Commercial solar panels cost in the UK has stabilised through 2024-2026 at £600-£1,200/kW depending on scale. Module pricing has stabilised at 16-20p/Wp for utility-grade Tier-1 modules. Inverter pricing stable. The bottleneck on lead times has moved from modules to qualified installation labour and DNO grid connection capacity. We provide fixed-price quotes after structural and electrical survey — no surprises after sign-off.
Cost-per-kW by system size
Sub-100 kW: £900-£1,200/kW (project mobilisation amortised over fewer kW). 100-500 kW: £750-£950/kW. 500 kW – 1 MW: £700-£800/kW. 1-3 MW: £650-£750/kW. 3 MW+ port and data centre scale: £600-£700/kW. Below 50 kW, project economics typically don't justify DNO and design overhead.
Six factors driving cost variation
System size, roof condition (asbestos cement requires re-roof first; modern profiled steel is straightforward), electrical infrastructure (older buildings may need switchboard upgrade), DNO grid connection (varies wildly £2k-£500k+), marine corrosion environment (port sites need austenitic stainless or marine-grade aluminium fixings — adds 8-12%), sprinkler clearance complexity. We assess all six during structural survey.
After-tax economics
For £900k commercial install (sub-AIA cap): £225k year-1 tax shield (25% corp tax × £900k AIA). Net effective cost £675k. Year-1 cash benefit at 80% self-consumption: £180k. After-tax cash payback: 3.0 years. Simple payback ignoring tax: 4.7 years. 25-year IRR: 22%.
Common questions about commercial solar cost
What is the cost of commercial solar panels in the UK?
£600-£1,200/kW installed. Smaller systems (sub-100 kW) at £900-£1,200/kW; mid-scale (500 kW – 1 MW) at £700-£800/kW; large 3 MW+ systems at £600-£700/kW.
How much do commercial solar panels cost per panel?
Per-panel cost depends on system context, not panel alone. Tier-1 540W panels installed cost roughly £400-£500 per panel (panel + mounting + inverter share + installation labour share + DNO + design overhead). Per-kW pricing is the standard commercial benchmark.
Are commercial solar panels worth the cost?
For most UK owner-occupiers and long-lease tenants: yes. 4-6 year simple payback, 22-30% 25-year IRR after AIA tax shield. Combined with EPC compliance and customer Scope 3 audit pack, the case is overwhelming.