TOP 10 BEST SOLAR INSTALLATION COMPANIES IN LONDON FOR HOMES AND SMES IN 2026

1. Solar4Good

Best for: All-round excellence across residential and commercial projects

Solar4Good has built a reputation that few competitors can match on sheer breadth and consistency. Operating as a nationwide, MCS-certified installer, the company handles everything from modest three-bedroom semi-detached rooftops to multi-site industrial deployments, and it does both with the same level of attention to detail. Every commercial project begins with analysis of the client's actual half-hourly consumption data rather than rough annual estimates, which means the system design is tailored to real usage patterns from the outset.

The numbers tell the story of a company that has earned its standing. Solar4Good holds a 4.9-star rating on Trustpilot from more than 750 verified reviews, with 92 per cent of those awarding five stars. It scores 9.7 out of 10 on Checkatrade. Earlier this year, it was named FMB Best Solar Installer 2026, a recognition that carries weight because the Federation of Master Builders evaluates workmanship standards, not just marketing reach. The company works with established panel brands including Jinko, Trina, JA Solar, and Aiko, and pairs them with inverters and battery systems from GivEnergy, Fox ESS, Sigenergy, and Tesla. Quotes are fully itemised, warranties extend to 25 years on panels, and there is no pressure selling.

2. Sunsave

Best for: Homeowners who want solar with no upfront cost

Sunsave has carved a distinctive niche as the only top-rated installer in London to offer a genuine solar subscription model. Sunsave Plus allows homeowners to get a fully installed solar and battery system for a fixed monthly fee with no upfront capital expenditure, which removes the single biggest barrier to adoption for many households. The subscription includes 24/7 monitoring, maintenance, a free battery upgrade, a free inverter replacement if needed, and downtime cover, all bundled under the Sunsave Guarantee that runs for twenty years.

Beyond the subscription model, Sunsave's credentials are robust. It is MCS-certified, accredited by RECC, approved by TrustMark, registered with NAPIT, and holds Which? Trusted Trader status. Customer satisfaction scores sit at 96 per cent based on its own verified feedback database. The company has been reviewed extensively by independent assessors who found its equipment, installation standards, and aftercare to be consistently among the best in the country.

3. Octopus Energy Solar

Best for: Homeowners who want solar fully integrated with smart energy tariffs

Octopus Energy needs little introduction. With roughly eight million UK energy customers and a 4.8-star Trustpilot rating, the brand carries more consumer trust than almost any other name in British energy. Its solar division leverages that infrastructure to offer a service that competitors struggle to replicate: an end-to-end package that combines panel installation with proprietary smart tariffs designed to maximise the financial return on every unit of electricity generated.

The headline offering is the Flux tariff, which pays up to 29 pence per kilowatt-hour for electricity exported during peak hours between four and seven in the evening, while providing cheaper overnight import rates for battery charging. Homeowners with a battery can effectively arbitrage the spread, earning an additional three hundred and fifty to four hundred and fifty pounds per year on top of self-consumption savings. All installations use JA Solar panels at around 21 per cent efficiency, carry 25-year warranties, and are completed by MCS-certified in-house teams. Residential installations currently qualify for zero per cent VAT through to March 2027.

4. Geo Green Power

Best for: Commercial clients and SMEs requiring large-scale, bespoke installations

Established in 2010, Geo Green Power has spent over fourteen years building one of the most credible track records in London's commercial solar sector. The company installs between 1.5 and 2 megawatts of solar capacity every month, working with blue-chip clients including Mercedes-Benz, Smeg, JCB, and Kingspan. It recently completed a multi-site rollout for Jemca, one of Britain's largest Toyota and Lexus dealerships, delivering 272 kilowatts of capacity across three London-area sites that generate approximately 250,000 kilowatt-hours of clean electricity annually.

What sets Geo Green Power apart for SMEs is the consultative approach. The team maps energy consumption patterns before producing a design, and the company offers both self-funded and fully funded solutions. On the domestic side, Geo Green recently consolidated its residential offering around SunPower panels and SolarEdge inverters, positioning its home installations at the premium end of the market. With over seventy staff and offices in the South and Midlands, it offers consistent coverage across every London postcode.

5. Joju Solar

Best for: Technically complex projects including listed buildings, schools, and community schemes

Few solar companies in the UK can claim the academic pedigree of Joju Solar, co-founded in 2006 by entrepreneur Joe Michaels and Oxford University renewables lecturer Chris Jardine. That technical heritage runs through everything the company does. Joju holds the distinction of being the UK's longest continuously MCS-accredited renewable energy installer, and it has won Contractor of the Year at the Solar and Storage LIVE Awards as well as EV Charge Point Contractor of the Year at the EVIEs Awards on three separate occasions.

Joju's London portfolio includes installations on Grade II listed churches, housing developments, schools, and community buildings. It is one of the few installers genuinely comfortable navigating the planning constraints of conservation areas and heritage properties, where standard bolt-on systems are not permitted. The company also has deep experience with community energy schemes, social enterprises, and public sector contracts, making it an ideal partner for organisations where the project involves multiple stakeholders and regulatory layers.

6. The Solar Co.

Best for: Residential customers in South London and the Home Counties seeking a personal service

The Solar Co. is among the highest-rated residential installers operating in London, combining MCS and Flexi-Orb certification with RECC accreditation and a consistently strong review profile. Where it distinguishes itself from larger national operators is in the personal nature of the service. Customers routinely praise the clarity of communication from initial enquiry through to post-installation support, and the company invests heavily in ensuring that homeowners understand exactly how their system works and what returns they can expect.

The Solar Co. covers London and the surrounding southern counties, installing a range of high-efficiency panels paired with inverters and battery storage from reputable manufacturers. For homeowners who find the prospect of dealing with a large corporate installer impersonal, this is a company that delivers professional-grade systems with a consultative, relationship-driven approach.

7. Eden Sustainable

Best for: SMEs and commercial clients seeking funded solar solutions with zero upfront cost

Eden Sustainable occupies a unique position in London's commercial solar landscape. Founded in 2014 and now wholly owned by AMPYR Distributed Energy, a major global renewables fund, Eden is a certified B Corporation and one of the UK's most established developers of commercial and industrial solar solutions. The backing of a global funder means that Eden can offer fully financed installations where businesses pay nothing upfront and begin saving on electricity from day one, typically reducing costs by 30 to 40 per cent.

This funding model is particularly attractive to SMEs that want to improve their sustainability credentials and reduce operating costs but lack the capital for an outright purchase. Eden's projects span retail, manufacturing, logistics, and office properties across London and beyond. Its B Corp certification signals a commitment to verified social and environmental standards that goes beyond the typical green marketing many installers trade on.

8. Efficient Home Energy Ltd

Best for: London homeowners who value outstanding customer service from a local installer

Among the London-based installers assessed on verified review platforms, Efficient Home Energy Ltd consistently ranks at or near the top. The company holds one of the highest TrustScores in the capital, with a rating of 4.9 on Trustpilot alongside excellent Google ratings, all drawn from a genuine, growing base of verified customers. It is MCS-certified and registered with NAPIT, ensuring that every installation qualifies for SEG payments and available grant schemes.

Efficient Home Energy operates as a genuinely local business, and that proximity translates into responsive aftercare and accountability that larger, dispersed operations sometimes struggle to match. For London homeowners who want to deal with a company rooted in their community rather than a remote call centre, this installer deserves serious consideration.

9. Perfect Sense Energy

Best for: Businesses that need detailed financial modelling before committing to solar

Perfect Sense Energy takes a consultancy-first approach that sets it apart from installers that lead with equipment specifications and pricing. The company invests significant time upfront mapping out a client's energy consumption profile, modelling payback periods, and calculating self-consumption rates before any system design work begins. For business owners and financial directors who need to see a clear investment case before signing off, this methodical approach builds confidence.

Serving London and the South East, Perfect Sense Energy works primarily with commercial and SME clients who want clarity and transparency on the numbers before they commit. Its MCS certification ensures compliance with all relevant standards, and clients benefit from detailed, data-driven proposals that make the financial case for solar tangible and verifiable.

10. Electrosmith

Best for: Residential customers seeking a highly accredited, quality-focused local installer

Electrosmith rounds out this list as a London-based installer that punches well above its weight on accreditation depth. The company holds MCS certification, NICEIC registration, TrustMark approval, and strong verified customer ratings on Google. It is the kind of installer that quality-conscious homeowners gravitate towards when they want reassurance that every aspect of the work, from electrical compliance to roof mounting, meets the highest professional standards.

As a local operator, Electrosmith brings the responsiveness and personal accountability that larger companies can lack. The company covers residential solar installations, battery storage, and EV charging across London postcodes, and its reviews consistently highlight the professionalism of its installation teams and the quality of post-installation support.