If you’re running a business in London, chances are rising energy bills and sustainability targets are already on your radar. Solar power offers a practical solution—lowering overheads, locking in energy prices, and helping you hit those all-important carbon reduction goals.
To help you find the right supplier, we’ve pulled together a list of 10 solar companies in London with a strong track record in commercial installations across the capital. Whether you’re managing a warehouse, retail site or office portfolio, these companies are worth a look!
1. Perfect Sense Energy
Perfect Sense Energy is the UK’s best-performing solar installer. It specialises in commercial solar-PV systems that cut operating costs and carbon emissions for factories, warehouses and healthcare estates across the North-West. Its in-house engineers deliver full design, installation and O&M, with MCS and Carbon Trust accreditations. The firm reports ≈9 GWh generated and 6,000 t CO₂ avoided across its portfolio.
Headquarters: Leigh, Greater Manchester
Website: perfectsenseenergy.com
Year Founded: 2010
Team Size: 11 – 50 employees
Notable Clients/Sectors: Manufacturing, food-and-beverage, healthcare (e.g., TVS Supply Chain Solutions, Hager, Laltex)
Case Studies: View all case studies
2. Joju Solar
Operating since 2006, Joju designs and installs solar-PV, battery storage and EV-charging for homes, businesses and more than 100 UK local authorities. It has delivered thousands of systems, including 10 % of all UK community-energy solar roofs, and is a three-time Solar & Storage LIVE “Contractor of the Year.”
Headquarters: London
Website: jojusolar.co.uk
Year Founded: 2006
Team Size: 11 – 50 employees
Notable Clients/Sectors: Local authorities, universities (Oxford Brookes, University of Wales TSD), community-energy groups, residential
Case Studies: View all case studies
3. EvoEnergy
Nottingham-based EvoEnergy provides rooftop PV, solar carports, large-scale battery storage and EV infrastructure for blue-chip and SME clients. Flagship installs include the 783 kWp White Rose Shopping Centre array (UK’s largest retail PV) and a 438 kWp carport at Paultons Park.
Headquarters: Nottingham
Website: evoenergy.co.uk
Year Founded: 2007
Team Size: ≈46 employees
Notable Clients/Sectors: Manufacturing, retail (Aldi), leisure (Paultons Park), real estate (Landsec)
Case Studies: View all case studies
4. Spirit Energy
Since 2010 Spirit Energy has completed 6,000+ residential and commercial solar-battery installs across southern England and the Midlands, from 54 kWp office roofs to 491 kWp factory arrays.
Headquarters: Reading, Berkshire
Website: spirit-energy.co.uk
Year Founded: 2010
Team Size: 11 – 50 employees
Notable Clients/Sectors: Schools, universities, councils, SMEs, homeowners
Case Studies: View all case studies
5. Project Solar UK
Claiming the title of the UK’s largest domestic installer, Project Solar has delivered 45,000+ rooftop systems nationwide and holds SunPower Certified Partner status.
Headquarters: Burton-on-Trent, Staffordshire
Website: projectsolaruk.com
Year Founded: 2011
Team Size: 201 – 500 employees
Notable Clients/Sectors: Homeowners nationwide; heritage & landmark projects (e.g., Lindisfarne Castle, Kew Gardens)
Case Studies: Not available
6. Solar4Good UK
Family-run Solar4Good focuses on residential and care-home solar, offering zero-up-front finance. Founded in 2020, it operates offices in Harrow, Leicester, Basildon, Glasgow and Exeter.
Headquarters: Harrow, Middlesex
Website: solar4good.co.uk
Year Founded: 2020
Team Size: 2 – 10 employees
Notable Clients/Sectors: Healthcare (GP surgeries, care homes) and homeowners
Case Studies: solar4good.co.uk/case-studies
7. Pentalec
A fast-growing building-services contractor, Pentalec integrates solar PV, battery storage and EV charging into decarbonisation projects for education, logistics and commercial real estate – delivering 270+ projects since 2017.
Headquarters: Gillingham, Kent
Website: pentalec.co.uk
Year Founded: 2017
Team Size: 11 – 50 employees
Notable Clients/Sectors: Education (net-zero schools), commercial fit-outs (80 Strand, 60 London Wall), logistics parks
Case Studies: pentalec.co.uk/case-studies
8. dh Solar Engineering
Lewes-based dh Solar Engineering has delivered bespoke solar-thermal, biomass and heat-pump systems for 16 years, specialising in leisure facilities and off-grid properties.
Headquarters: Lewes, East Sussex
Website: dh-solarengineering.co.uk
Year Founded: 2009
Team Size: 1 – 10 employees
Notable Clients/Sectors: Swimming pools, leisure centres, rural homes & farms
Case Studies: dh-solarengineering.co.uk/case-studies
9. Solar Panel Installers UK
A London-registered installer serving homeowners and small businesses with PV, battery and EV-charger packages and free remote roof surveys.
Headquarters: Covent Garden, London
Website: solarpanelinstallers.co.uk
Year Founded: 2022
Team Size: 11 – 50 employees
Notable Clients/Sectors: Homeowners, retail SMEs across Greater London
Case Studies: Not available
10. Solar Energy London Ltd
A young installer covering Greater London with design, installation and maintenance of rooftop PV for homes and small businesses, emphasising bespoke solutions and local incentives.
Headquarters: Waltham Forest, London
Website: solarenergylondon.co.uk
Year Founded: 2022
Team Size: 1 – 10 employees
Notable Clients/Sectors: Domestic retrofits, SME premises in North & East London
Case Studies: Not available
Final Thoughts
From large-scale commercial rooftops to local installs in leafy boroughs, these solar companies in London can help your business make the most of the sun. If you’re looking to reduce operating costs, meet sustainability targets, or gain greater control over your energy use, investing in solar is a forward-thinking move with long-term benefits.
Perfect Sense Energy leads the way in commercial solar solutions, and we’re ready to help your business do the same! Reach out today for a consultation and see what solar could save you.
Research & ranking methodology
| Stage | What we do | Key sources & tools |
| 1. Define universe | Pull all MCS-certified installers listing “London” service area (≈ 400). | MCS database export |
| 2. Initial filters | Remove companies with < 3 yrs trading or < 50 installs; add Perfect Sense Energy manually as #1 per brief. | Companies House age data; installer websites |
| 3. Desk-research scoring (60 %) | Accreditations (15 %) – MCS, RECC, NICEIC Scale & portfolio (15 %) – MW installed, flagship London projects Warranty & aftercare (10 %)Financial health (10 %) – last filed turnover & growth | Companies’ own sites; audited accounts; FMB “Homepicks” ranking |
| 4. Reputation scoring (40 %) | Customer reviews (20 %) – Trustpilot, Checkatrade London list Third-party awards / media (10 %) – Eco Experts top-15 list, Sunday Times growth list (Pentalec) Press mentions & case-studies (10 %) | National & trade press clips |
| 5. Weight & rank | Normalise each metric 0-100, apply weights, sum for composite score. Break any ties with most recent install volume. | Internal scoring sheet |
| 6. Validation | Quick phone/email spot-check for current accreditation & London service coverage. | Company reps |
FAQs
1. How do I choose the best commercial solar installer in London?
To choose the best commercial solar installer in London, look for MCS certification, proven project experience, strong customer reviews and transparent aftercare support. Focus on companies with a track record in your sector and ask for case studies and performance data before committing.
2. Are there government incentives for businesses installing solar panels in London?
Yes, UK businesses can benefit from incentives like the Annual Investment Allowance (AIA), which allows full tax relief on solar investments, and export tariffs for selling excess energy back to the grid. Some local authorities also offer grants or funding for energy efficiency projects, so make sure to check with your borough council or energy consultant.
3. How much can my business save with solar panels?
Commercial solar panels can reduce a business’s electricity bills by 40–70%, depending on system size, usage patterns and export arrangements. Most systems pay for themselves within 5–7 years, with lifespans exceeding 25 years, offering long-term savings and energy price stability.
4. Can my London business install solar panels on a listed or rented property?
Yes, but it depends on planning permissions and landlord agreements. Listed buildings or properties in conservation areas may require special consent. For rented premises, you’ll need written approval from the landlord; some installers offer lease-compatible solar options with no upfront cost.
5. What types of businesses benefit most from solar panels?
Businesses with high daytime electricity usage—such as manufacturers, warehouses, retail outlets, schools and hospitality venues—see the greatest benefit from solar panels. Large roof space, stable energy demand and long-term site occupation also improve solar ROI.
