Manure and straw storage: siting away from neighbours

Site a manure heap or a straw stack more than 400 metres from any dwelling you do not control, at least 10 metres from a watercourse and 50 metres from a spring, well or borehole, and most of the argument disappears. Manure storage planning problems almost always come from the opposite: a heap dropped in the nearest gateway because it was convenient for the loader, upwind of a cottage that was sold off the farm 30 years ago. The storage itself is usually permitted development or not development at all. The complaint, the abatement notice and the objection to the next application all follow from where it sits.

Three regimes bite at once and they do not share a common distance. Planning law sets a 400 metre bar for certain livestock and slurry structures. The water rules set 10 and 50 metre buffers. Statutory nuisance sets no distance whatsoever and instead asks whether the smell is causing a material interference with someone else's enjoyment of their property. A farm that satisfies one can still fall foul of another.

What the permitted development order actually restricts

Part 6 of Schedule 2 to the General Permitted Development Order 2015 gives agricultural units of five hectares or more the right to put up buildings and carry out engineering operations reasonably necessary for agriculture. Class A caps the ground area at 1,000 m², the height at 12 metres, and 3 metres within 3 kilometres of an aerodrome.

The restriction people remember is the 400 metre rule. Class A does not permit a building, structure or excavation for accommodating livestock, or for storing slurry or sewage sludge, within 400 metres of the curtilage of a protected building. A protected building means a permanent building normally occupied by people, and it excludes buildings on the same agricultural unit and buildings on other agricultural units that are used for agriculture.

Read that list again. Slurry and sewage sludge are named. Solid farmyard manure in an open field heap is neither, and an unenclosed heap is generally not a building, structure or excavation at all. So the 400 metre bar usually does not catch the muck heap that generates the complaints. That is the single most common misreading in this area, and it cuts both ways: the farm has more freedom than it thinks, and less protection.

Anything caught by Part 6 Class A that counts as significant development, including the erection of a building or an excavation, needs a prior approval determination from the local planning authority for siting, design and external appearance before work starts. Twenty-eight days, and the authority can require a full application in substance by refusing the siting.

Distances set by the water rules

The Reduction and Prevention of Agricultural Diffuse Pollution (England) Regulations 2018, usually called the farming rules for water, set the buffers that most farms are actually inspected against. Organic manure must not be stored, and must not be applied, within 10 metres of inland freshwater or coastal water, or within 50 metres of a spring, well or borehole. Storage must not be positioned where run-off or leachate is likely to reach water.

Temporary field heaps of solid manure carry their own conditions, and they are tighter inside a nitrate vulnerable zone: a limit on how long a heap may sit in one place, a waiting period before the same spot is used again, and a prohibition on siting heaps on waterlogged, flooded, frozen or steeply sloping ground. The figures are revised, so check the current guidance on gov.uk rather than a note in an old farm file.

Slurry and silage stores are a separate matter. A new or substantially altered store needs written notice to the Environment Agency before it is first used, must stand at least 10 metres from inland or coastal water, and must meet minimum capacity requirements that are longer inside a nitrate vulnerable zone. Those are construction and notification duties, not planning permissions, and a farm can comply with both and still need prior approval under Part 6.

Odour, and why there is no safe distance

No statute gives a separation distance for the smell of farmyard manure. Section 79 of the Environmental Protection Act 1990 makes smell or other effluvia arising on trade or business premises a statutory nuisance where it is prejudicial to health or a nuisance, and agriculture is a business for this purpose. The environmental health officer serves an abatement notice under section 80 if satisfied a nuisance exists. There is a best practicable means defence, which is where the management regime earns its keep.

Turning is the flashpoint. A static heap releases far less than a heap being turned or loaded, and the release is concentrated into the hours when the loader is working. Farms that avoid complaints tend to do three things: keep turning to periods of dispersive wind away from dwellings, cover or consolidate the heap so the surface crusts, and stop scheduling loading for weekend mornings when neighbours are in their gardens.

Where a scheme is large enough for the council to ask for evidence rather than assurances, an Odour Assessment sets out the sources, the receptors, the wind record and the mitigation. That is the same discipline applied to intensive livestock proposals, where scale pushes the question further into screening and odour territory for poultry units.

Straw stacks, fire and the boundary rule

Straw is a fire problem rather than a smell problem, and the rule that catches people is in the Building Regulations rather than in planning. An agricultural building is exempt from most of the Building Regulations only if it meets the conditions in Schedule 2, and two of them are about fire: no part of the building may be less than one and a half times its height from any boundary, and fire exits must be provided within a set distance of any point inside.

Stack a 6 metre high straw store 4 metres from the roadside boundary and the exemption is gone. Approved Document B then applies, including provision for a pumping appliance to reach the building. The fire authority is a consultee the council will listen to on farm access tracks that are too narrow or too soft for an appliance in February.

Open stacks in a field avoid the building question entirely. They still want separation from buildings, from the overhead line, and from the single track the appliance would use.

What the drawings and the conditions should show

Councils grant permission on a site layout, then control the detail by condition. Four things on the layout do most of the work: the storage compound with its distances annotated, the surface water route away from it, the access track and turning area, and the screening that will actually be there in year one rather than year fifteen.

1. Mark the 10 metre and 50 metre water buffers and the 400 metre protected building radius on the plan, even where the 400 metre rule does not apply, so the officer can see it has been considered.
2. Show the fall of the yard and where dirty water goes. A compound draining towards a ditch invites a drainage condition you will struggle to discharge.
3. Position the access so loaders work behind the building line from the nearest dwelling.
4. Give planting a realistic height at planting, and say who maintains it.

A manure and straw management plan, secured by condition, is the usual landing point: storage locations, turning windows, the record of complaints and the response, and a review trigger. Keep it short enough that the farm staff will read it. The supporting text belongs in the Planning Statement, which is also where the relationship to any wider diversification into workshops or offices is explained, because a new commercial use next to a muck heap changes who the sensitive receptors are.

Illustrative example. A 60 hectare mixed farm proposes a covered manure store of 900 m² at the rear of the steading, 180 metres from a cottage sold off the holding in 1994. Because the store is for solid manure and not slurry, the 400 metre bar does not apply, so Class A is available subject to prior approval on siting, design and appearance. The farm moves the store 40 metres north so the existing grain barn sits between it and the cottage, keeps the heap 15 metres from the field ditch, and offers a management plan limiting turning to weekdays. Figures here are illustrative only.

Enter your postcode on PlanScope to see which reports a farm storage scheme is likely to need before you commit to a layout.

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.