What suitably qualified means for a heritage statement

No law says a heritage statement must be written by an accredited conservation specialist. What national policy requires is that the applicant describes the significance of any heritage asset affected, in enough detail to understand the impact of the proposal, and proportionate to the importance of the asset. For a modest rear extension to a Grade II house, a careful homeowner can meet that test. For alterations to a Grade I building or a scheme causing more than minor harm, they cannot, and the council will say so.

The word doing the work is proportionate.

What national guidance expects

The requirement sits in the National Planning Policy Framework, which asks applicants to describe the significance of the asset and any contribution made by its setting, using appropriate expertise where necessary. The Planning Practice Guidance on the historic environment expands on it, and Historic England's advice note on statements of heritage significance sets out the structure councils recognise: what the asset is, why it matters, how the proposal affects that, and how the effect has been reduced.

Two things follow from the word appropriate. A statement for a small change to a locally listed building does not need an accredited author. A statement supporting substantial harm to a designated asset needs someone whose judgement the authority and, later, an inspector will accept.

The other half of the test is the validation list. Some authorities require a heritage statement for any application affecting a listed building or a conservation area, some set a threshold, and a few specify that it must be prepared by a suitably qualified person. Read the list before you decide who writes it.

Accreditation and membership routes

Several routes signal conservation competence, and they are not interchangeable.

• The Institute of Historic Building Conservation is the professional body for building conservation practitioners, and full membership indicates assessed conservation competence across disciplines.
• The Chartered Institute for Archaeologists accredits archaeologists, which matters for below-ground archaeology and for buildings archaeology rather than for general heritage statements.
• The Royal Town Planning Institute charters planners, some of whom specialise in heritage, though chartership itself says nothing about conservation expertise.
• Historic environment consultancies often hold registered practice status with one of the institutes, which tells you about the practice rather than the individual writing your report.

Ask who will write the statement and what their assessed conservation qualification is. The answer "we do lots of listed buildings" is not an answer.

Architect and surveyor conservation accreditation

For work led by a designer, the accreditation schemes are worth understanding because they are frequently a condition of grant funding and sometimes of insurance.

The Royal Institute of British Architects operates a conservation register with tiers reflecting depth of experience, and there is a separate register of architects accredited in building conservation. The Royal Institution of Chartered Surveyors runs building conservation accreditation for surveyors. Each involves assessment of completed conservation work rather than an examination alone.

Where the building is Grade I or Grade II*, where the works are structural, or where a repair scheme touches historic fabric directly, an accredited designer changes the conversation with the conservation officer. Where the proposal is a single-storey extension well away from the principal elevation, it adds cost without changing the outcome.

Where a homeowner can write their own

Plenty of statements are written by owners, and the good ones share the same features. They read the list entry, then look beyond it, because the entry describes what was noted at listing rather than everything that matters. They use the county historic environment record, historic maps and old photographs. They describe the building room by room where internal work is proposed. And they are honest about harm.

A workable structure for a householder statement:

1. What the building is: date, materials, plan form, grade and the list entry reference.
2. What gives it significance: architectural, historic, artistic and archaeological interest, each in its own short paragraph.
3. What the proposal does, described against those interests rather than in construction terms.
4. What harm arises, stated plainly, and what has been changed in the design to reduce it.
5. Any public benefit, if the proposal delivers one.

Where that runs to three or four pages with photographs, it is usually enough for a simple scheme. A first draft can be produced quickly and structured to UK planning policy, then checked by whoever knows the building, and PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.

Proportionality to the asset

The sliding scale is easier to see set out.

The grade is not the only factor. A rare survival, a building with an unusual plan form, or a case where the setting of a highly graded asset is affected can all push a modest proposal up the scale. So can a council with an active conservation team and a history of taking such cases to committee.

Conservation officer expectations

Conservation officers read dozens of these. What earns their trust is not length. It is evidence that the author looked at the building, understood what was significant about it, and let that understanding change the design.

What loses trust: a statement that recites the list entry and adds nothing, a significance section written as praise rather than analysis, a harm assessment that concludes no harm when harm is obvious, and a document clearly assembled from a template with the address changed. Where a scheme causes harm and the statement denies it, the officer stops reading and writes the refusal reason from the drawings.

Ask the conservation officer what they want to see before commissioning. Many will say, and it is free.

Commissioning at the right stage

The common mistake is ordering the statement after the drawings are finished, as a validation document. By then the design decisions that caused the harm are fixed, and the consultant is being asked to justify rather than advise.

Bring the heritage adviser in at the sketch stage, alongside the measured survey. The fee is similar and the advice actually shapes the scheme: where the opening can go, which staircase cannot move, whether the roof can take a dormer at all. That is also the point at which you find out whether the project needs an archaeological assessment or a written record of the fabric, both of which have programme implications.

Where the statement is one of several specialist documents, the same questions about credentials arise each time. The approach set out for choosing an arboriculturist and reading credentials transfers directly, as does the practice of briefing a specialist when the site data is incomplete.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required. If you want a draft reviewed and signed off, the professional directory is the route to a reviewer.