Company lists · Data refreshed September 2026

Top 25 Petrochemical plant construction firms based in the United Kingdom

Name: Petrochemical plant construction firms 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 81 companies tracked

RevenueBase identified 81 petrochemical plant construction firms headquartered in the United Kingdom as of September 2026 and tracks 2,521 professional contacts across them, including 708 with verified work emails. London is the largest hub.

This list covers petrochemical plant construction firms 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

81Companies

2,521Contacts tracked

708Verified emails

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The 25 largest petrochemical plant construction firms based in the United Kingdom

Ranked by team size

Top 25 of 81 petrochemical plant construction firms 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 petrochemical plant construction firms: 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	Ineos Grangemouth	Indirect evidence	Grangemouth, United KingdomHQ checked Sep 17, 2026	1,001-5,000	466 contacts →
	Indirect evidence “Located at Grangemouth, some 40km west of Edinburgh, one of INEOS’ largest manufacturing sites directly employs c1500 highly skilled people.” Source: RevenueBase Database · checked Sep 17, 2026
2	NEXOS	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	501-1,000	446 contacts →
	Partial evidence “A new breed of engineering, procurement and construction (EPC) provider that is turning next-gen energy into operational reality, through innovative solutions, partnerships and…” Source: RevenueBase Database · checked Sep 17, 2026
3	Claxton Engineering Services	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 17, 2026	201-500	279 contacts →
	Indirect evidence “Claxton, an AF Gruppen Company, combines decades of industry experience, proprietary technology, and exceptional service quality to cut through offshore installation and…” Source: RevenueBase Database · checked Sep 17, 2026
4	Ledwood Mechanical Engineering LTD	Partial evidence	Pembrokeshire, United KingdomHQ checked Sep 17, 2026	501-1,000	266 contacts →
	Partial evidence “Ledwood is an independent engineering, fabrication and construction company specialising in the delivery of complex projects across the oil, gas, process and energy industries.” Source: RevenueBase Database · checked Sep 17, 2026
5	Wilton Engineering	Indirect evidence	Middlesbrough, United KingdomHQ checked Sep 17, 2026	201-500	188 contacts →
	Indirect evidence “Wilton Engineering is a multi-disciplined Engineering Services provider based on a 113 acre site by the River Tees in Middlesbrough, North-East England.” Source: RevenueBase Database · checked Sep 17, 2026
6	Enka UK Construction Limited	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	10001+	104 contacts →
	Partial evidence “ENKA UK Construction Limited is a commercial real estate company based out of 7 Henrietta Street C/O Redfern Legal LLP, London, United Kingdom.” Source: RevenueBase Database · checked Sep 17, 2026
7	K Home International	Partial evidence	Stockton-on-tees, United KingdomHQ checked Sep 17, 2026	51-200	80 contacts →
	Partial evidence “With over 50 years of continued success, K Home International (KHI) is a family-owned, multi-discipline engineering design and construction company, based in Thornaby…” Source: RevenueBase Database · checked Sep 17, 2026
8	JBA Engineering	Partial evidence	Wynyard, United KingdomHQ checked Sep 17, 2026	11-50	63 contacts →
	Partial evidence “JBA are industry-leading consultants, providing flexible engineering and design solutions, procurement, and construction services.” Source: RevenueBase Database · checked Sep 17, 2026
9	Simon Carves	Indirect evidence	Manchester, United KingdomHQ checked Sep 17, 2026	51-200	44 contacts →
	Indirect evidence “Simon Carves Engineering is a full-service Process Engineering Contractor, providing a comprehensive range of services to the Process and Energy industries worldwide.” Source: RevenueBase Database · checked Sep 17, 2026
10	Quanta EPC	Partial evidence	Cramlington, United KingdomHQ checked Sep 17, 2026	51-200	42 contacts →
	Partial evidence “Quanta delivers engineering, procurement and construction services to the energy industry, working in partnership with our clients to provide integrated end to end solutions…” Source: RevenueBase Database · checked Sep 17, 2026
11	OSL Consulting Engineers	Indirect evidence	Hull, United KingdomHQ checked Sep 17, 2026	51-200	41 contacts →
	Indirect evidence “OSL is a multi-disciplined team of creative, forward thinking technical specialists, working collaboratively with the energy and related sectors to provide quality implemented…” Source: RevenueBase Database · checked Sep 17, 2026
12	Enerfac Solutions	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	51-200	38 contacts →
	Partial evidence “Enerfac Solutions is a global leader in Engineering, Procurement, Construction, and Commissioning (EPCC), delivering innovative, reliable, and technologically advanced services…” Source: RevenueBase Database · checked Sep 17, 2026
13	Flotech Performance Systems	Partial evidence	Chichester, United KingdomHQ checked Sep 17, 2026	11-50	35 contacts →
	Partial evidence “Flotech Performance Systems is a manufacturer and turnkey solutions provider to the Petrochemical, Process and Energy sectors.” Source: RevenueBase Database · checked Sep 17, 2026
14	Eesb Engineering Limited	Indirect evidence	Birkenhead, United KingdomHQ checked Sep 17, 2026	11-50	33 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
15	Chem Resist Group LTD	Partial evidence	Dewsbury, United KingdomHQ checked Sep 17, 2026	51-200	28 contacts →
	Partial evidence “Chem Resist Group is one of Europe’s leading design and manufacturing specialist in the field of Thermoplastic Process Plant.” Source: RevenueBase Database · checked Sep 17, 2026
16	Enisca	Partial evidence	Cookstown, United KingdomHQ checked Sep 17, 2026	51-200	28 contacts →
	Partial evidence “Enisca is a multi-disciplinary design, engineering and construction business operating in the power and environmental sectors delivering innovative, sustainable and quality…” Source: RevenueBase Database · checked Sep 17, 2026
17	Petro GAS LLP	Indirect evidence	London, United KingdomHQ checked Sep 17, 2026	501-1,000	28 contacts →
	Indirect evidence “PetroGas” Company was founded in 1998.” Source: RevenueBase Database · checked Sep 17, 2026
18	AIM Group	Partial evidence	Falkirk, United KingdomHQ checked Sep 17, 2026	51-200	21 contacts →
	Partial evidence “AIM Group are an engineering, fabrication and construction service provider to a range of sectors.” Source: RevenueBase Database · checked Sep 17, 2026
19	Ponticelli UK	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 2026	501-1,000	13 contacts →
	Partial evidence “Ponticelli have over 100 years’ experience delivering industrial scale ENGINEERING, CONSTRUCTION and MAINTENANCE contracts for international clients, employing over people…” Source: RevenueBase Database · checked Sep 17, 2026
20	Forge House Group LTD	Indirect evidence	Darlington, United KingdomHQ checked Sep 17, 2026	11-50	9 contacts →
	Indirect evidence “Forge House Group Ltd is a long established, multi-disciplined engineering company based in Darlington.” Source: RevenueBase Database · checked Sep 17, 2026
21	Clarke Construction Services Limited	Partial evidence	Lichfield, United KingdomHQ checked Sep 17, 2026	11-50	9 contacts →
	Partial evidence “At Clarke Construction (Services) Limited we specialise in construction within the petroleum industry.” Source: RevenueBase Database · checked Sep 17, 2026
22	Puma Engineering & Construction LTD	Indirect evidence	Southampton, United KingdomHQ checked Sep 17, 2026	51-200	8 contacts →
	Indirect evidence “Established in the year our workshops and offices are located in Southampton, Hampshire.” Source: RevenueBase Database · checked Sep 17, 2026
23	Azzcon Limited	Indirect evidence	Stockton-on-tees, United KingdomHQ checked Sep 17, 2026	1-10	5 contacts →
	Indirect evidence “Azzcon Limited is a locally based company working across the North East & Yorkshire.” Source: RevenueBase Database · checked Sep 17, 2026
24	Entegrator Technology	Partial evidence	London, United KingdomHQ checked Sep 17, 2026	11-50	4 contacts →
	Partial evidence “Established in 2014, Entegrator Technology is an engineering, procurement, and construction (EPC) company with a strong track record in industrial projects.” Source: RevenueBase Database · checked Sep 17, 2026
25	Holme Beck Engineering LTD	Indirect evidence	Stockton-on-tees, United KingdomHQ checked Sep 17, 2026	1-10	4 contacts →
	Indirect evidence “Holme Beck Engineering is an independent engineering design and consultancy company that offers a varied range of technical and project expertise, either in house, or through our…” 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: petrochemical plant construction firms. 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 petrochemical plant construction firms.
Partial evidence: Its own public description names part of petrochemical plant construction firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name petrochemical plant construction firms. 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 81 petrochemical plant construction firms based in the United Kingdom

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Petrochemical plant construction firms based in the United Kingdom at a glance

As of Sep 17, 2026

28.1%Verified-email coverage

31.1Average contacts per company

11-50Median size (employees)

21.0%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

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 81 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 petrochemical plant construction firms, 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 “petrochemical plant construction firms”. 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 petrochemical plant construction firms), 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 petrochemical plant construction firms, 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, 708 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.

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 petrochemical plant construction firms, 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 petrochemical plant construction firms are there based in the United Kingdom?

RevenueBase identified 81 petrochemical plant construction firms 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?

Ineos Grangemouth, headquartered in Grangemouth, tops this list with the largest team on record.

Which city has the most petrochemical plant construction firms?

London leads with 17 headquartered companies, followed by Aberdeen (3) and Birmingham (2).

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 708 verified decision-maker contacts tracked across these 81 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.