Power it. Cleaner energy that pays for itself.
Commercial-scale solar PV, battery storage and EV charging, designed, installed and maintained in-house, and integrated with your roof and building works.
Energy is the fastest-moving cost on most balance sheets, and one of the biggest levers on carbon. Our energy division helps commercial clients take control of both, with renewable systems sized around how a building actually uses power.
Because we also build and re-roof, solar isn't bolted on as an afterthought. We can replace a tired roof and install the array in one coordinated programme, with both covered by a single combined 30-year warranty. Typical payback on our commercial solar schemes is around three to four years.
Where it works hardest
Factories and warehouses, farms and agriculture, hospitals and manufacturers, and construction sites: anywhere with roof space, land or high daytime demand.
The full renewable package.
Commercial Solar PV
Roof- and ground-mounted arrays sized to your load, from small units to multi-hundred-kilowatt schemes.
- Rooftop
- Ground-mount
- Tier-1 panels
- Monitoring
Energy Storage
Battery systems that store what you generate and cut peak-rate imports, resilience and savings in one.
- Batteries
- Peak shaving
- Backup power
Commercial EV Charging
Workplace and fleet charging, installed with the grid capacity and future demand in mind.
- Fleet
- Workplace
- Fast charging
Solar Carports
Turn car parks into generation: shade below, clean power above, EV charging built in.
- Carports
- Canopies
- Integrated EV
warranty
One roof. One array. One 30-year warranty.
Putting new panels on a tired roof is a false economy, and two contractors means two warranties with a grey area where they meet. When we fit your new roof and install your solar, both are covered by a single combined 30-year warranty from Cornerstone.
- One warranty, 30 yearsRoof and solar system covered together, with no disputes over who is responsible for the roof and panel interface.
- One coordinated programmeOur roofing and energy teams plan the work together, sharing access and scaffolding instead of mobilising twice.
- One point of contactIf anything ever needs attention, there is one team to call, for the whole life of the roof and the array.
The combined warranty applies when Cornerstone fits the roof and installs the solar system. Ask us for the full terms.
Curious what solar could save you?
Every site is different, but the pattern is consistent. Here’s what commercial solar typically delivers. Send us your roof or your energy bills and we’ll model your exact savings and payback, with no obligation.
We start with your actual half-hourly consumption data (or install monitoring), size the system to your load, and model generation, savings and payback before you commit. Because we also re-roof and build, we can replace a tired roof and install the array in one coordinated programme, covered by a single combined 30-year warranty, and fold it into one finance package (CAPEX, lease-to-own or a green loan) that’s offset from day one by your energy savings.
Built for how your sector uses power.
Every building is different. Explore how commercial solar works hardest in your world.
Factories & Warehouses
Big, unshaded roofs and steady daytime demand, the ideal match for commercial solar.
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Farms & Agriculture
Solar for dairy, poultry and arable sites, specified for farm conditions.
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Hospitals
Lower running costs and carbon, installed around live clinical services.
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Manufacturing
Lower production energy costs, with storage to protect the loads that cannot stop.
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Construction
Generation designed in from day one on new builds and refurbishments.
ViewSolar we've delivered.
Rooftop and ground-mount schemes cutting costs and carbon for real businesses. Select a project for the full story.
334 kWpEnergy · RoofingBooker Watford Roof & SolarA new roof and a 334 kWp solar PV system delivered together for Booker’s Watford cash-and-carry.View case study 
750 kWEnergy · IndustrialFDC solar PV schemeA rooftop solar installation for transport operator FDC Holdings, cutting energy costs and carbon across their central distribution hub.View case study 114 kWEnergy · RetailBooker Newton Abbott 114 kW SolarA 114 kW rooftop solar system in Devon with a combined 20-year roof-and-solar warranty and a 3.4-year payback.View case study 75 kWEnergy · AgricultureBilsborrow Hall Farm 75 kW SolarA 75 kW rooftop and ground-mounted solar system for a family dairy farm.View case study 
50 kWEnergy · RoofingLovania NurseriesA 50 kW solar array made possible only by re-roofing a fragile packing-house roof.View case study Commercial solar in action.
See our renewable energy projects come together, from survey to switch-on.
Guides and project stories.
GuidesCommercial solar payback explained: what affects it and how long it takesHow commercial solar payback works, what drives it, from daytime demand to roof condition, and how we model yours before you commit.Read the article GuidesBattery storage for business: when it makes sense and what it deliversWhen commercial battery storage makes sense, how it lifts solar self-consumption and how it keeps your business running through outages.Read the article 
GuidesShould you re-roof before installing solar? The case for doing both togetherWhy roof condition matters before solar, how a combined roof and solar project works, and the warranty when we fit the roof and the solar.Read the article Power your business with solar.
Our renewables team designs, installs and maintains commercial solar, storage and EV charging across the North West and the UK.
Renewable energy questions answered.
Can't see your question here? Our team is happy to talk it through.
What does your renewable energy division actually cover?
We design, install and maintain commercial solar PV, battery storage, EV charging and solar carports, all in-house. Because Cornerstone also builds and re-roofs, your energy system is integrated with your roof and building works rather than bolted on afterwards.
How quickly does commercial solar pay for itself?
Typical payback on a commercial system is two to four years, and our 334 kWp scheme at Booker Watford paid back in 3.1 years. Every site is different, so we model your exact savings and payback before you commit.
Can you replace our roof and fit solar at the same time?
Yes. We can replace a tired roof and install the array in one coordinated programme, with both covered by a single combined 30-year warranty.
How do you decide what size of system we need?
We start with your actual half-hourly consumption data, or install monitoring if you don't have it, then size the system to your load. We model generation, savings and payback before you commit, with no obligation.
How can we fund a renewable energy project?
We can fold the work into one finance package, whether that is CAPEX, lease-to-own or a green loan, offset from day one by your energy savings. Call us on 0800 011 9758 or send us your energy bills to get started.
