The 3 best solar energy companies in the UK

Introduction

If you’re searching for the best solar energy companies UK homeowners and businesses can trust in 2025, you’re in the right place. Whether you’re comparing solar power companies, browsing top solar brands, or trying to identify the best solar providers, this guide has you covered.

I live in a semi off-grid cabin and rely on solar power to cut energy bills and live more sustainably. My setup isn’t massive — just a small solar array, a battery bank, and a few carefully chosen appliances — but it’s made a real difference.

And I’m far from alone.

As energy prices keep climbing, more people are turning to greener, more independent solutions. That makes now the ideal time to consider solar for your home, business, or off-grid space.

What This Guide Covers

In this guide, you’ll find:

• ✅ The top-rated solar companies in the UK
• 🔧 The best options for full-service installs and DIY solar kits
• 🧭 Help choosing a provider that suits your lifestyle, budget, and energy goals

Whether you want a hands-off installation or you’re ready to build your own off-grid system, this guide will help you make an informed decision.

You’ll learn what makes each company stand out, how to choose a reputable UK solar installer, and what to consider when it comes to warranties, service, and support. I’ve also included:

• A handy side-by-side comparison table
• Real-world pros and cons
• Bonus tips for anyone exploring DIY solar kits UK wide

Let’s dive into the best solar energy solutions for 2025 — and help you take control of your energy future.

Quick Comparison Table – UK Solar Providers at a Glance

Choosing between the best solar panel companies in the UK can feel overwhelming — especially when each one offers something slightly different. That’s why we’ve put together this quick comparison table to help you compare the top solar power companies side-by-side and spot the features that matter most.

Whether you’re after a full-service professional installation or a flexible DIY kit for an off-grid setup, this table will help you compare your options quickly and easily.

Solar Company Comparison Table

How to Use This Table

• ✅ = Service is offered or supported
• ❌ = Not offered or not the company’s focus
• Warranties may differ depending on the specific products you choose
• Ratings reflect the most recent Google or Trustpilot scores at time of writing

This chart gives you a snapshot of what each provider specialises in. Still not sure where to start? Keep reading to compare the best solar installers UK wide — and find the one that best fits your energy goals.

Sunstore Solar Review – Best Solar Panel Company in the UK for Off-Grid & DIY Kits

🟠 At a Glance

🛠️ Warranty: Varies by product (up to 10 years)

📍 Based in: West Sussex

🏠 Domestic installs: ❌ (DIY kits only)

🏢 Commercial installs: ❌

⭐ Google rating: 4.6 (Trustpilot)

🔋 Battery storage: Yes (included in many kits)

🚫 EV charging setups: ❌

If you’re living off-grid, travelling in a campervan, or simply want more control over your energy setup, Sunstore Solar stands out as a top choice.

As one of the best solar panel companies in the UK for flexible, off-grid solutions, Sunstore offers ready-made kits tailored for UK-based homes, cabins, boats, vans, and garden sheds. Their approach makes it easy to build your own system — no expert skills required.

Why We Recommend Sunstore Solar

I use a small solar array to help power my semi off-grid cabin, so I know first-hand how well Sunstore’s kits perform. Their customer support is responsive and helpful, and their products are consistently reliable.

Instead of shopping around for separate panels, batteries, and cables, you can order everything in one pre-tested, compatible kit. It saves time, cuts stress, and gets your setup running faster.

Best For

• Cabin and off-grid power systems
• Vanlife and campervan conversions
• Garden offices, workshops, or remote sheds
• DIYers wanting to save money and stay flexible

What They Offer

• 🔋 Complete off-grid kits with panels, controllers, batteries, and wiring
• 🧰 Optional add-ons like inverters, mounting kits, and cables
• ⚡ Portable solar gear for mobile or temporary setups
• 📦 Fast UK-wide delivery on all kits

Pros & Cons

Pros:

• ✅ Perfect for self-installers and off-grid setups
• ✅ Budget-friendly and easy to expand later
• ✅ Helpful support and clear documentation
• ✅ Everything works together straight out of the box

Cons:

• ❌ No professional installation — DIY only
• ❌ Not suitable for large domestic or commercial systems

Final Word

If you’re after a flexible, affordable way to power your off-grid space — and don’t mind handling the install — Sunstore Solar is easily one of the best solar energy companies UK customers can trust for reliable DIY solutions.

It’s also a strong contender for anyone seeking a best-in-class solar power company with fast UK delivery and hands-on support.

👉 Check out Sunstore Solar kits here

Joju Solar Review – Best for Community-Focused Installations

At a Glance

• 📍 Based in: Sheffield
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 5.0
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Yes
• 🔧 Warranty: 25 years (panels)

If ethics, experience, and long-term support matter to you, Joju Solar is a company worth serious consideration. They’re one of the best solar energy companies UK homeowners and councils rely on — especially for fully-managed solar panel installations.

With over 17 years of experience and roots in Sheffield, Joju has built a strong reputation working with local authorities, schools, social housing projects, and environmentally conscious homeowners. In fact, they were among the first UK companies to offer Tesla Powerwall installations and continue to lead in community-first renewable energy.

Why Joju Solar Stands Out

Joju’s strength lies not just in their technology, but in their values. They’re genuinely passionate about helping individuals and communities access clean, affordable energy.

If you’re looking for a provider who can handle everything — from system design and installation to monitoring and battery backup — Joju offers a dependable, end-to-end solution.

Best For

• Homeowners seeking a stress-free, full-service installation
• Councils, schools, and housing associations
• Anyone who values ethical service and social impact

What They Offer

• 🔧 Complete installation of panels, batteries, and EV chargers
• ⚡ Tesla-certified and MCS-accredited for quality and compliance
• 🏆 Multiple industry award-winners
• 🌍 Active partnerships with more than 80 UK councils

Pros & Cons

Pros:

• ✅ Excellent customer support and a perfect 5-star Google rating
• ✅ Strong track record in both public sector and residential installs
• ✅ Transparent, community-driven company ethos

Cons:

• ❌ Longer wait times due to high demand
• ❌ Higher upfront costs, though matched by long-term value

Final Word

If you’re asking what are the best solar companies for reliable full-service installation, Joju Solar deserves a top spot among the best solar installers UK. With their base in Sheffield and a strong community-first approach, they continue to prove why they’re one of the best solar companies in the UK.

👉 Visit Joju Solar to learn more or request a free quote.

Deege Solar Review – Best All-Round Installer with Smart Tech

At a Glance

• 📍 Based in: Essex
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 4.4
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Yes
• 🔧 Warranty: Up to 25 years (varies by product)

If you’re looking for a solar installer that combines affordability, innovation, and long-term support, Deege Solar stands out as one of the UK’s top best solar companies.

Based in Essex and operating across the UK, Deege brings over 12 years of experience to the table and has completed more than 25,000 installations. They partner with leading brands like SolarEdge, Growatt, and Panasonic, and their affiliation with Octopus Energy makes them a strong choice for those wanting to connect their solar setup with a flexible energy tariff.

Why Deege Solar Is a Top Pick

Deege is known for making solar simple, smart, and scalable. Whether you’re after a basic setup or a system packed with real-time monitoring and battery storage, they’ve got options to suit your needs.

What really sets them apart is their focus on education. Through social media guides and one-on-one consultations, they help demystify solar — especially for beginners.

Best For

• Homeowners looking for value and smart technology
• Businesses needing scalable, battery-ready systems
• Beginners who want a clear, supportive experience

What They Offer

• ☀️ Nationwide installation of panels, batteries, inverters, and EV chargers
• 🔌 Smart solar tech with app-based monitoring and system control
• 🏅 Award-winning service and growing customer base
• 📈 System designs that work with agile and dynamic energy tariffs

Pros & Cons

Pros:

• ✅ Well-rounded offering with strong customer service
• ✅ Smart tech features for those who want more insight and control
• ✅ Clear, upfront pricing and strong educational resources

Cons:

• ❌ Some customer reviews remain unanswered
• ❌ High demand can lead to limited appointment availability

Final Word

If you want a solar installer that delivers smart features, strong support, and nationwide service without overcomplicating the process, Deege Solar is a fantastic choice. Their modern approach, reliable partnerships, and customer-focused service make them one of the best rated solar companies and one of the best companies that install solar energy in the UK.

👉 Visit Deege Solar to explore their services or request a quote.

Geo Green Power Review – Best for Business and Long Warranties

At a Glance

• 📍 Based in: Nottingham
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 4.3
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Optional/Project-based
• 🔧 Warranty: 25 years (panels), 20 years (inverters)

If you’re running a business or planning a large-scale installation, Geo Green Power should definitely be on your radar. Known for its focus on commercial solar projects and long-term support, this Nottingham-based company has earned the trust of major brands like Volkswagen, JCB, and G4S.

Thanks to their standout warranties — which go well beyond the industry standard — Geo Green Power ranks among the best solar energy companies UK organisations can count on for reliable performance and long-term peace of mind. That makes them a top choice among solar power companies and one of the best solar companies for businesses in the UK.

Why Geo Green Power Deserves a Spot

Geo Green Power excels when it comes to large and technically complex installations. From full solar panel systems for warehouses to advanced battery storage for public buildings, they handle it all with professionalism and precision.

While they do offer domestic services, their true strength lies in commercial-scale solar projects.

What really sets them apart is their investment in research and development — a rarity in the UK solar industry. Instead of just keeping up with solar trends, they actively help shape the future of renewable energy.

Best For

• Businesses and large commercial properties
• Agricultural and industrial energy users
• Homeowners who want long-lasting, premium protection

What They Offer

• 🏭 Full solar systems tailored for commercial buildings
• 🔋 Battery storage and EV charging available on a project basis
• 🔧 25-year panel warranties and 20-year inverter warranties
• 📉 Support with carbon reduction planning and energy efficiency strategies

Pros & Cons

Pros:

• ✅ Excellent long-term warranty coverage on panels and inverters
• ✅ Strong portfolio with high-profile commercial clients
• ✅ Actively engages with customer feedback online

Cons:

• ❌ Fewer public reviews than some competitors
• ❌ Not suitable for DIY enthusiasts or small-scale home setups

Final Word

If you’re managing a commercial site or simply want a premium solar system backed by long-term support, Geo Green Power is well worth considering. Their focus on innovation, reliability, and large-scale expertise makes them one of the top business solar electricity setup companies and a leading name among commercial solar panel installers in the UK.

👉 Visit Geo Green Power to learn more or request a commercial quote.

How to Choose the Right Solar Setup for You

Choosing the right solar setup isn’t just about picking a company — it’s about understanding which type of system fits your home, lifestyle, and budget best.

To help you make the right decision, let’s break it down into two main paths: going with a full-service solar installation or opting for a DIY solar kit.

Full-Service Solar Installation – Best for Simplicity

If you’d prefer someone else to handle the entire process — from the initial design and planning to the final paperwork — hiring a professional installer is the way to go.

Best for:

• Homeowners with limited time or technical know-how
• Properties that need planning permission or structural assessments
• Anyone wanting long-term support, smart apps, and warranty-backed service

What to look for:

• ✅ MCS certification (Microgeneration Certification Scheme)
• ✅ RECC membership (to ensure ethical practices)
• ✅ Strong Google reviews and relevant case studies
• ✅ Transparent, itemised quotes with no hidden charges
• ✅ Research which solar companies have the best reviews — it’s a great way to find trusted solar installers UK wide

DIY Solar Kits – Best for Flexibility & Budget Control

If you enjoy hands-on projects or live off-grid, a DIY solar kit gives you more freedom and can cut costs significantly. Brands like Sunstore Solar offer pre-matched kits that are ready to go, making the process easier than ever.

Best for:

• Off-grid cabins, campervans, sheds, or garden rooms
• Garden offices or compact residential setups
• Confident DIYers who are comfortable with tools and basic wiring

What to consider:

• ⚠️ You’ll be responsible for setup and installation
• ⚠️ These systems may not qualify for Smart Export Guarantee unless installed by an MCS-certified professional
• ⚠️ You must follow UK safety regulations and wiring codes

Quick Checklist Before You Commit

• 🔍 Are you connected to the grid or living fully off-grid?
• 💷 What’s your setup budget — and future upgrade plan?
• 🛠️ Do you want to install it yourself, or have someone else handle it?
• 📈 Would you prefer a scalable setup or a complete system from day one?

Whether you go with a DIY kit or hire the best solar provider, the key is choosing a system that fits your goals. Some homeowners also explore the best power company for solar tariffs to get the most out of their investment.

Taking time to understand your needs upfront will help you avoid costly mistakes and choose a solar solution that delivers real value in the long run.

Bonus: Best Use Cases for DIY Solar Kits in the UK

DIY solar kits aren’t just a cost-effective option — they’re also one of the smartest choices for those looking to power their space with flexibility. Some of the best solar co options now make these kits incredibly beginner-friendly. Whether you’re topping up grid power or aiming to go fully independent, kits from trusted suppliers like Sunstore Solar make the process straightforward.

Let’s look at some of the most popular real-world scenarios where DIY solar really shines:

Off-Grid Cabins & Holiday Lodges

If you’re staying in a remote cabin or enjoying a holiday lodge, a DIY solar kit can provide reliable power for lights, appliances, and small heaters — all without needing a grid connection. These kits are quiet, easy to use, and scalable to suit seasonal needs.

Campervans & Vanlife Setups

Vanlifers value independence, and solar is a big part of that freedom. With a portable kit and a leisure battery, you can charge devices, run a mini fridge, and stay off-grid longer — all without needing a hook-up.

Garden Offices & Studios

With more people working from home, powering a garden office with solar is a smart move. It cuts your energy bills and eliminates the need to trail extension leads across your lawn. It’s ideal for workspaces, hobby studios, or reading nooks.

Sheds, Workshops & Allotments

Small off-grid kits are perfect for powering tools, lights, or battery charging stations in sheds or remote workshops. When a grid connection feels like overkill, solar makes it easy to get the job done.

Emergency Power Backups

Solar isn’t just for daily use — it’s a smart way to prepare for the unexpected. A compact solar setup with battery storage can keep the essentials running during blackouts or supply backup power when you need it most.

Need Help Choosing the Right DIY Kit?

Start with a trusted UK brand like Sunstore Solar. Their ready-made kits include everything you need — panels, batteries, inverters, and support to guide you through setup.

Sunstore’s reputation for quality, support, and user-friendly products has earned them some of the best solar power reviews in the UK — especially for off-grid and eco-conscious use. If you’re looking for trusted green solar technologies reviews, they’re a great place to start.

👉 Browse Sunstore Solar kits (Affiliate link)

FAQs – Solar in the UK: What You Need to Know

Can I Install Solar Panels Myself in the UK?

Yes — if you’re confident using tools and have some basic wiring knowledge, you can install solar panels yourself using a DIY kit. However, to qualify for Smart Export Guarantee payments or certain warranties, the system usually needs to be installed by an MCS-certified professional. DIY solar works especially well for off-grid cabins, campervans, sheds, and workshops.

What Are the Best Solar Kits for Beginners?

The easiest way to start is with pre-configured DIY kits from trusted UK suppliers like Sunstore Solar. These kits come with matched components, clear step-by-step instructions, and helpful support if you need it. They’re perfect for building confidence while staying safe. Some of the same brands trusted by those asking what’s the best solar company for full installs also offer simplified versions for DIY use.

Do DIY Solar Kits Qualify for VAT Exemption in the UK?

Typically, VAT relief only applies to systems installed by certified professionals in residential settings. Most DIY kits are subject to standard VAT rates. That said, you can still save money overall by installing the system yourself — especially for smaller or off-grid setups.

How Much Can I Save with Off-Grid Solar?

It depends on how much of your energy usage comes from your solar setup. For small off-grid systems — like those in cabins or vans — you could avoid 100% of your electricity bills. Even partial systems help cut costs and provide energy security during price hikes or power cuts.

Can I Power a Whole House with a DIY Kit?

Not usually. DIY kits are best suited for powering lights, small appliances, and electronics. If you’re looking to run an entire household or connect to the grid, a professionally installed system is the better route.

Curious about the world’s best solar energy companies or the best solar company to work for? We’ll be sharing a deeper dive in future guides.

Got a question we haven’t covered? Drop it in the comments or reach out directly — we’re always happy to help!

Final Thoughts – Choosing the Best UK Solar Solution in 2025

Whether you’re planning to go fully off-grid, cut your electricity bills, or take more control of your energy use, there’s a solar solution to match your goals.

Our Pick of the Top Five Solar Companies in the UK for 2025

Here’s our pick of the top five solar companies in the UK for 2025 — whether you’re going off-grid, adding battery storage, or seeking full-service installation:

• 🏡 Joju Solar – Best for full-service installs and community-focused projects
• ⚡ Deege Solar – A smart, well-rounded option for homes and businesses
• 🔋 Sunstore Solar – The top DIY choice for off-grid cabins, campervans, and garden projects
• 🏭 Geo Green Power – Ideal for commercial-scale systems with premium warranties

Each company brings something different to the table — from end-to-end support and high-tech features to affordable, self-install kits. The most important thing is to choose a setup that matches your lifestyle, budget, and long-term energy needs.

New to Solar? Start Simple

If you’re new to solar and want a low-pressure way to start, we recommend looking into DIY kits from Sunstore Solar. They’re affordable, easy to set up, and perfect for dipping your toes into renewable energy.

👉 Explore Sunstore Solar’s DIY kits (Affiliate link)

Related Reading

And if you’re based in North America, be sure to check out our related guide: 👉 Best Off-Grid Solar Systems in the USA

Still unsure who takes the crown as the best solar company Champion or Victory Mills of 2025? Keep an eye on our updates — we’ll be diving deeper into head-to-head comparisons soon.

Thanks for reading! Got a question or a solar story to share? Drop it in the comments or get in touch — we’d love to hear from you.