Getting permission for a vertical farm in an industrial building

Vertical farm planning permission starts with a question the Use Classes Order does not answer cleanly: what use class is growing crops indoors in a shed on an industrial estate. Agriculture escapes the definition of development under section 55(2)(e) of the Town and Country Planning Act 1990, but that exemption covers the use of land for agriculture and the use of buildings occupied together with such land. A standalone unit on an employment estate is not occupied together with agricultural land, so the exemption does not do the work operators hope it will.

What follows is where the arguments land in practice, and what a council will want to see.

How the use gets classified

There is no settled answer, and anyone telling you otherwise is guessing. Depending on the operation, councils have treated controlled environment agriculture as general industrial in Class B2, as storage and distribution in Class B8 where packing and despatch dominate, as light industrial within Class E(g)(iii) where the process can be carried out without detriment to amenity, or as sui generis where it fits none of them.

The character of the operation drives it. A facility that grows, harvests, washes, packs and despatches is doing several things, and the planning unit takes its character from the whole. Processing at scale, refrigeration, waste handling and forty vehicle movements a day pull towards B2 or B8. A small research-scale grow room in an existing light industrial unit may involve no material change of use at all.

Two practical consequences. If the building is already B2 or B8 and your operation fits within that class, you may need no permission for the use, only for the physical works. And if the classification is arguable, a certificate of lawfulness under section 191 or 192 of the 1990 Act is the only formal route to certainty, which matters to a funder committing several million pounds of fit-out.

Power supply, substations and grid capacity

Electrical load is the constraint that kills more of these schemes than planning policy does.

Lighting, climate control and dehumidification give a vertical farm a load profile closer to a data centre than to a warehouse, and estate units are rarely served with the capacity needed. Contact the distribution network operator before anything else, get a budget estimate and a connection date in writing, and treat that date as the critical path.

Where a new or enlarged substation is needed, the planning position depends on who builds it. Works carried out by an electricity undertaker have their own permitted development rights, while a customer-owned substation within your demise is usually part of your own application. Either way, show it on the site plan with its enclosure, access for maintenance and any acoustic treatment.

Standby generation brings its own set of issues: fuel storage, bunding, testing regimes and the noise of a weekly test run. Deal with it in the application rather than adding it later.

Ventilation, chiller noise and plant screening

External plant is the amenity issue, and on an estate bounded by housing it is the one that generates objections.

Chillers, condensers, air handling units and dehumidifiers run continuously, including at night. A Noise Impact Assessment with a measured background level, a rating level for the plant and an attenuation specification is what environmental health will read, and the assessment needs to model the plant as it will actually run rather than at a nominal duty.

Screening helps visually and does very little acoustically unless it is designed as an acoustic barrier. Say which you are proposing. Plant enclosures, attenuators on intakes and discharges, and locating the noisiest equipment away from the sensitive boundary are the measures that work, and they cost far less to design in than to retrofit under an enforcement notice.

Light spill at night

Grow lighting runs on cycles that often peak overnight, when electricity costs less. A building with rooflights and glazed elevations then becomes a lantern visible across the estate and beyond.

The straightforward answer is blackout: opaque panels, internal blinds on a timer, or specifying a building envelope with no rooflights over grow areas. Where glazing is retained, a Lighting Assessment should show the luminance at the boundary and at the nearest sensitive receptors, assessed against the relevant environmental zone, with a control regime the council can condition.

Do not treat this as a minor detail. Sky glow from a horticultural building is one of the few effects that is visible from a distance, and it attracts complaints from people who never noticed the building in daylight.

Water, nutrients and discharge

Recirculating systems use far less water than field agriculture and still need a supply agreement and a discharge route.

Spent nutrient solution is not domestic waste water. Discharging it to the public sewer requires trade effluent consent from the sewerage undertaker under section 118 of the Water Industry Act 1991, with conditions on volume, strength and nutrient content. Discharge to surface water or groundwater is a different regime again and needs an environmental permit.

Get the undertaker's position before you finalise the process design, because a consent limiting nitrogen or phosphorus concentration may require treatment plant that has to fit inside the building. A Utilities Assessment covering power, water, foul drainage and telecoms in one document gives the case officer a single place to look.

Employment land policy

This is the policy risk people underestimate.

Most local plans protect designated employment land, and the protection is usually written by reference to the old B use classes. If your operation is classified as sui generis, a policy that safeguards land for B2 and B8 uses may not obviously permit it, and an officer can end up arguing that a food production facility conflicts with a policy meant to keep out housing.

Answer it with employment evidence. Job numbers, job density per hundred square metres against typical warehouse figures, skill levels, local recruitment and the supply chain served. Where the local plan has an economic strategy referring to food, agri-tech or clean growth sectors, quote it. An Economic Impact Assessment is proportionate on a large facility and unnecessary on a small one.

The technical evidence base

For a facility in an existing building, the usual pack is a Planning Statement dealing with the use class analysis and the employment policy, the noise assessment, the lighting position, the utilities and drainage evidence, a transport statement covering staff and despatch movements, and a waste strategy for growing media and packaging.

Add an energy statement where new build or significant extension is involved, and expect questions about the carbon intensity of the operation. Answering those with a heat recovery and demand management strategy is better than being asked for it at committee.

Sequence the work so the connection date, the trade effluent position and the noise assessment are settled before the application is submitted. Those three determine whether the scheme is deliverable, and the planning application is the easy part by comparison.

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.