Turn this list into pipeline.
Electrical Contracting Companies in Southampton: 434 Active Firms (2026)
Electrical contracting companies install, inspect and test building wiring and power systems for customers in and around Southampton.
Buying centres tend to sit with facilities managers, principal contractors, landlords, developers and local public-sector estates teams, with work ranging from responsive testing visits to planned maintenance schedules and project packages attached to refurbishments or new-build schemes. The practical buyer is usually managing compliance risk, programme timing and access to occupied buildings, so evidence of qualified labour, inspection discipline and clear documentation matters as much as the installation itself. Southampton-area suppliers in this niche typically sell into business-to-business and public-sector accounts, with residential work more often tied to landlord portfolios, housing maintenance or smaller contractor referrals.
Read more
Southampton has 434 actively trading electrical contracting companies in this list, a local market that appears broad but still mostly SME-shaped. The reported employment footprint is 998 people, pointing to a base of owner-managed teams and small delivery workforces rather than a concentration of very large contractors. Only 9 companies report turnover above £5M, while 78 have been incorporated since 2022, so the cohort combines long-running local contractors with newer entrants serving fit-out, landlord compliance, housing maintenance and facilities-management demand across the city and nearby commuting area.
Domestic electrical work in England sits within Building Regulations Part P, with Approved Document P setting statutory guidance for electrical safety in dwellings. The regime matters commercially because some jobs require notification, and because customers may expect installation, inspection, testing and handover information to be evidenced rather than merely asserted. Installers can use a competent person scheme to self-certify certain building work instead of seeking separate building regulations approval, and electrical-scheme members appear on the electrical competent person register. The Building Safety Regulator adds a wider oversight layer for building safety and standards in England.
Demand appears tied less to one-off construction cycles than to a mix of compliance testing, maintenance and refurbishment, which tends to favour contractors that can schedule work around occupied sites and keep certification tidy. The cohort's shape suggests limited scale-up depth: many firms look like local trade businesses, while the revenue-ranked end is comparatively thin. Margin pressure may persist where labour availability, materials pricing and subcontractor dependence meet fixed-price building programmes. Consolidation could remain selective, focused on contractors with repeat facilities-management relationships, housing-maintenance exposure or public-sector framework access, rather than broad roll-ups of small electricians.
434
Active firms
2026
9
Above £5M
turnover threshold
78
Since 2022
new incorporations
Key facts
About 2% of the trading cohort reports turnover above £5M (9 of 434 firms) — the rest sits below that revenue band.
17% of the cohort was incorporated since 2022 (78 firms), so a sizeable share is in its first few filing cycles.
Building Regulations Part P covers electrical safety in dwellings in England, including design, installation, inspection, testing and handover information.
Competent person scheme members can self-certify certain electrical work instead of obtaining 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 £35.9 billion in 2024, giving local electrical contractors a sizeable national demand backdrop.
Top Southampton Electrical Contracting companies
QUAYSIDE ELECTRICAL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for commercial and domestic projects, including new-build electrical installations, lighting and power systems, audio‑visual and smart home setups, security…
Serves commercial clients, housebuilders and new-build developers, as well as domestic homeowners across Southampton, the South Coast and wider UK.
Financial Health
StableStable · -10% CAGR over 4y
Location
T & W ELECTRICAL (SOUTH COAST) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical design and installation services for domestic, commercial and industrial projects, including mains distribution, lighting and power systems, structured data…
Serves domestic customers, property developers, and commercial and industrial organisations across the South Coast and wider South of England, including clients with small installations and larger…
Financial Health
DistressedDistressed · -3% CAGR over 4y
Location
TARNWALK (UK) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including electrical installations, design and build of electrical systems, testing and inspection, maintenance, energy‑efficiency upgrades, and installation…
Serves businesses, main contractors and commercial property clients, including retail stores, offices and other premises, with projects emphasised in Hampshire and wider UK locations.
Financial Health
HealthyHealthy · -70% CAGR over 4y
Location
AVENUE ELECTRICAL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides commercial and industrial electrical design and installation services, including mains and sub‑mains distribution, containment systems, power and lighting, fire alarms, voice and data…
Serves B2B commercial and industrial clients, including property owners, facilities managers, contractors and construction project teams needing electrical project support.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
Dynamic Electrical Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical design, installation and maintenance services for domestic, commercial and industrial projects. Services include wiring for new housing developments, EV charging point…
Serves a mix of B2C and B2B customers, including homeowners, new housing developers, commercial clients and industrial businesses. Also targets organisations needing renewable energy, EV charging,…
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 4y
Location
GA UK GROUP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical, mechanical, plumbing and heating contracting services including system design, installation and maintenance. Also installs fire and security systems, generators, pumps and…
Serves a mix of businesses and homeowners, including industrial sites, commercial property operators, airports, residential customers, commercial catering businesses, and clients with domestic or…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
JAMES LISTON BUILDING SERVICES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services, including design and installation of M&E systems for commercial, industrial, domestic and public sector building construction and refurbishment…
Serves commercial and industrial businesses, public sector organisations and domestic clients, including schools, churches, hospitals, hotels, housing developments, factories and transport facilities…
Financial Health
HealthyHealthy · -55% CAGR over 5y
Location
MERDON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and electrical contracting services including boiler installation, servicing and repairs, central heating systems, bathroom installations, underfloor heating, drainage, electrical…
Serves residential and small commercial customers in Hampshire, including homeowners, landlords and property managers needing plumbing, heating, gas and electrical contractor support.
Financial Health
DistressedDistressed · -70% CAGR over 4y
Location
R.G. BEATTIE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical contracting services including design, supply, installation and commissioning of building systems. Also undertakes main contracting works, renewable installations,…
Serves B2B clients in construction and property projects across the south of the UK, including developers, main contractors, facilities teams and commercial building owners needing electrical,…
Financial Health
StableStable · -70% CAGR over 4y
Location
EMPIRE ELECTRICAL & MECHANICAL SOLUTIONS LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides electrical and mechanical engineering services including installation, maintenance, and design‑and‑build projects. Works on commercial, industrial, and domestic systems, and delivers…
Serves a mix of B2B, B2C and public sector clients, including commercial premises, industrial sites, homeowners, renewable energy project customers and government bodies seeking tendered electrical…
Financial Health
StrongStrong · Growing, Hiring · 67% CAGR over 3y
Location
LEXA GROUP LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting and installation of audio‑visual, security, smart home automation and energy systems for residential and commercial properties. Services include system design,…
Serves residential homeowners and commercial clients across Hampshire and the South of England, including luxury homeowners and businesses with property technology, security, electrical and energy…
Financial Health
StableStable · -11% CAGR over 2y
Location
Wilson & Ward Electrical Services Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
ELECTRICAL VENTILATION RENEWABLES LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsInstalls and maintains renewable energy and electrical systems for residential and commercial properties, including solar panels, battery storage, EV charging points, ventilation systems, LED…
Serves both consumers and businesses. Sells to homeowners seeking solar, battery storage, EV charging, ventilation and electrical services, plus commercial property occupiers and businesses needing…
Financial Health
StableStable · Hiring · 78% CAGR over 1y
Location
JEM Electrical Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong · Hiring · 100% CAGR over 1y
Location
RIGFONE ELECTRICS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including design, project engineering, and installation of electrical systems. Delivers electrical project work for commercial and other clients using…
Serves a diverse, established B2B client base needing electrical project services, likely including commercial organisations, contractors and property-related clients with project-specific…
Financial Health
WeakWeak
Location
VOLTWAVEUK LTD
Trajectory
1y · 2024–NowProvides electrical and renewable energy installation services for residential and commercial properties, including solar PV systems, air source heat pumps, EV chargers, battery storage, smart…
Serves UK homeowners, landlords, property managers and businesses with residential or commercial premises seeking energy-efficiency and renewable energy upgrades.
Financial Health
Insufficient historyInsufficient history
Location
Rise Lift Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Loughlin Electrical Services Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
PEVIAP LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
KRIS SFM SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
GK International Marine Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
OWEN ELECTRICAL SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Yellow Electrical and Property Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Green Lizard Electrical Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
BEAR ELECTRICAL CONTRACTORS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
SMART ENERGY SOLAR LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
Imagine Electrical Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Andluc Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
JAMES LISTON ELECTRICAL LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · -90% CAGR over 2y
Location
CACAP ELECTRICAL LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
PILGRIM ELECTRICAL AND PROPERTY SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Edge Technology Power Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies industrial and portable generators including petrol, diesel and gas models through an online shop. Provides generator installation, servicing, maintenance, load testing and repair services,…
Serves UK businesses needing standby or prime power, especially commercial and industrial sites using large generators, plus homeowners and online buyers seeking portable power equipment and related…
Financial Health
WeakWeak · Hiring · 5% CAGR over 4y
Location
R G N Electrical Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic and commercial properties, including new-build electrical installations, property rewiring, inspection and testing, and general electrical…
Serves B2C homeowners and B2B clients such as landlords, builders, property developers and commercial premises in New Forest, Southampton and surrounding areas, including domestic properties,…
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
B H M Electrical Services Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services for domestic, commercial and industrial clients, including electrical installations, inspection and testing, PAT testing, emergency lighting systems, EV…
Serves homeowners, businesses, industrial operators and public-sector premises such as schools across Hampshire and surrounding areas.
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 2y
Location
CEI ELECTRICAL SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical, mechanical, and plumbing services including industrial, commercial, residential and marine electrical installations, heating and ventilation systems, gas and plumbing work,…
Serves local government bodies, schools, sports and civic facilities, private developers, defence organisations, builders, contractors, industrial and commercial businesses, plus domestic homeowners…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 2y
Location
LSB ELECTRICAL LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical, plumbing and heating installation, maintenance and servicing for domestic and commercial properties. Services include rewiring, fuse box upgrades, lighting, CCTV and alarms,…
Serves domestic clients, landlords, main contractors, developers, management agents, and commercial, agricultural and retail businesses in Hampshire and Dorset.
Financial Health
StableStable · Hiring · 22% CAGR over 3y
Location
R.F.A. CONTRACTORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting, fire alarm and detection system design, installation and maintenance, and facilities maintenance services. Also undertakes building fabric repairs, refurbishments,…
Serves B2B and public sector customers, selling to commercial, industrial, retail, government, leisure and residential property operators needing facilities maintenance and minor works, particularly…
Financial Health
HealthyHealthy · -72% CAGR over 4y
Location
DCE Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical installation, maintenance and testing services for domestic and commercial properties, including electrical certificates and condition reports. Supplies and installs electric…
Serves homeowners and businesses across the south of England, including supermarkets, schools, offices and single retail outlets, with domestic and commercial electrical and EV charging needs.
Financial Health
HealthyHealthy · Hiring · 50% CAGR over 4y
Location
PUNTON ELECTRICS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical installation, maintenance and repair services for domestic and commercial properties, including fault finding, rewiring, socket and lighting work, electrical condition reports,…
Serves homeowners, landlords, local businesses and marine customers across Lymington, the New Forest and Hampshire, including property buyers, sellers and EV charger users.
Financial Health
StableStable · -15% CAGR over 2y
Location
Mg Cavill & Co Services Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides electrical, mechanical and building services including plumbing, heating, wiring, lighting, security and fire systems installation. Installs renewable energy systems such as solar PV,…
Serves homeowners, commercial businesses and industrial clients needing building, electrical, mechanical, interiors, data infrastructure and renewable energy services, mainly in Hampshire, Wiltshire…
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
Location
Solarpowerful Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides design and installation of solar PV systems, battery energy storage, electric vehicle charging points and heat pumps for residential and commercial properties, alongside electrical…
Serves homeowners, commercial premises and industrial sites in Hampshire and nearby areas, including property owners and businesses investing in renewable energy and electrical upgrades.
Financial Health
HealthyHealthy
Location
Charlton (Electrical Contractors) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical installation services for domestic, commercial, industrial and construction projects. Carries out wiring, electrical system installations, and electrical testing and inspection…
Serves domestic customers, commercial businesses, industrial clients and construction-sector customers, mainly in Hampshire, Dorset and Wiltshire, with larger customers in Berkshire, Surrey and…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Our MEP Co. Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical, electrical and public health (MEP) building services including system design, installation and maintenance. Also offers design-stage consultancy, facilities management, and…
Serves property developers, contractors, building owners and facilities teams in Hampshire across commercial, hospitality, education, culture, assisted living, ports and high-end residential projects.
Financial Health
StrongStrong
Location
ELECTRICAL & ELECTRONIC FIRE & SECURITY SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls, services and repairs electrical, fire and security systems including CCTV, access control, door entry, intercoms, intruder and fire alarms, automatic gates and barriers. Also provides…
Serves commercial, industrial and domestic customers, including property and block management companies, care and arts organisations, and technical industries across Hampshire, Dorset, Wiltshire,…
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
RJS ELECTRICAL (NEW FOREST) LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical installation, rewiring, and maintenance services for domestic, commercial, and industrial properties. Services include fire alarm and emergency lighting systems, fault finding and…
Serves homeowners, home-based businesses, commercial businesses and industrial clients along the south coast, particularly around Hampshire and Dorset.
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
BUTLER & KING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including new installations, rewiring, electrical condition reports, lighting design, network and access control systems, EV charger installation, fire and…
Serves homeowners, landlords, offices, retailers, warehouses and factories needing electrical contractors across Hampshire and surrounding counties, covering residential, commercial and industrial…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
POWERPOINT MECHANICAL & VENTILATION LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides electrical and mechanical contracting services including installation, maintenance and design‑and‑build solutions. Works on commercial, industrial and domestic projects such as schools,…
Serves commercial, industrial, public sector and domestic customers across Southern England, including contractors, local authorities, schools, hospitals, office blocks, warehouses, distribution…
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
L A ELECTRICAL SERVICES SOUTHERN LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic and commercial electrical services including installations, rewiring, fault finding, repairs, electrical testing, landlord certificates, smoke alarms, lighting, consumer unit…
Serves homeowners, landlords and businesses across Portsmouth, Hampshire and the South Coast, including residential properties and commercial premises in Southampton, Chichester, Fareham and Havant.
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
Location
ACPOWERTECH LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including lighting installation, data cabling, fire alarms, security systems, and rewiring. Installs and maintains air conditioning, refrigeration, cold…
Serves commercial and industrial organisations, factories, offices and facilities managers, alongside residential homeowners, across Hampshire, Berkshire, Dorset, West Sussex, Wiltshire and the wider…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
GECKO ELECTRICAL CONTRACTORS LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides electrical contracting services for domestic, commercial, and industrial properties, including wiring and rewiring, socket and installation work. Also installs smart home systems, home…
Serves homeowners, commercial businesses and industrial clients in Hampshire needing electrical contractors, including domestic property owners, workplaces and industrial unit operators.
Financial Health
StrongStrong · Hiring · 66% CAGR over 1y
Location
Unlock all 434 leads
Showing 50 of 434 — +384 more with verified decision-maker contacts, live data, and CRM sync.
How Southampton Electrical Contracting companies work and how to sell to them
What they do
Electrical contractors earn through a mix of fixed-price project work, inspection and testing visits, reactive call-outs and planned maintenance schedules. Larger accounts may sit under term-maintenance arrangements or framework call-offs, while refurbishment and new-build packages are usually tendered against drawings, specifications and site programme. The service is labour-led rather than software-led: qualified electricians, supervisors and test documentation form the core product, with materials and specialist subcontracting wrapped into the price. Smaller jobs are often quoted as time-and-materials or day-rate work; larger commercial packages tend to use staged payments, retention and formal variation control.
Who they sell to
Commercial demand usually comes from facilities managers, estates teams, main contractors, landlords and property managers who need safe delivery, clear certification and minimal disruption to occupied sites. Public-sector and housing-related buyers tend to procure through approved supplier lists, frameworks or competitive quotation, while private landlords and local businesses may buy through referral and repeat relationships. Decision-makers vary by job size: site managers and facilities leads handle urgent works, while finance, procurement and project teams join when the contract affects budgets, access plans or programme risk. Sales cycles can be short for call-outs, but tendered project packages may take months.
What they buy
Most electrical contracting firms tend to spend on field-service management, job scheduling, mobile timesheets, quote-to-invoice workflows, compliance document storage and fleet administration. Contractors with repeat commercial accounts also need estimating tools, project cost tracking, purchase order control, health and safety support, HR administration, insurance, accounting, credit control and payroll. Recruitment and training services matter where qualified labour is the constraint, particularly for inspection and testing capacity. Marketing spend is usually practical: search visibility, local reputation management, case-study material for facilities buyers and bid support for frameworks, rather than broad brand advertising.
Why and how to sell to them
Electrical contracting buyers tend to evaluate suppliers when workload becomes harder to coordinate, certification creates admin drag, or project margins are being eroded by rework, travel time and late variations. Commercial intent may show up in new framework wins, larger public-sector or facilities-management accounts, a move from owner-managed work towards supervisors and back-office staff, or a shift into more inspection-led recurring revenue. Outreach lands better when it connects to programme control, audit trails, cash collection, labour utilisation or compliance evidence. Generic efficiency claims are less persuasive than showing how a contractor can reduce missed appointments, speed up certification or protect margin on fixed-price work.
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 Southampton
Related directories
Frequently asked questions
How many electrical contracting companies are there in Southampton?
What counts as a electrical contracting company in this list?
Which are the largest electrical contracting companies in Southampton?
What do electrical contracting companies in Southampton actually do?
How does Southampton electrical contracting compare internationally?
How is this list built and how fresh is the data?
How big are the typical electrical contracting companies in Southampton?
Are these mostly new or established electrical contracting companies?
What SIC codes does this use?
What buying signals should I look for?
Push these 434 companies into your pipeline.
Find the right decision-makers, see verified company data, and export your list in seconds.