The Complete Guide to Commercial Solar Power in the UK

Benefits, ROI and practical considerations for commercial buildings.

We’ve compiled a complete guide to commercial solar power in the UK. Why? Because, as energy costs rise and sustainability moves up the corporate agenda, more commercial property owners are turning to solar power as a smart, long-term investment. But what are the actual benefits of commercial solar? How does the return on investment stack up? And what planning or maintenance is involved?

This guide to commercial solar breaks down everything you need to know about solar panels and systems, from installation through to incentives and funding, building regulations and long-term performance, so that you can make an informed decision.

At DMB Solar, we specialise in solar panels, battery storage and EV charging solutions. We assess, design, install and critically, maintain and repair renewable energy systems for businesses across the UK.

We are here to simplify your solar installation journey. Contact us to learn more about working with DMB Solar.

What’s covered in this guide to commercial solar power?

Why solar makes sense for commercial properties
Choosing the right installer – certification explained
Financial returns and ROI explained
Grants, tax incentives and funding
Financing your commercial solar
Planning permission and building regulations
Maintenance, cleaning and longevity
Carports, battery storage and smart features
Final checklist for business owners

1. Why solar makes sense for commercial properties

Market conditions around solar are making it an increasingly attractive technology. The convergence of technological advances and reduction in installation costs means that it is now an achievable and commercially viable option for buildings, benefitting both building owners and tenants.

Technological

The cost of solar technology, especially solar panels and inverters has dropped significantly in the past decade. This has shortened payback periods and made solar systems more financially viable for smaller and mid-sized businesses.

Modern solar systems integrate with energy monitoring tools, helping businesses track usage, identify inefficiencies and improve overall energy strategy. Solar is now a proven technology with a long lifespan (25+ years) and minimal maintenance requirements. Many systems come with performance guarantees and strong manufacturer warranties.

Battery storage technology has also improved, making it easier for commercial buildings to store excess solar energy and use it during peak hours or at night, further improving ROI.

Financial

Energy prices have increased dramatically in recent years, squeezing margins for businesses. Solar offers a way to take back control by generating your own low-cost, predictable energy on-site.

Practical

Many commercial buildings have large, flat rooftops ideal for solar installations. Using this underutilised space to generate power turns a passive asset into a productive one. Even buildings with little to no roof space can utilise solar energy through carports.

Sustainable

Businesses are under increasing pressure to reduce their carbon footprint and show progress on environmental, social and governance (ESG) goals. Solar is a visible, measurable and impactful step towards net-zero.

Reputational

Customers, clients, investors and employees are increasingly favouring sustainable businesses. Solar signals environmental leadership and allows customers and employees to benefit from solar on-site.

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The benefits of solar panels

Lower operational costs: Generate electricity on-site, reducing reliance on volatile grid prices. Solar energy aligns perfectly with peak business hours – when demand and costs are highest.
Environmental responsibility: Achieve Net Zero goals, reduce carbon footprint and boost ESG credentials. Many procurement and tender processes now reward green supply chains.
Enhanced asset value: Properties with solar benefit from improved EPC ratings, long-term energy savings and greater appeal to tenants or buyers.
Grid independence and resilience: Combined with batteries, solar panels can help maintain operations during power cuts and avoid demand spikes.

The business benefits of solar

Reduce overheads: Generate and store clean, low-cost energy on-site, and reduce your electricity bills by up to 70–100%, depending on your system size and usage.
Forecast energy bills: Pre-purchase electricity at a fixed unit price, forecast your long-term energy costs and protect your business against future increases in utility prices.
Improve green credentials: Utilise renewable energy to offset your corporate carbon footprint and lower your energy demand from fossil fuels.
Protect your business from power shortages: Generate and store your own energy, reduce reliance on the National Grid and protect your business from outages and downtime.
Achieve a healthy ROI: A typical commercial solar panel system can generate low-cost electricity for 15-25 years, typically delivering returns of around 10-12% per annum and paying back its installation costs in around 6-8 years. Some of our clients have paid back in 5 years.
Create a competitive advantage: Promote your green initiatives, enhance your reputation and strengthen relationships with supply chains and customers who want to work with environmentally responsible businesses.

2. Choosing the right installer – certification explained

Access grants through a certified installer

Certification is particularly important for commercial solar projects because it’s often a prerequisite for accessing financial incentives, securing planning permission (where needed) or meeting ESG and sustainability requirements. It also adds credibility when applying for green finance.

Ultimately, certification helps protect your investment.

MCS certification is the standard for solar (a certification we hold at DMB) and covers both commercial and residential buildings.

Microgeneration Certification Scheme (MCS) certification explained

MCS is a UK quality assurance standard for low-carbon energy technologies, including solar PV systems. It ensures that both the solar panels and the installation meet rigorous technical and safety standards. For commercial buildings, using an MCS-certified installer helps guarantee that the system will be reliable, efficient and compliant with UK regulations and industry best practices.

Secondly, to benefit from the Smart Export Guarantee (SEG), which pays you for any surplus electricity your solar system exports back to the grid, your system must be installed by an MCS-certified installer.

In short, MCS certification is essential for accessing revenue streams and ensuring quality assurance throughout the lifecycle of your commercial solar project.

3. Financial returns and ROI explained

We often get asked what the financial returns are for commercial solar, and of course, it depends on the system you install, whether you combine it with battery storage and EV charging and if you add carports, but we have pulled together some key stats so that you can take a look at the potential financial benefits.

Key stats

The average payback period for commercial solar is 5–8 years on average, with systems lasting in the region of 25-30 years for panels and 10-15 years for inverters.

Depending on system size, usage profile, and energy tariffs, savings could reach £100,000–£150,000 over 25 years.

The Smart Export Guarantee (SEG) lets you sell surplus electricity to the grid, meaning you can create a new revenue stream.

Charging employees a reduced fee to charge their cars means you can save them money while creating an additional revenue stream. Businesses can offer staff EV charging at a discounted rate or for free, which is a valued perk. HMRC currently does not treat employer-provided electricity for EV charging at work as a taxable benefit in kind. You can check this out for your business on the gov.uk website.

Best ROI: When energy usage aligns with daylight hours and a high proportion of solar is used on-site, you will get the best return on investment.

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4. Grants, tax incentives and funding

Policies in the UK, like the Smart Export Guarantee (SEG), 100% capital allowances, and local grant schemes, make solar a more financially attractive proposition. For the most up-to-date advice on available grants and funding, please speak to our team.

Maximising incentives

Combining a local business grant with capital allowances like the Annual Investment Allowance (AIA), Smart Export Guarantee (SEG) payments for surplus energy sold back to the grid, and reduced energy bills can make solar systems cash positive much sooner – often within 3–5 years for commercial properties.

Capital allowances let you claim 100% tax relief on solar installations, and Power Purchase Agreements (PPAs) allow zero-upfront-cost installation. Asset finance and green loans are available via banks and government-backed schemes.

Solar qualifies for 100% tax relief in the year of purchase under the Annual Investment Allowance (AIA), subject to limits.

Regional Growth Hubs offer grant funding for SMEs

Local Enterprise Partnerships (LEPs) in England were once a key part of local economic development, but their functions have now been transferred to local authorities. Most LEP functions are now handled by local governments, some of which have established Business Boards and Growth Hubs as replacements.

Their purpose is still to bring together local authorities, businesses and academic institutions to drive economic growth and innovation. One of the ways they do this is by offering grant funding and business support to small and medium-sized enterprises (SMEs), including green energy upgrades like solar installations.

Many offer or administer low-carbon or sustainability-focused grant schemes to help businesses invest in energy efficiency and renewable energy.

Grants:

Can cover a percentage of upfront installation costs (typically 30–50%)
May be capped (e.g. £5,000–£20,000 per project), but can still make a significant difference to ROI
Are often available for solar PV systems, battery storage, energy audits and related technologies

Availability

Funding availability and criteria vary by region. Support is tailored based on local priorities, but common themes include reducing carbon emissions, supporting clean growth and improving business competitiveness.

Where to find out more

You can typically find information on funding via your regional Growth Hub website. These organisations also provide hands-on support with grant applications and business case development.

Good to know

Growth Hub grants are often tied to government-backed funding rounds (like the UK Shared Prosperity Fund or Growth Deals), so they may be available for limited periods and are usually first-come, first-served.

5. Financing your commercial solar

Agricultural Grants

Some farming and agricultural businesses can apply for grants to fund energy efficiency installations. There is a Farm Productivity Grant (subject to funding rounds) that provides up to 100% of the cost for solar systems.

Power Purchase Agreement (PPA)

Many businesses opt for a Power Purchase Agreement (PPA) or green asset finance, which allows them to install solar with zero upfront cost. The PPA asset funder will retain ownership, but your installer will include a warranty for 2-5 years.

Power is purchased at an agreed-upon rate, which is below the normal charge for energy. These types of schemes typically last for 20-25 years.

Asset Finance

Asset finance is simpler – once paid, the ownership of the system reverts to the building owner. Typically, these run over five years and are funded from savings.

Get in touch to discuss your options with a member of our team.

6. Planning permission and building regulations

In many cases, solar PV installations on commercial buildings do not require planning permission because they fall under Permitted Development Rights (PDR) – provided certain conditions are met.

To qualify as permitted development, your solar installation must:

Be below a certain size – the system must not exceed 1 megawatt (MW) capacity
Be installed on a building (not ground-mounted)
Not project more than 200mm from the surface of the roof

Not be on a listed building or in a protected area, such as conservation areas, national parks, Areas of Outstanding Natural Beauty (AONBs), or world heritage sites
Not cause visual harm or overshadow neighbours

If you’re mounting panels on the roof of an existing commercial building, you’re more likely to qualify.

Important things to consider:

Ground-mounted solar typically requires planning permission unless very small-scale.
Even under permitted development, local authorities can challenge installs they feel have a visual or community impact.
All commercial installations should notify the Distribution Network Operator (DNO) under G99/G100 rules, even if under 1MW.

Building regulations for commercial solar in the UK

Regardless of whether planning permission is needed, building regulations always apply. These rules ensure the safety, energy efficiency and structural soundness of the installation.

Key areas covered include:

Structural integrity – the roof must be strong enough to bear the additional load of the solar panels. A structural survey may be required to confirm this.

Fire safety – fire risks must be mitigated through appropriate inverter placement and cable routing. Panels and electrical components must meet UK safety standards.

Wind and weather resistance – panels and mounting systems must be able to withstand local wind loads and weather conditions. This is especially important on high-rise or coastal commercial buildings.

Electrical safety – the installation must comply with the IEE Wiring Regulations (BS 7671). Work must be carried out by a qualified electrician or installer registered with a competent person scheme (e.g. NICEIC, NAPIT, MCS).

Tip: Use an MCS-certified installer (like DMB Solar) – they’ll ensure your system meets all the technical and regulatory standards, and you’ll be eligible for incentives like the Smart Export Guarantee (SEG).

7. Maintenance, cleaning and longevity

Maintenance of commercial solar panels

Solar PV systems are generally low-maintenance, but regular checks help optimise performance, extend lifespan and prevent downtime. Typical maintenance tasks include:

Annual servicing of panels, inverters, wiring and mounting systems
Performance monitoring via software or a dashboard to detect drops in output
Thermal imaging or electrical tests (optional but helpful for larger systems)

Who should maintain the system?

Use an MCS-certified maintenance contractor. For large systems, consider a maintenance contract with remote monitoring.

Cleaning of commercial solar panels

In the UK’s rainy climate, solar panels generally self-clean to a degree – but commercial systems benefit from periodic cleaning to remove bird droppings, moss, lichen or leaf debris (especially in rural or wooded areas), airborne dust, pollution or grime (especially in industrial areas).

How often should they be cleaned?

Once a year is usually sufficient for most UK commercial rooftops

*In high-soiling areas (farms, factories, coastal sites), consider cleaning twice a year

Cleaning methods:

Soft brush with deionised water – avoids mineral build-up
Drone-assisted or pole-fed systems for hard-to-reach rooftops
Avoid abrasive materials or detergents that may scratch the glass or void warranties
We recommend using a qualified maintenance company for cleaning

Longevity of solar systems

We have already mentioned that solar panels typically last 25-30 years, inverters 10-15 years (inverter replacement is the main maintenance cost over time) and mounting structures last 20-30 years if galvanised or aluminium-based.

Panels generally degrade slowly, losing around 0.3%–0.5% efficiency per year and after 25 years, most panels still operate at 80–90% of original capacity. Check your system’s performance warranty – most include 25-year guarantees on output levels.

Maintenance costs

Annual operations and maintenance costs for commercial systems typically range from £10–£20 per kW installed.

Cleaning costs vary by building access and system size, but typically range from £300–£1,000 annually.

Well-maintained systems increase your ROI by sustaining high performance and reducing system downtime.

SERVICING & MAINTENANCE

8. Carports, battery storage and smart features

It wouldn’t be a complete guide to commercial solar power without looking at the other supporting options, standard panels aside, that will make your solar setup as commercially viable as possible.

Solar carports are ideal for sites without roof space and provide shelter whilst integrating with EV charging.

Solar carports – what are they?

Solar carports are overhead structures installed in car parks, fitted with solar panels on top. They generate clean electricity while providing covered parking – a win-win for space efficiency and sustainability.

The benefits of solar carports

Space optimisation: Generates electricity from otherwise unused space (car parks).
Shelter: Protects vehicles from the sun and adverse weather.
Large-scale installation: Ideal for businesses, retail parks, hospitals or industrial estates with large car parks.
On-site EV charging: Can be paired with EV charging stations for staff or customers, making them future-ready.

The business benefits of solar

Reduce overheads: Generate and store clean, low-cost energy on-site, and reduce your electricity bills by up to 70–100%, depending on your system size and usage.
Forecast energy bills: Pre-purchase electricity at a fixed unit price, forecast your long-term energy costs and protect your business against future increases in utility prices.
Improve green credentials: Utilise renewable energy to offset your corporate carbon footprint and lower your energy demand from fossil fuels.
Protect your business from power shortages: Generate and store your own energy, reduce reliance on the National Grid and protect your business from outages and downtime.
Achieve a healthy ROI: A typical commercial solar panel system can generate low-cost electricity for 15-25 years, typically delivering returns of around 10-12% per annum and paying back its installation costs in around 6-8 years. Some of our clients have paid back in 5 years.
Create a competitive advantage: Promote your green initiatives, enhance your reputation and strengthen relationships with supply chains and customers who want to work with environmentally responsible businesses.

Planning and technical considerations

Carports may require planning permission and require careful design to optimise sunlight angles and load-bearing structures. They are typically more expensive to install than rooftop systems but offer added commercial possibilities.

Battery storage – what is it?

Battery storage systems store excess solar energy produced during the day and release it when needed, especially during evenings or peak tariff periods.

The benefits of battery storage

Energy independence: Allows for greater self-consumption of solar power and reduces reliance on the grid during high-cost times.
Flexibility: Means businesses can store and shift their energy usage, charging during off-peak hours and discharging during peak hours (time-of-use tariffs).
Backup power: Improves resilience to power cuts, keeping your business operating during outages.
Earning potential: Enables businesses to participate in Demand Side Response (DSR) schemes and sell stored energy back to the grid.

The business benefits of solar

Reduce overheads: Generate and store clean, low-cost energy on-site, and reduce your electricity bills by up to 70–100%, depending on your system size and usage.
Forecast energy bills: Pre-purchase electricity at a fixed unit price, forecast your long-term energy costs and protect your business against future increases in utility prices.
Improve green credentials: Utilise renewable energy to offset your corporate carbon footprint and lower your energy demand from fossil fuels.
Protect your business from power shortages: Generate and store your own energy, reduce reliance on the National Grid and protect your business from outages and downtime.
Achieve a healthy ROI: A typical commercial solar panel system can generate low-cost electricity for 15-25 years, typically delivering returns of around 10-12% per annum and paying back its installation costs in around 6-8 years. Some of our clients have paid back in 5 years.
Create a competitive advantage: Promote your green initiatives, enhance your reputation and strengthen relationships with supply chains and customers who want to work with environmentally responsible businesses.

Cost and ROI:

Battery prices have been falling, but they still add to upfront costs. Payback improves if the business has variable tariffs, EVs or operates in areas with unstable grid access.

Smart features – what are they?

Smart solar systems use advanced monitoring, analytics and automation to optimise performance and savings.

Key smart features:

Smart inverters that convert DC electricity to AC with optimised output
Some allow remote control, grid interaction and battery integration
Real-time visibility of system performance, energy generation and consumption
Help spot faults or inefficiencies early
Can be accessed remotely via apps or online dashboards
Energy Management Systems (EMS) automate when to use, store or export electricity based on pricing and demand and can integrate with building management systems (BMS) for holistic control
Smart solar systems can prioritise solar energy to power EV chargers during peak sun hours, which is useful for businesses moving towards fleet electrification

9. Final checklist for business owners

If you’re not quite ready to move forward, then please feel free to print this guide to commercial solar or bookmark this page (which we will update as things change).

If you’re ready to take the next step, then below is a handy checklist of things to consider.

Business owner checklist: