check the position with your local planning authority, the conservation officer and a qualified heritage professional before relying on it. PlanScope drafts a Heritage Statement structured to UK planning policy, with significance and fabric findings flagged for your specialist to complete. Browse all 66 PlanScope report types.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
What does the section 66 duty add to the planning balance?
It requires special regard to the desirability of preserving a listed building, its setting and its features of special interest. The Court of Appeal in Barnwell Manor held that this means considerable importance and weight must be given to that desirability, so harm is weighted before public benefits are counted rather than sitting as one consideration among many.
How do I decide between substantial and less than substantial harm?
Substantial harm involves such serious damage to significance that much of the asset's interest is drained away or vitiated. Most schemes fall within less than substantial harm, which is a wide range rather than a single category. Place the harm on a described scale within that range, say which elements of significance are affected, and explain the reasoning.
Can design changes reduce the harm finding itself?
Yes. The Court of Appeal in Palmer confirmed that mitigation can be taken into account when reaching the harm finding, not only when weighing benefits. So revisions made during the application, such as removing a harmful element or relocating an opening, change the harm that has to be weighed rather than merely offsetting it.
Is enabling development a public benefit?
It can be, where the receipts are tied to works to the heritage asset through a planning obligation and the scale of the enabling development is limited to what is needed to fund them. That link has to be shown with viability evidence. Private profit on its own is not a public benefit, however it is described.
Why do inspectors criticise late heritage statements?
Because the sequence shows in the document. Where the significance assessment plainly postdates the drawings, the design cannot have responded to it, and the argument that harm has been minimised through design carries much less force. Commissioning the significance work before the scheme is fixed is both better practice and better evidence.
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.