Company lists · Data refreshed September 2026

Top 25 Marine electrical contractors based in the United Kingdom

Name: Marine electrical contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 1,331 companies tracked

RevenueBase identified 1,331 marine electrical contractors headquartered in the United Kingdom as of September 2026 and tracks 10,960 professional contacts across them, including 2,732 with verified work emails. London is the largest hub.

This list covers marine electrical contractors headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

1,331Companies

10,960Contacts tracked

2,732Verified emails

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The 25 largest marine electrical contractors based in the United Kingdom

Ranked by team size

Top 25 of 1,331 marine electrical contractors based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to marine electrical contractors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Quartzelec Limited	Partial evidence	Rugby, United KingdomHQ checked Sep 17, 2026	501-1,000	412 contacts →
	Partial evidence “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Source: RevenueBase Database · checked Sep 17, 2026
2	Apcl A&p Group Limited	Partial evidence	Hebburn, United KingdomHQ checked Sep 17, 2026	501-1,000	240 contacts →
	Partial evidence “A&P, part of the APCL Group, is a global marine engineering business which operates six dry docks across two strategic locations in the UK and delivers engineering excellence to…” Source: RevenueBase Database · checked Sep 17, 2026
3	Ferguson Marine Port Glasgow Limited	Partial evidence	Port Glasgow, United KingdomHQ checked Sep 17, 2026	201-500	156 contacts →
	Partial evidence “Ferguson Marine (Port Glasgow) Limited is Scotland's leading company in new build, refit and ship repair.” Source: RevenueBase Database · checked Sep 17, 2026
4	Seatrium Offshore Renewable Services LTD	Indirect evidence	Lowestoft, United KingdomHQ checked Sep 17, 2026	n/a	155 contacts →
	Indirect evidence “Seatrium Offshore Renewable Services Ltd (Seatrium ORS) has over 55 years of unparalleled expertise and experience in the offshore energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
5	Interocean Marine Services	Partial evidence	Portlethen, United KingdomHQ checked Sep 17, 2026	51-200	134 contacts →
	Partial evidence “Interocean provide a comprehensive range of services to the offshore oil and gas, marine, and renewable sectors.” Source: RevenueBase Database · checked Sep 17, 2026
6	Dales Marine Services LTD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	120 contacts →
	Partial evidence “Founded in 1987, Dales Marine provide a diverse range of vessel and ship repair, fabrication, steelwork and engineering services for the shipping, oil & gas, chemical and civil…” Source: RevenueBase Database · checked Sep 17, 2026
7	MPI Offshore	Partial evidence	Stokesley, United KingdomHQ checked Sep 17, 2026	51-200	110 contacts →
	Partial evidence “We furnish all-round solutions, including engineering, procurement, and construction in the full value chain of offshore wind and adjacent marine construction activities.” Source: RevenueBase Database · checked Sep 17, 2026
8	Modutec	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	103 contacts →
	Partial evidence “Repair, Conversion and New Build of Marine and Offshore Living Quarters and Technical Buildings.” Source: RevenueBase Database · checked Sep 17, 2026
9	Star International	Indirect evidence	Birkenhead, United KingdomHQ checked Sep 17, 2026	51-200	103 contacts →
	Indirect evidence “Star International specialises in keeping vessels safe and compliant.” Source: RevenueBase Database · checked Sep 17, 2026
10	SMS Group Ship Repair Marine Interiors Marine Engineering SC Sqep	Partial evidence	Southampton, United KingdomHQ checked Sep 17, 2026	51-200	89 contacts →
	Partial evidence “Southampton Marine Services Ltd was established in 2004 and specialises in ship / work boat building, vessel repair and marine engineering; we trade in four markets - Commercial…” Source: RevenueBase Database · checked Sep 17, 2026
11	Shearwater Marine Services	Partial evidence	Sandbank, United KingdomHQ checked Sep 17, 2026	51-200	87 contacts →
	Partial evidence “Founded in 1992, Shearwater Marine Services have since grown to become a highly respected topside and sub-surface marine engineering service provider.” Source: RevenueBase Database · checked Sep 17, 2026
12	Copius Group	Indirect evidence	Newtownabbey, United KingdomHQ checked Sep 17, 2026	201-500	81 contacts →
	Indirect evidence “Copius Group is a premier provider of construction and engineering services, delivering comprehensive solutions for offshore and onshore projects across the globe.” Source: RevenueBase Database · checked Sep 17, 2026
13	Relay Engineering	Indirect evidence	Plymouth, United KingdomHQ checked Sep 17, 2026	51-200	81 contacts →
	Indirect evidence “Established over 30 years ago, Relay was incorporated in 1989 as Relay South-West, later changing its name to Relay Engineering in January 2007.” Source: RevenueBase Database · checked Sep 17, 2026
14	UK Docks Marine Services	Indirect evidence	Tyne & Wear, United KingdomHQ checked Sep 17, 2026	201-500	72 contacts →
	Indirect evidence “UK Docks offers dry docks, afloat repair berths and specialist boat repair facilities throughout the UK and employs specialist service engineers for vessel repair, construction…” Source: RevenueBase Database · checked Sep 17, 2026
15	Royston	Partial evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 17, 2026	51-200	68 contacts →
	Partial evidence “Royston are a dynamic and expanding diesel engine supply, service and repair company operating successfully within the marine, offshore, industrial, defence and rail sectors for…” Source: RevenueBase Database · checked Sep 17, 2026
16	TMS LTD	Strong evidence	Devon, United KingdomHQ checked Sep 17, 2026	51-200	65 contacts →
	Strong evidence “TMS Ltd have in excess of 31 years of expertise as a marine contractor within the Civil Engineering sector.” Source: RevenueBase Database · checked Sep 17, 2026
17	Atlantic Pacific Marine LTD	Partial evidence	Cardiff, United KingdomHQ checked Sep 17, 2026	11-50	63 contacts →
	Partial evidence “Atlantic Pacific Marine is your dedicated marine service specialist.” Source: RevenueBase Database · checked Sep 17, 2026
18	Premier Electrics	Partial evidence	Magherafelt, United KingdomHQ checked Sep 17, 2026	51-200	58 contacts →
	Partial evidence “Premier Electrics have been delivering exciting projects throughout Ireland, UK and Europe since 1993.” Source: RevenueBase Database · checked Sep 17, 2026
19	Aventus Energy	Indirect evidence	Alness, United KingdomHQ checked Sep 17, 2026	11-50	57 contacts →
	Indirect evidence “Aventus Energy Ltd is a recently formed Scottish Highland based company operating from our bespoke premises in Alness.” Source: RevenueBase Database · checked Sep 17, 2026
20	Mcgeoch Technology Limited	Partial evidence	Birmingham, United KingdomHQ checked Sep 17, 2026	51-200	54 contacts →
	Partial evidence “McGeoch Technology specialises in the design and manufacture of high-quality electrical control and instrumentation systems and specialist lighting for both land and sea…” Source: RevenueBase Database · checked Sep 17, 2026
21	Bartech Marine Engineering	Indirect evidence	Colchester, United KingdomHQ checked Sep 17, 2026	51-200	54 contacts →
	Indirect evidence “Providing Safety through Mechanical Excellence.” Source: RevenueBase Database · checked Sep 17, 2026
22	The Wiggett Group LTD	Partial evidence	Brentwood, United KingdomHQ checked Sep 17, 2026	201-500	51 contacts →
	Partial evidence “Wiggett Electrical has gone from strength to strength.” Source: RevenueBase Database · checked Sep 17, 2026
23	NES	Partial evidence	Inverness, United KingdomHQ checked Sep 17, 2026	11-50	51 contacts →
	Partial evidence “NES is an Industrial and Commercial Electrical Engineering and Contracting business, based in the North and North East of Scotland.” Source: RevenueBase Database · checked Sep 17, 2026
24	Berthon	Indirect evidence	Lymington, United KingdomHQ checked Sep 17, 2026	51-200	49 contacts →
	Indirect evidence “Berthon has been trading from our riverside site in Lymington since 1877.” Source: RevenueBase Database · checked Sep 17, 2026
25	The Seaking Group	Strong evidence	Birkenhead, United KingdomHQ checked Sep 17, 2026	51-200	46 contacts →
	Strong evidence “The SeaKing Group offers specialist electrical engineering services to the marine, industrial, commercial, military and offshore sectors.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: marine electrical contractors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names marine electrical contractors.
Partial evidence: Its own public description names part of marine electrical contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine electrical contractors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,331 marine electrical contractors based in the United Kingdom

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Marine electrical contractors based in the United Kingdom at a glance

As of Sep 17, 2026

24.9%Verified-email coverage

8.2Average contacts per company

1-10Median size (employees)

4.4%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

812

11-50

387

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 1,331 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among marine electrical contractors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “marine electrical contractors”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names marine electrical contractors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among marine electrical contractors, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 2,732 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Marine electrical contractors by metro

Marine electrical contractors in London59
Marine electrical contractors in Southampton36

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names marine electrical contractors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many marine electrical contractors are there based in the United Kingdom?

RevenueBase identified 1,331 marine electrical contractors headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Quartzelec Limited, headquartered in Rugby, tops this list with the largest team on record.

Which city has the most marine electrical contractors?

London leads with 59 headquartered companies, followed by Southampton (36) and Plymouth (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,732 verified decision-maker contacts tracked across these 1,331 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.