On-farm incineration and animal by-product disposal
An on-farm incinerator clears three regimes, not one. This covers when planning permission is needed, how animal by-product approval works, the capacity thresholds that bring in a permit, and the alternatives.
Burying or burning fallen stock on the farm is not a lawful disposal route in most of England. Carcasses have to go to an approved destination: a renderer, a knacker, a hunt kennel, an approved collection service, or an incinerator that has been approved for the purpose. Installing your own incinerator means clearing three separate regimes, and planning permission is only one of them.
The animal by-products approval and the environmental permitting position usually take longer than the planning application does, so start them first.
When an incinerator needs planning permission
A fixed incinerator with a flue, a hardstanding and a housing is a building or plant, and installing it is normally development requiring planning permission. A small skid-mounted unit is more arguable, though the flue and the associated hardstanding usually tip it over.
Permitted development under Part 6 of the General Permitted Development Order 2015 is worth checking but rarely resolves the question. Class A permits buildings reasonably necessary for agriculture on holdings of five hectares or more, and authorities take different views on whether disposal of fallen stock is agriculture or waste management. Where the unit will take carcasses from other holdings, the answer is clearly waste management and Part 6 does not apply.
The description of development matters. An application describing "erection of an agricultural building" that turns out to house an incinerator invites an enforcement investigation, and describing it accurately as an incinerator with the capacity stated makes the assessment straightforward.
Set the case out properly in the Planning Statement: the number of animals kept, the typical annual mortality, the distance to the nearest approved alternative, the proposed capacity and the operating pattern.
Approval under the animal by-products regime
Fallen stock are animal by-products and their disposal is controlled under the animal by-products rules enforced by the Animal and Plant Health Agency.
An incinerator used for animal by-products requires approval from that agency before it is used. Approval covers the plant itself, the operating temperature and residence time, the way material is stored before burning, the handling of ash, and the records kept. The approval is site specific and it is not transferable to a different machine.
Burial is prohibited other than in the limited remote areas where a derogation applies, and open burning of carcasses is not a lawful route. Both rules exist because of the disease risk, and both are enforced.
Sheep and cattle carcasses attract additional controls connected with transmissible spongiform encephalopathy surveillance, including sampling requirements for animals in certain age groups. Check the current position before assuming a carcass can go straight into the chamber.
Capacity thresholds and which regulator is involved
Capacity decides which environmental regulator you deal with, and it is the single most useful number to establish early.
| Capacity | Typical regulatory position |
|---|---|
| Low capacity, under 50kg per hour | Animal and plant health approval, no environmental permit in most cases |
| 50kg per hour or more | Environmental permit from the environmental regulator in addition to approval |
| Taking material from other holdings | Treated as a waste operation, permit likely regardless of capacity |
Those thresholds and the exemptions attached to them are revised, so confirm the current requirements with the regulators before you buy a machine. Manufacturers quote throughput in a way that suits their marketing, and the rated capacity that matters is the one the regulator uses.
Where a permit is required, the application covers emissions limits, monitoring, abnormal operation, residue handling and the competence of the operator. That is a substantial exercise and it sits entirely outside the planning system.
Emissions, odour and proximity to dwellings
The planning assessment focuses on effects on neighbours, and three of them come up every time.
Odour is the most commonly raised. Carcass storage before burning is usually a bigger source than the combustion itself, so the application should describe refrigerated or sealed storage, the maximum holding period and the collection or burning frequency. An Odour Assessment using a recognised methodology is proportionate where there are dwellings within a few hundred metres, and councils expect a suitably qualified author.
Emissions to air are the second. A flue discharging at an appropriate height, away from dwellings and clear of building downwash, is the design answer, and a short dispersion note or an Air Quality Assessment supports it where receptors are close or the site lies in an air quality management area.
Visible smoke is the third, and it is regulated separately. Emitting dark smoke from industrial or trade premises is an offence under the clean air legislation, and persistent odour or smoke can be dealt with as a statutory nuisance under the environmental protection legislation regardless of what the planning permission says.
Operating hours are worth offering up front. Daytime operation on weekdays, with a condition, removes most neighbour objections before they are made.
Siting, screening and access for collection
Site the unit within the existing farm building group wherever possible. A new structure standing alone in a field reads as an industrial intrusion and attracts landscape objections, whereas the same structure tucked against an existing range often does not.
Where the holding sits in or near a National Landscape or a National Park, a proportionate landscape appraisal with viewpoint photographs is worth producing, and on a larger installation a Landscape and Visual Impact Assessment may be the right document. The flue height is usually the element that drives the visual assessment, and it is also the element you cannot reduce without harming dispersion.
Access matters for two reasons. Collection vehicles need to reach the ash store and turn without reversing onto a public road. And where the operation involves any movement of carcasses on or off the holding, the route and the frequency should be stated. Our notes on farm tracks and new accesses cover the highway consents that go with any new or altered access.
Hardstanding and drainage complete the picture. An impermeable surface with a sealed drainage arrangement, with no run-off to a watercourse or a field drain, is the expectation, and a soakaway beneath a carcass handling area is not acceptable.
An illustrative example
A 400-ewe sheep holding with an annual mortality typical for the flock, 18 miles from the nearest approved collection point. The application was for a low-capacity incinerator within the existing yard, in a lean-to against an implement shed, with a refrigerated carcass store, an impermeable slab draining to a sealed tank, a flue 1.5m above the ridge, operating hours restricted to 09:00 to 16:00 on weekdays, and a landscape note with four viewpoint photographs. The animal and plant health approval was applied for in parallel. This example is illustrative rather than drawn from a specific case.
Record keeping obligations
The paperwork is continuous rather than one-off, and it is the first thing an inspector asks for.
- A record of each batch incinerated, with the date, the species, the number of animals and the identification where applicable.
- Commercial documents for any material moved to or from the holding.
- Operating records showing the temperature and residence time achieved for each run.
- Maintenance and servicing records for the plant.
- Records of ash disposal, including where it went and under what arrangement.
- Cattle and sheep identification records reconciled against the incineration record.
Keep them for the period the rules require and keep them on site. An approval can be suspended where records are incomplete, and reinstating it takes longer than getting it in the first place.
Alternatives including collection schemes
Before committing capital, price the alternative honestly.
A national collection scheme covering fallen stock exists and operates through approved collectors, with a subscription and a per-collection charge. For most holdings it is the lower-cost and lower-risk route, because it carries no approval, no permit, no planning application and no maintenance liability.
An on-farm incinerator earns its keep where the holding is far from any collection point, where mortality is high enough to justify the capital, where biosecurity considerations make bringing a collection vehicle onto the farm undesirable, or where the holding is large enough to spread the cost.
Shared arrangements between neighbouring holdings look attractive and change the regulatory position, because taking material from another holding generally converts the operation into a waste activity with permitting consequences. Take advice before agreeing to burn a neighbour's stock as a favour.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Can I bury or burn fallen stock on my own land?
Not in most of England. Burial is prohibited other than in limited remote areas where a derogation applies, and open burning of carcasses is not a lawful route. Disposal has to go to an approved destination: a renderer, a knacker, a hunt kennel, an approved collection service, or an incinerator approved for animal by-products.
Does an on-farm incinerator need planning permission?
Usually yes. A fixed unit with a flue, hardstanding and housing is development. Permitted development under Part 6 covers buildings reasonably necessary for agriculture on holdings of five hectares or more, but authorities take differing views on whether carcass disposal is agriculture or waste management, and taking material from other holdings puts it clearly in the second category.
What capacity triggers an environmental permit?
Capacity decides which regulator you deal with. Low-capacity plant, broadly under 50kg per hour, is generally regulated through animal and plant health approval alone. At or above that figure an environmental permit is usually required in addition. Thresholds and exemptions are revised, so confirm the current position with the regulators before buying a machine.
What causes objections from neighbours?
Odour from carcass storage before burning, more often than from the combustion itself, followed by visible smoke and emissions to air. Refrigerated or sealed storage with a stated maximum holding period, a flue at an appropriate height clear of building downwash, and restricted daytime operating hours offered by condition remove most of the objection.
Can I burn a neighbour's fallen stock?
Taking animal by-products from another holding generally converts the operation into a waste activity, which changes the permitting position and may also remove any argument that the building is agricultural for permitted development purposes. Take advice before agreeing to a shared arrangement, because the regulatory consequences are considerably wider than the favour suggests.
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.