Curtilage buildings and the listing that catches them

The subsection that does the work

Section 1(5) of the 1990 Act 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 it, has formed part of the land since before 1 July 1948.

Read that carefully, because it is doing more than it appears to. It does not say “buildings mentioned in the list entry”. It does not say “buildings of merit”. It attaches protection to things by their position and their age, automatically, and nobody has to make a decision for it to bite. A cart shed nobody has looked at twice since the war carries the same consent requirement as the front elevation of the house.

Why the date is 1 July 1948

It is the day the Town and Country Planning Act 1947 came into force, which is the statute that created the modern listing system. The date has no architectural significance at all. It is a line drawn at the start of the regime, and everything within the curtilage that predates it is swept in.

The practical effect around Oxford is broad, because farmsteads, coach houses and outbuilding ranges are overwhelmingly Victorian or older. A 1960s garage in the same yard is not caught. A stone privy in the corner of the garden almost certainly is.

Note what the date applies to. The structure has to have formed part of the land since before that date, so it is the presence of the building that matters, not when the principal house was listed.

The three factors the courts weigh

Curtilage is not defined in the Act. The leading authority is the Calderdale case in the early 1980s, and the courts have consistently applied three factors to decide whether a building is within the curtilage of another.

• Physical layout. Whether the buildings sit together as a group, share a yard or an enclosure, and read as one holding rather than as separate properties.
• Ownership, past and present. Whether they have historically been in the same ownership, which matters more than the position today.
• Use and function. Whether the smaller building was ancillary to the principal one: serving it, storing for it, housing horses or produce for it.

No single factor decides it. Later cases have confirmed that a curtilage can be substantial rather than small, and that the answer is one of fact and degree in each case. Which is a lawyerly way of saying that a definitive answer sometimes only exists once somebody with authority gives one.

The assessment is made as at the date of listing

This is the point that catches owners who bought a converted outbuilding as a separate property.

The question is whether the building was within the curtilage of the listed building when the listing took effect, not whether it is today. A coach house sold off in the 1990s and now on its own title, with its own access and its own garden, can still be curtilage listed, because in 1974 or whenever the house was listed it stood in the same yard under the same ownership serving the same house.

Subsequent division of the land does not undo the protection. It only makes it harder to spot, because the conveyancing on the smaller property may never mention the listing of a house it is no longer connected to.

The list entry will usually not mention it

List entries are descriptions written for identification, not schedules of protected fabric. Older entries in particular are a paragraph or two of architectural description of the principal building, and they routinely say nothing about outbuildings at all.

An entry’s silence is therefore not evidence of anything. People search the national list, find one line about a farmhouse, see no mention of the barn behind it, and conclude the barn is unprotected. The subsection operates whether or not anybody wrote the barn down.

The reverse is also true and worth knowing. Some entries do describe a range of outbuildings, and some cover a group under a single entry. Where the entry does name something, that settles it and no curtilage argument is needed.

The 2013 provision that allows an entry to exclude things

Since changes made by the Enterprise and Regulatory Reform Act 2013, a list entry can positively state that a specified object or structure attached to, or within the curtilage of, a listed building is not to be treated as part of it.

This was introduced precisely because the automatic sweep of section 1(5) was catching low-interest sheds and later additions and generating consent applications nobody benefited from. It applies where an entry has been made or amended since the provision came in, so it is a feature of recent and revised entries rather than of the older ones.

If the entry for your property is recent, read it for exclusions before assuming the worst. If it is a 1950s or 1970s entry, there will be no exclusions in it and the general rule applies.

The buildings caught most often across Oxfordshire

The pattern is consistent once you have looked at enough of them.

Behind town houses: coach houses and stable blocks, particularly on the north Oxford roads and in Jericho, usually of brick with a shallow slate roof and a hayloft opening at first floor. Wash houses, privies and store ranges attached along a rear boundary.

On farmsteads: threshing barns, cart sheds open on one side, granaries, cattle sheds, dairies, and the linking walls between them. Around Burford, Charlbury, Wantage and Faringdon these are usually stone with heavy stone slate or handmade clay coverings.

And the things people do not think of as buildings at all: garden walls, gate piers, dovecotes, wells, and free-standing garden structures. Rooflights are not relevant to most of those, but they demonstrate how wide the subsection reaches.

What consent a rooflight in one of these needs

If the building is caught, listed building consent is required for works affecting its character as a building of special architectural or historic interest, and cutting a new opening in a roof is such a work by any reading.

Three things follow that people find counterintuitive. Visibility from a public place is irrelevant, because the listing regime is not a visual amenity regime. Internal works are caught too, so opening up a ceiling to bring light down from the new rooflight is part of the same application. And there is no de minimis threshold that lets a small unit through unassessed.

Our page on listed building consent for rooflights covers the application itself in detail. What this page adds is the prior question: whether the building you are working on is inside the designation in the first place.

Planning permission is a separate question with a separate answer

Listing and permitted development are different systems and it is a mistake to reason from one to the other.

Permitted development for rooflights comes from the General Permitted Development Order 2015, Schedule 2, Part 1. Class C covers roof alterations to a dwellinghouse, with the 150mm projection limit and the ridge limit set out on our page about permitted development limits. Class E covers outbuildings within the curtilage of a dwellinghouse, and it has its own height and position conditions rather than a rooflight-specific projection limit.

Where a curtilage building is a domestic outbuilding still serving the house, Class E is the relevant class and the overall height conditions are what a rooflight can put at risk, particularly the 2.5 metre limit within two metres of a boundary. Where the building has been converted to a dwelling in its own right, check the planning permission that allowed the conversion, because those permissions very commonly carry a condition removing Part 1 rights entirely.

None of that touches the consent question. A building can be permitted development for planning purposes and still require listed building consent, and on a curtilage building that is the normal position rather than an unusual one.

How to establish the position without guessing

Four steps, in order, and the whole exercise is a morning’s work.

Search the national list by address and read the full entry, including any exclusions. Look at the map on the entry, which shows the extent of the listing as Historic England understands it, while remembering that curtilage protection can extend beyond what is drawn.

Pull the historic mapping. Ordnance Survey county series sheets for the site, which are widely available through library and archive services, show whether the building existed and how the group was laid out before 1948.

Read the planning history on the authority’s portal. Any previous application on the site will usually have been assessed by a conservation officer, and their consultation response frequently states in terms whether the outbuilding is regarded as curtilage listed.

Then ask the conservation officer directly, naming the address and describing the building. Historic England publishes advice on curtilage that officers work from, and most will give a view in writing.

The certificate that settles it formally

Since 2013 there has been a formal route for the specific question of whether proposed works to a listed building need consent at all. An application can be made to the local planning authority for a certificate stating that the works described would not affect the character of the building as one of special interest, and therefore that listed building consent is not required.

It is the listed building equivalent of the certificate of lawfulness used on the planning side, and like that certificate it is a determination of law rather than a grant of anything. It is worth considering where the curtilage question is genuinely arguable and where a future sale is in prospect.

Be realistic about the outcome. For a new opening in a historic roof the honest expectation is that the authority will say consent is required, because a new opening usually does affect character. The certificate route is more useful for like-for-like replacement of an existing rooflight in an existing opening.

What officers tend to accept in former farm buildings

Conservation officers approach agricultural and ancillary buildings with a consistent set of concerns, and knowing them shapes a proposal before it is drawn.

The building should continue to read as what it was. A threshing barn with a regular grid of domestic-scale rooflights across the main elevation stops reading as a barn, and that, rather than the loss of any particular slate, is usually the objection.

Numbers and rhythm matter more than individual size. Units grouped in relation to existing openings, bays or truss positions sit better than units spread evenly to suit the rooms below. Rear and courtyard-facing slopes are easier than slopes seen on the approach.

Flush profile is close to a requirement rather than a preference. On a stone slate or handmade clay covering, a unit standing proud of the plane throws a shadow line along its head that is legible from a long way off, which is exactly the effect an officer is trying to avoid.

The roof structures you actually meet in these buildings

The construction is the reason curtilage buildings are technically harder than houses, and it is worth understanding before a position is chosen.

Barn and cart shed roofs are commonly principal rafter and purlin structures with common rafters at close spacing, often with no ridge board and no sarking. Coach house roofs are frequently lighter than they look, with rafters sized for a slate covering and nothing else. Loadings run through specific members, and cutting one without a proper trimmer transfers load in ways the building was never built to take.

The covering compounds it. Stone slates are laid in diminishing courses on riven laths, they are heavy, they are individually irreplaceable, and forming an opening means lifting and re-dressing a surrounding area rather than removing a neat rectangle. Handmade clay peg tiles behave similarly with less weight.

Where a later softwood roof has replaced the original, the technical constraint eases and so, usually, does the heritage argument, because the fabric being altered is not historic. Establishing which of the two you have is a survey question, and it is frequently the fact that decides the application.

Positions that avoid the fabric that matters

A proposal that works usually works because of where it sits, not because of what unit was chosen.

Between principal members rather than through them, so no truss, principal rafter or through purlin is cut. In a later addition, a lean-to or an outshut rather than in the original range. On a slope already altered by a previous re-covering. Or in a position where an earlier opening, a hayloft door or a blocked vent, already interrupts the fabric.

Where none of those exist and the only workable position runs through a principal member, the honest answer is often that the proposal should not proceed in that form. Saying so early costs a conversation. Finding it out after a refusal costs a cycle of months.

Where our work fits on a curtilage building

Heritage Skylights installs and replaces rooflights. We do not submit applications, we do not act as your agent with the council, and we do not offer a view on whether a particular building is curtilage listed, because that is a question of law for the authority and, ultimately, for a court.

What we supply is the technical evidence the application needs and applicants most often lack. A survey of the actual roof structure, member by member, saying what is original and what is later. The covering identified and assessed for whether it can be lifted and reinstated. A unit specified in full, with its projection above the plane of the covering in millimetres. And the perimeter detail: upstand height, flashing laps, and where the covering terminates around the opening, which is the part that decides whether the installation stays dry for twenty years and is why the workmanship carries a ten-year guarantee.

Your architect or heritage consultant takes that and builds the case. We take the drawings that come back with consent on them and fit what was approved, on the slope it was approved on, in the position it was approved in. The roof is never left open overnight, which on an unheated stone building with no sarking matters more than it does on a modern house.