The agricultural building estate is the UK's biggest under-used roof
Across the British countryside sits an enormous, largely south-facing roof estate that does nothing all day: steel portal sheds, grain and crop stores, livestock and poultry buildings, machinery workshops, and traditional and converted barns. An agricultural building is, by design, a large clear span with a simple roof and no shading — which makes it one of the most efficient places in the country to put solar PV. Most farms already have a supply on site and a real daytime load to soak up the generation, so the panels pay for themselves rather than just exporting cheaply. We are barn and agricultural-building solar specialists: we know the planning rights, the roof structures, the asbestos question, and the rural grid — and we size every system to the building's actual load, not its roof area.
Which agricultural buildings suit solar?
Almost all of them, but each type behaves differently. The right system for a 24/7 poultry shed is nothing like the right system for a grain store that only works hard for six weeks a year. We design around the building:
- Steel-frame portal sheds — the modern agricultural standard, and the best canvas for PV: one big unbroken roof, engineered for loading, simple to fix to.
- Grain stores and crop barns — vast roofs, but a seasonal drying peak that needs a battery, export or baseload-sizing decision.
- Livestock and cattle buildings — steady year-round loads from lighting, scrapers, water heating and (in dairy) parlour and cooling plant.
- Poultry and pig units — the strongest economics of all: a huge roof over a near-constant 24/7 ventilation, heating and lighting load.
- Traditional and listed barns — heritage buildings that need a sensitive, consent-led design.
- Barn conversions, smallholdings and stables — domestic and small-business buildings, often paired with a heat pump or EV charger.
For small domestic garden sheds and outbuildings a simpler standalone kit is usually the better answer — see solar panels for sheds. For everything from a working farm shed upwards, an MCS-certified roof-mounted system is what actually moves the electricity bill.
Permitted development on agricultural buildings
This is where a specialist saves you time. Rooftop solar on a working agricultural building is normally permitted development under Class A, Part 14 of the GPDO 2015 — no planning application needed — provided the panels sit no more than 0.2 m above the roof plane and the capacity and siting limits are met. The exceptions are listed buildings, conservation areas, National Parks, AONBs (National Landscapes) and the Broads, where Listed Building Consent or planning permission applies. We confirm exactly where your building stands and handle any application, including the heritage statement, as part of the project.
Structure, asbestos and the roof itself
Two checks come before any panel goes up. First, a short structural appraisal — PV adds roughly 10–15 kg/m² of dead load plus wind uplift, and we confirm the purlins and frame can carry it (modern portal frames almost always can). Second, the asbestos question: many agricultural buildings put up before 2000 have asbestos-cement roofs that cannot be drilled or loaded, and only a licensed contractor may remove them under CAR 2012. The usual fix is a combined strip-and-reclad to profiled steel followed by PV on the new roof — and the solar business case often part-funds a re-roof you needed anyway.
Grid connection in rural areas
Most agricultural-building systems need a G99 application to the regional Distribution Network Operator, and rural networks are frequently capacity-constrained. We submit the G99 alongside the survey to start the clock, and where export is tight we design for self-consumption or add an export limiter and battery — which can turn a many-month connection into a few weeks. A building with a steady on-site load is ideally suited to this approach.
The economics — and the funding that's actually live
Cost per kW falls with size, from around £900–£1,200/kW on a small system to £700–£850/kW above 300 kW — see the full cost guide for the breakdown by building type. On the funding side, be wary of sites promising grants that no longer exist: DEFRA's solar-relevant capital grants (FETF and the Improving Farm Productivity grant) have closed, and there is no currently-open 2026 scheme that funds agricultural-building solar directly. The routes that are live are 100% Annual Investment Allowance (a full first-year tax write-off for working farms), the Smart Export Guarantee for surplus, 0% VAT on residential conversions, and Farming in Protected Landscapes for buildings in designated areas. Our grants and funding guide lays out exactly what applies to your building.
Get a straight answer for your building
Send us a roof photo, your postcode and a recent electricity bill and we'll model the system, confirm the planning route, and tell you the realistic payback — free, with no obligation, and we'll say so if your building doesn't suit solar. Get a free feasibility study for your agricultural building.
