Extending a listed building is rarely just a design exercise. The planning authority will want to know how the new work relates to the significance of the existing building, whether important historic fabric is affected and whether the extension sits comfortably within the wider setting. A good heritage statement gives that explanation in a practical, evidence-based way and helps the proposal feel considered rather than speculative.
Start with significance, not the new build element
One of the most common mistakes is jumping straight to the extension design without first explaining what is special about the host building.
- Identify the building’s age, development phases, materials and features that contribute most strongly to its significance.
- Consider whether the area proposed for alteration includes earlier masonry, historic openings, service wings or later additions of lesser interest.
- Look beyond the walls themselves and assess courtyards, gardens, approaches and views that help the building’s character be understood.
- Use this significance assessment to decide where an extension may be more acceptable and where it is likely to face stronger resistance.
Show how the design responds to the historic fabric
Planners usually respond best when the heritage statement explains design decisions rather than simply asserting that the scheme is sympathetic.
- Explain scale, massing and roof form in relation to the listed building so the extension reads as secondary, legible and proportionate.
- Describe how new openings, junctions and foundations have been planned to reduce unnecessary loss of historic fabric.
- Set out the approach to materials and detailing, including whether the design is intentionally contemporary, quietly traditional or a hybrid response.
- Clarify whether reversibility, minimal intervention or retention of earlier fabric has influenced the final layout.
Tie the heritage statement to the application set
A strong document should correspond with the drawings. If the text says one thing and the plans show another, delays are almost inevitable.
- Cross-reference key elevations, floor plans and site plans so the officer can move easily between the report and the design package.
- Explain any demolition, opening up or internal alterations in plain language rather than burying them in technical notes.
- Include recent photographs and, where helpful, annotated images that show affected areas before works begin.
- Finish with a balanced conclusion that acknowledges impact but explains why the proposal is appropriate in heritage terms.
Frequently asked questions
Does the heritage statement also cover internal alterations?
It should if the internal works affect significance. Staircases, roof structures, fireplaces, floor levels, partitions and circulation patterns can all be heritage issues in listed buildings.
Should the extension copy the original building exactly?
Not necessarily. Some schemes work best with a quiet traditional palette, while others benefit from a clearly modern but carefully scaled design. The key is whether the response is well justified.
Can a heritage statement support listed building consent as well as planning?
Yes. In many cases it forms part of the supporting information needed for both planning and listed building consent submissions.
Need advice on this type of project?
AS Archaeology & Heritage Services prepares heritage statements for extensions, refurbishments and sensitive change to listed buildings, helping applicants explain significance, impact and design choices clearly.
Related links: Heritage Statement Services | Historic Building Recording | Contact AS Archaeology
