Company lists · Data refreshed September 2026

Top 25 Offshore construction contractors based in Norway

Name: Offshore construction contractors based in Norway
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 241 companies tracked

RevenueBase identified 241 offshore construction contractors headquartered in Norway as of September 2026 and tracks 14,612 professional contacts across them, including 4,154 with verified work emails. Stavanger is the largest hub.

This list covers offshore construction contractors headquartered in Norway, 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

241Companies

14,612Contacts tracked

4,154Verified emails

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The 25 largest offshore construction contractors based in Norway

Ranked by team size

Top 25 of 241 offshore construction contractors based in Norway, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to offshore construction 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	DOF	Partial evidence	Bergen, NorwayHQ checked Sep 17, 2026	5,001-10,000	2,942 contacts →
	Partial evidence “With a multi-national workforce of over 5,700 personnel, DOF is an international group of companies which owns and operates a fleet of modern offshore/subsea vessels, with an…” Source: RevenueBase Database · checked Sep 17, 2026
2	AGR	Indirect evidence	Oslo, NorwayHQ checked Sep 17, 2026	501-1,000	768 contacts →
	Indirect evidence “AGR – an Aqualis company – is a multidisciplinary consultancy, specialising in drilling & wells, subsurface, marine and subsea solutions, resourcing, technical safety and software…” Source: RevenueBase Database · checked Sep 17, 2026
3	Kaefer Norway	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	1,001-5,000	663 contacts →
	Partial evidence “KAEFER is a part of the KAEFER Group, one of Europe’s largest construction companies.” Source: RevenueBase Database · checked Sep 17, 2026
4	Prosafe	Indirect evidence	N-4068 Stavanger, NorwayHQ checked Sep 17, 2026	n/a	630 contacts →
	Indirect evidence “Prosafe is a leading owner and operator of semi-submersible accommodation vessels.” Source: RevenueBase Database · checked Sep 17, 2026
5	Cosl Drilling Europe AS	Indirect evidence	Sandnes, NorwayHQ checked Sep 17, 2026	501-1,000	629 contacts →
	Indirect evidence “Always do better" is our guiding principle leading us through the energy transition and towards our vision of becoming the preferred supplier of drilling services.” Source: RevenueBase Database · checked Sep 17, 2026
6	Mhwirth	Indirect evidence	Kristiansand, NorwayHQ checked Sep 17, 2026	1,001-5,000	560 contacts →
	Indirect evidence “October 2021.” Source: RevenueBase Database · checked Sep 17, 2026
7	Island Offshore	Partial evidence	Ulsteinvik, NorwayHQ checked Sep 17, 2026	501-1,000	501 contacts →
	Partial evidence “Island Offshore - The Island Offshore Group is a leading provider of services to the offshore industry ranging from Platform Supply, Walk-to-work and Anchor Handling to Advanced…” Source: RevenueBase Database · checked Sep 17, 2026
8	Global Maritime	Partial evidence	Stavanger, NorwayHQ checked Sep 17, 2026	201-500	472 contacts →
	Partial evidence “Global Maritime delivers integrated marine solutions for a changing offshore world.” Source: RevenueBase Database · checked Sep 17, 2026
9	Reach Subsea	Strong evidence	Haugesund, NorwayHQ checked Sep 17, 2026	201-500	454 contacts →
	Strong evidence “Reach Subsea ASA (“Reach Subsea”, “Reach” or “the Group”) is a prominent offshore contractor that offer high quality solutions and technology to clients in need of ocean data and…” Source: RevenueBase Database · checked Sep 17, 2026
10	Eidesvik Offshore ASA	Partial evidence	Langevag, NorwayHQ checked Sep 17, 2026	501-1,000	308 contacts →
	Partial evidence “Offshore Shipping Company.” Source: RevenueBase Database · checked Sep 17, 2026
11	Ocean Installer	Strong evidence	Stavanger, NorwayHQ checked Sep 17, 2026	201-500	299 contacts →
	Strong evidence “Ocean Installer is a leading marine construction company that specializes in offshore installation services with more than 15 years of experience delivering large and complex…” Source: RevenueBase Database · checked Sep 17, 2026
12	Linjebygg AS	Indirect evidence	Molde, NorwayHQ checked Sep 17, 2026	201-500	261 contacts →
	Indirect evidence “Linjebygg provides LIFE CYCLE EXTENSION.” Source: RevenueBase Database · checked Sep 17, 2026
13	Akofs Offshore	Strong evidence	Oslo, NorwayHQ checked Sep 17, 2026	201-500	233 contacts →
	Strong evidence “AKOFS Offshore is a global provider of vessel based subsea well construction and intervention services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
14	Omega Subsea	Partial evidence	Bergen, NorwayHQ checked Sep 17, 2026	201-500	209 contacts →
	Partial evidence “Omega Subsea delivers ROV, survey, engineering, and subsea project services to the global offshore industry.” Source: RevenueBase Database · checked Sep 17, 2026
15	Imenco	Partial evidence	Aksdal, NorwayHQ checked Sep 17, 2026	201-500	199 contacts →
	Partial evidence “Imenco is a group of companies working mainly in five main business areas: Offshore oil & gas, offshore renewables, aquaculture, marine & naval and industrial.” Source: RevenueBase Database · checked Sep 17, 2026
16	Norwegian Group	Indirect evidence	Volda, NorwayHQ checked Sep 17, 2026	201-500	155 contacts →
	Indirect evidence “Norwegian Group AS is a holding company that has a group with several companies under it.” Source: RevenueBase Database · checked Sep 17, 2026
17	PSW Technology	Indirect evidence	Mongstad, NorwayHQ checked Sep 17, 2026	201-500	133 contacts →
	Indirect evidence “PSW Technology offers a wide range of services and solutions to the global drilling industry.” Source: RevenueBase Database · checked Sep 17, 2026
18	Dr.Techn. Olav Olsen AS	Strong evidence	Lysaker, NorwayHQ checked Sep 17, 2026	51-200	125 contacts →
	Strong evidence “Consulting, design and engineering for offshore, coastal and civil construction.” Source: RevenueBase Database · checked Sep 17, 2026
19	Havila Subsea & Renewables	Strong evidence	Aalesund, NorwayHQ checked Sep 17, 2026	201-500	120 contacts →
	Strong evidence “Havila Subsea & Renewables operates an advanced fleet of vessels dedicated to Diving, Offshore Inspection, Repair, and Maintenance (IRM), as well as Construction.” Source: RevenueBase Database · checked Sep 17, 2026
20	Island Drilling Company AS	Partial evidence	Sandsli, NorwayHQ checked Sep 17, 2026	51-200	114 contacts →
	Partial evidence “Island Drilling was established in 2006 by industry veterans and Island Offshore, the leading global player in well intervention, to build and own special purpose semi-submersible…” Source: RevenueBase Database · checked Sep 17, 2026
21	Sevan Deepwater Technology	Indirect evidence	Bergen, NorwayHQ checked Sep 17, 2026	11-50	108 contacts →
	Indirect evidence “Sevan Deepwater Technology is a specialized marine engineering and design house.” Source: RevenueBase Database · checked Sep 17, 2026
22	Techouse AS	Partial evidence	Sandnes, NorwayHQ checked Sep 17, 2026	51-200	106 contacts →
	Partial evidence “Techouse is a leader in the provision of offshore platform processing equipment and services to the international oil & gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
23	NYMO	Partial evidence	Grimstad, NorwayHQ checked Sep 17, 2026	201-500	105 contacts →
	Partial evidence “Nymo is a full-service engineering, procurement and construction company within the oil & gas and process industry.” Source: RevenueBase Database · checked Sep 17, 2026
24	Westcon Yards AS	Partial evidence	Vindafjord, NorwayHQ checked Sep 17, 2026	201-500	103 contacts →
	Partial evidence “Westcon Yards AS is a modern shipyard with a main focus on offshore service, shipbuilding, rig and ship repair.” Source: RevenueBase Database · checked Sep 17, 2026
25	Optime, A Halliburton Service	Indirect evidence	Notodden, NorwayHQ checked Sep 17, 2026	51-200	98 contacts →
	Indirect evidence “Optime, A Halliburton Service is an innovative subsea oil and gas provider focusing on cost efficient solutions specifically towards products within the well access, well…” 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 construction 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 construction contractors.
Partial evidence: Its own public description names part of offshore construction contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name offshore construction 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 241 offshore construction contractors based in Norway

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Offshore construction contractors based in Norway at a glance

As of Sep 17, 2026

28.4%Verified-email coverage

60.6Average contacts per company

11-50Median size (employees)

10.4%Largest-city concentration · Stavanger

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for Norway, so it is reported there. Company counts and contact totals on this page are exact for Norway, over 241 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 construction 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 Norway whose own description of what they do matches “offshore construction 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 construction 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 construction contractors, and records with no verified work email. Companies headquartered outside Norway 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, 4,154 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 construction contractors by metro

Offshore construction contractors in Stavanger25

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 construction 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 construction contractors are there based in Norway?

RevenueBase identified 241 offshore construction contractors headquartered in Norway 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?

DOF, headquartered in Bergen, tops this list with the largest team on record.

Which city has the most offshore construction contractors?

Stavanger leads with 25 headquartered companies, followed by Oslo (16) and Haugesund (13).

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 4,154 verified decision-maker contacts tracked across these 241 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.