How much do solar panels for farm buildings cost?

What UK farm-building solar actually costs in 2026

Headline cost-per-kW for farm-building rooftop PV in 2026 sits in three bands depending on system size:

• £900–£1,100 per kW for systems below 50 kW — typical dairy parlour, equestrian arena, small workshop, single livestock building on a smaller holding
• £800–£950 per kW for systems 50–250 kW — typical livestock shed, mid-size grain store, poultry shed, multi-building installs on a family farm
• £700–£850 per kW for systems above 250 kW — large multi-bay barns, intensive poultry, pig finisher complexes, big grain stores

That cost includes panels, inverters, racking, DC and AC cabling, electrical isolation, grid commissioning, monitoring portal, MCS commissioning paperwork, and the 10-year IWA workmanship warranty. It does NOT include re-roofing where the existing roof is asbestos cement or otherwise structurally unsuitable, structural reinforcement (rare on post-1995 buildings but sometimes required), or planning fees where planning is required (uncommon — most farm-building installs are Permitted Development under Class A Part 14 GPDO 2015).

Cost per building type — what to expect

Cost varies meaningfully by sub-vertical. Dairy parlours and livestock houses with continuous baseload tend to support larger systems (more roof, more on-site load to consume from) so cost-per-kW sits at the lower end of the range. Equestrian arenas and farm workshops typically have smaller roofs and moderate baseload, pushing cost-per-kW toward the upper range. Grain stores and poultry sheds can carry the largest single-building systems we install — often 300–600 kW per building on the largest holdings.

The single biggest cost variable is asbestos cement roofing. Pre-2000 farm buildings commonly have asbestos cement cladding, which cannot be retrofitted with PV under the Control of Asbestos Regulations 2012. The standard solution is a combined re-roof + PV project: HSE-licensed asbestos removal (£30–£50/sqm), profiled steel re-cladding (£45–£80/sqm installed), then PV on the new roof. A 2,000 sqm asbestos-clad livestock shed typically costs £75,000–£130,000 to strip and re-clad before any PV work — but the combined business case usually pays for both within the 25-year system life.

Financing routes for farm clients

Three financing routes are available to UK farm clients in 2026:

Capital purchase with 100% Annual Investment Allowance. The simplest route for farms with capital available. Full system capex paid upfront. The PV system qualifies as plant and machinery — fully expensable against trading profit in year one under the £1m AIA cap (which comfortably covers almost every farm-building install). For a limited company at 25% corporation tax, that's an effective 25% tax saving in the install year. Partnerships and sole traders benefit proportionally based on each partner's marginal tax position.

Asset finance — typically 5 to 10 year term. Bank or specialist lender provides the capital, the farm pays a monthly fixed amount, and the farm owns the system from day one. Most farm asset finance arrangements are EBITDA-positive from month one for buildings with strong daytime baseload — the monthly cost saving on grid electricity exceeds the monthly finance payment. AIB Group's Solar Farm Finance, Praetura's commercial solar package, Hampshire Trust Bank, and several mainstream lenders (Lloyds, NatWest, Barclays) all carry farm-PV-compatible products. Documentation typically takes 3–5 weeks alongside the project design phase.

Power Purchase Agreement (PPA). A third-party developer funds, installs, owns, and operates the system on the farm's roof or land. The farm buys the generated electricity at a discounted rate (typically 35–45% below grid retail) for a 15–25 year term. Zero capex from the farm; immediate energy cost reduction. Less attractive than the other routes if the farm has capital available, but ideal for farms with strong roof potential and limited capital flexibility. Most PPA offers cover systems above 250 kW only.

Hidden and variable costs

Costs that sometimes catch farm clients out:

• G99 grid connection fees. Distribution Network Operators (DNOs) charge for studies and connection works. Typical fee range: £2,000–£8,000 for systems below 250 kW; £8,000–£35,000 for systems 250 kW–1 MW; significantly higher for projects requiring substation reinforcement. We submit applications immediately after structural survey and the fee is quoted by the DNO directly.
• Structural survey and engineering. Most modern farm buildings need a brief structural assessment to confirm the frame can carry the additional dead load. Cost £400–£1,200 per building depending on complexity. Older buildings with no original calculations on file may need more extensive engineering — £1,500–£3,500.
• Scaffolding and access. Most farm building roofs are accessed via mobile elevating work platforms rather than scaffolding, which keeps costs down. Where scaffolding is required (eaves complexity, sloping site, height above 4m), expect £6–£12 per square metre of building perimeter.
• Asbestos cement removal. The biggest variable. £30–£50/sqm under licensed conditions, plus £14-day HSE notification and waste consignment fees. A 1,800 sqm asbestos-clad poultry shed typically costs £55,000–£90,000 to strip alone.
• Three-phase upgrade. If the building only has single-phase supply, upgrading to three-phase (often necessary for systems above 17 kW) costs £4,000–£18,000 depending on cable run and DNO works required.

Worked example — 240 kW Shropshire pig finisher

A typical farm-building install: 240 kW PV across three pig finisher house roofs in south Shropshire, on existing profiled steel cladding (no re-roof required). Total project cost £204,000 including DNO connection (G99 study £4,500 plus connection works £6,800), structural assessment £1,200, all panels (440 × LONGi 545W), three string inverters (Huawei SUN2000-100KTL-M2), all cabling and isolation, MCS commissioning. The farm trades as a limited company; 100% AIA against the partnership's 2026 trading profit delivered an effective £51,000 reduction in corporation tax payable. Net effective cost after tax relief: £153,000. Annual generation forecast 228,000 kWh, of which 86% self-consumed at a current grid retail of 24p/kWh = £47,000 of cost avoidance. Remaining 14% (32,000 kWh) exported under SEG at 11.5p/kWh = £3,680. Total year-one saving: £50,680. Simple payback after AIA: 3.0 years. Twenty-five year IRR modelled at 17.2%.

What we recommend for working out your numbers

Don't take a generic "£/kW × system size" estimate as gospel for your specific holding. Two farms with identical roof areas can deliver radically different economics depending on the on-site daytime baseload, the local DNO capacity, the existing roof condition, and the buildings' age and structural state. The right approach is a desk-based feasibility from your half-hourly meter data — we deliver this within 7 working days and it produces a building-specific cost estimate, generation forecast, self-consumption ratio, and 25-year financial model. We don't charge for this stage and we'll tell you honestly if the numbers don't stack up before we put a fixed-price proposal together.

If you want to scope a project today, the fastest way is to send us your half-hourly meter data (or the past 12 months' invoices if HH data isn't available), a building dimension sketch or aerial image, and a brief on which buildings you're considering for PV. We can usually deliver a meaningful indicative number within 48 hours and a full desk feasibility within 7 working days.