Reports needed for a vertical farm in an industrial unit

The reports for a vertical farm planning application are driven by electricity, water and noise rather than by anything agricultural. A controlled environment growing operation in an industrial unit is, in planning terms, a building full of lighting, fans, chillers and dehumidifiers running around the clock. Treat it as a process plant with plants in it and the evidence base falls into place.

The first question is the one most occupiers get wrong. Growing food indoors on an industrial estate is not automatically agriculture for planning purposes, and assuming otherwise can cost a lease.

Which use class applies

Section 55(2)(e) of the Town and Country Planning Act 1990 takes the use of land for agriculture outside the definition of development, along with the use for that purpose of any building occupied together with land so used. That second limb is the one that fails on an industrial estate, because the unit is not occupied together with agricultural land.

So the starting point is that you are proposing a change of use from whatever the unit lawfully is. The candidates are general industry, storage and distribution, light industry within Class E, or sui generis. Which one applies depends on the nature of the operation: the scale of the plant, whether there is packing and processing, the vehicle movements, and whether the process could be carried on in a residential area without detriment to amenity.

A small research scale facility with modest plant may sit comfortably within light industry. A 10,000 square metre facility with roof mounted chillers, a dedicated substation and night time deliveries will not.

The practical route is to agree the description of development with the case officer before submitting, and to consider a lawful development certificate under section 192 where the existing lawful use might already cover the proposal. Getting this wrong tends to surface at rent review or on sale rather than at planning stage.

Electrical load, energy and heat rejection

Lighting is the dominant load, and it runs for 12 to 18 hours a day across every growing tier. Add the cooling needed to remove the heat that lighting produces and the connection requirement is closer to a data centre than to a warehouse.

Three pieces of work belong at the front of the programme. A capacity enquiry to the distribution network operator, because the answer determines whether the site works at all. A load profile for the facility by phase. And the physical space for any new substation, switchgear and standby generation, which has to be drawn on the site plan rather than added later.

An energy statement should set out the demand, the efficiency measures applied, and how the scheme responds to local policy on carbon reduction. Where the authority applies an energy hierarchy, work through it honestly rather than presenting a photovoltaic array that covers a fraction of the load.

Heat rejection is the visible part. Condensers and chillers usually go on the roof, which raises three separate issues: the visual effect from surrounding viewpoints, the structural capacity of the existing roof, and noise. Deal with all three in the submission.

Noise from fans, chillers and dehumidification

Plant noise is the objection most likely to land, particularly where the estate backs onto housing. Assessment follows BS 4142:2014+A1:2019, comparing the rating level of the plant with the measured background sound level at the nearest noise sensitive receptors.

Continuous operation is what makes this hard. A warehouse next door falls silent at 6pm and the background drops with it, while the growing environment keeps running. The night time case will govern, and mitigation designed around a daytime assessment will not survive.

A noise impact assessment should test the specified plant at the proposed locations, apply corrections for tonality where fans and compressors are involved, and set attenuation that can be procured. Councils usually expect a suitably qualified author and professional review is strongly advised. Acoustic louvres, attenuators and a plant enclosure are all cheaper to design in than to retrofit after a complaint.

Water, nutrient solution and trade effluent

Water demand is significant and continuous. Confirm the mains supply capacity with the water undertaker early, because an upgrade can take months.

The discharge side is the part applicants overlook. Spent nutrient solution contains dissolved fertilisers, and discharging it to the foul sewer requires a trade effluent consent from the sewerage undertaker under the Water Industry Act 1991. That consent will set limits on volume, rate and composition, and meeting them may require treatment plant inside the unit. Where discharge to a watercourse is contemplated instead, an environmental permit is likely to be needed.

Recirculating systems reduce both problems and are worth describing in the planning statement, because they answer the sustainability question and the effluent question at once.

Light spill and the purple glow

Horticultural LED arrays produce a distinctive pink or purple light, and where a unit has rooflights, translucent cladding panels or large glazed elevations that light is visible across an estate at night.

The fixes are straightforward: blackout blinds or opaque internal lining to rooflights, light seals at doors, and a lighting scheme for the external areas designed to the Institution of Lighting Professionals guidance on obtrusive light. A lighting assessment should identify the environmental zone, the nearest residential receptors and the predicted vertical illuminance at their windows.

External security lighting matters too, because a 24 hour operation lights its yard all night. Specify luminaires with proper cut off and a curfew regime.

Vehicles, servicing and the cold chain

Vehicle movements are modest compared with a distribution unit, and they are concentrated. Chilled produce leaves daily, often early, in vans or small rigid vehicles, and growing media, packaging and nutrients arrive on a weekly cycle.

A transport statement should set out movements by vehicle type across a representative day, show the servicing arrangement and refrigerated vehicle standing area, and address staff parking across shifts. Refrigeration units running while parked are a noise source in their own right and should be included in the acoustic assessment rather than treated as traffic.

Employment land policy and the jobs argument

Most industrial estates are covered by an employment land policy that resists the loss of general industrial or storage floorspace. If your proposal is classified as something else, that policy applies to you.

The counter argument is usually employment. Set it out with numbers you can stand behind: jobs by category at full operation, the skills involved, and any local recruitment commitment. An employment land assessment can put that in the context of the authority's own supply figures.

Where the operation stays within an industrial use class the policy point falls away, which is another reason to settle the classification first. For a comparable change of use inside an existing unit, our note on the documents needed for a gym in a former retail unit shows how the same structure applies to a different sector.

You can draft the planning statement, energy, noise, lighting and transport documents for a facility of this kind from the full report index and send the technical ones for professional review. 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.