Field shelters: development, caravans or neither
A field shelter may be a building operation, a chattel or something in between. The answer depends on size, permanence and attachment, and on whether horses make the use agricultural.
Whether a field shelter needs planning permission comes down to two separate questions, and people usually answer only the first. The first is whether putting the shelter on the land is development under section 55 of the Town and Country Planning Act 1990, which turns on whether it is a building operation. The second is whether the use of the land is agricultural, because that decides which permitted development rights are available. A field shelter planning permission question answered on mobility alone misses half the analysis.
The pattern is familiar. A landowner buys a timber shelter advertised as mobile, stands it on a corner of a paddock, and hears nothing for three years. Then a complaint arrives, or the land goes up for sale.
Whether a shelter is a building operation
Section 55 defines development to include building operations, and building is defined broadly enough to catch most structures. The courts have settled on three factors: size, permanence and degree of physical attachment. The approach was set out in Skerritts of Nottingham and has been applied to everything from marquees to portable classrooms.
Size matters because a structure too large to be moved by ordinary means looks like a building whatever it rests on. Permanence matters because a structure that stays in one place for years takes on the character of a building. Attachment matters because bolting a frame to a concrete pad removes any argument.
No single factor decides it. A 3.6 metre by 3.6 metre shelter on timber skids, moved between paddocks each season, sitting on grass with no base, has a decent claim to be a chattel. The same shelter on a hardcore pad, with a water pipe run to a trough inside and three years of nettles growing against the back wall, does not.
Mobility, skids and the degree of permanence
Sellers describe shelters as mobile because that is how they are marketed. Councils look at what actually happened on the site.
The evidence that helps is the evidence of movement. Aerial imagery showing the shelter in different positions across successive years, photographs with dates, and a straightforward account of how it is moved and how often. Tow eyes and skids support the case but do not win it on their own.
The evidence that hurts is the base. Concrete, a compacted stone pad with edging, or a levelled and drained platform all suggest a fixed position. And once the shelter is connected to water or electricity, the argument is usually over.
| Feature | Supports chattel | Supports building |
|---|---|---|
| Foundation | Bare grass or timber bearers | Concrete pad or edged hardcore |
| Movement record | Repositioned between seasons | Same position for several years |
| Services | None | Water, power or drainage connected |
| Assembly | Delivered complete on a trailer | Built in place from panels and posts |
| Scale | Single or double bay | Multi-bay block with tack room |
The agricultural use question for horses
Section 336 of the 1990 Act defines agriculture to include the use of land as grazing land. Horses turned out to eat grass are grazing. Horses kept in a paddock, fed hay, exercised and ridden, are being kept rather than grazed, and that is a non-agricultural use of the land.
The distinction sounds academic and decides real cases. If the land use is agricultural, Part 6 of Schedule 2 to the GPDO 2015 may permit a building reasonably necessary for agriculture on a holding of five hectares or more, subject to limits on size, height, siting near a classified road and the prior notification procedure. If the use is equestrian, Part 6 is unavailable and any shelter that is a building needs planning permission.
Livery yards, riding schools and competition venues are clearly non-agricultural. A field where a family's two horses graze most of the year, with a shelter for shade and shelter from the weather, sits closer to the line, and councils differ on it. Ask before you build.
Hardstanding and access serving a shelter
The shelter is rarely the only operation. A stone apron at the entrance to keep the gateway usable, a track from the lane to the field, a manege for schooling and a muck heap are all separate matters.
Laying hardstanding is an engineering operation and can be development in its own right. On agricultural land, Part 6 covers certain excavations and engineering operations reasonably necessary for agriculture, again subject to the holding size and the notification procedure. On equestrian land those rights do not apply. Our note on farm tracks and new accesses covers the access side, including the highway authority's interest in visibility splays.
Manege surfaces attract particular attention because of their size, their drainage and the floodlighting that often follows.
Designated land and the visual issue
In the Green Belt, a building for agriculture or forestry falls within the exceptions to inappropriate development in national policy, while an equestrian shelter does not automatically. That makes the agricultural question decisive rather than academic.
In a National Landscape or National Park, the issue is usually appearance. Dark stained timber, a low profile, a roof that does not glint and a position tucked against an existing hedge or tree group will do more for the application than any amount of policy argument. Where the site is prominent, a short Landscape and Visual Impact Assessment with viewpoint photographs from the nearest public rights of way answers the objection the officer is going to receive anyway.
Colour choice is not a small point. A green or dark brown shelter against a hedge line reads as part of the field. A pale timber one reads as a new object.
Retrospective applications and enforcement
If the shelter is already up, the options are to apply for planning permission retrospectively, to apply for a certificate of lawfulness if the structure is immune from enforcement, or to remove it. Enforcement time limits changed under the Levelling-up and Regeneration Act 2023, so check the current period for operational development rather than relying on the old rule.
A retrospective application is judged on the same policy as a fresh one. The fact that the structure exists carries no weight, though the site photographs at least show the officer exactly what is being considered.
Where the land is being sold or remortgaged, expect the buyer's solicitor to ask. A certificate under section 192 for a proposed shelter, applied for before it is built, costs less trouble than a certificate under section 191 argued after the event. Getting the extending a curtilage in the countryside point right at the same time is worth the effort if the shelter sits near the garden boundary.
A short Planning Statement that sets out the land use, the shelter's construction, the siting and the visual effects gives the case officer the four things they need. You can enter your postcode on PlanScope to see which documents a rural application of this kind usually calls for.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Does a mobile field shelter on skids need planning permission?
It depends on whether it is a building in planning terms. A shelter that really is moved around the field, sits on skids without foundations and is modest in size can be a chattel rather than a building operation. One that has stood on the same spot for years, on a concrete or hardcore base, with services run to it, is almost certainly a building whatever the sales brochure says.
Are horses agricultural for planning purposes?
Only in part. Section 336 defines agriculture to include the use of land as grazing land, so turning horses out to graze pasture is agricultural. Keeping horses for riding, training, livery or competition is not, because the land is used for the animals rather than to produce food or crops. Many equestrian sites involve both, and the dominant use decides the classification.
Can I use agricultural permitted development for a shelter?
Part 6 of Schedule 2 to the GPDO 2015 allows certain buildings reasonably necessary for agriculture on holdings of five hectares or more, subject to size limits, siting restrictions and a prior notification procedure. If the land is used for keeping horses rather than grazing, the rights are not available. Check the holding area and the 25-metre highway restriction before relying on Part 6.
What if the shelter has been there for years without permission?
Time limits for enforcement action against unauthorised operational development have changed under the Levelling-up and Regeneration Act 2023, so verify the current period rather than relying on the old four-year rule. If the shelter is immune, an application under section 191 for a certificate of lawfulness for existing use or development records that formally, which matters on sale.
Does a field shelter count as a caravan?
Rarely. The statutory definition of a caravan covers structures designed or adapted for human habitation that are capable of being moved. A shelter for livestock is not designed for human habitation, so the caravan route does not help. Mobile welfare units and stable blocks with rest rooms occasionally raise the question, and they need separate advice.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.