Electrical Contracting Companies in London: 4,838 Active Firms (2026)
Electrical contracting companies install, inspect, test and maintain electrical systems for buildings and infrastructure across London.
Buying decisions tend to sit with building owners, principal contractors, managing agents, facilities-management teams and public-sector estates functions rather than end users. Work ranges from call-out maintenance and periodic inspection to design-and-install packages on construction sites, with evidence of competent electricians, supervisors, project managers and compliance staff usually mattering as much as price. Residential specialists need a different sales motion from contractors serving commercial premises or infrastructure-adjacent sites: the former lean on notification, certification and local availability; the latter are judged on repeat delivery, documentation discipline and capacity to coordinate with other trades across London boroughs.
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London has 4,838 actively trading electrical contracting companies, making it a sizeable local contractor base rather than a short list of scaled building-services groups. Reported employment totals 1,607 people, which points to a market where many firms are small even where project work is technically complex. The commercial mix appears split between residential compliance work, commercial premises, construction installation packages and maintenance for property portfolios. Turnover scale is uneven: a small group clears the larger-company threshold, while most operators look closer to owner-managed contractors or specialist subcontractors serving borough-level demand.
Dwelling work is the most clearly framed regulatory area. Building Regulations Part P in England covers electrical safety in dwellings, while GOV.UK’s Approved Document P guidance addresses when work must be notified and what is expected on design, installation, inspection, testing and information handover. Contractors can use competent person schemes to self-certify certain building work rather than seeking separate building regulations approval, and electrical-scheme members appear in the electrical competent person register. For larger projects, building safety scrutiny now sits alongside conventional construction procurement, with the Building Safety Regulator keeping building safety and standards under review in England.
Fragmentation looks likely to persist, because local maintenance work and dwelling compliance can sustain small teams without requiring the systems of a large contractor. At the same time, buyers managing commercial estates appear to be placing more weight on audit trails, certification quality and coordination with wider building-safety duties. That favours firms able to combine trade labour with administrative discipline. Consolidation may occur around contractors with repeat property-management relationships, but the sector tends to resist clean roll-up stories: labour availability, borough-level relationships and liability for signed-off work all keep operating models quite local.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
4,838
Active firms
2026
56
£5M+ firms
turnover above £5M
1,203
New incorporations
since 2022
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Key facts
About 1% of the trading cohort reports turnover above £5M (56 of 4,838 firms) — the rest sits below that revenue band.
24% of the cohort was incorporated since 2022 (1,203 firms), so a sizeable share is in its first few filing cycles.
Residential electrical work in England is covered by Building Regulations Part P, with GOV.UK guidance covering notification, design, installation, inspection, testing and information requirements.
Competent person scheme membership lets registered installers 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 valued at £35.9 billion in 2024.
Top London Electrical Contracting companies
Financial sub-scores
Computed from 2 filingsProvides electrical contracting and engineering services for construction and facilities projects, including design, installation and commissioning of electrical systems, low‑voltage infrastructure,…
Sells to businesses and organisations in the industrial, commercial, residential and public sectors, including facilities teams, developers and operators of mission-critical sites, data centres and…
Financial Health
HealthyHealthy · Hiring · 100% CAGR over 1y
Location
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Computed from 5 filingsProvides mechanical and electrical building services contracting, including design and installation of electrical, mechanical and renewable energy systems. Works on residential, commercial,…
Serves property developers, main contractors and construction clients delivering residential, commercial, healthcare, education and maintenance projects, including new-build developments and…
Financial Health
WeakWeak · -72% CAGR over 4y
Location
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Computed from 5 filingsProvides electrical and mechanical contracting services including design, installation, testing and maintenance. Works on new infrastructure, refurbishments and upgrades for commercial buildings…
Serves businesses and public sector organisations in commercial, retail, education, hospitality, finance, transport and healthcare sectors, mainly across Greater London and the South East.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
Location
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Computed from 3 filingsProvides electrical contracting services for domestic and commercial properties, including full and partial rewires, electrical installations, fire alarm systems, emergency lighting, PAT testing,…
Serves local authorities, social housing providers, landlords, public buildings, commercial organisations and domestic homeowners across London and surrounding areas.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
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Computed from 5 filingsProvides electrical contracting services including design, supply, installation and testing of electrical systems for domestic, commercial and industrial projects. Undertakes large installations such…
Serves B2B and B2C customers across domestic, commercial and industrial sectors, including airport clients at Heathrow and Gatwick, department stores, shopping centres and organisations with secure…
Financial Health
WeakWeak · Hiring · 12% CAGR over 4y
Location
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Computed from 5 filingsProvides commercial and residential electrical services including installations, office fit‑outs, inspections and EICRs, PAT testing, lighting and lighting controls, data and telephone cabling,…
Serves construction firms, facilities managers, education and healthcare organisations, corporate clients, estate agents, and residential customers across London and the South of England.
Financial Health
HealthyHealthy · -75% CAGR over 4y
Location
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Computed from 5 filingsProvides electrical contracting services including installation, upgrades and maintenance for commercial buildings, education facilities, residential developments and data centres. Works on…
Serves public sector bodies, universities, data centre operators, technology firms, industrial sites and commercial property clients.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
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Computed from 2 filingsProvides mechanical and electrical building services for commercial and public sector properties, including installation, maintenance, compliance, breakdown repairs, plant replacement, and renewable…
Serves blue-chip companies, local authorities and commercial property operators across London and the Home Counties, including offices, housing providers, health and medical facilities, education…
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides electrical contracting services including design, installation, maintenance and testing of electrical systems. Also installs and integrates automatic opening vent (AOV) smoke ventilation…
Serves B2B and public-sector buyers, including commercial property owners, local authorities and housing associations managing social housing and refurbishment programmes across Essex, London and…
Financial Health
StableStable · 2% CAGR over 4y
Location
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Computed from 4 filingsProvides electrical contracting services including design and installation for domestic, commercial and industrial projects. Delivers new-build and fit‑out electrical systems, lighting, fire alarms,…
Serves construction contractors, developers, commercial fit-out clients, industrial sites, education-sector projects and some domestic customers, mainly within the M25, Home Counties and wider…
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 3y
Location
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Computed from 5 filingsProvides electrical installation and contracting services for residential, commercial and industrial construction projects. Works with developers and contractors to design, engineer and install…
Serves property developers and construction-sector clients delivering large-scale residential apartment schemes, plus commercial and industrial developments, mainly in London and surrounding South UK…
Financial Health
DistressedDistressed · -10% CAGR over 4y
Location
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Computed from 3 filingsProvides electrical installation and maintenance services for residential and commercial properties, including full rewires, testing and inspection, EV charger installation, CCTV and security…
Serves homeowners, landlords, estate agents, property developers, builders, commercial property operators and local authorities across London, Hertfordshire and Buckinghamshire.
Financial Health
StrongStrong · Growing, Hiring · 36% CAGR over 2y
Location
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Computed from 5 filingsProvides electrical contracting and building services including electrical design and installation, compliance testing, maintenance, fire stopping, smoke alarm installation, lighting systems,…
Serves public sector bodies, housing providers, commercial property managers and domestic customers in London and the South East needing building, refurbishment and electrical works.
Financial Health
StrongStrong · Growing, Hiring · 84% CAGR over 5y
Location
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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
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Computed from 5 filingsProvides electrical design, installation and maintenance for commercial, industrial and healthcare projects. Services include data cabling, fire and intruder alarms, CCTV, emergency lighting, testing…
Serves commercial and industrial organisations, healthcare facilities, specialist contractors and property developers in London and the South East needing electrical contractors for complex projects.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services for residential and commercial properties, including installations, rewiring, fuse box upgrades, lighting installation, electrical inspections (EICR and PAT…
Serves homeowners and commercial organisations of all sizes in Fulham, Chelsea, Kensington and wider West London, including residential property owners and businesses needing planned, emergency and…
Financial Health
WeakWeak · Hiring · 41% CAGR over 4y
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Computed from 5 filingsProvides electrical installation, inspection, and maintenance services for domestic and commercial properties, including EICR testing, PAT testing, planned preventative maintenance, emergency…
Serves private and commercial clients across London, including property management agents, educational establishments, local authorities, and owners or occupiers of domestic and commercial premises.
Financial Health
WeakWeak · -12% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including installation, design and maintenance, electrical installation condition reports, emergency lighting systems, access control and CCTV installation,…
Serves domestic customers, commercial businesses, education providers and industrial sites across London and South East England.
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
Location
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Computed from 3 filingsProvides electrical contracting services including electrical design, installation, testing, inspection and maintenance. Works on commercial and office fit‑out and refurbishment projects, delivering…
Serves businesses, property developers and main contractors needing electrical support for commercial fit-outs, office refurbishments and maintenance projects, particularly in London.
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 2y
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Computed from 5 filingsProvides mechanical and electrical contracting services for commercial and industrial building projects, including HVAC installation, electrical systems, plumbing, fire alarms, emergency lighting,…
Serves main contractors and construction project teams across London and the South East, working on commercial, industrial and selected residential building projects needing MEP and building services…
Financial Health
HealthyHealthy · Hiring · 36% CAGR over 5y
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Computed from 5 filingsProvides electrical installation, repair, testing and maintenance services for domestic and commercial properties, including rewiring, fault finding, electrical installation condition reports (EICR),…
Serves domestic and commercial customers across London and surrounding areas, including homeowners, landlords, offices, retailers, contractors, surveyors, insurance providers and interior/garden…
Financial Health
WeakWeak · -7% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including design, installation, testing and certification of electrical systems. Installs and maintains fire and security alarms, CCTV, smoke ventilation…
Serves domestic, commercial and industrial property owners, landlords and facilities managers in London and surrounding areas, including homes, offices and other premises needing electrical and…
Financial Health
StrongStrong · Hiring · 6% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including installation, design, maintenance and testing for commercial, industrial and domestic properties. Services include full rewires, lighting and…
Sells to commercial, industrial and domestic customers, including businesses needing major electrical projects and homeowners requiring installations, upgrades and inspections. Serves clients across…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 5y
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Computed from 5 filingsProvides electrical contracting services including design, installation, commissioning and maintenance of electrical systems for domestic, commercial, industrial and educational premises. Also…
Serves domestic customers, commercial and industrial organisations, and schools or educational premises across London and the South East, including larger properties needing contractor support.
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StrongStrong · Growing, Hiring · 9% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including design and installation of electrical systems, lighting design consultancy, data cabling installation and testing, audio‑visual system integration,…
Serves businesses, education providers, heritage sites and high-end residential clients across London and the South West, including offices, retail spaces, industrial facilities, schools,…
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HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides electrical installation, maintenance, testing and inspection services for domestic, commercial, retail and industrial properties. Also offers electrical consultancy, lighting and…
Serves homeowners, high-end residential property owners, commercial offices, retail, industrial and telecoms clients across London and the South East, including property developers and businesses…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including installation, maintenance and compliance testing for domestic and commercial properties. Services cover fire alarm and emergency lighting systems,…
Serves housing associations, local authorities, public-sector estate teams and commercial property owners in London and the South East.
Financial Health
HealthyHealthy · 2% CAGR over 4y
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Computed from 5 filingsProvides mechanical and electrical contracting services for residential and commercial construction projects, including electrical installations, rewiring, testing and fuse board upgrades, as well as…
Serves main contractors, housebuilders and property developers in the commercial and private sectors, especially large new-build and refurbishment projects across London, Essex, Kent and nearby…
Financial Health
StableStable · -61% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including design, installation, and maintenance for commercial fit‑outs. Delivers lighting systems, data cabling and networks, fire alarms, emergency…
Serves mainly B2B customers including landlords, commercial property teams, fit-out contractors and businesses in retail, leisure, hospitality, offices, education and health & fitness, plus some…
Financial Health
HealthyHealthy · Hiring · 16% CAGR over 4y
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Computed from 2 filingsProvides electrical contracting services including design, installation, maintenance, and inspection of electrical systems. Works on residential, commercial, industrial, and educational projects, and…
Serves homeowners, commercial and industrial property clients, schools, universities and event organisers across South London and Surrey.
Financial Health
WeakWeak · Hiring · 33% CAGR over 1y
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Computed from 5 filingsProvides electrical contracting services for residential, commercial and social housing properties, including electrical maintenance and repairs, lighting and power installations, consumer unit…
Serves homeowners, landlords, commercial businesses and social housing providers across London and the Slough area.
Financial Health
StrongStrong · Growing, Hiring · 9% CAGR over 4y
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Computed from 2 filingsProvides construction and building maintenance services, including electrical installations, fire safety systems, ventilation works, and related technical services. Acts as a contractor and principal…
Serves B2B clients needing contractors for construction and maintenance projects, including site owners, property managers and organisations managing larger projects across Greater London and beyond.
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StrongStrong · Growing, Hiring · 199% CAGR over 1y
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Computed from 3 filingsProvides electrical installation, maintenance, repair and inspection services for commercial, industrial and residential properties. Also delivers mechanical and electrical packages including air…
Serves commercial, industrial and residential clients in London, including landlords, block management agents, property owners and homeowners with properties of varying sizes.
Financial Health
StableStable · 0% CAGR over 2y
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Computed from 5 filingsProvides temporary electrical installations for construction sites and delivers electrical and mechanical building services, including installation and support of power, lighting and related systems…
Serves construction firms, main contractors and property developers needing site support and building services for projects in London and the South of England.
Financial Health
HealthyHealthy · -6% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting and design services for building projects, including electrical installations, lighting control systems, home automation, mechanical services coordination, and project…
Serves main contractors, property developers and public-sector clients on large commercial, retail, healthcare, education, transport and mixed-use building projects.
Financial Health
StableStable · -54% CAGR over 5y
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Computed from 5 filingsProvides electrical contracting services for residential and commercial properties, including electrical installations, repairs, fault finding, full and partial rewiring, fuse board and RCD repairs,…
Serves homeowners, landlords, commercial property owners and local councils across London, particularly Wandsworth, Hammersmith, Earlsfield, Chelsea, Clapham and Battersea.
Financial Health
WeakWeak · 0% CAGR over 4y
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Computed from 5 filingsProvides mechanical and electrical engineering services including system design, installation, planned and corrective maintenance, and off‑site fabrication. Works on commercial, industrial, rail and…
Serves B2B clients in commercial, industrial, rail and data centre sectors, including project teams, UK agencies and other mechanical and electrical contractors in London and surrounding areas.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including installation, testing and maintenance of electrical systems for domestic and commercial properties. Delivers electrical packages for new-build…
Serves both B2B and B2C customers, including homeowners, landlords, commercial clients, property developers, and social housing providers, with work spanning domestic installs, commercial builds, new…
Financial Health
StrongStrong · Growing, Hiring · 20% CAGR over 4y
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Computed from 2 filingsProvides construction subcontracting services including electrical and mechanical installations, security and fire systems, structured data cabling, underground utilities, temporary power and water…
Serves B2B construction clients, including main contractors, consultants and project teams needing subcontractor support on office, multi-floor, utilities and rail projects in London and the Home…
Financial Health
HealthyHealthy
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Computed from 4 filingsProvides electrical contracting services including commercial and domestic installations for new‑build projects, electrical testing, and project management, working with developers, contractors and…
Serves local councils, property developers, main contractors and domestic customers commissioning commercial and residential new-build projects across London and Essex.
Financial Health
HealthyHealthy · -11% CAGR over 3y
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Computed from 4 filingsProvides electrical installation, inspection and testing (EICR), maintenance, fault finding and repair for commercial and residential properties, including schools. Also installs emergency lighting…
Serves commercial clients and residential customers across London, Kent and the South-East, including schools, academies, offices, retailers, warehouses, homeowners, landlords and developers of new…
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StrongStrong · Growing, Hiring · 5% CAGR over 3y
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Computed from 4 filingsProvides electrical engineering services including design, installation, inspection, testing and commissioning for domestic, commercial and industrial systems. Also installs fire alarms, CCTV, data…
Serves domestic customers, commercial businesses and industrial organisations requiring electrical engineering support, including property owners, facilities teams and project managers across varied…
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StrongStrong · Growing, Hiring · 19% CAGR over 3y
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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
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Computed from 5 filingsProvides electrical engineering and contracting services including design, installation, commissioning and maintenance of electrical systems for large-scale commercial projects, along with facilities…
Serves B2B and public-sector clients, including facilities managers, commercial property owners, shopping centres, housing providers and main contractors on large-scale premises projects.
Financial Health
StrongStrong
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Computed from 4 filingsProvides commercial and industrial electrical contracting, including electrical installation, maintenance and emergency call‑outs. Also delivers facilities management, fire and security services,…
Serves companies of all sizes, commercial offices, industrial sites, hospitality and leisure venues, education estates and property managers across London and the UK needing ongoing contractor…
Financial Health
StrongStrong · Growing, Hiring · 21% CAGR over 3y
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Computed from 5 filingsProvides electrical contracting and inspection services for residential and commercial properties, including electrical installation, testing and certification, PAT testing, emergency lighting…
Serves residential and commercial customers needing electrical, fire and security services, including homeowners, landlords, flat developments, restaurants, warehouses and places of worship,…
Financial Health
WeakWeak · Hiring · 28% CAGR over 4y
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Computed from 3 filingsProvides electrical subcontracting for construction projects, specialising in Cat A and Cat B commercial fit-outs. Installs lighting, power distribution, fire detection and security systems for…
Targets main contractors, developers, landlords and occupiers in London and the South East, especially commercial fit-out projects, plus industrial, residential, education, leisure, government…
Financial Health
HealthyHealthy · Hiring · 13% CAGR over 2y
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Computed from 5 filingsProvides commercial electrical contracting services including installation, maintenance, inspection and testing of electrical systems and emergency lighting. Works on offices, retail and educational…
Serves B2B commercial and education clients, including offices, retail premises, business centres, universities and schools, mainly in London and the Home Counties.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides electrical contracting services including design, installation, commissioning and maintenance of electrical systems for residential, commercial and public buildings. Also carries out…
Serves residential customers, property owners/managers, schools, hospitals and commercial property clients, covering both new and existing houses, flats and organisational premises.
Financial Health
StableStable · -11% CAGR over 4y
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Computed from 5 filingsProvides mechanical and electrical engineering services for construction projects, including MEP system design, digital construction, installation and commissioning. Works on developments such as…
Serves B2B and public sector clients commissioning mechanical and electrical engineering on construction projects, particularly in data centres, commercial offices, banking, infrastructure, sciences,…
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HealthyHealthy · Growing · 1% CAGR over 4y
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How London Electrical Contracting companies work and how to sell to them
What they do
Electrical contractors earn revenue through labour, materials mark-up, planned maintenance and project packages rather than a single repeatable product sale. Smaller dwelling jobs are often priced as call-out fees, fixed inspection charges or quoted remedial works, while commercial and construction work is usually tendered as fixed-price, schedule-of-rates or time-and-materials packages. Materials are typically passed through with a margin, and labour utilisation matters because qualified electricians, supervisors and project managers are the main capacity constraint. Retained customers may buy periodic inspection, emergency response and planned maintenance, giving contractors a steadier base alongside lumpy installation work.
Who they sell to
Most London contractors sell into property and construction buying chains, where the direct customer is often a principal contractor, landlord, managing agent, facilities-management team or public-sector estates function. Day-to-day decision-makers typically include project managers, contract managers, quantity surveyors, estates managers, compliance leads and procurement teams, with finance sign-off when packages become larger or framework-based. Small jobs can be won through local search, referral and direct enquiry, but commercial work tends to move through approved supplier lists, tender portals, facilities-management subcontracting and repeat relationships. Sales cycles range from same-week reactive work to longer pre-qualification and tender processes.
What they buy
Most electrical contracting firms tend to spend on systems and services that help them quote work, deploy labour, evidence compliance and protect margins. Common software categories include estimating, job management, scheduling, mobile forms, certificate production, document storage, accounting, payroll, CRM, health-and-safety management and basic analytics. Larger contractors may also need fleet management, asset tracking, subcontractor control, cyber security, managed IT and project cost reporting. Outside software, regular purchases include insurance, legal advice, accountancy, recruitment, training, test instruments, access equipment, PPE, vehicles, cable, containment and electrical components bought through trade supply channels.
Why and how to sell to them
Electrical-contracting buyers tend to evaluate suppliers when administrative load starts to constrain site delivery: new maintenance contracts, a move into multi-site commercial work, a run of inspection deadlines, hiring additional electricians and supervisors, or tougher documentation requirements from property and construction clients. Pain points usually sit around labour scheduling, late paperwork, quote turnaround, cash-flow, retentions, compliance evidence and coordination with other trades. Outbound is more credible when it links to a specific operating trigger, such as newly advertised project roles or public-sector tender activity, and frames the offer around fewer missed visits, faster certification, clearer audit trails or better margin control.
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
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Frequently asked questions
How many electrical contracting companies are there in London?
What counts as a electrical contracting company in this list?
Which are the largest electrical contracting companies in London?
What do electrical contracting companies in London actually do?
How does London electrical contracting compare internationally?
How is this list built and how fresh is the data?
How big are the typical electrical contracting companies in London?
Are these mostly new or established electrical contracting companies?
What SIC codes does this use?
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