Top 15 Solar Panel Installers in London (2025)

The average medium-sized solar installation cost here in the UK The average medium-sized solar installation cost here in the UK ranges anywhere between £5,000 to £7000. For London, the numbers range from £7700 to £8500.  And the solar scene in the capital is replete with numerous installers vying for one’s attention. Such a horde of options can sometimes feel daunting. However, there are enough vexatious causes in life to trouble our minds. Going solar shouldn’t be one of them.

Here, we bring to you a list of the Top 15 Solar Panel Installers in London, based on various criteria like the range of products, prices, warranties and other factors.
So, let us begin!

  1. Solar4good UK Ltd

Solar4good UK Ltd offers efficient and competitive solar panels to the domestic market, at a reasonable rate and provides both residential and commercial installations.  They also offer Storage Batteries and EV Chargers in addition to Solar Panels. They aim to cut energy bills and make it easy for their clients to live sustainably.

  2. Project Solar

One of the most accredited and reliable solar installation companies in the UK, and have installed approximately 45,000 solar panels and batteries across the UK. They are known for offering a lifetime warranty on their panels and provide installation services for both residential and commercial scale projects employing the powerful 445W panels that offer great output even under low-light conditions.

  3. Callidus Solar

They are one of the leading purveyors and installers of commercial solar panels in the UK. They make an in-depth assessment of the site and client requirements before they undertake the installation. Additionally, they are known to charge no VAT and have undertaken high-power projects like a 500kW at the Leeks Department Store in Wales and Wiltshire.

  4. Evergreen Power

A US-based multinational company, Evergreen Power specializes in all kinds of sustainable energy solutions from solar to wind and battery storage solutions. They operate all across the UK. They enjoy a number of accreditations like Trustmark, BBA Certfied Installers, KIWA, etc., and are certified under the Green Deal and provide long term product as well as labour warranty.

 5. Greener Energy Group

Greener Energy Group, based in Scotland provides services across the UK. They are known to offer various financing options with some credit options available at zero interest. Besides this their installations have a 25-year warranty, and they also provide battery storage solutions along with solar panel installations.

 6. dh Solar Engineering

dh Solar Engineering is an England-based solar Engineering company known for its solutions, ranging from solar panel installations to solar thermals, biomass, air source heat pumps, etc. The founder, Daniel Holloway, has been working in the renewable power industry for 20 years and certainly knows his game. As a medium-sized company, they are known for their customer service and care for each client’s individual preferences.

 7. Diamond Green Energy:

A family-owned enterprise, started by a married couple in 2011, Diamond Green Energy has grown over the years and provides a range of solutions, from Boilers, Solar Panels, EV Chargers, Batteries, etc., Their interactive platform makes it very easy for you to get installations done, both at the commercial and residential scale. The first step involves filling out an online questionnaire that will provide you with the available packages, after which the installation process will be completed.

 8. Warma UK:

Warma-UK, which is a Cheshire-based installer that now operates all across the UK. It is a one-stop shop- providing solar panels, batteries as well as heating and insulation solutions. It is praised for its excellent customer service and its proactivity in getting you government grants which help cut your installation costs.

 9. Naked Solar

Two-time winner of the “National Solar PV Installer of the Year” in 2022, Naked Solar is known for its transparent pricing, superb after-sale services, and prompt services. They provide installations both for residential purposes as well as commercial level installations.

 10. Solar Century

Solar Century has been at the forefront of the solar industry for quite some time now and is one of the leading solar energy companies in the UK. They offer residential and commercial level installations and enjoy an edge in terms of industry experience(founded in 1998), making them a highly reliable and trusted choice.

 11. Everyone’s Energy UK

Everyone’s Energy UK offers the perfect transition to solar, at low costs by offering community-based installations under its partnership with Solar Together, a scheme that reduces individual costs by 30-35% Hence, it is the perfect match for people living in a flat or a block of houses, etc., It also offers an impressive variety of products- LG panels, SolarEdge and Lux Power inverters, etc., with a product warranty of 25 years. However, it only operates in London and South-East.

 12. Glow Green

Glow Green Pvt. Ltd. are unbeatable solar dealer providing excellent services with a warranty of 30 years on their solar panels and prompt services. They provide solar panel installation as well as battery storage solutions. They also enjoy NICEIC and HIES accreditation, thus being reliable and trustworthy.

 13. Heatable

Heatable offers REA Fusion panels, which are also suitable for low-light conditions and are ideal for houses and bungalows. Moreover, it offers a very interactive and easy-to-use user interface, wherein you can use their online quote tool for a bird eye’s view of your rooftop which would then be used to provide you with a quote! The prices range from £5,300 for around seven 440W panels with microinverters, they also provide storage battery options with some additional costs. They offer a standard product warranty of 25 years.

 14. Solar Fast

Solar Fast leads in terms of industry experience and customer service, having been in the industry for more than 2 decades, since 2006. It uses highly efficient 440W panels and also supplies solar storage batteries, along with installing panels. They have been highly lauded for their prompt and effective customer response system and offer a product warranty of 25 years.

 15. Solar Solutions UK

Last on our list is Solar Solutions UK offers a range of solar installation solutions ranging from Rooftop Solar, Ground Solar, and Sleeving Solar Tendering as well as storage and battery solutions. They are known for their holistic approach, and prompt services as well as decent product and labor warranties.

This was our list of the Top 15 solar panel installers in London, UK in 2025. these are some of the most reliable companies in the solar market that can ease up your transition to solar! Visit their websites, find quotes, and set out on a long and reliable path to a sustainable future.