Vertical farming and controlled environment agriculture

Whether you need vertical farming planning permission turns on one question that most applicants skip: is growing crops indoors, without soil, under lights, "agriculture" in planning terms? If it is, permitted development rights for agricultural units may cover the building and the use needs no separate permission. If it is not, you are proposing a use with no natural home in the Use Classes Order, and the council will treat it as a new use requiring full permission. That distinction decides the whole application.

Whether indoor growing is agriculture in planning terms

Section 336(1) of the Town and Country Planning Act 1990 defines agriculture to include horticulture, fruit growing, seed growing, dairy farming, the breeding and keeping of livestock, the use of land as grazing land, meadow land, osier land, market gardens and nursery grounds. Horticulture and nursery grounds do a lot of work for anyone growing salad leaves, herbs or soft fruit under a roof.

The difficulty is that the statutory language is anchored to the use of land. A stacked growing system in a converted distribution shed uses a building, and the growing medium may be nutrient film or a peat-free substrate rather than the ground beneath it. A glasshouse with crops in the soil is clearly horticulture. A ten-tier hydroponic rack in a steel portal frame unit on an industrial estate is arguably a manufacturing process that happens to produce plants.

Between those two poles sits most of the sector, and there is no settled national guidance drawing the line. That is the honest position, and the safe route is a lawful development certificate under section 192 of the 1990 Act before you commit capital, or a pre-application discussion that puts the authority's view in writing.

Section 55 and the definition of agriculture

Two separate tests run in parallel. Section 55 asks whether there is development at all, through building operations or a material change of use. Section 336 tells you what agriculture means when the answer depends on it.

A new building is almost always operational development, so that question is straightforward. The interesting one is the change of use. Where an existing agricultural holding puts up a growing facility that serves the holding, and the unit is five hectares or more, Part 6 of Schedule 2 to the General Permitted Development Order 2015 may permit the building itself, subject to a ground area limit of 1,000 square metres, height limits, a 25 metre standoff from a metalled trunk or classified road, and a prior approval application for siting, design and external appearance. The building must be reasonably necessary for the purposes of agriculture within that unit.

That last phrase is where controlled environment schemes fail. A facility supplied by lorry with growing media, packaging and inputs from elsewhere, producing for a national retailer, is not obviously necessary for the agriculture of the holding on which it sits. Councils read that test narrowly, and inspectors have followed them. Where the barn already exists, the question of whether Class Q or a full application is the right route is a separate exercise with its own conditions.

Use class consequences if it is not agriculture

Agriculture sits outside the Use Classes Order altogether. If your proposal is held not to be agriculture, it has to land somewhere, and the candidates are Class B2 general industrial, Class B8 storage and distribution where the dominant activity is handling and despatch, or sui generis if it fits neither.

The practical consequences are real. A B2 or B8 use in open countryside faces development plan policies restricting new employment development outside settlement boundaries. It changes the rating position. It changes whether future permitted changes of use are available. And it changes what the highway authority assumes about trip generation, because industrial trip rates look nothing like a farm's.

Describe the development carefully in the application form. "Erection of a horticultural production building for the growing of leafy crops, with ancillary packing" describes something different from "erection of a food production facility", and the description you use will be the description on the decision notice.

Electricity capacity and grid connection

Lighting and climate control make these buildings heavy electricity users. Before design work starts, get a budget estimate from the distribution network operator for the connection, because the answer sometimes moves the site.

Where a new substation, switchgear housing or private cable route is needed, check whether it needs its own permission. Works by an electricity undertaker have their own permitted development rights under Part 15 of the Order, but a compound owned and operated by you is a different matter. On-site generation or battery storage to manage peak tariffs is a separate proposal again, and bolting it onto the application late tends to unravel the noise assessment.

Light spill from glasshouses and growing units

Glasshouse lighting is the issue that generates objections. Supplementary lighting running through winter evenings turns a glasshouse into a lantern visible for miles in a dark rural landscape.

A Lighting Assessment should follow the Institution of Lighting Professionals guidance on obtrusive light, identify the environmental zone for the location, and report sky glow, light intrusion into windows of nearby dwellings and luminaire intensity. In a dark rural zone the limits are tight, and meeting it usually requires automatic blackout screens on the roof and gables, interlocked with the lighting so that they close before the lights come on.

Enclosed vertical farms in solid-walled buildings barely register on light spill, which is a real planning advantage and belongs in the design and access statement. Say it plainly rather than leaving the officer to work it out.

Traffic, packing and distribution activity

Councils accept a farm access serving a few vehicles a day. They look harder at a chilled distribution operation with articulated lorries at four in the morning.

Set out the vehicle profile honestly in a Transport Statement: number and type of movements, arrival and departure times, and where the vehicles go. Where an existing farm track will carry them, the standard of that track and its junction matter, and the point at which a farm track or new access needs permission is not always obvious.

Packing is the activity most likely to tip a use out of agriculture. Packing your own produce is ancillary. Bringing in produce grown elsewhere to pack and despatch is a distribution business, and running one under an agricultural permission is a breach waiting to be enforced.

Conditions councils impose on operation

Expect conditions restricting hours of HGV movement, requiring blackout screening to be installed and operated, capping plant noise at a rating level measured at the nearest dwelling, limiting external lighting to an approved scheme, and tying the use to the description on the decision notice. A well-drafted condition on screening should specify the trigger, not the product.

Ask for conditions you can live with while the application is live. Once imposed, changing them means a section 73 application and another eight weeks.

An illustrative example. A 3,000 square metre glasshouse on an existing 40 hectare holding, growing tomatoes for a regional wholesaler, with a small packhouse serving only its own crop, is a straightforward horticultural proposal needing a full application because the floor area exceeds the Part 6 limit. The same building filled with racking, supplied entirely by imported substrate and lit 18 hours a day, packing produce bought in from two other sites, is a different proposition and should be presented as one.

PlanScope drafts the Planning Statement, Design and Access Statement and supporting technical documents for proposals like these, structured to UK planning policy, with site facts it cannot verify flagged for you to complete. Enter your postcode on PlanScope to see which reports your site is likely to need.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it. A lawful development certificate is the only formal way to confirm that a use or operation is lawful. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.