When buying or altering a listed property, looking only at the main building can leave an important question unanswered: are nearby structures treated as part of the listed building because they fall within its curtilage?
Historic England’s Advice Note 10 explains that certain buildings and structures dating from before July 1948 within a listed building’s curtilage are treated as part of it. Assessing the extent can be difficult. Its guidance uses hypothetical examples and discusses the legislative and case-law background rather than offering a universal boundary rule for every property.
A property-specific assessment
Historic England says the local planning authority reaches a conclusion about whether a building is within a particular curtilage, with a disputed unreasonable decision ultimately a matter for the court. A short online definition should therefore not be used to settle the status of a particular outbuilding.
For an owner considering work, identify the actual structure and proposed changes before seeking advice. Gather the available history, plans and photographs, and explain how the structure relates to the main building. Ask an appropriately experienced adviser and the council’s conservation team what information they need to assess the position.
Do not rely on a single drawing
A current plan or modern fence may help describe the site, but it should not be treated as the complete answer to a historic curtilage question. Keep questions about ownership, the extent of listing and the consent needed for proposed work clear in communications with advisers.
Ask for the reasoning behind an assessment and retain it with the property records. If the proposed work changes, check whether the earlier advice still applies rather than assuming it covers a different design or structure.
Check before work begins
Altering or demolishing a protected curtilage structure may require listed building consent. Historic England warns that carrying out work without consent when it is needed is a criminal offence. Resolving the issue before commissioning work is therefore important to the project’s planning.
For buyers, raise unresolved questions during the purchase process and ask the legal adviser what further investigation is appropriate. A seller’s description or an attractive photograph cannot determine the consent position.
Source: Historic England, Listed Buildings and Curtilage, Advice Note 10, revised June 2025 and checked 4 November 2026. This guide does not determine the legal status of any individual structure.