Curtilage in Planning Law, Part 3: The Complexities of Curtilage Listing

In this third instalment of our series on the definition of curtilage in planning law, we turn to a closely related and often misunderstood concept – curtilage listing. This legal mechanism extends the protection of listed building status to certain structures or objects associated with a listed building, even where they are not explicitly named in the official list entry.

What Is Curtilage Listing?

Curtilage listing stems from the second limb of the statutory definition of a ‘listed building’ found in section 1(5) of the Planning (Listed Buildings and Conservation Areas) Act 1990. It provides that a listed building includes:

“...any object or structure fixed to the building; and any object or structure within the curtilage of the building which, although not fixed to the building, forms part of the land and has done so since before 1st July 1948.”

In practical terms, this means that certain pre-1948 objects or structures, such as boundary walls, railings, stables, outbuildings, garden follies, gates, and even statues, may fall within the protection of the listing, even if they are not individually identified in the official list entry.

The rationale behind curtilage listing is that certain structures, though not architecturally distinguished in themselves, form part of the ensemble that gives the principal building its character and significance. As the Government’s guidance on listed buildings makes clear, the test is one of association and contribution, not intrinsic merit.

Why Does Curtilage Listing Matter?

Curtilage-listed objects and structures are brought under the control that applies to the main listed building. Carrying out unauthorised works – such as certain repairs, alterations or demolitions – can amount to a criminal offence under section 9 of the 1990 Act.

This means that owners, developers, and contractors must be alert to the possibility that unlisted-looking structures (such as garden walls or gate piers) may nonetheless enjoy full statutory protection.

When Do You Need Consent?

Not all works to curtilage-listed structures will necessarily require listed building consent. The key question is whether the proposed works would affect the character or special interest of the listed building (so defined).

For example:

• Repainting a boundary wall in a historically appropriate colour may not affect the special interest
• Demolishing a pre-1948 garden building or rebuilding historic walls in modern materials almost certainly would

Given the potential for criminal liability, professional advice should always be sought before undertaking works within the curtilage of a listed building.

The Calderdale Framework

In our previous article, we discussed the influential case of Attorney-General ex rel. Sutcliffe v Calderdale Borough Council [1982]. The Court of Appeal developed a three-part test to determine whether a structure falls within the curtilage of a listed building:

1. Physical layout – the spatial and structural relationship between the buildings;
2. Ownership – both historic and at the time of listing; and
3. Use or function – again, both historic and current.

Applying these criteria, the court held that a row of workers’ cottages associated with a listed mill were part of its curtilage. The cottages were physically connected, historically in common ownership, and functionally related to the mill’s operation.

It was observed that curtilage protection may extend to structures “not naturally or certainly regarded as part of the building itself”, if they are so closely related to it that their removal would harm its character or setting.

The Calderdale approach has since served as the foundation for determining curtilage status - though, as subsequent case law illustrates, its application can be complex, particularly in the context of agricultural estates.

A Narrower Approach in Egerton v Taunton Deane BC [2008]

Subsequent decisions have refined, and in some respects narrowed, Calderdale’s reach. In Egerton, the High Court considered whether two agricultural buildings — the “Mill Barn” and “Old Granary” — formed part of the curtilage of the nearby “Jews Farmhouse”, which was listed in 1984.

Although all the buildings were historically under common ownership and part of the same farming enterprise, by the time of listing (1984), the farmhouse had been converted to independent residential use, while the barn and granary continued to function as agricultural buildings. Mr Justice Sullivan found that:

• The functional dependence between the buildings had ceased, and
• A substantial boundary wall created a clear physical and visual division between the domestic and agricultural areas.

He concluded that common ownership and proximity alone were insufficient. What matters is the functional and physical relationship at the time of listing. The barn and granary, therefore, fell outside the curtilage of the farmhouse.

Diverging Judicial Approaches

At first glance, Egerton represents a more restrictive, fact-specific approach than Calderdale. The courts have increasingly emphasised contemporaneous use and physical demarcation at the listing date, rather than broad notions of historical association. Whereas Calderdale emphasised protection for structures integral to a building’s character, Egerton focuses on actual land use and functional separation at the listing date.

This divergence highlights that curtilage determinations are highly fact-sensitive. Two similar properties might yield different outcomes depending on layout, land use, or ownership history. As a result, case-by-case analysis remains essential.

Key Takeaways

Curtilage listing extends statutory protection to pre-1948 structures or objects within the curtilage of a listed building, where those structures or objects contribute to its special interest.

• Curtilage structures or objects may not appear on the official list yet remain protected.
• Consent is required for works to curtilage structures where the works would affect the special interest of the listed building.
• Unauthorised works can lead to enforcement or prosecution
• The curtilage test is fact-specific, typically considering:
  • Historic and current ownership;
  • Functional relationship at the time of listing; and
  • Physical layout and spatial integration
• The Calderdale framework remains the starting point, though cases such as Egerton highlight the importance of contemporaneous land use and physical separation
• When in doubt, specialist heritage or legal advice should always be sought

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