Company lists · Data refreshed September 2026

Top 25 Offshore decommissioning contractors based in the United Kingdom

Name: Offshore decommissioning 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 168 companies tracked

RevenueBase identified 168 offshore decommissioning contractors headquartered in the United Kingdom as of September 2026 and tracks 8,178 professional contacts across them, including 2,883 with verified work emails. Aberdeen is the largest hub.

This list covers offshore decommissioning 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

168Companies

8,178Contacts tracked

2,883Verified emails

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The 25 largest offshore decommissioning contractors based in the United Kingdom

Ranked by team size

Top 25 of 168 offshore decommissioning 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 offshore decommissioning 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	Altera Infrastructure	Partial evidence	Aberdeenshire, United KingdomHQ checked Sep 17, 2026	501-1,000	955 contacts →
	Partial evidence “Altera Infrastructure is a leading global energy infrastructure services group focused on the ownership and operation of offshore energy assets.” Source: RevenueBase Database · checked Sep 17, 2026
2	ABL	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	1,001-5,000	804 contacts →
	Indirect evidence “The Energy and Marine Consultants - an Aqualis company.” Source: RevenueBase Database · checked Sep 17, 2026
3	Dolphin Drilling	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	694 contacts →
	Partial evidence “Dolphin Drilling is the offshore drilling pioneer of the past and for the future.” Source: RevenueBase Database · checked Sep 17, 2026
4	Boskalis Subsea Services	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	516 contacts →
	Partial evidence “Boskalis Subsea Services is a world-leading provider of specialist subsea solutions for the offshore energy industry, seamlessly integrating services to deliver optimum results.” Source: RevenueBase Database · checked Sep 17, 2026
5	Acteon	Partial evidence	Norwich, United KingdomHQ checked Sep 17, 2026	1,001-5,000	192 contacts →
	Partial evidence “Acteon delivers data-driven, engineering-led solutions across the lifecycle of offshore energy infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
6	Aquaterra Energy	Partial evidence	Norwich, United KingdomHQ checked Sep 17, 2026	51-200	167 contacts →
	Partial evidence “Aquaterra Energy provides intelligently engineered products and services for well access and offshore developments - supporting efficient operations across the full life cycle of…” Source: RevenueBase Database · checked Sep 17, 2026
7	Enshore Subsea	Indirect evidence	Blyth, United KingdomHQ checked Sep 17, 2026	51-200	161 contacts →
	Indirect evidence “The globally trusted delivery experts in installing and protecting critical subsea infrastructure.” Source: RevenueBase Database · checked Sep 17, 2026
8	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
9	Aquaterra Group LTD	Indirect evidence	Kintore, United KingdomHQ checked Sep 17, 2026	11-50	123 contacts →
	Indirect evidence “RELIABLE \| RESOURCEFUL \| READY We continually raise the bar by challenging ourselves and our clients to enable safe and efficient performance.” Source: RevenueBase Database · checked Sep 17, 2026
10	Brown And Mason Group Limited	Strong evidence	Dartford, United KingdomHQ checked Sep 17, 2026	201-500	119 contacts →
	Strong evidence “Brown and Mason are Europe's premier Industrial Demolition, Dismantling and Decommissioning contractor.” Source: RevenueBase Database · checked Sep 17, 2026
11	Derrick Services UK LTD	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	51-200	111 contacts →
	Indirect evidence “Derrick Service UK Ltd (DSL) is a diversified oil & gas construction company which provides a broad range of products and services to the market from our Worldwide locations.” Source: RevenueBase Database · checked Sep 17, 2026
12	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
13	James Fisher Offshore	Strong evidence	Oldmeldrum, United KingdomHQ checked Sep 17, 2026	51-200	107 contacts →
	Strong evidence “James Fisher Offshore (JFO) is an international supplier of marine back deck, specialist subsea equipment and engineering services supporting the global subsea contractors across…” Source: RevenueBase Database · checked Sep 17, 2026
14	CTS Offshore & Marine	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	106 contacts →
	Partial evidence “CTS Offshore & Marine Ltd is an independent provider of engineering services tailored for energy and material markets.” Source: RevenueBase Database · checked Sep 17, 2026
15	Awilco Drilling	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	88 contacts →
	Indirect evidence “Awilco Drilling Limited was incorporated in December 2009 in connection with the acquisition of the two semi submersible drilling rigs, WilPhoenix (previously Arctic II) and…” Source: RevenueBase Database · checked Sep 17, 2026
16	KPH Group	Strong evidence	Caterham, United KingdomHQ checked Sep 17, 2026	11-50	57 contacts →
	Strong evidence “We are a specialist contractor providing a unique range of deconstruction, environmental and decommissioning services based on experience, innovation and a commitment to customer…” Source: RevenueBase Database · checked Sep 17, 2026
17	First Marine Solutions	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	55 contacts →
	Indirect evidence “First Marine Solutions is a leading international energy service and equipment organisation with operations worldwide, We provide expertise, technology, techniques and support…” Source: RevenueBase Database · checked Sep 17, 2026
18	Aquatic Engineering & Construction LTD	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	51-200	48 contacts →
	Indirect evidence “Aquatic is unique; they’re the only independent company in the world that has a comprehensive range of modular carousel, drive, and tensioner systems that can be transported…” Source: RevenueBase Database · checked Sep 17, 2026
19	KD Marine LTD	Strong evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	11-50	48 contacts →
	Strong evidence “KD Marine are a commercial diving contractor providing underwater intervention services to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
20	Edwards Diving Services LTD	Indirect evidence	Pontypridd, United KingdomHQ checked Sep 17, 2026	51-200	46 contacts →
	Indirect evidence “EDWARDS DIVING SERVICES LIMITED (EDS) is a specialist Marine & Civil Engineering company located in South Wales, United Kingdom.” Source: RevenueBase Database · checked Sep 17, 2026
21	STS Resources & Technology	Indirect evidence	Middlesbrough, United KingdomHQ checked Sep 17, 2026	11-50	45 contacts →
	Indirect evidence “With over 15 years of experience in the Oil, Gas, and Renewable sectors, StS Resources & Technology is your trusted partner for providing highly skilled personnel across various…” Source: RevenueBase Database · checked Sep 17, 2026
22	GPS Marine Contractors LTD	Partial evidence	Rochester, United KingdomHQ checked Sep 17, 2026	51-200	44 contacts →
	Partial evidence “Marine Contractors specialising in: Marine Civil Engineering and Construction.” Source: RevenueBase Database · checked Sep 17, 2026
23	Deepsea Technologies	Indirect evidence	Bromborough, United KingdomHQ checked Sep 17, 2026	11-50	39 contacts →
	Indirect evidence “With a production and manufacturing facility in Bromborough, Wirral and an engineering office based in Knaphill, Surrey, Deepsea Technologies UK Ltd provides both diver-less and…” Source: RevenueBase Database · checked Sep 17, 2026
24	Costain Upstream LTD	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	201-500	37 contacts →
	Indirect evidence “We provide innovative engineering and technology-led solutions to meet the needs of our customers.” Source: RevenueBase Database · checked Sep 17, 2026
25	Seatronics LTD	Indirect evidence	Westhill, United KingdomHQ checked Sep 17, 2026	51-200	37 contacts →
	Indirect evidence “Seatronics is now part of Ashtead Technology.” 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: offshore decommissioning 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 offshore decommissioning contractors.
Partial evidence: Its own public description names part of offshore decommissioning contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore decommissioning 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 168 offshore decommissioning contractors based in the United Kingdom

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Offshore decommissioning contractors based in the United Kingdom at a glance

As of Sep 17, 2026

35.3%Verified-email coverage

48.7Average contacts per company

11-50Median size (employees)

22.6%Largest-city concentration · Aberdeen

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

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 168 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 offshore decommissioning 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 “offshore decommissioning 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 offshore decommissioning 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 offshore decommissioning 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, 2,883 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.

Offshore decommissioning contractors by metro

Offshore decommissioning contractors in Aberdeen38

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 offshore decommissioning 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 offshore decommissioning contractors are there based in the United Kingdom?

RevenueBase identified 168 offshore decommissioning 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?

Altera Infrastructure, headquartered in Prospect Park, tops this list with the largest team on record.

Which city has the most offshore decommissioning contractors?

Aberdeen leads with 38 headquartered companies, followed by London (12) and Westhill (5).

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 2,883 verified decision-maker contacts tracked across these 168 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.