Why farm workshop solar makes economic sense around London
London sits within reach of the Lee Valley horticulture sector (around 70% of UK specialist salad crops), Crown Estate Windsor surrounds, and the wider London green belt mixed farming. The region's working farms — many tenanted from institutional landlords like Crown Estate plus Church Commissioners — typically run multi-building holdings with significant on-farm electrical demand. Farm Workshop installations benefit from year-round daytime baseload aligned with PV generation: Welder, compressor, machine-shop loads spike during day — good PV match. What a particular building would save depends on its half-hourly electricity use, the tariff it pays and its export arrangement, so the figures come from the farm’s own bills rather than an area average; the farm solar cost guide shows how to build that estimate from the official DESNZ figures.
Typical farm workshop install specification for London
A representative install for a working farm near London delivers around 20 kW of capacity across roughly 120 square metres of roof area, generates 18k kWh per year, and offsets 4 tonnes of CO2 annually. Class J, Part 14 GPDO permitted development. Workshop electrical certification (BS 7671) coordinated with PV inverter integration. Diesel storage/COMAH-lite considerations for any pipework routing.
Indicative farm workshop install near London
- System size range
- 20–150 kW
- Panel count
- 37–275
- Roof area needed
- 120–900 sqm
- Annual generation
- 18,000–138,000 kWh (modelled)
- Grid DNO
- UK Power Networks
London-area planning and grid context
Farm Workshop solar installations near London typically fall under Class J, Part 14 GPDO 2015 permitted development, with prior approval from the local planning authority for systems over 50 kW. Greater London Authority planning officers handle pre-application consultation efficiently for buildings outside Conservation Areas and AONBs. The distribution network operator (DNO) is the company that owns the local network, set by the site’s location rather than the electricity supplier. It sets its own G99 study timescales and any reinforcement cost, so ask it for current figures in writing before relying on a programme; the process is covered in the guide to DNO grid connection for rural farm solar.
Farm Workshop solar in London — key features
- Welder, compressor, machine-shop loads spike during day — good PV match
- Machinery storage barns often have simple steel-portal frames ideal for retrofit
- Often the lowest-disruption install on a working farm — no livestock biosecurity
- Frequently paired with EV charging for farm fleet electrification
Combined re-roof and PV for older London-area buildings
Many buildings of this age carry asbestos cement sheets. Installers will not normally fix through them, so the roof is overclad or replaced before the panels go on. HSE says most work on asbestos cement is non-licensed provided the people doing it are informed, instructed and trained, and its task sheet A14 asks whether the sheets can be overlaid with non-asbestos material instead of removed. The options and what to ask for are in overclad or strip an asbestos cement farm roof, and the legal position is on solar panels on asbestos cement farm roofs.
What a feasibility study should cover for farm workshop solar in London
A project normally starts with a desk-based feasibility study from half-hourly meter data and building dimensions, which should give an indicative system size, generation forecast and self-consumption ratio before anyone visits. Ask each installer what the study includes, what it costs, who carries it out and what the structural and electrical survey covers. This site is independent guidance, not an installer: send your details through the quote form and we reply by email.
See more detail on our farm workshop page or our wider London farm-building solar coverage.
Nearby cities — farm workshop solar
Nearby cities with a farm workshop solar page:
For the full UK coverage map, see all farm workshop solar installations or browse every location page.
Frequently asked questions
How much does a farm workshop solar install cost in London?
There is no single price for an install of this kind. The official DESNZ series for 2025/26 gives a mean installed cost of £1,266.84 per kW for 10–50 kW systems (£1,167.29 for non-domestic installations in that band), but it covers MCS installations up to 50 kW across all building types, so larger farm systems are priced from written quotes. The farm solar cost guide sets out the series and what moves a farm quote.
How long does a farm workshop install take in London?
The programme depends on the grid connection study, the structural survey and whether the roof needs work first, so ask each installer for a written programme that names those dependencies. No area-wide timescale is published for this page.
What grants are available for London-area farm solar?
No scheme specific to this area is claimed here. The current national position on capital allowances, the Smart Export Guarantee and open schemes is on the grants and funding guide, which is checked against primary sources.
Do I need planning permission for farm workshop solar in London?
Most rooftop installs near London fall under Class J, Part 14 GPDO 2015 permitted development, with prior approval from the local planning authority for systems over 50 kW. Exceptions: listed buildings, AONBs, ground-mount above 9m × 9m × 4m height. Greater London Authority planning officers handle any consultation as part of the project.
Can we install solar on asbestos cement roofs near London?
Not directly: installers will not normally fix through asbestos cement sheets, so the roof is replaced or overclad first. HSE says most work on asbestos cement is non-licensed provided the people doing it are informed, instructed and trained, and its task sheet A14 asks whether the sheets can be overlaid with non-asbestos material instead of removed. The options are set out in the guide to overcladding or stripping an asbestos cement farm roof.
How long does a G99 grid connection take?
The distribution network operator (DNO) is the company that owns the local network, set by the site’s location rather than the electricity supplier. It sets its own G99 study timescales and any reinforcement cost, so ask it for current figures in writing before relying on a programme; the process is covered in the guide to DNO grid connection for rural farm solar.