Which agricultural buildings work best for solar?
Almost every type of UK farm building can host solar PV. The differences are about roof area, structural age, internal load profile, and orientation. We routinely install on all eight categories below:
Dutch barns & general-purpose buildings
Open-sided dutch barns and 1970s-1990s portal-frame general-purpose sheds dominate UK farm building stock. Roof typically 250–800 m². Often have asbestos cement roofing (check before quote). Ideal for 40–130 kWp installations.
Dairy parlours & cubicle housing
Modern parlour buildings have large unbroken roof spans (300–1,500 m²) and high baseload electricity demand from bulk tank cooling, vacuum pumps and milking equipment. Self-consumption rates 75-85%. 30–250 kWp typical.
Poultry sheds (broiler & layer)
Insulated composite-panel construction with very large clear roof spans (600–2,500 m² per shed). Continuous ventilation = 24/7 demand. Fastest UK farm solar paybacks — often under 2 years. 80–300 kWp per shed.
Grain stores & drying plant
Large clear-span steel-portal structures (1,000–4,000 m²). Peak energy demand August-October during harvest — aligns perfectly with peak solar generation. 100–500 kWp common.
Pig units & finishing houses
Intensive units have continuous climate control, automated feeding and waste handling. Very high baseload. Ammonia exposure requires specialist coatings. 60–200 kWp typical.
Packhouses & pre-cooling rooms
Modern soft-fruit packhouses run pre-cooling, grading lines and cold storage 24/7 during harvest. Tesco / Sainsbury's Scope 3 reporting drives demand. 100–500 kWp standard.
Glasshouses & protected cropping
Glasshouse roofs can't typically host solar PV directly but adjacent ground-mount or canopy structures deliver 500 kWp – 1 MW per site. Substantial supplementary lighting + CO2 + climate control demand.
Equestrian centres & smallholdings
Indoor schools, stable blocks and lameness clinics make good solar hosts. Visitor traffic justifies EV charger pairing. Typically 15–50 kWp systems with battery for evening events.
Sizing solar for your farm building
Three numbers determine system size: roof area, annual electricity spend, and self-consumption profile. Rule-of-thumb:
| Building footprint | Max kWp | Gross cost | Net after FETF+AIA | kWh/yr | Payback |
|---|---|---|---|---|---|
| 200 m² (small barn) | 30 kWp | £21k | £11k | 28,000 | 1.9–2.4 yr |
| 500 m² (modern shed) | 75 kWp | £52k | £28k | 71,000 | 1.7–2.1 yr |
| 1,000 m² (large barn / grain store) | 150 kWp | £105k | £56k | 142,000 | 1.6–2.0 yr |
| 2,000 m² (poultry shed pair) | 300 kWp | £200k | £108k | 285,000 | 1.5–1.9 yr |
| 3,500 m² (multi-building dairy) | 500 kWp | £330k | £175k | 475,000 | 1.5–1.8 yr |
Figures assume south-facing 30° pitch, 70% self-consumption, 30p/kWh tariff, FETF 40% + 100% AIA on residual.
Structural considerations for older farm buildings
UK farm building stock spans 60+ years. Three structural patterns we routinely manage:
- 1. Asbestos cement roofing (1960s-1980s) — around 18% of UK farm buildings. Licensed removal must happen before any solar install. We quote combined re-roof + PV business case, often qualifying for combined tax relief.
- 2. Steel portal frames (1970s-1990s) — purlin spacing typically 1.5-1.8m centres, often rusted at the eaves. Each system needs load calcs against the actual frame — no generic templates.
- 3. Listed and traditional stone buildings — Listed Building Consent required. Heritage statement £3-8k. Adds 6-8 weeks to timeline but is routine for us.
Planning permission
Most rooftop solar on existing agricultural buildings qualifies as permitted development under Class A or Class B of Schedule 2 GPDO. Conditions:
- ✓ System size below 1 MW
- ✓ Panels do not project more than 200mm above the roof
- ✓ Building is not listed
- ✓ Building is not in a conservation area, AONB, or National Park
Outside these: full planning. We handle every application — see our planning page.
Grants available
- 🟢 FETF (England) — up to 40% capital, £100k cap. Full grants guide.
- 🟢 Welsh FBG-E — 40%, £12k-£100k
- 🟢 Scottish CARES — interest-free loans up to £150k
- 🟢 NI DAERA — 40% capital
- 🟢 100% Annual Investment Allowance — full year-one tax relief
- 🟢 Smart Export Guarantee — 4-15p/kWh for surplus
Frequently asked questions
Can I put solar panels on agricultural buildings?
Yes — most qualifies as permitted development. Building must not be listed and panels must not project more than 200mm above the roof.
What size system?
1,000m² barn takes 150-200 kWp; 500m² shed takes 75 kWp. Sized from 12 months of half-hourly meter data.
How much does it cost?
£600-£900 per kWp gross. 100 kWp install £60-75k gross / £36-45k net after FETF + AIA. Payback 1.7-2.1 years.
Asbestos cement barns?
Must be removed (licensed contractor) and replaced first. We coordinate the full removal-and-replacement-and-install package.
Listed buildings?
Yes — need full planning + Listed Building Consent. Heritage statement required. Adds 6-8 weeks.