solar panels for barns in Devon

Serving Devon and the wider Devon area, including Cornwall, Somerset, Dorset.

Why Devon barn owners are turning roofs into income

Devon is one of England’s great livestock and dairy counties, and that farming character is written into its buildings. From the red-soil dairy ground around Crediton and the Culm Measures, through the sheep and beef country bordering Dartmoor and Exmoor, to the mixed holdings of the South Hams, the Devon farm is defined by its sheds. Cubicle housing for dairy herds, cattle courts, sheep buildings and the big modern steel-portal stores that have gone up over the last two decades all share one thing: a large, simple roof plane sitting idle while the electricity bill climbs.

That roof is the most under-used asset on most Devon farms. A milking parlour runs cooling and vacuum plant through the working day; a livestock building draws steady year-round load for lighting, scrapers and water heating; a grain or forage store has its own seasonal demand. Solar PV turns the roof into a generator that meets that load directly. Because so much of a Devon dairy or livestock unit’s electricity is used in daylight, self-consumption tends to be high — and high self-consumption is what makes a barn array pay. The county’s milder, wetter climate does not change the maths the way people fear: barn solar economics turn far more on how much of your own generation you use than on peak summer irradiance, and a working Devon barn uses a great deal. If you want the headline numbers for your own roof, our cost guide sets out the ranges, and a free quote starts with your real meter data rather than a template.

The barns we work on across Devon

Devon’s building stock spans the full range, and each type is sized and costed differently. The modern standard is the steel-frame portal barn — the clear-span sheds you see on dairy and mixed farms across the county. These are the best canvas for rooftop PV: a single unbroken low-pitch roof, profiled steel sheeting that fixes panels cleanly, and a frame already engineered for wind and snow loading. A working agricultural shed of this kind typically takes a 30–300 kW system, in the region of £24,000–£270,000 depending on roof area, and usually pays back within around five years.

Livestock and cattle barns are everywhere in Devon, and they suit solar well. Dairy units in particular add milk cooling and parlour load to the steady baseload of lighting and scrapers, which lifts self-consumption and shortens payback; these buildings commonly carry 20–200 kW systems. Arable and mixed farms in East Devon and around Honiton run grain and forage stores — our grain stores and crop barns page covers the seasonal-load design decision, because a drying load that peaks for a few autumn weeks needs honest modelling against your daytime baseload rather than over-sizing for the peak.

Then there is Devon’s heritage. The county is rich in traditional stone, cob and slate barns, Dartmoor longhouses, and threshing barns that have stood for centuries. Many have been converted to homes. For these we lead with sensitive listed and traditional barn design, and for converted dwellings, annexes and stables a smaller domestic system feeds the home, its heat pump and EV charger.

Planning and listed barns in Devon

For most working Devon farms, planning is simpler than owners expect. Rooftop PV on an agricultural building is normally Permitted Development under Class A, Part 14 of the GPDO 2015, provided the panels sit no more than 0.2 m above the roof plane and the capacity and siting limits are met. For the typical clear-span shed near Tiverton or Newton Abbot, that means no planning application — just a short structural appraisal to confirm the frame and purlins carry the modest added load.

Devon’s geography adds nuance worth handling honestly. Dartmoor and Exmoor are National Parks, and there are protected landscapes and conservation areas across the county where Permitted Development is restricted or removed and full planning permission may apply. The same is true for the county’s many listed barns, where Listed Building Consent is usually needed. None of this makes solar impossible — it changes the route. We site panels discreetly on a secondary or rear slope, use low-profile in-plane mounting and all-black modules, prepare a heritage statement, and engage the conservation officer early. Where a historic Dartmoor longhouse roof genuinely cannot take PV, a nearby ground-mount array is often the answer. We confirm exactly where your barn sits and handle any application as part of the project.

Grid connection across Devon

Devon’s distribution network operator is National Grid Electricity Distribution (South West) — formerly Western Power Distribution. Rural networks across the county can be capacity-constrained, particularly on the spurs serving farms out towards Dartmoor, the Exmoor fringe and the remoter parts of mid and north Devon. That is a reality to design around, not a dead end.

Almost every barn install sits above 3.68 kW per phase, so a G99 application to the DNO is required. We submit that alongside the structural survey so the connection clock starts immediately. Where export capacity is tight — common on rural feeders — we design for self-consumption, which suits Devon’s high-load dairy and livestock barns naturally, or we add an export limiter and, where the numbers justify it, battery storage. An export-limited or no-export design can turn a connection that would otherwise take many months into one settled in weeks. Because a working Devon barn uses most of what it generates on site, a self-consumption-led design is often both the faster connection and the better return.

What barn solar costs in Devon

Cost follows roof size and use, not farm acreage. A small traditional or converted-barn system of 6–20 kW runs roughly £7,000–£22,000. A working agricultural barn — a steel portal shed or livestock building at 30–200 kW — is typically £24,000–£185,000. The largest Devon roofs, big grain stores or multi-shed units at 200–500 kW, reach £180,000–£450,000. Cost per kW falls as systems grow: around £900–£1,200/kW under 30 kW, £750–£950/kW from 50–250 kW, and £700–£850/kW above 300 kW.

The economics improve further for trading farm businesses. The 100% Annual Investment Allowance lets a Devon farm write off the cost of a working-barn array against tax in year one, and the Smart Export Guarantee pays for surplus exported to the grid — which matters more on lower-load barns that export a larger share. Converted barn homes get the 0% VAT rate on energy-saving materials until 31 March 2027. Our grants and funding page sets out each scheme, and the cost guide gives the full ranges so you can sense-check a figure before you call.

Barn solar across Devon

We work on barns the length and breadth of the county. Around Exeter and the Exe valley, through the dairy ground near Crediton and Tiverton, and east towards Honiton and the Blackdown Hills, we fit PV on steel sheds, livestock buildings and converted barns. In the South Hams and around Newton Abbot and Totnes we cover mixed and dairy holdings; out west towards Tavistock and the Tamar valley, and north to Barnstaple, Bideford and the Torridge country, we serve the livestock and beef farms of the Devon uplands. Wherever your barn stands — a Dartmoor longhouse, a coastal South Hams shed, or a North Devon dairy unit — the approach is the same: pull your meter data, confirm the roof and the DNO position, and design to your real load. Neighbouring Cornwall, Somerset and Dorset farms are covered too.

Ready to see what your Devon barn roof could earn? Start with a free, no-obligation quote and we will model your roof honestly from real figures.