Reports for a vertical farm in a warehouse

A controlled environment vertical farm in an existing warehouse is almost always a change of use needing planning permission, and the use class it lands in is not settled. The vertical farm planning reports that decide these applications are the Energy Statement, because the electrical load is large enough to need a grid conversation, and a lighting assessment, because grow lights spill a distinctive pink light through every rooflight and open shutter door. Noise from chillers and air handling plant comes third, and the water and effluent position fourth.

Treat the use class question as the first piece of work rather than an afterthought. It determines whether you need an application at all, and if you do, it determines the fee and the comparison the officer draws.

Which use class indoor growing falls into

Agriculture is defined in section 336 of the Town and Country Planning Act 1990 and includes horticulture. That definition is framed around the use of land, which is the source of the difficulty: a hydroponic farm in a steel-framed shed is not using the land for horticulture in any ordinary sense.

In practice, authorities have reached different conclusions. A plant growing crops with no processing has been treated as sui generis in some cases. Where packing, washing and preparation dominate the floor area, light industrial use within Class E(g)(iii) or general industrial use in Class B2 become the natural comparisons, and where the operation is largely storage and despatch, Class B8 is argued.

That matters because the starting point is usually a building in Class B8. A move from B8 to B2 needs permission. A move from B8 to E(g)(iii) needs permission unless a permitted development right applies. And if the use is sui generis, permission is certainly needed.

There is no settled national position, and anyone who tells you otherwise is guessing. The practical answer is to seek a pre-application view in writing, and where the investment justifies it, to apply for a lawful development certificate under section 192 of the 1990 Act so the position is documented for a funder.

Energy demand, grid capacity and the energy statement

This is the constraint that kills schemes. A multi-tier growing facility runs LED arrays for 16 to 18 hours a day across every tier, plus dehumidification, chilling and air handling to hold temperature and humidity. The connected load for a single warehouse unit can exceed what the whole industrial estate was designed around.

Start with the distribution network operator. Request a connection offer early, because the quotation process runs to its own timetable and any reinforcement works may need separate consents and separate land rights. A scheme designed on an assumed capacity that does not exist is a scheme that cannot be built.

For the application itself, the Energy Statement should set out the connected load, the demand profile across the day, the proposed efficiency measures, any on-site generation and storage, and the confirmed or indicative connection position. In London, the energy hierarchy in the London Plan applies and the statement has to be structured to it. Elsewhere, the local plan energy policy sets the requirement.

Record the existing capacity and the reinforcement position in a Utilities Assessment, including the water and foul drainage position, because they are usually the same conversation with the same statutory undertakers.

Light spill from grow lights through roof and openings

LED horticultural lighting is intense and its spectrum is unmistakable. A warehouse with translucent roof panels running grow lights overnight reads from a distance as a glowing pink box, and that is an amenity and landscape effect an officer can describe without any technical evidence at all.

The mitigation is architectural rather than operational. Replace or overlay translucent roof panels with opaque sheeting in the growing areas. Fit light-tight louvres or vestibules to personnel doors used at night. Use roller shutter interlocks so a door cannot be opened while the growing area is lit, or provide an airlock. Blackout blinds on any glazing. Each of these is easier to design in than to retrofit after a condition requires it.

A Lighting Assessment prepared to the Institution of Lighting Professionals guidance on obtrusive light gives the officer the environmental zone, the vertical illuminance at nearby windows and the sky glow position. Industrial estates usually fall into a less sensitive environmental zone, which helps, and a site with housing on one boundary does not.

External lighting for the yard and car park is a separate matter and should be assessed in the same document, with full cut-off luminaires and a controls regime.

Plant noise from chillers and ventilation

The plant runs continuously, which is the difference between this and most industrial uses. A chiller and air handling units on a flat roof, operating at 3am to hold a growing temperature, is a classic cause of complaint where housing is within a few hundred metres.

Assessment follows BS 4142:2014+A1:2019, comparing the rating level with the measured background sound level at the nearest sensitive receptor, with character corrections where the plant is tonal. Night-time background levels on an industrial estate adjoining housing are often lower than people expect, which is why measuring rather than assuming matters. A Noise Impact Assessment should also address the cumulative position with existing plant on the estate.

Mitigation that works: acoustic screening around roof plant, attenuators on intake and discharge, anti-vibration mounts, variable speed drives so the plant is not running at full output through the night, and locating plant on the elevation away from receptors. Expect a condition fixing a rating level at the nearest receptor boundary, which is a condition worth accepting because it is measurable.

Water use, nutrient solution and trade effluent

Recirculating systems use far less water than field growing and they still need a reliable supply and a route for discharge. Three things need answering in the application.

The incoming supply, including any reverse osmosis pre-treatment and the volume required, confirmed with the water undertaker. Reverse osmosis produces a reject stream that has to go somewhere.

The discharge. Spent nutrient solution contains nitrogen and phosphorus and is not ordinary domestic effluent. Discharge to the public sewer needs the consent of the sewerage undertaker under the trade effluent provisions of the Water Industry Act 1991, and the undertaker sets the conditions and charges. Discharge to a watercourse or to ground would need an environmental permit instead, which is a much harder route.

Surface water, where any yard or hardstanding is altered. Where the scheme is confined to the inside of an existing building, the drainage position may be unchanged, and the application should say so rather than leaving the officer to wonder.

Deliveries, packing and distribution movements

Vertical farms harvest continuously rather than seasonally, so the movement profile is steady and includes chilled despatch vehicles. Set out the daily movements by vehicle type and time, separating inbound consumables, growing media and packaging from outbound produce.

Where the estate access is shared, the highway authority will want to know whether the profile differs from the previous B8 use. Often it does not materially, and saying so with numbers is more persuasive than saying so in prose. A transport statement is usually proportionate unless the floorspace or trip generation crosses the local threshold, and the cost structure of transport evidence works the same way here as on any industrial scheme, as set out for an industrial extension inside an AQMA.

Staff travel deserves attention because the shift pattern is unusual. Growing facilities often run early and late shifts, and public transport to an industrial estate at 6am is frequently non-existent.

Odour and waste from growing media

Odour is a smaller issue than people expect from a facility growing leafy crops, and it is not zero. The sources are the spent growing media store, any composting or maceration of plant waste, and occasionally the nutrient tanks.

Spent rockwool, coir or peat-free media leaves the site as waste in volume. A Waste Management Strategy should set out the streams, the storage volumes and the collection frequency, and show the store on the plans with a collection point that works for the vehicle.

Expect conditions on plant noise, external lighting and light spill from the building, hours of despatch, waste storage, and the retention of any opaque roofing or light-tight detailing that the lighting case relied on. Read that last one carefully: a condition requiring the building to remain light-tight is easy to breach accidentally when a maintenance contractor replaces a damaged roof panel.

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. For specialist technical reports, qualified professional input may be required.