Key Takeaways
- Commercial solar PV typically pays back in 4–7 years depending on system size and energy usage patterns
- Systems above 3.68kW per phase require G99 DNO approval before installation (2–8 weeks)
- MCS certification is required for export payments and most funding schemes
- Wire Now is an MCS-certified contractor delivering commercial solar across London, Hertfordshire, and Essex
- Planning permission is normally not required for roof-mounted commercial solar under permitted development
Is Commercial Solar PV Worth It in 2026?
Commercial solar PV is one of the strongest investments a UK business can make in 2026. With electricity prices remaining elevated and typical payback periods of 4–7 years, businesses installing solar PV can expect 20+ years of reduced energy costs after the system pays for itself. The combination of self-consumption savings, export tariff income, and reduced carbon reporting obligations makes the financial case compelling.
For businesses with high daytime electricity consumption — such as warehouses, offices, retail premises, and manufacturing facilities — the economics are particularly strong because most generated electricity can be consumed on-site rather than exported at lower rates.
How Much Do Commercial Solar Panels Cost?
Commercial solar PV costs vary based on system size, roof type, and complexity of the electrical connection. As a general guide for 2026 UK prices:
- 10–50kW system (small commercial): £1,000–£1,200 per kW installed
- 50–250kW system (medium commercial): £800–£1,000 per kW installed
- 250kW+ system (large commercial/industrial): £700–£900 per kW installed
These prices include panels, inverters, mounting systems, cabling, and commissioning. Structural surveys, scaffolding, and DNO connection costs may be additional depending on the project.
What Size Solar System Does My Business Need?
The optimal system size depends on your electricity consumption profile and available roof space. A solar feasibility study will analyse your half-hourly consumption data, roof dimensions, orientation, and shading to recommend the right system size.
As a rough guide:
- A 50kW system needs approximately 200m² of roof space
- A 100kW system needs approximately 400m² of roof space
The goal is to size the system so that most generated electricity is consumed on-site. Oversizing leads to excess export at lower tariff rates, reducing overall ROI.
Use our Solar ROI Calculator →
Do I Need Planning Permission for Commercial Solar?
Roof-mounted solar panels on commercial buildings normally fall under permitted development rights and do not require planning permission, provided the panels do not protrude more than 200mm from the roof surface and the building is not listed or in a conservation area.
Ground-mounted systems and installations on listed buildings will typically need planning consent. Wire Now can advise on the planning requirements for your specific project as part of our feasibility assessment.
What Is the Difference Between G98 and G99?
G98 and G99 are Engineering Recommendations that govern how solar PV systems connect to the electricity grid. The distinction determines whether you need pre-approval from your Distribution Network Operator (DNO) before installation.
Read our detailed guide: Commercial Solar PV Regulations: G98 vs G99, MCS & DNO Approval Explained
Does My Installer Need MCS Certification?
MCS (Microgeneration Certification Scheme) certification is not legally required to install solar PV, but it is required to access export tariff payments (Smart Export Guarantee) and most funding or incentive schemes. Choosing an MCS-certified installer also ensures the system is designed and installed to recognised quality standards.
Wire Now is MCS-certified for solar PV installation. View our accreditations →
What ROI Can a Commercial Building Expect?
Return on investment depends on system size, electricity costs, consumption patterns, and export income. Typical scenarios for 2026:
- High self-consumption (70%+ on-site use): 4–5 year payback, 20%+ annual return
- Medium self-consumption (50–70%): 5–6 year payback, 15–20% annual return
- Lower self-consumption (below 50%): 6–8 year payback, 10–15% annual return
Battery storage can improve self-consumption ratios by storing excess daytime generation for evening or peak-rate use.
Is My Roof Suitable for Solar Panels?
Several factors determine whether a commercial roof is suitable for solar PV. Read our detailed guide for warehouse and industrial buildings: Solar PV for Warehouses and Industrial Units: A Practical Guide
Key considerations include structural load capacity, roof orientation and pitch, shading from adjacent buildings or equipment, roof material and condition, and access for installation and maintenance.
What About Battery Storage?
Commercial battery storage systems can complement solar PV by storing excess generation for use during peak-rate periods or after sunset. Battery costs have decreased significantly, and the combination of solar PV plus battery storage can increase self-consumption to 80%+ and provide backup power capability.
Battery storage is particularly valuable for businesses with evening or overnight operations, those on time-of-use tariffs, and buildings where grid export capacity is limited.
How Wire Now Delivers Commercial Solar Projects
Wire Now is an MCS-certified, NICEIC-approved contractor specialising in commercial solar PV installations across London, Hertfordshire, and Essex. Our process:
- Free site survey — Roof assessment, structural review, and consumption analysis
- Feasibility report — System design, ROI projections, and payback timeline
- DNO application — We handle the G98/G99 paperwork
- Installation — Our directly employed engineers install the system
- Commissioning — Full testing, MCS certification, and handover
- Ongoing monitoring — Optional maintenance and performance monitoring
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