Do You Need Planning Permission for an Anaerobic Digestion Plant on a Farm?

Why planning should be considered early

Planning is one of the areas most likely to affect a project's overall timescale, as covered in our guide on how long an AD build takes — and unlike groundworks or equipment procurement, it isn't something a farm can simply start doing faster if it's left too late. Establishing the planning route at the very start of a project, before committing to a specific layout or ordering equipment, avoids the risk of discovering a requirement only once construction is already under way.

Planning permission and permitted development in England

In England, planning permission is generally required for anaerobic digestion developments, though there are permitted development provisions — set out in the Town and Country Planning (General Permitted Development) (England) Order 2015 — that can cover certain agricultural buildings, including some associated with biomass or AD systems, without needing a full planning application. Whether a specific proposal qualifies depends on its scale, siting and other conditions in the order, and industry guidance is consistent that any installation intending to accept third-party waste, rather than only material produced on the farm, is likely to need full planning permission. This is genuinely worth confirming directly with the local planning authority early on, rather than assumed either way.

Scotland: a separate planning system

Scotland has its own planning system, administered by local planning authorities rather than the English framework. Scotland's national planning policy has historically been supportive of renewable and low-carbon developments, including anaerobic digestion, but supportive policy is not the same as an exemption from needing to apply — the specific requirement depends on the development and site. Scottish Government planning advice specific to anaerobic digestion has previously been published and subsequently withdrawn, which is itself a useful reminder that planning guidance changes — the safest approach for a Scottish farm is to check current guidance directly with the relevant local authority rather than rely on older published advice, including anything summarised here.

Never assume an environmental exemption replaces planning permission

An Environment Agency waste exemption such as T24 in England, or an equivalent SEPA authorisation in Scotland, addresses environmental regulation of the AD process and digestate — it does not address, and does not replace, the separate question of planning permission for the physical development itself. A farm can be correctly exempt from environmental permitting and still need planning permission for the same installation.

What planning considerations typically cover

Where planning permission or assessment is needed, it typically considers the plant's scale, the structures and tanks involved, any CHP unit, vehicular access and traffic generated during construction and operation, visual impact on the landscape, noise, odour, proximity to neighbouring properties, and other environmental considerations relevant to the specific site.

• ·Scale of the plant, tanks and any CHP unit
• ·Access and traffic, both during construction and ongoing operation
• ·Visual impact on the surrounding landscape
• ·Noise and odour, particularly where neighbouring properties are nearby
• ·Grid infrastructure, where relevant to the proposal
• ·Listed buildings or other designations affecting the site, where applicable

Why this needs a proper conversation, not a guess

Because the position genuinely depends on the specific development, site and jurisdiction, the right approach is a direct conversation with the relevant local planning authority, and where appropriate a planning professional, before committing to a layout or construction programme. This isn't a step to work around — it's one of the first questions worth answering, alongside the site survey and feasibility assessment covered in our other installation guides.