Class S: an agricultural building as a school or nursery

Class S of Schedule 2 Part 3 to the General Permitted Development Order 2015 allows an agricultural building to change use to a state-funded school or a registered nursery, subject to prior approval. The two words that decide whether the route is available to you are "state-funded". A private prep school cannot use Class S. A free school or academy with a funding agreement can, and so can a nursery registered with Ofsted, which is why almost all real Class S cases are nurseries rather than schools.

What the class permits and for whom

The permitted development is a change of use of an agricultural building, and any land within its curtilage, to use as a state-funded school or a registered nursery. Limited building operations reasonably necessary to convert the building are permitted alongside the change of use.

A state-funded school for these purposes is one funded wholly or mainly from public funds, which takes in maintained schools, academies and free schools. A registered nursery means a childcare provider registered under the childcare legislation, in practice with Ofsted.

The building has to have been in agricultural use as part of an established agricultural unit, and the Order sets a qualifying date for that use. Read the current text before you rely on a date, because Part 3 has been amended repeatedly since 2015.

The floorspace and site limits

Class S caps the cumulative floor space of the building or buildings changing use at 500 square metres. That is the number that shapes everything else.

Five hundred square metres is a generous single-form nursery and a very small school. Put another way, it gets you perhaps four or five classroom-sized spaces plus circulation, lavatories and a kitchen once you allow for the structure of a typical portal-frame barn. Schemes above the cap need a full planning application for the excess, and you cannot split a scheme across two Class S notifications to get round it.

Other exclusions bite in the usual places: listed buildings, scheduled monuments, sites of special scientific interest, safety hazard areas and military explosives storage areas. Restrictions also apply where the building is held under an agricultural tenancy without the necessary consents. Check the class conditions in full rather than assuming your site qualifies.

Prior approval and what the council can consider

Prior approval is not a light-touch rubber stamp, and on a rural site it is where most Class S proposals get difficult. The matters for the authority to consider are transport and highways impacts, noise impacts, contamination risks and flooding risks, together with whether the location or siting of the building makes the change of use impractical or undesirable.

That last matter is unusually wide for a prior approval, and it is the one a parish council will press. A barn at the end of a single-track lane with no footway, 1.5 kilometres from the village, is a building whose siting can properly be called undesirable for a nursery.

The procedure follows the Part 3 pattern. You apply to the local planning authority with a written description of the development, a site plan, contact details and the fee, the authority consults, and it has 56 days from a valid application to give or refuse prior approval or to notify you that prior approval is not required. Miss the deadline and the development may proceed, which is why authorities are careful about validation.

The evidence that answers each matter

Transport is the heaviest of the four on a rural site. Expect to need visibility splays at the access measured against the recorded speeds on the lane, a drop-off and pick-up strategy that keeps vehicles off the carriageway, a turning area for the largest expected vehicle, staff and visitor parking, and a trip generation estimate for the twice-daily peak. A Transport Statement is usually the right scale of document for a nursery; larger proposals move towards a full assessment.

Noise cuts both ways. The authority will look at noise from the use, principally children in outdoor play and vehicles at drop-off, affecting nearby dwellings. It will also look at noise reaching the site, because a nursery beside a grain drier or a poultry unit has an internal environment problem. A Noise Impact Assessment should address both directions, and councils usually expect a suitably qualified author.

Contamination is routine on farmsteads and it is regularly underestimated. Fuel tanks, sheep dip, asbestos cement sheeting, pesticide stores and buried farm waste are all common, and a nursery is one of the most sensitive end uses there is. A desk study will identify whether intrusive work is needed, and land contamination reports must be prepared by suitably qualified and experienced persons in accordance with BS 10175. PlanScope drafts are a starting point for that professional, never a substitute.

Flood risk follows the ordinary approach: check the flood map for planning, and if the site is in Flood Zone 2 or 3, produce a Flood Risk Assessment that deals with the vulnerability of the use. Schools and nurseries are a more vulnerable use class in flood risk terms, which matters a great deal in Zone 3.

Playing space and outdoor provision

Class S changes the use of the building and the land within its curtilage. It does not give you a playing field in the next parcel, and it does not authorise the engineering operations that turn a yard into a safe outdoor play area.

Childcare registration requirements set expectations for indoor and outdoor space per child, and those are regulatory requirements sitting outside planning. The planning consequence is that a building which just fits the 500 square metre cap may still fail because there is nowhere acceptable for the children to go outside.

Hard surfacing, fencing, boundary treatment, external lighting and a canopy may each need separate permission depending on scale and location. Deal with them in the same programme rather than discovering them after the prior approval is granted. The prior approval routes in Part 7 work the same way, and our note on extending an industrial building or warehouse under Part 7 Class H shows the same procedural shape applied to a different class.

Reverting or changing again afterwards

Once the change of use has taken place, the building is in educational use and the agricultural permitted development rights that attached to it have gone. Part 6 rights depend on the building being part of an agricultural unit used for agriculture, and a nursery is not that.

Going back to agricultural use later would be a further material change of use requiring planning permission, and the council would assess it on its merits with the nursery as the lawful use. Treat Class S as a one-way door.

There is also a practical point about funding. A free school that never opens, or a nursery that never registers, leaves a building with a lawful use it cannot exercise and no easy way back.

Why the route is used so rarely

Three constraints compound. The state-funded requirement rules out independent education entirely. The 500 square metre cap rules out most school-sized proposals. And the rural siting of agricultural buildings is exactly what makes the transport and undesirability tests hard to pass.

What is left is a narrow but real case: a redundant modern barn on the edge of a village, on a lane with a footway, taken by a nursery operator who can evidence demand and manage drop-off. Those schemes do get approved.

For anything else, a full planning application is usually the faster route, because it lets you argue the merits, offer conditions, and bring the outdoor space and the access works into a single consent. A Planning Statement that addresses rural services policy directly is often a better investment than a prior approval that fails on one of five matters.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

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