Best Solar Panel Installers in the UK: Top 10 Expert Picks

Rising energy costs have made solar panels popular in the UK in the last decade. But solar panel cost can be a hurdle. Finding a quality installer with fair prices, strong warranties, and efficient panels is key. This guide compares the best solar panel installers in the UK, giving you a clear overview of the top 10 companies and what they offer.

However, if you’re looking to compare prices directly without contacting multiple companies or spending hours on research, we can help. Just fill in the quick 30-second form, and we’ll send you up to 4 free non-commitment quotes from our network of solar panel installers in your area. 

If you’re a homeowner looking to switch to solar energy, we’ve researched the top 10 solar companies in the UK in 2025 based on price, warranties, panel quality, and reviews.

Project Solar UK, Octopus Energy, and Solar4Good stand out for premium panels, flexible pricing, quick installations and high customer review ratings. The table below presents an overview of all the companies we’ve chosen.

With over 400 solar panel companies in the UK, narrowing down the best options can be overwhelming. 

That’s why we’ve selected these top 10 based on accreditation, high customer reviews, warranties, and services they offer that add value for you. 

Below, we break down what makes them the best solar panel installers in the UK. 

Octopus Energy is one of the top 10 solar companies in the UK, providing low-cost solar panels. They use a smart pricing system that charges less when more renewable energy (wind and solar) is produced.

Octopus Energy installs only 440W panels, which capture more sunlight, convert 22% into usable electricity and create more savings. Their solar panel packages are affordable, with prices starting at £5,170 for a 2-panel system and £10,000 for a 10-panel system with a 5kWh battery. 

If you’re wondering, “How many solar panels do I need?” you can see our guide that covers this topic. 

If you want solar panel installers with affordable pricing, smart energy plans, and battery storage, Octopus Energy is a strong contender for lowering your electricity bills. 

Project Solar UK is one of the UK’s largest solar panel installers and has been in the industry since 2011. They offer high-performing panels like the Evolution Titan 445W (21.4% efficiency) and SunPower Maxeon 390W (22.1% efficiency). Both come with a real-time monitoring system that lets you track your energy savings via a smartphone app. 

If you want one of the best solar panel installers in the UK with high-efficiency solar panels and a lifetime panel guarantee, Project Solar UK is worth considering. 

Heatable installs REA Fusion Energy bifacial solar panels, which capture sunlight from both sides to produce more power, even in cloudy weather. 

These durable double-glazed panels use advanced M10 Topcon N-Type solar cells for improved efficiency and work with Enphase micro-inverters for safer energy conversion. 

Heatable’s online system lets you instantly check prices, so you know what to expect before speaking with an agent. Learn more about types of solar panels to compare efficiency and performance.

If you live in an area where your home doesn’t get full sun all day, Heatable’s low-light solar panels are a great choice for getting more out of your solar energy. 

Solar4Good specialises in quick solar panel installations, which are often completed within 10 days. They offer three customisable packages for residential homeowners, so you can choose the best fit for efficiency, aesthetics, and budget. 

Solar4Good also offers a price-matching guarantee and has a wide range of solar panel brands, including JA Solar, Jinko, Trina Solar, Qcells, Fox ESS and more.

If you want solar panels installed quickly with various panel choices, Solar4Good is one of the best solar panel installers in the UK. 

Kimble Solar, a family-run business, focuses on bespoke solar systems, where they design systems based on roof shape, shading, and energy needs so you can get the most out of your PV system. Their personalised approach helps you get the best energy output and increased savings on a long-term basis. 

If you’re looking to incorporate solar panels into your home’s design, Kimble Solar is a good choice to handle your solar and design needs. Learn more about solar panel systems and how custom setups can increase your energy savings.

Solar Fast, founded in 2006, is one of the most experienced solar panel specialist companies in the UK. They focus on a full-service solution, installing only high-performance 440W M10-series solar panels up to 22.7% and integrated battery storage, which boosts electricity output and lowers electricity bills to almost zero.

If you’re looking for solar power companies that provide reliable long-term energy for your home, Solar Fast is a strong choice. 

Sunsave offers a pay-monthly solar subscription service that lets you install solar panels with no upfront costs. Their fixed-payment plans lock in a set price for 12 months at a time, so you pay the same each month even if the energy prices rise. The subscription service also includes servicing and maintenance, so you don’t have to worry about unexpected costs. 

If you don’t have the money to invest in a large upfront payment, Sunsave Solar’s subscription model is a great option for monthly hassle-free payments.

Glow Green is one of the UK’s best options for high-efficiency solar panel installation. Their low prices (starting from £5,000 for a 4kW system), flexible solar panel financing options (Fixed 12.9% APR loans ), and additional upgrades like battery storage and heat pumps make them a great choice for homeowners in the UK. 

If budget is a concern, Grow Green offers cheap solar panels and flexible payment plans to help you reduce large upfront costs. 

Cahill Renewable, established in 2013, is a highly rated solar panel installer in the UK, known for its honest service and professional approach. 

The company relies on recommendations and word-of-mouth instead of sales tactics, which says a lot about the “customer-first” experience. Their 10-year labour warranty is one of the longest in the renewable energy industry. With a 25-year product warranty on panels, you can count on long-lasting solar panels with strong energy output for decades. 

If you prioritise how a solar company treats you from start to finish, Cahill Renewables is a strong choice for customer service and long-term warranties. 

Effective Home, established in 2016, is a local solar panel installer operating primarily in England. They install solar panels, battery storage, insulation and heat pumps and help homeowners access government-backed solar panel grants like ECO4, and other grant schemes like the Great British Insulation Scheme. Their services include monthly financing options and an upcoming solar subscription if you’re looking to switch to solar without the high upfront cost. 

If you’re looking for a full-service approach, Effective Home offers solar with insulation or heating upgrades. 

Finding the best local solar panel installers takes research, and with all the companies we’ve covered, it’s important to compare prices, warranties, installation services and financing options. 

However, you might still wonder, are solar panels worth it? Especially when uncertain about technical details like solar panel sizes and how many you need.

Instead of spending hours comparing installers, you can get up to 4 free non-commitment quotes from our network of accredited solar companies in your area. Compare pricing, warranties, and services to find the best deal, hassle-free. 

Fill in the quick 30-second form to get started.