Turn this list into pipeline.
Solar Installation Companies in London: 100+ Active Firms (2026)
Solar installation companies in London design, fit and maintain photovoltaic systems for homes, landlords and commercial properties across the capital.
Buying decisions tend to sit with property owners, landlords, facilities teams and contractors rather than a dedicated energy buyer. The London market spans domestic retrofit, multi-property landlord programmes and commercial rooftop work, so engagements range from survey-led household jobs to planned building-portfolio rollouts. More developed operators carry design, electrical installation, project management and maintenance inside the same business; smaller crews often specialise around surveys, installation labour or aftercare. Demand is mostly business-to-business and property-led, with consumer work still present where owner-occupiers are upgrading rooftops for energy-cost management.
Read more
London has 187 actively trading solar installation companies, making the local cohort more of a specialist installer market than a broad renewable-energy universe. Reported employment totals 891 people, pointing to many owner-managed or crew-based operators alongside employers with wider borough coverage. The capital's building mix matters: dense rooftops, leasehold properties and commercial estates create different sales cycles, survey requirements and maintenance expectations, so installer capacity is as much about coordination and accreditation as panel supply.
Operating constraints sit at the junction of building work, electrical contracting and consumer/property sales rather than a dedicated solar-installation rulebook. Installers selling into London housing stock must account for roof condition, landlord permissions, conservation restrictions and connection processes before a project can convert from enquiry to installation. Commercial jobs tend to add procurement checks, health-and-safety documentation and post-installation service obligations. That structure favours firms able to coordinate survey, installation and maintenance; it also leaves room for specialist subcontractors where demand is fragmented across boroughs and building types.
Near-term development appears likely to be incremental rather than spectacular. The cohort has a visible base of small installation businesses, and scale appears to depend on repeat landlord, facilities and commercial-property demand rather than ad hoc domestic enquiries alone. Margin pressure tends to come from labour availability, equipment procurement and the coordination costs of working across dense urban sites. Consolidation may continue where larger contractors want survey capacity, maintenance revenue and borough-level coverage, but the market still looks suited to specialist local operators with known electrical crews.
187
Active firms
2026
15
Over £5M
Companies above the threshold
30
Since 2022
Recent incorporations
Key facts
About 8% of the trading cohort reports turnover above £5M (15 of 187 firms) — the rest sits below that revenue band.
16% of the cohort was incorporated since 2022 (30 firms), so a sizeable share is in its first few filing cycles.
Solar installation in London sits between property services, electrical contracting and distributed energy, so firms can be hard to classify in a single sector bucket.
Work is split across retrofit projects, new-build schemes, maintenance contracts and commercial premises rather than one utility-style procurement channel.
Buyer groups include homeowners, landlords and commercial property owners, each with different sales cycles and aftercare requirements.
Delivery models appear to mix in-house electrical work with subcontracted installation capacity across the capital.
Top London solar installation companies
Ample Energy Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains solar photovoltaic (PV) and solar thermal systems for electricity generation, heating and hot water. Provides system diagnostics, repairs, arc fault detection and…
Serves main contractors, architects and M&E companies, alongside domestic and leisure customers such as homeowners, rural properties, holiday cabins and caravan owners, mainly in Kent, London,…
Financial Health
StableStable · -24% CAGR over 4y
Location
Ingham Renewables Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsInstalls solar photovoltaic systems, battery storage and electric vehicle charging points for residential and commercial properties. Provides system design, supply and installation of renewable…
Serves UK homeowners, commercial property owners, businesses and electric vehicle owners seeking renewable energy systems for residential and business premises.
Financial Health
WeakWeak
Location
EIGHTCUBE SOLUTIONS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical design and build services for residential and commercial properties, including system planning, installation and maintenance. Also installs EV charging points, solar power…
Serves domestic and commercial property clients in London, including homeowners, businesses, developers, contractors and interior designers involved in new builds, renovations and upgrades.
Financial Health
HealthyHealthy · Hiring · 29% CAGR over 2y
Location
GLOBAL GREEN PARTNERS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable energy systems for residential and commercial properties, including solar PV panels, battery storage, air source heat pumps and EV charging points. Also provides solar…
Serves residential homeowners and commercial property customers across England and Wales seeking renewable energy upgrades, maintenance, and support for existing systems.
Financial Health
HealthyHealthy · -10% CAGR over 2y
Location
Thermal Guardian Solar
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls solar photovoltaic systems for residential and commercial properties. Provides system design, installation, maintenance and monitoring services, battery energy storage solutions, and energy…
Serves homeowners, businesses and community organisations seeking residential and commercial solar energy solutions, battery storage, maintenance and energy consultancy.
Financial Health
DistressedDistressed · -13% CAGR over 2y
Location
WAYRE HOUSE ELECTRICAL SERVICES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for residential and commercial properties, including EV charger installation, solar PV and battery storage systems, house rewiring, fuse board upgrades,…
Serves homeowners and businesses in Bromley, Kent and London, including commercial sites, schools and warehouses needing electrical, EV charging, solar, fire, security or data-related work.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 5y
Location
Silvercrest Energy Group Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs commercial solar photovoltaic systems for businesses and institutions. Provides battery storage integration, power purchase agreement financing, and ongoing operations,…
Serves commercial and industrial businesses, property developers, councils, NHS estates, schools and universities, with emphasis on organisations in the Midlands and South East seeking large-scale…
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 5y
Location
GGRS Energie Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, repair and maintenance of solar photovoltaic systems for residential and commercial properties. Services include fitting solar panels, batteries and inverters, system upgrades,…
Serves homeowners and businesses across the UK seeking domestic or commercial solar PV systems, battery storage, inverter replacements, and maintenance, including customers with existing solar…
Financial Health
WeakWeak
Location
B SOLAR UK LTD
Trajectory
1y · 2025–NowInstalls solar photovoltaic systems for residential and commercial properties, including roof‑mounted solar panels, battery storage systems, and EV charging points. Provides system design, supply,…
Serves residential homeowners and commercial property owners seeking solar energy, battery storage and EV charging installations across Essex and England.
Financial Health
Insufficient historyInsufficient history
Location
The Ecoglow Group Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing, heating and electrical services for domestic and commercial properties, including boiler work, gas services and emergency leak repairs. Installs renewable energy systems such as…
Serves homeowners, landlords and commercial clients in London, Surrey, Kent and Sussex, plus UK energy providers, councils and housing associations involved in decarbonisation programmes.
Financial Health
HealthyHealthy · -5% CAGR over 4y
Location
DIGITAL POWER UK LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsInstalls renewable energy and energy‑efficiency systems for residential and commercial properties, including solar PV panels, battery storage systems, heat pumps, solar thermal systems, and…
Serves homeowners, small business proprietors, self-builders, property developers, architects and consultants with domestic and commercial projects across the south of England.
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
Provides consultancy, development and installation of commercial solar PV systems for businesses, including roof‑mounted and ground‑mounted arrays, solar carports, battery storage and EV charging…
Sells to UK businesses, especially owners, tenants and landlords of commercial or industrial buildings seeking funded or self-funded solar, EV charging and battery projects. Serves sectors including…
Financial Health
Insufficient historyInsufficient history
Location
ENERGY SOLUTION ESSEX LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs renewable energy systems for residential and commercial properties, including solar photovoltaic panels, battery storage, EV charging points, heat pumps and insulation, and…
Serves residential homeowners and commercial organisations looking to reduce energy bills and emissions, including buyers seeking financed clean energy upgrades.
Financial Health
DistressedDistressed
Location
DEON ENERGY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and installs solar power systems for commercial and industrial clients. Provides engineering, procurement and construction (EPC) services, solar plant design, rooftop and ground‑mounted…
Serves businesses and institutions buying commercial solar projects, including rooftop and ground-mounted installations. Targets organisations seeking EPC and O&M support for solar plants, and also…
Financial Health
DistressedDistressed · -32% CAGR over 4y
Location
Abbotts Mechanical and Electrical Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical services including wiring, lighting installation, electrical repairs and maintenance, heating system installation and upgrades, solar PV and air source heat pump…
Serves domestic and commercial property customers, including homeowners, landlords and businesses, across London, Hertfordshire and Essex with building energy, heating and electrical requirements.
Financial Health
HealthyHealthy · -8% CAGR over 4y
Location
Blu-Lite Electrical Services Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides domestic and commercial electrical services including wiring installations, fault finding, repairs, electrical testing and inspections. Also installs EV charging points, solar PV systems,…
Serves homeowners, landlords, property managers, renovation and new-build clients, and commercial businesses across Kent, Bromley, Orpington, Croydon and South East London.
Financial Health
DistressedDistressed · -6% CAGR over 2y
Location
RAILTON RENEWABLE ENERGY LIMITED
Trajectory
5y · 2020–NowProvides solar energy system installation for residential and commercial properties, including rooftop and ground‑mounted solar panels, battery storage systems, and related energy solutions such as…
Serves homeowners, business owners and landowners seeking solar and battery energy systems, with offerings for domestic properties, commercial premises and ground-mount installations.
Financial Health
Insufficient historyInsufficient history
Location
WALLOP RENEWABLES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDesigns and installs solar photovoltaic systems for residential and commercial properties, including rooftop, ground-mounted and car park canopy installations. Also supplies battery storage systems…
Serves UK homeowners, businesses and landowners with commercial sites, car parks or ground space, plus property developers needing Part L solar packages.
Financial Health
StableStable · -31% CAGR over 3y
Location
COMFORT ELECTRICAL LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance for residential, commercial and industrial projects. Also installs and maintains solar photovoltaic systems and…
Serves residential homeowners, property developers and landlords, with a focus on high-end apartments, plus commercial and industrial organisations needing electrical contractors in Ealing, West…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
Solar4good UK Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsInstalls solar photovoltaic systems for residential and commercial properties. Services include design and installation of solar panels, battery storage systems, and EV chargers, supplying on-site…
Serves UK homeowners and commercial/public-sector property owners, including warehouses, schools, medical centres, farms, local councils, manufacturers, food businesses, care homes, hotels, logistics…
Financial Health
StableStable · 0% CAGR over 3y
Location
S R LEITCH LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsInstalls solar energy systems for residential and commercial properties, including solar panels, solar roof tiles, battery storage, inverters, and EV charging points. Provides system design, supply,…
Serves residential homeowners and commercial property owners across the UK and Channel Islands seeking solar, battery storage and EV charging installations.
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
Location
Pyramid Solution South East Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides home energy retrofit services including insulation installation, ventilation systems, solar PV, heat pumps, batteries and EV chargers. Also advises homeowners, landlords and housing…
Serves homeowners, private landlords, housing associations and local authorities in London and the South East, including property owners seeking funding support and social housing providers upgrading…
Financial Health
HealthyHealthy · Hiring · 56% CAGR over 2y
Location
TARVEN ELECTRICAL CONTRACTORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs solar photovoltaic systems, battery storage and electric vehicle charging points for residential and commercial properties. Provides consultation, site surveys, system…
Serves homeowners and businesses in Kent seeking solar, battery storage and EV charging solutions, including property owners aiming to reduce energy bills and businesses focused on operating costs…
Financial Health
StrongStrong · Hiring · 12% CAGR over 4y
Location
JOJU SOLAR LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs solar photovoltaic systems, battery storage and electric vehicle charging infrastructure for residential, commercial and public sector clients. Provides system components,…
Sells to UK homeowners, businesses and public sector organisations seeking solar, battery storage and EV charging, including offices, factories, warehouses, farms, schools, councils, universities,…
Financial Health
StableStable
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, funds, installs and manages renewable energy systems for commercial and industrial sites, including solar PV, battery storage and electric vehicle charging infrastructure, providing fully…
Serves commercial and industrial businesses seeking funded renewable energy projects, including organisations with sites suitable for solar, energy storage, EV charging, or roof refurbishment.
Financial Health
StrongStrong · Hiring · 23% CAGR over 2y
Location
FOREUK LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsInstalls solar photovoltaic systems, electric vehicle charging points, and electrical consumer units for residential and commercial properties. Provides system design, supply, and installation of EV…
Serves UK homeowners, families and business premises looking to reduce energy costs, adopt clean energy and upgrade electrics, with a strong emphasis on domestic customers.
Financial Health
StrongStrong · Hiring · 58% CAGR over 2y
Location
Trajectory
1y · 2025–NowDesigns and installs solar energy systems for homes and businesses, including solar PV panels, hybrid inverters, battery storage and electric vehicle chargers, with monitoring and energy management…
Serves UK homeowners, residential EV owners, businesses with commercial premises, and property developers seeking solar energy and EV charging solutions.
Financial Health
Insufficient historyInsufficient history
Location
EXPOLL LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides electrical contracting services for residential, commercial, and public sector projects, including electrical design and cost planning, EV charging point installation, LED lighting upgrades,…
Serves homeowners, commercial property owners, businesses, and public sector organisations, with emphasis on residential and commercial projects, public sector developments, and large-scale…
Financial Health
WeakWeak
Location
Code Electrical Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsInstalls solar photovoltaic systems, battery storage units and electric vehicle charging points, and provides electrical and mechanical installation services for residential, commercial and…
Serves residential homeowners, commercial property owners and industrial clients needing accredited electrical and mechanical contractors for energy and installation projects.
Financial Health
StrongStrong · Growing, Hiring · 25% CAGR over 5y
Location
AES Smart Metering Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides installation and maintenance of renewable energy and electrical systems including solar panels, battery storage, heat pumps, EV charging infrastructure and smart metering. Also delivers…
Serves UK homeowners and businesses seeking renewable energy installations, plus commercial clients needing metering, smart services, and public or private EV charging infrastructure.
Financial Health
StableStable · Profitable, Hiring · 21% CAGR over 3y
Location
Evergreen Power Uk Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsInstalls solar photovoltaic systems and battery storage for residential and commercial properties. Also supplies and installs heat pumps, air conditioning units, EV charging points and ventilation…
Serves UK homeowners, landlords and commercial property owners, plus trade buyers seeking Dyness and Pytes battery distribution.
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
AJR (UK) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides heating, plumbing and electrical services for domestic and commercial properties, including boiler installation, servicing and maintenance, central heating system design, electrical testing…
Serves homeowners and domestic property owners across Essex, alongside commercial property clients and Domestic & General insurance customers in the SS postcode.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
OTHER ENERGY SOLUTIONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsInstalls solar photovoltaic panel systems, battery storage and electric vehicle chargers for residential properties. Provides surveys, system design and installation of solar COMBI systems that…
Serves property-owning homeowners seeking lower utility bills, reduced reliance on energy suppliers, and income from exporting electricity to the National Grid.
Financial Health
StableStable
Location
DX CELLS TECHNOLOGIES CO., (UK) LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops and delivers renewable energy and energy management solutions, including solar PV systems, battery energy storage, EV charging infrastructure, grid balancing projects, and smart lighting,…
Serves businesses and consumers, including utilities, industrial and commercial energy users, urban infrastructure and public-space operators, communities, homeowners and EV owners.
Financial Health
WeakWeak · Hiring · 26% CAGR over 3y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies renewable electricity tariffs and provides home energy technologies including solar panel and battery systems, heat pump installations, and electric vehicle charger installations, along with…
Serves UK households, homeowners, EV drivers and businesses seeking renewable energy tariffs, low-carbon home upgrades and export options for solar generation.
Financial Health
StableStable · 0% CAGR over 4y
Location
A C J ELECTRICAL SERVICES LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for commercial, residential and industrial clients, including electrical design, installation, testing and maintenance. Installs EV charging points and solar…
Serves homeowners and commercial, industrial and public-sector organisations across the UK, including retailers, leisure venues, councils and charities requiring electrical contractor support.
Financial Health
DistressedDistressed · -18% CAGR over 3y
Location
FUS3 ELECTRICAL LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including wiring installation, rewiring, repairs and maintenance, and electrical inspections and certification. Also installs fire alarms, emergency lighting,…
Serves a mix of B2B, public sector and domestic customers in London, with key client segments in housing, commercial property and retail.
Financial Health
StrongStrong · Growing, Hiring · 58% CAGR over 2y
Location
TRIFORM ELECTRICAL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering and contracting services including electrical installations, mains distribution and switchgear, solar PV and EV charger installation, inspection and testing, PAT…
Serves commercial, industrial and residential customers across London and the South East, including industrial estates, restaurants, pubs, landlords, homeowners and organisations with maintenance…
Financial Health
StrongStrong · Hiring · 28% CAGR over 4y
Location
GREENLIGHT ELECTRICAL LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and management of renewable energy systems for commercial clients, including solar PV panels, battery storage, electric vehicle charging points and air source heat…
Serves UK businesses and commercial property operators, including care homes, logistics companies, apartment blocks, sports complexes and resorts, seeking renewable energy and decarbonisation…
Financial Health
StrongStrong · 0% CAGR over 1y
Location
DJM Electrical Services Limited
Provides electrical contracting services including installation, maintenance and upgrades of electrical systems for domestic, commercial and industrial properties. Also installs renewable energy…
Serves homeowners and commercial or industrial organisations needing electrical, renewable energy and EV charging support in Kenley, Croydon, Caterham, Coulsdon and nearby areas.
Financial Health
Insufficient historyInsufficient history
Location
DM ENERGY LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial solar energy installation services, including roof-mounted, ground-mounted and floating solar PV systems. Delivers turnkey projects covering panel installation, battery storage…
Serves UK businesses and commercial property owners, plus solar developers, designers, consultants and sustainability teams involved in large-scale projects for rooftops, ground sites, reservoirs and…
Financial Health
StableStable · -6% CAGR over 3y
Location
K2 MANAGEMENT RENEWABLES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs renewable energy and building energy systems for commercial and domestic premises, including solar photovoltaic and thermal systems, battery storage, heat pumps, electric…
Serves UK end users and businesses, including commercial property owners, main contractors, architects, engineering consultants, education bodies, managing agents and blue-chip clients.
Financial Health
StableStable · -66% CAGR over 4y
Location
Kempson & Co Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical design, installation, testing, commissioning and maintenance for commercial, industrial and high-end domestic properties. Services include power distribution, lighting systems,…
Serves commercial and industrial clients, plus owners and managers of high-end domestic, listed and non-standard properties, mainly in London and the Home Counties; also works with heritage and…
Financial Health
WeakWeak
Location
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and finances onsite renewable energy systems, primarily solar, for commercial and institutional customers. Structures power purchase agreements and manages the development, installation and…
Serves B2B and public-sector organisations, including businesses, local authorities, hospitals, schools and universities, places of worship, data centres, cold chain operators and ports.
Financial Health
StableStable · -75% CAGR over 1y
Location
Sunsave UK Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides residential solar panel and battery systems, offering installation and financing through a monthly subscription model. Includes system monitoring, maintenance, insurance and replacement…
Serves UK homeowners and households, especially family homes seeking lower energy bills and a financed route to residential solar and battery ownership, including those considering EVs or heat pumps.
Financial Health
DistressedDistressed
Location
Raytell Electrical Co. Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including design, installation and maintenance of electrical systems, security systems, solar PV, battery storage and EV infrastructure, working on social…
Serves local authorities, social housing providers, public sector estates, building contractors and facilities managers responsible for schools, housing, heritage buildings, warehouses and commercial…
Financial Health
StableStable · -5% CAGR over 2y
Location
YASAPO ENGINEERING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including wiring, consumer unit and fuse box replacement, emergency fault repairs, lighting installation and rewiring, solar PV installation, smart home and…
Serves homeowners, landlords and businesses in London, including domestic, commercial and industrial premises with emergency, maintenance and installation requirements.
Financial Health
HealthyHealthy · Hiring · 50% CAGR over 5y
Location
EVP Electrical Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation, maintenance and inspection of electrical systems for residential and commercial properties. Offers EICR certification, EV charge point…
Serves residential homeowners, commercial premises and industrial clients across London and surrounding areas, including customers needing qualified electricians for property electrical work,…
Financial Health
WeakWeak · Hiring · 26% CAGR over 4y
Location
Warmpro Insulation Specialists Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides decarbonisation and retrofit services for residential housing, including retrofit consultancy, design and planning, insulation installation, solar PV and battery systems, renewable heating…
Serves housing providers, housing associations and local authorities across the UK managing occupied residential estates and social housing stock, with buyers responsible for retrofit, asset…
Financial Health
DistressedDistressed
Location
COMMERCIAL & INDUSTRIAL LIGHTING SOLUTIONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs energy efficiency systems for buildings, including LED lighting, smart lighting controls, solar PV, and sustainable heating technologies. Provides consultancy, design, and funded…
Serves education providers, NHS and healthcare estates, public sector building owners, commercial property operators, leisure facilities, and industrial/distribution sites.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 5y
Location
Unlock all 187 leads
Showing 50 of 187 — +137 more with verified decision-maker contacts, live data, and CRM sync.
How London solar installation companies work and how to sell to them
What they do
London solar installation firms make money through quoted project work, combining equipment supply, electrical labour, design, survey and installation management. Domestic retrofit is usually priced as a fixed job after a site visit, while commercial rooftop and landlord work tends to involve staged proposals, deposits, milestone payments and handover documentation. Some operators add recurring revenue through monitoring, maintenance, fault callouts and performance checks, but installation margin still carries much of the business. The service shape is mixed: physical equipment procurement, skilled trades, site coordination and paperwork, rather than software or advisory work alone.
Who they sell to
Typical buyers are property owners, landlords, managing agents, facilities managers, building contractors and, on domestic jobs, owner-occupiers. Commercial opportunities often sit with estates, finance, procurement or sustainability roles, but the practical decision still depends on roof access, tenant consent and electrical feasibility. Smaller jobs are usually won through direct enquiry, local referral or installer quotation. Larger property portfolios and commercial buildings more often involve tendering, contractor panels or procurement checks. Sales cycles lengthen when permissions, roof works, energy modelling or internal capital approval are needed before an installation date can be set.
What they buy
Most solar installation firms tend to spend on tools that reduce quoting errors, crew downtime and document chasing. Relevant categories include CRM, field-service scheduling, job costing, proposal generation, stock control, fleet management, finance systems and customer support software. Project-heavy operators may also need health-and-safety services, insurance advice, contract review, accounting support and subcontractor management. Hiring support is often relevant where firms add electrical crews or move from domestic work into commercial rooftop delivery. Monitoring, maintenance workflow and service-ticket systems can fit operators trying to turn one-off installations into repeat aftercare revenue.
Why and how to sell to them
Solar installation buyers tend to evaluate suppliers when operational strain becomes visible: survey backlogs, missed installation dates, margin leakage, materials delays or rising aftercare workload. Triggers include winning landlord programmes, expanding across more London boroughs, adding installation crews, bringing maintenance in-house or bidding for larger commercial rooftop jobs. Outbound messages usually work better when tied to a specific bottleneck rather than general sustainability demand. Useful angles include faster survey-to-quote conversion, tighter job costing, cleaner handover packs, easier subcontractor coordination, fewer repeat site visits and better visibility of maintenance obligations after completion.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in London
Related directories
Frequently asked questions
How many solar installation companies are there in the London?↓
What counts as a solar installation company in this list?↓
Which are the largest solar installation companies in the London?↓
What do solar installation companies in the London actually do?↓
How does London solar installation compare internationally?↓
How is this list built and how fresh is the data?↓
How big are the typical solar installation companies in the London?↓
Are these mostly new or established solar installation companies?↓
What SIC codes does this use?↓
What buying signals should I look for?↓
Push these 187 companies into your pipeline.
Find the right decision-makers, see verified company data, and export your list in seconds.