Heritage statement outline for internal alterations

A heritage statement for internal alterations to a listed building succeeds or fails on one thing: whether it assesses the significance of the specific fabric and plan form you intend to change, element by element, before it describes the proposals. A statement that opens with a history of the building and then lists the works, with nothing in between, tells a conservation officer nothing about the harm and will come back with a request for further information.

Listing covers the whole building, inside and out. Section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990 requires consent for works of demolition, alteration or extension in any manner that would affect the character of the building as one of special architectural or historic interest, and removing a lath and plaster partition in a back bedroom can do that.

Why internal works need consent

Three points practitioners still have to explain to clients.

The interior is listed. There is no separate interior designation and no general exemption for internal work. Plan form, joinery, staircases, chimneypieces, plasterwork, floors and historic services can all contribute to special interest.

Carrying out works without consent is a criminal offence under section 9 of the 1990 Act, and ignorance is not a defence. That matters for programming: works cannot start, and a contractor who strips out in advance of consent has created a problem for the owner rather than for themselves.

And there is no application fee for listed building consent, which removes the usual argument for applying for less than you need. A Design and Access Statement is required for a listed building consent application under the procedure order, so the submission is a planning statement, a heritage statement, a design and access statement and the drawings, even for modest internal works.

Section 16 of the 1990 Act then requires the decision maker to have special regard to the desirability of preserving the building and any features of special interest it possesses. That statutory duty is why internal work on a listed building is assessed more strictly than the same work elsewhere.

The asset, its designation and its history

Open the statement with the facts, briefly, and get them right.

State the list entry name, the grade, the date of listing and the list entry number from the National Heritage List for England, and reproduce the relevant part of the list description. Note that the description is for identification and is not a schedule of what matters, because clients and occasionally officers treat an omission from the description as evidence that something lacks interest.

Then set out the building's development: a documentary history from the Historic Environment Record, historic mapping at successive dates, deeds or sale particulars where available, and any earlier recording or consent history. Three or four paragraphs is usually enough, with the detail in an appendix.

Finish this part with a phasing conclusion. Which parts of the fabric date from which phase, and how confident you are. A phase plan, coloured by date, is worth more than two pages of prose and it is the drawing officers look at first.

Significance, room by room

This is the part that does the work, and it is the part most statements skip.

Assess significance against the heritage interests the asset holds: archaeological, architectural and artistic, and historic. National policy asks for a level of detail proportionate to the asset's importance and sufficient to understand the potential impact, which for internal works on a listed building means a room-by-room account rather than a building-wide paragraph.

A workable format is a table with a row per room or space, carrying:

• The room reference, keyed to the existing plan.
• The surviving historic fabric, named specifically: six-panel door with original architrave, moulded cornice, boarded floor, cast grate, lath and plaster ceiling.
• Later alterations, with an approximate date.
• A significance judgement for the space, with a short reason.
• Whether the space contributes to the legibility of the plan form.

That last column matters more than the others on a domestic interior. Plan form, the arrangement and hierarchy of rooms and circulation, is frequently the most important surviving element and the most vulnerable, because removing a spine wall to make an open-plan kitchen does not destroy any individual feature while destroying the way the building is understood.

Be honest about low significance. A 1980s stud partition, a plasterboard ceiling or a modern bathroom fit-out can be removed without harm, and saying so clearly earns credibility for the judgements that matter.

Assessing each intervention

Take the proposals one at a time and assess the effect of each. Do not assess the scheme as a whole, because that is how harm gets lost in a general conclusion.

For each intervention, state what is proposed, what fabric is affected, whether the effect is loss, alteration or concealment, and the resulting level of harm with a reason. Then say whether the harm is substantial or less than substantial in national policy terms, and where the scheme causes no harm, say that and explain why.

Figures and judgements in a table like this are illustrative of the format rather than a template to copy, because the harm judgement depends entirely on the building.

Then set out the justification. Where there is harm, national policy requires clear and convincing justification, and the public benefits have to be identified and weighed. For a private house, benefits are usually about securing the long-term use and viability of the building, which is a real benefit when evidenced and a weak one when asserted. Explain what the alternative is: a building that cannot be used, a repair that cannot be funded, a service installation that has to go somewhere.

Reversibility and recording before works start

Reversibility reduces harm. It does not remove it, and a statement that treats reversible as equivalent to harmless will be corrected.

Set out, for each intervention, whether removed fabric could be reinstated, whether new work is physically separable from historic fabric, and whether fixings are into historic material or into later work. Secondary glazing fixed into a later lining is a different proposition from the same unit screwed through original shutters.

Recording comes before anything is touched. Propose a written and photographic record, at the level appropriate to the significance of what is affected, following the recognised recording levels. For a Grade II house with modest internal changes that may be a photographic survey and annotated plans. For substantial intervention in a Grade II* interior it means a proper analytical record, and Historic Building Recording at Level 3 or 4 is specialist work with a suitably qualified author, for which professional review before submission is strongly advised.

Offer opening-up investigation where the fabric is uncertain, agreed with the conservation officer in advance. This is the single best way to avoid a section 73 application later, and the documents needed if the scheme does have to change are set out in what to submit with a section 73 application.

Mitigation and the method of working

Conservation officers care about how the work is done, and a statement that addresses method gets better conditions.

Cover the things that are routinely got wrong. Lime mortar and lime plaster where the original is lime, with mixes stated. Breathable paints and finishes rather than modern impermeable coatings. Repair rather than replacement of joinery, with new sections spliced in to match profile and species. Retention of historic glass. Removed elements labelled, recorded and stored on site rather than skipped. Services routed in existing chases, voids and later fabric rather than cut through historic plaster. Trial panels for plaster and paint finishes, approved before general application.

Say who will supervise. A named conservation-experienced contractor or a clerk of works is reassuring in a way that a specification clause is not.

The drawings and photographs to include

The statement is only as good as the drawings it refers to.

1. Existing floor plans, sections and elevations at a measured scale, with room references matching the significance table.
2. A phase plan coloured by date of fabric.
3. Proposed plans with demolitions and new work clearly distinguished, and every opening dimensioned.
4. Large-scale details at 1:5 or 1:2 for every junction between new work and historic fabric.
5. A photographic record keyed to a plan, with each photograph numbered and its viewpoint and direction marked.
6. Close-up photographs of each element in the significance table.

Number the photographs and refer to them in the text by number. An officer reading a claim that a cornice is a modern replacement wants to look at it, and a statement that makes them hunt for the image loses the argument by default.

Bring it together in a short conclusion that states the level of harm, the justification and the mitigation, then stop. A Heritage Statement and the accompanying Design and Access Statement are the documents that carry a listed building consent application, and you can see the wider set at all 66 report types. 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's conservation officer or a qualified professional before relying on it, and never start work on a listed building before consent is in place.