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Cleantech Companies in Leeds: 40+ Active Firms (2026)
Cleantech companies in Leeds develop low-carbon technologies, energy-efficiency services and environmental solutions for local and national buyers.
Buying centres tend to sit in estates, facilities, energy, sustainability, procurement and operations teams, rather than in a narrow technology function. Suppliers usually sell to commercial landlords, industrial operators, public-sector estates and infrastructure buyers, with propositions framed around lower energy use, emissions reduction, compliance evidence or resource efficiency. Engagements appear to range from site-level audits and installations to repeat maintenance work and framework-style contracts. The typical buyer is likely to care as much about delivery risk, payback evidence and ongoing support as about the underlying technology, which gives service-led firms a visible role alongside equipment and systems specialists.
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Leeds has 41 actively trading cleantech companies, giving the city a compact, project-led cohort. Reported headcount totals 450 people, consistent with businesses that combine technical design, installation, maintenance and advisory work. Only 2 firms have revenue above £5M, and 7 were incorporated since 2022, so the market still appears weighted towards small and mid-sized operators rather than a broad base of scaled employers. The commercial base is likely to be split between local estates buyers, industrial sites, public-sector customers and infrastructure work tied to decarbonisation or environmental performance.
Operating constraints tend to come from the end market rather than from a dedicated cleantech rulebook. Suppliers selling into public-sector estates must fit procurement, budget and assurance cycles; installers and environmental-services providers are often judged against safety, planning, technical certification and ongoing performance evidence. For industrial and infrastructure buyers, the sales process can involve site surveys, payback modelling, maintenance liabilities and evidence that emissions or resource-use claims can be audited. That makes the market less like pure software procurement and more like applied engineering, with sales cycles shaped by risk allocation as much as climate targets.
Leeds appears to have a practical cleantech base: local services, installation capacity and environmental-performance work sit closer to the centre than venture-style hardware bets. That should keep demand linked to the capital spending cycles of estates, councils, industrial sites and infrastructure operators. The smaller company profile also means consolidation can come through specialist contractors adding low-carbon capability, rather than through standalone platform winners. As buyers ask for evidence of savings, maintenance cover and compliance comfort, firms with repeatable delivery processes tend to look better placed than those relying on bespoke project work.
41
Active firms
2026
2
£5M-plus firms
Revenue threshold
7
Since 2022
New incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (2 of 41 firms) — the rest sits below that revenue band.
17% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Leeds cleantech firms work across low-carbon technologies, energy-efficiency services and environmental solutions for local and national buyers.
Customer demand appears linked to practical decarbonisation work: audits, equipment, software, services and operational changes.
Service operators, technology-led suppliers and project-based providers sit inside the same local cleantech label.
Top Leeds cleantech companies
1ENERGY Group Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy and project development services for district energy and low‑carbon heat networks. Conducts feasibility studies and supports the design, financing, construction and operation of…
Serves public- and private-sector organisations in UK cities and towns with significant heating demand, including local authorities, communities and large building operators pursuing net zero targets.
Financial Health
StableStable · Hiring · 104% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides metering hardware, IoT data collection systems and software for heat networks and district heating. Delivers installation, commissioning, maintenance and customer billing services, including…
Serves social housing providers, private landlords, managing agents, utilities, contractors, consultants and OEMs involved in communal or district heat networks and metering/billing operations.
Financial Health
StableStable · -65% CAGR over 4y
Location
Supplies 100% renewable electricity from wind and solar farms to industrial and commercial customers. Also installs commercial rooftop solar systems and offers power purchase agreements and energy…
Serves UK industrial and commercial businesses seeking renewable energy options, including companies with ESG, carbon reduction, supply-chain emissions or on-site solar generation goals.
Location
Hark Systems Ltd.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops cloud and edge energy management software for commercial and industrial buildings and assets. The platform connects to solar PV systems, batteries, generators, and meters to monitor…
Sells B2B to commercial and industrial enterprises managing buildings, estates and energy assets, including facilities managers, energy managers and asset operators with solar PV, storage,…
Financial Health
StrongStrong · Hiring · 33% CAGR over 2y
Location
Supplies renewable electricity to industrial and commercial customers using power generated from UK wind and solar farms. Also installs commercial rooftop solar systems and offers power purchase…
Serves UK industrial and commercial businesses seeking renewable energy supply, rooftop solar and carbon reduction support, particularly organisations with ESG, net-zero or supply-chain emissions…
Location
ZECO ENERGY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides energy management and efficiency services for businesses, using data analysis software to monitor utility consumption, identify savings, support regulatory compliance, manage utility…
Serves businesses and organisations with significant utility use, including academies, accountants, financial institutions, landlords, brokers, facilities management companies, installers, and…
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
Provides energy efficiency and renewable energy infrastructure projects, including solar, wind, biogas, energy storage and microgrids. Delivers design, construction, financing and operation of energy…
Serves UK public sector bodies and businesses, including councils, universities, healthcare facilities, retailers, commercial and industrial organisations, utilities, housing providers, data centres…
Location
Energiekontor UK Management Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, finances, constructs and operates onshore wind farms and solar energy projects. Manages renewable electricity generation assets and project lifecycles including site development, planning,…
Serves UK landowners with suitable sites for wind or solar development and corporate electricity buyers seeking renewable power through PPAs, alongside organisations involved in renewable energy…
Financial Health
StableStable · Hiring · 37% CAGR over 4y
Location
BH Energygap
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops and delivers commercial infrastructure projects focused on waste management and energy‑from‑waste facilities. Plans and manages recycling and waste treatment developments that convert…
Serves UK public-sector and commercial stakeholders involved in household and commercial waste management, alongside communities and partners connected to renewable energy-from-waste projects.
Financial Health
StableStable
Location
Simanalytica Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops decision intelligence software that integrates datasets, analytics, simulations and digital twins to support place‑based planning and infrastructure decisions. Platform connects and…
Serves local authorities, public-sector bodies and infrastructure or regeneration partners making place-based decisions on climate adaptation, net zero mobility, air quality, transport, carbon and…
Financial Health
StableStable · -5% CAGR over 4y
Location
POWER AND CONTROL INSTALLATIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs electrical and renewable energy systems for residential and commercial properties, including solar PV arrays, EV charging points, and energy‑efficient electrical infrastructure.…
Serves UK commercial clients, including offices, education providers and other organisations with high energy needs, alongside homeowners seeking residential energy upgrades.
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides cloud-based remote energy monitoring and smart meter reading system that collects and processes meter data for energy management, renewable generation monitoring, EV charging and billing.…
Serves renewable energy generators, commercial and industrial landlords, energy managers, EV charging operators, small businesses and private users needing remote meter data for monitoring, billing…
Financial Health
StableStable
Location
BH EnergyGap
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDevelops and delivers waste treatment and energy‑from‑waste projects that divert household and commercial waste from landfill. Plans and manages recycling facilities and renewable power generation…
Serves businesses and public-sector stakeholders involved in UK waste, recycling, energy-from-waste, and commercial development projects, including partners, developers, investors, and local…
Financial Health
DistressedDistressed · -54% CAGR over 6y
Location
ENTRUST SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides planning and environmental consultancy for energy and telecommunications infrastructure projects. Services include planning applications, ecology and landscape assessments, public…
Serves B2B developers, utilities and infrastructure operators in the UK and Ireland, especially energy, telecoms, renewables, grid, water, heat network and storage projects needing planning and…
Financial Health
StableStable · 0% CAGR over 2y
Location
Operates a wind farm generating renewable electricity from onshore wind turbines, supplying power to the grid and to commercial energy customers under renewable energy supply and power purchase…
Serves UK industrial and commercial businesses seeking renewable energy procurement, rooftop solar and PPAs, especially corporate energy buyers with carbon-neutral, ESG and supply-chain emissions…
Location
Energyfarm Narachan Ltd
Trajectory
1y · 2025–NowManages and operates a wind farm project, overseeing development, planning, construction and ongoing operation of onshore wind energy assets and electricity generation, including management of power…
Serves UK landowners with renewable energy development potential and corporate electricity buyers seeking power purchase agreements from onshore wind and solar projects.
Financial Health
Insufficient historyInsufficient history
Location
BH ENERGYGAP (DONCASTER) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops waste treatment and energy‑from‑waste projects that divert household and commercial waste from landfill. Plans and delivers recycling facilities and renewable energy generation projects…
Serves UK public and private sector organisations involved in household and commercial waste management, renewable energy generation and commercial development projects.
Financial Health
DistressedDistressed · -60% CAGR over 5y
Location
Smarta Energy Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides utility management and consultancy services for businesses, including electricity and gas procurement, energy market risk management, energy monitoring and metering, invoice validation and…
Sells to UK business energy consumers and public sector organisations, including schools, local authorities, housing associations, NHS and healthcare providers, emergency services, and government and…
Financial Health
StrongStrong
Location
Develops, finances, constructs and operates onshore wind and solar energy projects. Manages project planning, site development and electricity generation, and sells renewable power to corporate…
Serves UK landowners with potential renewable energy sites and corporate electricity buyers seeking power purchase agreements for wind farm output.
Location
Energyfarm Glenshimmeroch
Develops, finances, constructs and operates onshore wind and solar energy projects. Manages project planning, site development and power generation, and sells electricity from renewable assets…
Targets UK landowners with potential wind or solar sites, corporate energy buyers seeking renewable electricity through PPAs, and organisations investing in renewable energy projects.
Location
Energyfarm Cornharrow
Develops, finances, constructs and operates onshore wind and solar energy projects. Manages project planning, site development, electricity generation and power sales, including corporate power…
Serves UK landowners with potential wind or solar sites and corporate electricity buyers seeking power purchase agreements, plus organisations involved in renewable energy project partnerships.
Location
XEROGRID LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs off-grid solar power systems and battery storage for residential, agricultural and industrial sites, including standalone solar arrays, energy storage and related power…
Serves a mix of UK consumers and businesses, including homeowners, farms and agricultural operators, and industrial sites requiring off-grid power and battery storage.
Financial Health
WeakWeak · Hiring · 15% CAGR over 2y
Location
Biogreen Solutions Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation, maintenance and repair of heating systems for domestic and commercial properties, including biomass boilers, air source heat pumps, solar hot water systems and gas…
Serves both consumers and businesses across the UK, targeting homeowners and commercial property owners or managers with heating and renewable energy requirements.
Financial Health
DistressedDistressed · -9% CAGR over 2y
Location
Trajectory
1y · 2021–NowDevelops, finances, constructs and operates onshore wind and solar energy projects. Manages site planning, construction and operation of renewable power plants and sells generated electricity to…
Targets UK landowners with suitable landholdings and corporate electricity buyers seeking renewable power purchase agreements, including businesses sourcing power from wind and solar projects.
Financial Health
Insufficient historyInsufficient history
Location
Develops, finances, builds and operates onshore wind and solar energy projects. Manages renewable electricity generation and related infrastructure, and sells power to businesses through corporate…
Serves B2B energy buyers and landowners in the UK, targeting companies seeking corporate power purchase agreements for renewable electricity and landowners interested in assessing land for onshore…
Location
Energyfarm Hyndburn II
Develops, builds and operates onshore wind and solar energy projects. Activities include site identification, project planning, financing, construction and operational management of renewable power…
Serves UK landowners with suitable sites for wind or solar development and businesses seeking renewable electricity through corporate power purchase agreements, alongside organisations interested in…
Location
Trajectory
1y · 2021–NowDevelops, finances, builds and operates onshore wind and solar energy projects, including site planning, construction, electricity generation, and management of renewable power sold through power…
Sells to UK landowners seeking renewable energy development on their land and businesses interested in purchasing wind farm electricity via corporate power purchase agreements.
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
1y · 2021–NowDevelops, finances, builds and operates onshore wind and solar power projects. Manages planning, construction and operation of renewable energy sites and sells generated electricity through power…
Serves UK landowners with potential wind or solar sites and corporate electricity buyers seeking renewable power via PPAs, alongside buyers of wind and solar development projects.
Financial Health
Insufficient historyInsufficient history
Location
Develops, finances, builds and operates onshore wind and solar energy projects. Activities include site identification, planning and construction of renewable energy installations, operation of wind…
Serves UK landowners with suitable sites and corporate electricity buyers seeking renewable power via PPAs, alongside investors or project purchasers in onshore wind and solar developments.
Location
SSE
Serves businesses, households and public-sector energy users across the UK and Ireland, including large commercial and industrial customers, electricity network stakeholders, and energy market…
Location
FIRMA ENERGY VENTURES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops renewable energy projects, collaborating with landowners and local communities to bring clean power generation schemes forward. Focuses on project development, partnerships and technology to…
Serves UK landowners and local communities seeking to host or participate in renewable energy projects.
Financial Health
StrongStrong
Location
NEW POWER HOLDINGS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates a carbon credit verification and registry platform and develops carbon offset projects. Provides carbon footprint assessments, ISO 14064 training, ESG and carbon strategy advisory, and…
Sells to businesses, public sector bodies and governments seeking carbon credit verification, carbon accounting and sustainability support. Serves organisations running corporate sustainability…
Financial Health
StrongStrong
Location
Enviro-Leaf Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides environmental and social impact assessment consulting for energy, infrastructure and urban planning projects. Services include environmental impact assessments, life cycle assessments,…
Serves businesses and project developers in renewable energy, infrastructure and urban planning, including solar, hydropower and transmission line projects requiring environmental and social…
Financial Health
WeakWeak · -70% CAGR over 4y
Location
MONGOOSE ENERGY SUPPLY LIMITED
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsSupplies gas and electricity to businesses, offering fixed and flexible energy contracts, procurement services, renewable energy options, smart metering, and support for new connections, multi-site…
Serves UK businesses from small firms to medium, large and multi-site organisations, plus energy consultants, third-party intermediaries and affiliate partners managing commercial energy needs.
Financial Health
StableStable
Location
Hydro Renewables Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls air source heat pump systems and associated pipework for domestic and commercial buildings. Provides engineering services related to renewable heating systems, including system installation…
Serves domestic homeowners and commercial clients in Yorkshire and beyond seeking renewable energy and heat pump installation contractors.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
DUNCAN RENEWABLES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs commercial solar photovoltaic systems and renewable energy technologies for industrial, agricultural and commercial sites. Provides battery storage integration and operation and…
Sells to commercial and industrial businesses seeking solar PV, battery storage and renewable energy systems, particularly across agriculture, manufacturing, food, offices, hospitality and other…
Financial Health
StrongStrong
Location
Green Sustainable Energy Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering consultancy, design and project management for renewable and low‑carbon energy systems, including district heat networks, biomass, combined heat and power, heat pumps and solar.…
Serves public sector bodies, large utility companies and commercial organisations involved in renewable, low-carbon, decentralised energy, building efficiency and district heat network projects…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Process Energy Limited
Trajectory
1y · 2023–NowProvides industrial energy consultancy for manufacturing processes, including energy audits, consumption benchmarking, process optimisation, heat recovery system design and installation, and fuel…
Serves B2B manufacturing companies with energy-intensive thermal processes, particularly food, pulp and paper, metal, textiles and printing manufacturers pursuing efficiency and decarbonisation.
Financial Health
Insufficient historyInsufficient history
Location
Sol Group West Yorkshire Ltd
Trajectory
1y · 2025–NowDesigns and installs commercial solar photovoltaic systems for businesses and public sector organisations. Provides solar project planning, installation, operation and maintenance services, along…
Serves UK businesses and public sector organisations, including warehousing, logistics, manufacturing, construction, retail, hospitality, healthcare, education, farming and agriculture operators.
Financial Health
Insufficient historyInsufficient history
Location
U ENERGY (YORKSHIRE) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable energy and energy management systems, including solar PV generation, battery storage, EV charging infrastructure and LED lighting. Provides site analysis, system…
Serves B2B customers with commercial sites and high energy demand, particularly forecourts and data centres, plus organisations pursuing net zero or lower energy costs.
Financial Health
StableStable · Hiring · 13% CAGR over 2y
Location
SUPERIOR ECO LIGHTING SYSTEMS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs energy‑efficient LED lighting systems for commercial, education, industrial and warehousing facilities. Provides lighting audits, retrofit upgrades and financing options, and…
Serves UK schools, multi-academy trusts, colleges and commercial organisations in warehousing and industrial sectors, particularly facilities and estates teams responsible for premises energy…
Financial Health
HealthyHealthy · Hiring · 78% CAGR over 4y
Location
Q-GEN LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs ground source heat pump systems for commercial buildings, including care homes, hotels and large facilities. Provides bespoke borefield design, system integration and control…
Serves B2B owners, operators and developers of care homes, hotels and large commercial facilities, especially high-demand or regulated buildings needing lower-carbon heating and energy efficiency.
Financial Health
HealthyHealthy · -56% CAGR over 4y
Location
Hybrid Controls Solutions Ltd
Trajectory
3y · 2021–NowFinancial sub-scores
Computed from 3 filingsDesigns, installs and maintains building energy management and control systems for commercial facilities. Provides energy audits, metering solutions, variable speed drive installations, advanced…
Serves B2B organisations with commercial or industrial buildings, targeting facilities, energy and operations teams seeking to manage energy consumption, metering, controls and building systems.
Financial Health
StrongStrong · Growing, Hiring · 82% CAGR over 4y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops waste container sensors and a cloud-based analytics platform that monitors bin fill levels and collection events. Provides data, alerts, reporting, and route optimisation tools for waste…
Serves B2B and public-sector customers including waste services companies, small and large haulers, property managers, campus operators, and cities or municipalities responsible for collections,…
Financial Health
StrongStrong · Hiring · 14% CAGR over 3y
Location
ENERTECGREEN LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops biomass gasification technology for small‑scale energy generation. Designs compact 1–5 MW gasifier units that convert biomass into fuel gas for heat and power production, intended for…
Serves B2B customers in renewable energy, including biomass fuel source operators, green energy project developers and industrial energy consumers needing 1–5 MW-scale solutions.
Financial Health
WeakWeak · -58% CAGR over 4y
Location
Keep Energy Systems
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops long‑duration energy storage systems using compressed air and heat capture. Designs equipment that converts diesel engines into electrically driven compressors integrated with air and…
Sells to commercial and industrial customers needing resilient long-duration power, especially organisations operating in off-grid or weak-grid environments and businesses seeking local power system…
Financial Health
StrongStrong
Location
Omega Solutions Cross Hills Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides energy and sustainability consultancy, training, and software platforms focused on reducing energy consumption and carbon emissions. Offers building performance assessments, cloud-based…
Serves businesses seeking to cut energy use and carbon emissions, particularly organisations with buildings, BMS-connected assets and temperature-controlled environments, plus employee teams needing…
Financial Health
StrongStrong
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides maintenance, repair, overhaul and monitoring services for Endurance E‑Series and X‑Series wind turbines. Develops and installs upgrade components and repair solutions, and purchases used…
Serves UK owners and operators of Endurance E-Series and X-Series wind turbines, including customers left without manufacturer support for existing turbine assets.
Financial Health
StableStable · -51% CAGR over 4y
Location
DC21 (GROUP) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides maintenance, repair, overhaul and monitoring services for Endurance E Series and X Series wind turbines. Develops and installs upgrade components, refurbishes turbine parts, and purchases…
Serves owners and operators of Endurance E Series and X Series wind turbines across the UK, including businesses and landowners with operational turbines or assets they want to sell.
Financial Health
HealthyHealthy
Location
EARNSTONE DEVELOPMENTS (CASTLEFORD) LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDistributes Yutong buses, coaches and electric trucks; provides servicing, repairs and parts support for DAF and MAN commercial vehicles; supplies EV charging and energy storage systems, EV…
Serves B2B commercial vehicle operators, including bus, coach and electric truck fleets in the UK and Ireland, plus DAF and MAN vehicle owners, fleet maintenance teams, and automotive professionals…
Financial Health
WeakWeak
Location
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How Leeds cleantech companies work and how to sell to them
What they do
Leeds cleantech suppliers usually earn through a mix of project fees, equipment margin, consultancy, installation work, managed service contracts and maintenance retainers. Some sell physical systems, metering hardware or control equipment; others package audits, feasibility studies, monitoring and reporting into service-led engagements. Pricing often follows the risk profile of the site: a fixed-fee survey, a quoted installation, then support priced per asset, site or contract term. Where savings claims are central, buyers expect baselines, payback assumptions and responsibility for performance to be clear before sign-off. Cash flow can be lumpy because revenue follows capital projects, although maintenance and compliance work can create repeat income.
Who they sell to
Their customer base tends to be local and regional estates owners, manufacturers, logistics sites, housing providers, councils, universities and infrastructure operators. The internal sponsor is often a Head of Estates, Facilities Director, Energy Manager, Sustainability Lead, Operations Director, CFO or procurement team, with technical approval from engineering or health and safety staff. Smaller deals may come through direct relationships and referrals; larger public-sector or infrastructure work usually requires framework access, tenders, site visits and documented assurance. Sales cycles are therefore rarely purely online. Most buyers want a quantified business case, proof that installation will not disrupt operations, and clear aftercare before they commit budget.
What they buy
Most cleantech firms tend to spend on tools and services that make project delivery less manual: CRM, quoting, field-service management, job scheduling, fleet tracking, document control, project accounting and customer reporting. They may also need energy-modelling software, monitoring systems, data capture, cyber security, environmental compliance advice, technical certification support, insurance, legal review for installation contracts and specialist recruitment. Because many operate with small delivery teams, practical back-office gains often matter more than abstract change-management claims. Sellers should expect interest where a product reduces time spent on surveys, proposals, evidence packs, maintenance administration or grant and tender documentation.
Why and how to sell to them
Buying triggers tend to appear when a firm wins a repeat maintenance contract, moves from advisory work into installation, hires operations or finance leadership, bids for public-sector frameworks, or needs tighter evidence around carbon and savings claims. Revenue inflection can expose weak scheduling, stock control, margin tracking and cash collection; new tender activity can expose gaps in policies, certifications and case evidence. Outbound tends to work when it is anchored in delivery risk rather than climate rhetoric. A useful approach is to show how similar site-based businesses shorten surveys, reduce rework, manage subcontractors, protect margins or produce audit-ready customer reporting.
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.
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