How much do solar panels cost for a UK farm in 2026?

Farm solar capex in 2026 sits in a fairly tight band per kW once you control for system size and roof condition. The headline numbers for a standard rooftop install on PV-suitable cladding: £900–£1,100 per kW for systems below 50 kW (small dairy parlour, equestrian arena, workshop); £800–£950 per kW for 50–250 kW systems (typical livestock shed, mid-size grain store, poultry shed); £700–£850 per kW for systems above 250 kW (large multi-bay barns, intensive poultry, big grain stores). Below we set out what’s included, what isn’t, and how to estimate total project value for your specific holding.

What you pay for in a typical farm install

A typical fixed-price proposal for a 250 kW farm install (a representative mid-size system covering a livestock shed and an adjacent workshop) totals around £210,000 fully installed. That price covers: 460 modules at 540W rated output (typically JA Solar, LONGi, Jinko, REC, Q-Cells or Trina); three string inverters (SolarEdge, SMA, Huawei, Fronius or Goodwe variants depending on the building topology and shading); racking and mounting (Schletter, Renusol or K2 systems sized for the cladding profile); DC and AC cabling rated to BS 7671; electrical isolation and protection equipment; structural survey including drone roof imaging; G99 grid connection submission to the regional DNO; MCS commissioning paperwork and certification; SEG application support; monitoring portal access for the system life; and 10-year IWA insurance-backed workmanship warranty (transferable to incoming farm partners or new tenants).

What’s not included (and when these costs apply)

Several add-ons commonly appear on farm projects but sit outside the base PV scope. Re-roofing on asbestos cement buildings adds £30–£50/sqm for HSE-licensed removal plus £45–£80/sqm for profiled steel re-cladding. A 1,500 sqm livestock shed roof typically costs an additional £113,000–£195,000 to re-clad before PV — but the PV business case routinely pays for 60–100% of this re-roof over the 25-year system life. DNO grid connection contestable works on capacity-constrained rural feeders can add £15,000–£70,000 for a 250–500 kW system. Three-phase electrical upgrade (if the building only has single-phase) costs £4,000–£18,000 depending on cable run. Battery storage adds £400–£700 per kWh installed — a 110 kWh battery alongside the 250 kW PV system would add £55,000–£77,000 and typically improves payback by 4–6 months for arable farms with seasonal grain-drying peaks. EV charging infrastructure for the farm fleet (ATVs, light pickups, eventually tractors) costs £1,500–£3,500 per 7–22 kW socket installed, with up to 75% covered by the OZEV Workplace Charging Scheme.

Cost-per-kW falls as system size increases

Like most capital plant, farm PV cost per kW falls with scale. The fixed elements (DNO submission, structural survey, scaffolding mobilisation, MCS commissioning, project management) get amortised across more capacity. Sub-50 kW systems sit at the upper end of the cost curve (£900–£1,100/kW). The 50–250 kW band drops to £800–£950/kW. Above 250 kW the cost-per-kW reaches £700–£850, with the largest multi-building installs (500 kW–1 MW+) approaching £700/kW. If you’re scoping a single small building, it’s often worth asking whether splitting capital across multiple buildings under a single G99 application would unlock both better unit economics and a faster overall delivery timeline.

Financing routes affect total project value

The three financing routes — capital purchase with 100% Annual Investment Allowance, asset finance over 5–10 years, and Power Purchase Agreement (PPA) — change the cash-flow profile dramatically. Capital purchase with AIA gives the lowest total system life cost but requires £200k+ of capex upfront. Asset finance over 7 years typically delivers an EBITDA-positive monthly cash flow from month one for any dairy, intensive livestock or grain-store install with strong daytime baseload — the monthly grid-cost saving exceeds the monthly finance payment from day one. PPA shifts all capex risk to a third-party developer who buys the electricity from you at a discount-rate over 15–25 years; the farm pays zero upfront but captures less of the long-run value. Most of our farm clients today use either capital with AIA (for smaller incorporated farms) or asset finance (for capital-light operations).

Worked example — 320 kW dairy farm in Cheshire

A representative recent install: a 480-cow Cheshire dairy farm with three connected livestock buildings totalling 2,800 sqm of pre-1995 asbestos cement roofing. Annual pre-install electricity spend £62,000. We delivered a combined re-roof + PV project totalling £465,000 — £165,000 for asbestos removal and profiled steel re-cladding, plus £300,000 for 320 kW of PV across all three building roofs. The system achieves 92% self-consumption thanks to 24/7 robotic milking and bulk-tank cooling baseload. Annual saving £68,500 in year one (cost avoidance plus SEG export). Simple payback 6.8 years on the combined project (5.2 years on the PV component alone). 100% AIA against the partnership’s trading profit at 25% corporation tax delivered an effective £116,000 reduction in year-one corporation tax. Net effective payback (PV component only): 3.9 years.

What to do next

Send us your half-hourly meter data (or the past 12 months of electricity invoices), a sketch or aerial photo of the buildings you’re considering, and a brief note on your farm operation. We deliver a meaningful indicative cost within 48 hours and a full desk feasibility study within 7 working days. Each desk feasibility includes building-specific cost estimate, generation forecast, self-consumption ratio, 25-year DCF financial model with three financing scenarios, and an honest assessment of whether your site suits solar.