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Electrical Contracting Companies in Cardiff: 416 Active Firms (2026)
Electrical contracting companies in Cardiff install, inspect and maintain wiring, power and safety systems across local buildings and infrastructure.
Buying activity tends to sit with estates teams, facilities managers, main contractors and property owners rather than individual consumers, with work scoped around project delivery, planned maintenance and statutory inspection cycles. Closest-fit suppliers look like lower-mid-market to mid-market contractors: local site teams, project managers, qualified electricians and back-office processes for certification, risk assessment and handover. Engagements are usually business-to-business, centred on building-level installations, facilities maintenance, testing programmes and infrastructure work. Sales cycles tend to be tender-led or relationship-led, with repeat work dependent on compliance records and the ability to staff sites reliably.
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Cardiff has 416 actively trading electrical contracting companies, with reported employment of 1,250 people across the cohort. Scale is uneven: 14 operators report turnover above £5M, while 89 were incorporated since 2022. That mix points to a market in which smaller site-led contractors sit alongside a thinner layer of lower-mid-market firms able to carry larger installation, testing and maintenance contracts. For researchers, the Cardiff picture looks less like a contractor market dominated by a handful of revenue-scale firms and more like a fragmented local supplier base serving buildings, facilities and infrastructure work.
For England-facing dwelling work, GOV.UK frames Approved Document P as statutory guidance for electrical safety, covering notification, design, installation, inspection, testing and handover information. Competent person schemes shape the market structure because registered installers can self-certify certain building work instead of seeking separate building regulations approval; electrical-scheme members also appear on the electrical competent person register. The Building Safety Regulator adds a broader oversight layer under the Building Safety Act, while ONS statistical treatment keeps electrical installation within construction-installation activity, close to the procurement budgets used by main contractors and facilities teams.
Cardiff's cohort appears likely to remain split between small owner-managed contractors and a narrower group with the management systems needed for repeat facilities, infrastructure and building-services work. Compliance pressure tends to favour firms that can evidence inspection, testing, certification and site governance without slowing delivery. Newer entrants may keep price competition visible at the simpler end of the market, while established contractors are more likely to compete on labour availability, documentation discipline and relationships with main contractors. Consolidation is plausible where succession issues or framework access make independent trading less attractive, but the sector still looks local and operationally hands-on rather than platform-led.
416
Active firms
2026
14
£5M+ turnover
Cardiff companies
89
Incorporated since 2022
Cardiff companies
Key facts
About 3% of the trading cohort reports turnover above £5M (14 of 416 firms) — the rest sits below that revenue band.
21% of the cohort was incorporated since 2022 (89 firms), so a sizeable share is in its first few filing cycles.
Building Regulations Part P covers electrical safety in dwellings in England, including notification of work and requirements for design, installation, inspection, testing and handover information.
Installers can use competent person schemes to self-certify certain building work instead of seeking separate building regulations approval.
Since April 2023, the Building Safety Regulator has had a duty under the Building Safety Act 2022 to keep building safety and standards under review in England.
The UK electricians market was estimated at £35.9 billion in 2024.
Top Cardiff Electrical Contracting companies
Orion TS Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance of electrical systems. Offers EICR inspections, structured cabling, commercial solar installations, EV charging…
Serves businesses, landlords, homeowners and public-sector organisations across South Wales and the UK, including retail, healthcare, education, HMO and commercial property clients.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Evans Electrical Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services including design, installation, testing and commissioning of electrical systems for construction projects. Also installs lighting, fire and security systems,…
Serves building contractors and property developers across Wales, the West and beyond, with clients in education, residential, commercial, healthcare, industrial, logistics, sports and leisure…
Financial Health
HealthyHealthy · Profitable · -6% CAGR over 2y
Location
ARC ELECTRICAL SYSTEMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical design, installation and maintenance for domestic, commercial and industrial properties. Offers inspection and testing, fire alarm and access control systems, solar PV…
Serves a mix of B2C, B2B and public-sector customers in South Wales, including homeowners, private customers, workplaces, landlords, letting agents, local authorities and small to medium industrial…
Financial Health
StrongStrong
Location
CJS Electrical (Wales) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation, maintenance and testing of electrical and data systems. Installs EV charging points, fire and security systems, and renewable…
Sells to households and business customers in Wales, including commercial and industrial sites. Serves homeowners, offices, factories and other premises needing electrical, data, fire and security,…
Financial Health
StrongStrong · Growing, Hiring · 3% CAGR over 4y
Location
Perc Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering and contracting services for rail and construction projects, including electrical design, installation, testing and commissioning, LV power and lighting systems,…
Serves B2B clients in the rail infrastructure and construction sectors across the UK, including commercial and industrial sites, depots and compounds, plus domestic customers for EV charger…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
SINCLAIR ELECTRICAL CARDIFF LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical services for residential, commercial and industrial properties, including electric vehicle charger installation, CCTV systems, electrical installation condition reports (EICR),…
Serves residential homeowners and landlords, plus commercial and industrial businesses in Cardiff and surrounding areas with property electrical and security requirements.
Financial Health
StableStable · -66% CAGR over 4y
Location
A J Crews & Co Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including electrical installations, inspection and testing, electrical cleaning, mechanical servicing, and specialist support for back‑up energy systems.…
Serves businesses, property owners and facilities managers with premises or projects requiring qualified electrical and mechanical technicians, including organisations needing back-up energy support.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
Location
CMB West Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering contracting services including mechanical and electrical installation, facilities management, maintenance, pre-construction support, cleanroom and process installation. Manages…
Serves B2B project owners, main contractors and facility managers across Wales and the UK, particularly in industrial, cleanroom, semiconductor, renewables and commercial facilities sectors.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
Focus MEP Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical, electrical and public health engineering services for building projects, including design and installation of heating, ventilation, water systems, lighting, power, fire alarms,…
Serves B2B and public-sector clients in commercial offices, healthcare, office fit-out, residential and education projects, including developers, contractors and building owners needing building…
Financial Health
StableStable · Hiring · 22% CAGR over 2y
Location
INFINITY PLYMOUTH LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation and maintenance of fire and security systems, CCTV, data cabling and fibre optic networks, and commercial electrical installations for…
Serves businesses across multiple sectors plus domestic customers, with buyers including fire and security firms, commercial property operators, shopping centres, power stations, MOD sites and large…
Financial Health
HealthyHealthy · -63% CAGR over 4y
Location
CMB Engineering
Provides engineering contracting services including mechanical and electrical installation, facilities management, cleanroom and process installation, pre‑construction support, and maintenance.…
Serves commercial and industrial organisations, contractors and project clients across Wales and the UK, particularly in facilities, cleanroom, semiconductor, renewables and process-led environments.
Location
AMSER RENEWABLES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable and energy‑efficient building systems, including solar photovoltaic and solar thermal systems, heat pumps, underfloor heating, biomass boilers, combined heat and power…
Serves businesses and organisations needing renewable and building services, including construction contractors, property developers, housing providers, education sites and public-sector clients,…
Financial Health
StrongStrong
Location
C&M Site Services Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical installation services for mechanical and engineering contractors, supporting projects in sectors such as rail infrastructure, commercial buildings, stadiums, utilities and…
Sells to businesses, particularly mechanical and engineering contractors, serving projects in the rail, commercial, stadium, utilities and custodial sectors across the UK.
Financial Health
DistressedDistressed · -18% CAGR over 2y
Location
GR GROUP SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and contracting services for building systems and interiors, including HVAC, electrical and plumbing installations, ceilings and walls, flooring, doors, EV charging…
Serves UK commercial and multi-site organisations, including retailers, builders’ merchants, veterinary practices, universities, shopping centres and contractors managing fit-out or facilities…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
BPS Facilities Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial property maintenance and engineering services, including plumbing, gas heating, boilers, air conditioning and ventilation, electrical installation and testing, roofing works, and…
Serves businesses, commercial property owners and industrial companies across Wales, South West England and the M4 Corridor, spanning varied sectors needing facilities and property support.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
FSE Group Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides fire, security and electrical services for residential and commercial properties, including installation and maintenance of fire alarms, fire extinguishers, intruder alarms, CCTV and access…
Serves homeowners, residential customers, community centres and small commercial property owners across Cardiff, South Wales and the South West of England.
Financial Health
StrongStrong · Hiring · 14% CAGR over 3y
Location
TP Pearson & Son Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
ELEQUIK LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
OAK ELECTRICAL INSTALLATIONS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
WeakWeak · 0% CAGR over 2y
Location
Portman Electronics Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and integrated communication and security systems including nurse call and dementia call systems, IP telephone systems, access control, CCTV, fire alarms, emergency lighting,…
Serves B2B customers in the UK care industry, particularly major care home providers and residential care facilities needing integrated building systems support.
Financial Health
StableStable · 0% CAGR over 4y
Location
PHILLIPS ELECTRICAL SOUTH WALES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic and commercial properties, including electrical installations, maintenance and repairs, inspection and testing of electrical systems, and…
Serves domestic and commercial customers across South and West Wales, including homeowners, businesses and larger organisations such as schools and hospitals, from small homes to large premises.
Financial Health
StableStable
Location
Nuvolt Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs commercial renewable energy systems including solar PV, battery storage and electric vehicle charging infrastructure. Provides consultancy, system design, installation and…
Serves UK businesses, commercial property operators, EPC contractors, and organisations with commercial, domestic or public charging facilities seeking low-carbon energy infrastructure.
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
Location
SOUTH WALES PROPERTY SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property maintenance and building services for domestic and commercial clients, including plumbing, electrical work, gas servicing, landscaping, property clearance, external cleaning,…
Serves domestic homeowners, landlords and commercial property owners/managers across the M4 Corridor and surrounding areas, from Pembrokeshire to Swindon.
Financial Health
StableStable
Location
T & B Electrical Solutions Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
BLUES FIRE & INTEGRATED SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of fire safety and security systems, including automatic fire detection, passive fire protection, disabled refuge alarms, intruder alarms, access…
Serves business and organisational customers needing fire, security and integrated building systems, including clients requiring electrical, fire safety, access control, CCTV and cabling services.
Financial Health
StrongStrong · Hiring · 57% CAGR over 4y
Location
Onco SES Ltd
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
L C Electrical (Cardiff) Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installation, maintenance and repair of electrical systems for residential and commercial properties, covering tasks such as wiring, lighting…
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
ARC MECHANICAL LTD
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Illumelec Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
CHAPMAN ELECTRICAL CARDIFF LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -67% CAGR over 5y
Location
CM Electrical (Cardiff) Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
WHITEHEAD BUILDING SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services including system design, installation, refurbishment and ongoing maintenance. Works on commercial, education, healthcare and industrial projects,…
Serves public and private sector building owners, developers and main contractors across South Wales and South West England, including education, healthcare, life sciences, distribution, student…
Financial Health
HealthyHealthy · -1% CAGR over 4y
Location
Lightning Solutions (Wales) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including installations, full rewires, electrical testing, compliance inspections, lighting upgrades, and power systems. Delivers reactive maintenance,…
Serves B2B and public-sector buyers, especially local authorities, housing associations, commercial businesses and industrial organisations. Targets contracted clients needing large-scale…
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
AMBERWELL MAINTENANCE SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical engineering services including design, supply, installation, testing and maintenance of building systems. Works on LV distribution, lighting, fire alarms, security…
Serves public sector and commercial clients in Wales, including NHS health boards, local authorities, education providers, offices, factories, warehouses and manufacturing facilities.
Financial Health
StableStable · 0% CAGR over 4y
Location
SOUTH WALES MAINTENANCE AND ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services for commercial and industrial clients, including site maintenance, machining and manufacture, pipework and ductwork, welding and fabrication,…
Serves B2B commercial and industrial organisations across South Wales and the UK, including facilities, construction and operations teams.
Financial Health
StableStable · -9% CAGR over 4y
Location
ARC Electrical Engineering Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering services including design, installation and maintenance for domestic, commercial and industrial systems. Conducts electrical inspection and testing, installs solar PV…
Serves domestic, commercial and industrial customers in South Wales, including local authorities, landlords, letting agents, private homeowners and workplaces.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
CAMELOT ELECTRICAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including electrical installations, maintenance, electrical installation condition reports, fire alarm systems, data and communications cabling, access…
Sells to businesses and organisations across the UK, particularly in social housing, commercial and industrial sectors. Serves buyers managing refurbishment, maintenance and installation projects,…
Financial Health
DistressedDistressed · -90% CAGR over 2y
Location
TOLLGATE ENGINEERING SERVICES LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides design, installation and maintenance of electrical and mechanical building services, including HVAC, gas, heating, ventilation, lighting, power distribution, and fire and security systems…
Serves commercial property developers, education and healthcare organisations, housing associations, PRS/student accommodation developers, and industrial clients including data centres, manufacturers…
Financial Health
StrongStrong · Growing, Hiring · 62% CAGR over 2y
Location
RIVERSIDE INDUSTRIAL EQUIPMENT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical engineering services for commercial facilities, including air conditioning, heating, plumbing, ventilation and steel fabrication, alongside electrical distribution,…
Serves businesses and public-sector organisations across South Wales and beyond, including industrial sites, large employers and estates/facilities teams needing mechanical, electrical and compliance…
Financial Health
StableStable · -2% CAGR over 2y
Location
SURGE ELECTRICAL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services including system design, installation, testing and maintenance. Services cover electrical installations, EICR inspections, EV charge point…
Serves commercial and industrial organisations across the UK, including education, healthcare, housing associations, facilities management, network operators, public sector bodies, retail, sport, and…
Financial Health
StrongStrong · Hiring · 6% CAGR over 4y
Location
WOODLAND BUILDING & ELECTRICAL SERVICES BARRY LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial electrical and building services, including electrical installation, maintenance and system upgrades for business premises, as well as MCS-certified solar panel and renewable…
Serves businesses of all sizes and commercial property clients across South Wales, including organisations needing building, electrical and renewable energy support for their premises.
Financial Health
WeakWeak · -7% CAGR over 3y
Location
DCI ELECTRICAL (WALES) LIMITED
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services including electrical design, installation, inspection and testing, commissioning, maintenance and repair, fire detection and alarm systems, CCTV and intruder…
Serves domestic customers, commercial businesses and industrial organisations, including property owners, facilities managers and project teams needing electrical engineering support.
Financial Health
StrongStrong
Location
Styles Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance of commercial and industrial electrical systems. Services include lighting and power installations, cable…
Sells to commercial and industrial businesses, including manufacturers, construction firms and other enterprises needing electrical services, as well as public sector clients such as local councils,…
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
I.S.T.L. Engineering Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical contracting services for construction projects, including installation of heating, plumbing, ventilation, air conditioning, power and lighting, fire alarms, CCTV,…
Serves B2B and public-sector clients in construction, commercial property, social housing, education, energy, healthcare, residential development and retail.
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 3y
Location
EFS Systems (Uk) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services for commercial, industrial and domestic clients, including installation and maintenance of solar PV systems, EV charging infrastructure, electrical…
Serves B2B, public-sector and residential customers: commercial and industrial premises, SMEs, NHS/hospital estates teams, organisations requiring security systems, and homeowners, with South Wales…
Financial Health
HealthyHealthy · -3% CAGR over 2y
Location
TUGBURY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of data and communications networks, including structured cabling and fibre optic systems. Also installs security and access control, air conditioning,…
Serves businesses of all sizes, commercial property owners and industrial sites across South Wales, including offices, manufacturing facilities, utilities, business parks and serviced workspace…
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
DEVELOPMENTS PLUS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for commercial and industrial clients, including electrical design, installation and maintenance. Also carries out high-voltage transformer work, lightning…
Serves B2B and public-sector clients across the UK, including light and heavy industrial sites, medical facilities, schools and colleges, food producers, commercial property owners, farms and offices.
Financial Health
HealthyHealthy · -67% CAGR over 4y
Location
Advanced Electrical Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic, commercial and industrial projects, including installation, maintenance and testing. Also designs and installs solar photovoltaic systems, fire…
Serves domestic customers, commercial organisations and industrial clients across South Wales and the UK, including companies with premises and project-based electrical, mechanical, fire-safety,…
Financial Health
StableStable · -4% CAGR over 4y
Location
LIGHTHOUSE ELECTRICAL (WALES) LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides electrical contracting services including installation of CCTV systems, fire and intruder alarms, and photovoltaic solar panels, alongside electrical work such as rewiring, fault finding,…
Serves domestic, commercial and industrial clients in South Wales, including homeowners and businesses needing electrical, security, fire alarm and solar-related installations.
Financial Health
DistressedDistressed · 0% CAGR over 3y
Location
CLEMENTS ELECTRICAL LTD
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
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How Cardiff Electrical Contracting companies work and how to sell to them
What they do
Cardiff electrical contractors typically make money through installation projects, fixed-price packages for testing and inspection, planned maintenance agreements and day works where fault-finding or reactive call-outs are harder to scope. Revenue is mostly service-led: labour, materials mark-up, certification and project management rather than a software or asset-rental model. Larger engagements tend to sit inside construction, refurbishment, facilities or infrastructure budgets, with margin affected by site access, subcontractor reliance, materials availability and retention terms. Smaller jobs may be quoted directly, while repeat commercial work often depends on framework places, approved-supplier status and the contractor's ability to provide paperwork at handover.
Who they sell to
Buyers are usually estates directors, facilities managers, main contractors, managing agents, property owners and public-sector procurement teams. Operational stakeholders care about response times, safe working, certification and disruption to occupied premises; finance and procurement teams care about day rates, materials pass-through, insurance, accreditations and contract terms. Typical commercial routes include tender portals, contractor frameworks, negotiated repeat work and referrals from building-services consultants. Sales cycles are short for reactive maintenance, longer for planned programmes and project packages, particularly where site surveys, method statements, risk assessments and pre-qualification checks sit ahead of award.
What they buy
Most electrical contracting firms tend to spend on job management, estimating, scheduling, mobile workforce, document control, finance, payroll and fleet administration systems. Compliance-heavy operators also buy tools and services for certification workflows, health and safety, training records, insurance, legal review and quality management. Recruitment, subcontractor management and apprentice pipelines matter because delivery capacity is tied to qualified labour rather than pure demand generation. Marketing spend is usually practical: local search visibility, tender support, case-study writing, signage and website maintenance. As firms move into larger commercial work, they are more likely to need project accounting, procurement controls and better reporting on site productivity.
Why and how to sell to them
Electrical contracting buyers tend to review suppliers when workload outgrows spreadsheets, a new framework or facilities contract raises reporting requirements, or leadership wants tighter control over margins and cash collection. Other triggers include adding project managers, moving from domestic and small commercial jobs into larger sites, taking on more maintenance clients, or preparing for inspection-led work where evidence packs matter. Outbound angles usually land better when tied to lost time on certificates, weak visibility of engineer utilisation, retentions, quote-to-invoice delays or the operational cost of rework.
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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Frequently asked questions
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