Solar panels are the smartest home upgrade you can make in London today. Energy bills are constantly rising, and more homeowners and business owners want an easy way to take control of their power costs. A good solar system does exactly that. It cuts your bills, reduces your carbon footprint and pays for itself many times over its 25-year lifespan.
The hard part is choosing the right installer. There are hundreds of solar companies in London and the quality varies greatly from one to the next. The right choice can save you thousands in the long run, while the wrong choice can lead to weak parts, poor design and slow support. This guide will take you through the top 10 solar panel installers in London for 2026, so you can choose with confidence.
Why Solar Panels Make Sense in London Right Now
2026 is one of the best years to fit solar panels in London. Costs continue to fall, incentives remain the same and payback times are shorter than ever. Here are the main reasons to take action now:
- 0% VAT until March 2027. The government is keeping VAT zero-rated on home solar systems, so you save around 20% on the total cost of a typical installation.
- Smart Export Guarantee payments. Any excess electricity you send back to the grid earns you money every month, reducing payments by around 7 to 10 years for most London homes.
- Falling panel and inverter prices. Global factory production continues to increase, so the cost per kilowatt falls every year. The cost of quality panels is now much lower than in 2020.
- Strong daylight levels in the capital. London gets more sunlight than most parts of the UK, so a good-sized system will cover a large part of your annual electricity use.
- Great match with heat pumps and EV chargers. Solar power powers your low-carbon heating and your electric car for next to nothing, so you create a clean energy setup for your entire home.
- Protection against price shocks. Wholesale electricity prices still fluctuate. Generating your own electricity gives you real cover against future increases.
Top 10 Solar Panel Installers in London
1. Prime Time Solar – Best Overall for Value, Quality, and Aftercare
Prime Time Solar tops this list by a clear margin. The company designs each system around your actual roof size, hours of sunlight and daily electricity usage, so you get real savings from day one, not a template quote that misses the mark. An in-house team of energy experts and professional installers handle everything from a free survey to the final switch-on, and a price-match promise means no competitor can undercut them on a like-for-like quote. Homeowners in Essex, Colchester, Chelmsford, and Basildon often appreciate the honest advice, tidy work and quick responses when questions arise months after installation. Here’s what puts Prime Time Solar at the top:
- Systems from just £3,495 – one of the most competitive entry prices in the market.
- 30-year panel warranty – far longer than the industry-standard 20 to 25 years.
- MCS accredited installer with RECC and EPVS backing, so you qualify for Smart Export Guarantee payments.
- Insurance-backed guarantee protects your investment even if unexpected issues appear.
- Price Match Guarantee – send a cheaper quote and Prime Time Solar beats it.
- Free bird proofing, free monitoring, and no deposit on finance plans.
- Excellent rating on Trustpilot with strong reviews from customers in Essex, Chelmsford, Colchester, Basildon, and beyond.
- Works with top brands including LG Solar, Enphase, SolarEdge, Tesla, Huawei, JA Solar, GivEnergy, JinkoSolar, and Trina Solar.
- Turnkey service covers solar panels, battery storage, EV chargers, inverters, and iBoost hot-water diverters under one roof.
Whether you want a small system for a terraced house or a full solar plus battery plus EV charger setup, Prime Time Solar provides a smooth process from first call to final handover.
2. Solar4Good
Based in Harrow, north-west London, Solar4Good stocks a wide range of solar panels from top brands. The team typically completes home installations within ten days and works well on both homes and businesses.
- Offers panels from JA Solar, Jinko, Trina Solar, and Qcells
- MCS certified with a 25-year system warranty
- Strong Trustpilot rating with over 600 reviews
3. The Solar Co.
Based in Bromley, south-east London, this small firm gets near-perfect ratings on major review sites. The director calls it a boutique agency that has carried out hundreds of installations across the capital.
- Fits Canadian Solar and JA Solar panels
- Uses batteries from Tesla, SolarEdge, and Sunsynk
- Which? Trusted Trader status adds a layer of buyer protection
4. Electrosmith
Electrosmith serves south London and has been doing so for over ten years. Reviewers often mention the friendly installation team and detailed initial consultation.
- Over a decade of local install experience
- Strong focus on customer education during the sales stage
- Founded and run by a long-serving electrician
5. Octopus Energy Services
Based in Westminster, this branch of Octopus started fitting rooftop solar in 2023 and now covers large parts of the UK. If they don’t install in your area, they’ll refer you to one of their trusted partners.
- Fits 450W JA Solar panels with Enphase and Tesla batteries
- Access to leading Smart Export Guarantee tariffs
- Backed by a major UK energy supplier
6. Sustainable Electrical Services
This small Kingston-based company relies entirely on engineers rather than a sales staff. Customers speak directly to experts who know the system inside out.
- No sales team – engineer-led process from start to finish
- Most work comes through word-of-mouth referrals
- Strong local reputation across south-west London
7. Joju Solar
Joju Solar is a well-known North London installer with strong experience in solar PV, battery storage and EV charging. The team works with homeowners, councils, schools and community projects.
- Long-standing presence in the UK renewable energy sector
- Handles both small home and large public sector projects
- Good option for buyers who want multi-technology advice
8. Acen Solar
Acen Solar focuses exclusively on London. The company fits solar panels, batteries and EV chargers for homes and small businesses.
- Deep local knowledge of tricky London roof types
- Handles Victorian terraces, flats above shops, and modern builds
- Strong aftercare and monitoring support
9. Geo Green Power
Geo Green Power sits at the premium end of the market with a near perfect Trustpilot rating. The firm focuses on quality over volume, so buyers get more personal attention.
- Perfect 5.0 Trustpilot rating from a smaller review base
- Suits buyers who want detailed advice on solar plus heat pumps
- Careful custom system design for each property
10. DCR London
DCR London manages both residential and commercial solar in the capital. Their focus is on hands-on project management and direct client contact.
- MCS and NICEIC accredited for full technical assurance
- Strong reviews for aftercare and fast response times
- Suits buyers who want a small, hands-on London firm
What to Look for in a Solar Panel Installer
Six checks separate the strong installers from the weak. Run each shortlisted company against this list before requesting a proposal, and you drastically reduce delivery risk.
- MCS certification is a must. It proves that the installer complies with UK quality regulations and allows you to claim Smart Export Guarantee payments. Non-MCS installs cannot earn export earnings.
- Real case studies. Ask for photos and details of projects like yours. A firm with a lot of housework won’t know how to design a large business system.
- Consumption-based design. A good installer will ask for half an hour of data from your smart meter before quoting, so the design matches your actual usage patterns.
- Fully itemised pricing. Panels, inverters, wiring, scaffolding, DNO fees and paperwork should all appear as separate lines. Lump-sum quotes often hide additional costs that appear later.
- Long-term aftercare. Remote monitoring and fast fault response make a big difference to the life of a 25-year system. Ask what will happen if the installer goes out of business.
- Future-proof design. If you can add a battery or EV charger later, ask for a hybrid inverter now. Retrofitting costs more than fitting the right kit up front.
A strong installer answers all of these questions with confidence and gives you time to think. A weak installer uses pressure and vague assurances to make a quick sale.
How Much Do Solar Panels Cost in London
The cost of solar panels in London varies depending on the size of the system, roof type and equipment selection. Here is a rough guide for 2026:
- Small home system (limited roof space): £5,000 to £7,500
- Medium home system (typical family home): £7,000 to £10,000
- Large home system (high electricity use): £10,000 to £14,000+
- Battery pack add-on: £3,000 to £8,000 depending on size and brand
- Commercial systems: Varies widely by roof size and design
Several other things also change the final price:
- Roof height and scaffolding access
- Tile type or flat roof mounting kit
- Shading and layout complexity
- Inverter brand and battery capacity
- Consumer unit upgrades
- Bird protection and monitoring equipment
Always compare prices for similar types from at least three installers before you decide. Prime Time Solar makes this easy with an instant online estimate tool and price match guarantee, so you’ll never pay more than you need to for the same specification.
Common Red Flags to Avoid
Some warning signs quickly appear when you compare quotes. Look out for these before signing anything:
- Very low prices. A price that is much lower than the market average often means cheap parts, poor design, or missing items like scaffolding. Cheap now often ends up being expensive later.
- Pushy sales tactics. Time-limited offers and pressure to sign on the spot are classic warning signs. A reputable firm welcomes questions and gives you time.
- Hidden or missing certifications. Any firm that hides its MCS status or doesn’t clearly display its credentials on its website is a real risk.
- Vague or lump-sum quotes. If the quote doesn’t break down parts, labor, scaffolding, and paperwork, you can’t properly compare.
- No physical roof survey. A serious installer visits your property before finalizing the design. Anyone who quotes from Google Maps alone should be left out.
- No workmanship warranty. A panel manufacturer warranty is not enough. You also need the installer’s own warranty on the fitting work itself.
Trust your gut. If something doesn’t feel right, walk away and get another quote.
Smart Export Guarantee And Extra Savings
The Smart Export Guarantee, or SEG, allows small solar owners to earn money for excess electricity sent to the grid. Once your panels produce more electricity than your home uses, the excess flows back to your energy supplier, who pays you at their SEG rate. Rates vary from supplier to supplier, so compare rates before signing up. To join the scheme, you need an MCS-certified installer and an export-enabled smart meter, both of which come as standard with Prime Time Solar installations. Home solar and battery jobs in the UK also receive 0% VAT under current rules, reducing the initial cost by around 20% compared to the standard rate. Ask your installer to confirm this on your quote before signing. VAT rules can change, so check the current government guidelines before booking any work.
Why Prime Time Solar Stands Out from the Rest
Every installer on this list has strengths, but Prime Time Solar wins on a combination of price, warranty length, aftercare and honest service. Here’s why many London homeowners choose them over rivals:
- Longest warranty in the market at 30 years, far ahead of the 20 to 25 years most rivals offer
- Lowest entry price at just £3,495, backed by a Price Match Guarantee
- Free extras worth over £1,000 including bird proofing, PV monitoring, and no-deposit finance
- In-house team from surveyor to installer to aftercare, so no work is passed to unknown subcontractors
- Full turnkey service – panels, inverters, batteries, EV chargers, optimisers, and iBoost all in one contract
- Trusted by real customers including sports figures, families, and businesses across London and the Home Counties
Final Thoughts
Solar panels are one of the best long-term investments a London homeowner or business can make today. The right installer can help you save more, worry less and enjoy clean power for decades. Compare at least three quotes before committing, check certificates and read real reviews. Focus on quality, integrity and strong aftercare over the cheapest price. A well-designed system pays for itself and then keeps on giving for another 15 to 20 years, making choosing an installer one of the most important decisions of the entire journey. With a free survey, instant online quote and the assurance of a 30-year warranty, Prime Time Solar remains the safest first call.
