Company lists · Data refreshed September 2026

Top 25 Environmental engineering companies based in Ireland

Name: Environmental engineering companies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 52 companies tracked

RevenueBase identified 52 environmental engineering companies headquartered in Ireland as of September 2026 and tracks 2,177 professional contacts across them, including 808 with verified work emails. Dublin is the largest hub.

This list covers environmental engineering companies headquartered in Ireland, 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 15, 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 15, 2026 86% judged on-target in blind review

52Companies

2,177Contacts tracked

808Verified emails

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The 25 largest environmental engineering companies based in Ireland

Ranked by team size

Top 25 of 52 environmental engineering companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to environmental engineering companies: 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	Nicholas O'dwyer LTD	Strong evidence	Dublin, IrelandHQ checked Sep 15, 2026	201-500	284 contacts →
	Strong evidence “Nicholas O'Dwyer Ltd, Consulting Engineers, provide water engineering, environmental engineering and civil and structural engineering services to public and private sector clients.” Source: RevenueBase Database · checked Sep 15, 2026
2	Roughan & O'donovan	Strong evidence	Sandyford, IrelandHQ checked Sep 15, 2026	201-500	227 contacts →
	Strong evidence “Roughan and O’Donovan (ROD) is a leading civil, environmental and structural engineering consultancy.” Source: RevenueBase Database · checked Sep 15, 2026
3	MWP	Strong evidence	Blackrock, IrelandHQ checked Sep 15, 2026	51-200	160 contacts →
	Strong evidence “MWP is a multi-disciplinary Engineering and Environmental Consulting Practice providing a first class service to its clients since it was founded in 1967.” Source: RevenueBase Database · checked Sep 15, 2026
4	Fehily Timoney And Company	Strong evidence	Cork, IrelandHQ checked Sep 15, 2026	51-200	116 contacts →
	Strong evidence “Fehily Timoney and Company is a Irish civil and environmental, engineering, scientific and planning consultancy specialising in the areas of Sustainable Infrastructure, Planning…” Source: RevenueBase Database · checked Sep 15, 2026
5	Shareridge	Partial evidence	Castlebar, IrelandHQ checked Sep 15, 2026	51-200	106 contacts →
	Partial evidence “Shareridge is a dynamic, modern and innovative civil engineering solutions specialist.” Source: RevenueBase Database · checked Sep 15, 2026
6	Ryan Hanley, NOW Stantec	Strong evidence	Galway, IrelandHQ checked Sep 15, 2026	51-200	98 contacts →
	Strong evidence “Ryan Hanley is a leading Engineering and Environmental Consultancy.” Source: RevenueBase Database · checked Sep 15, 2026
7	Jennings O'donovan & Partners	Partial evidence	Sligo, IrelandHQ checked Sep 15, 2026	51-200	79 contacts →
	Partial evidence “Jennings O’Donovan is a multidisciplinary consulting engineering firm specialising in renewable energy, water supply, wastewater treatment and in the provision of planning and…” Source: RevenueBase Database · checked Sep 15, 2026
8	Axiseng	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	47 contacts →
	Partial evidence “Axiseng Consulting Engineers is a premier independent building services consulting engineering practice, founded in 2004 and celebrating 20 years of excellence in delivering…” Source: RevenueBase Database · checked Sep 15, 2026
9	Malone O'regan Environmental	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	36 contacts →
	Partial evidence “MOR Environmental is a leading environmental consultancy firm with offices in Dublin, Cork and Tullamore.” Source: RevenueBase Database · checked Sep 15, 2026
10	Capcon	Partial evidence	Maynooth, IrelandHQ checked Sep 15, 2026	51-200	26 contacts →
	Partial evidence “Capcon Engineering are rainwater drainage and harvesting specialists providing design consultation and sub-contracting services on large-scale construction projects.” Source: RevenueBase Database · checked Sep 15, 2026
11	FLI Group	Partial evidence	Waterford, IrelandHQ checked Sep 15, 2026	51-200	20 contacts →
	Partial evidence “The FLI Group is a diversified group of companies providing environmental solutions, services and technologies to private and public sector customers in the UK, France, Ireland…” Source: RevenueBase Database · checked Sep 15, 2026
12	Cdga Consultants	Indirect evidence	Cork, IrelandHQ checked Sep 15, 2026	11-50	16 contacts →
	Indirect evidence “CDGA was founded in 1997.” Source: RevenueBase Database · checked Sep 15, 2026
13	Rowan Engineering Consultants	Strong evidence	Trim, IrelandHQ checked Sep 15, 2026	11-50	15 contacts →
	Strong evidence “Rowan Engineering Consultants are a team of excellent people that provide two specialist services - forensic engineering and environmental consultancy.” Source: RevenueBase Database · checked Sep 15, 2026
14	Axis Environmental Services LTD	Partial evidence	Clondrinagh, IrelandHQ checked Sep 15, 2026	1-10	15 contacts →
	Partial evidence “AXIS environmental services provide a professionally tailored environmental consultancy to both the private and public sector.” Source: RevenueBase Database · checked Sep 15, 2026
15	Conway Engineering	Partial evidence	Limerick, IrelandHQ checked Sep 15, 2026	11-50	14 contacts →
	Partial evidence “Conway Engineering have been in operation for over 40 years specialising in the design, manufacture and installation of mechanical and electrical engineering solutions to meet…” Source: RevenueBase Database · checked Sep 15, 2026
16	Doherty Finegan Kelly LTD	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	11 contacts →
	Partial evidence “Doherty Finegan Kelly (DFK) Consulting Engineers are established Engineering Consultants and provide a comprehensive range of consultancy services specialising in all aspects of…” Source: RevenueBase Database · checked Sep 15, 2026
17	Environmental Efficiency	Partial evidence	Bray, IrelandHQ checked Sep 15, 2026	1-10	10 contacts →
	Partial evidence “Our mission is to help improve our clients’ environmental performance in cost effective and practical ways and as a result build a long term relationship.” Source: RevenueBase Database · checked Sep 15, 2026
18	CST Group Consulting Engineers	Partial evidence	Sligo, IrelandHQ checked Sep 15, 2026	1-10	9 contacts →
	Partial evidence “Consulting Civil, Structural & Traffic Engineers with expert knowledge in the fields of - Economic, sustainable development - Traffic Engineering - Road Safety Auditing (RSA)- RTA…” Source: RevenueBase Database · checked Sep 15, 2026
19	ENSEN	Partial evidence	Riverstown Po, IrelandHQ checked Sep 15, 2026	11-50	7 contacts →
	Partial evidence “Energy Sustainability Environment ENSEN is a concept – implementation of sustainable principals through the delivery of Energy and Environmental products and services in a…” Source: RevenueBase Database · checked Sep 15, 2026
20	Coyle Environmental	Partial evidence	Castlerea, IrelandHQ checked Sep 15, 2026	1-10	6 contacts →
	Partial evidence “We specialise in providing Environmental Monitoring and Consulting services, operating nationwide from our base in the West of Ireland.” Source: RevenueBase Database · checked Sep 15, 2026
21	Alan Traynor Consulting Engineers	Indirect evidence	Belturbet, IrelandHQ checked Sep 15, 2026	1-10	6 contacts →
	Indirect evidence “Alan Traynor Consulting Engineers Ltd was formed in and have offices in Belturbet Business Park, Belturbet, Co.” Source: RevenueBase Database · checked Sep 15, 2026
22	Mable Consulting Engineers	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	1-10	6 contacts →
	Partial evidence “Mable Consulting Engineers was founded by Barry McGinn to provide specialist engineering services to a broad range of clients in both the public and private sectors.” Source: RevenueBase Database · checked Sep 15, 2026
23	SSI Environmental	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	4 contacts →
	Partial evidence “SSI Environmental was founded in 1996 specialising initially in the area of Oil & Chemical spill response and containment.” Source: RevenueBase Database · checked Sep 15, 2026
24	APS Consulting Engineers	Partial evidence	Co. Galway, IrelandHQ checked Sep 15, 2026	1-10	4 contacts →
	Partial evidence “APS Consulting Engineers offer a wide range of engineering services including Civil Engineering, Structural Engineering and Project Management services.” Source: RevenueBase Database · checked Sep 15, 2026
25	Fgcl Consulting Engineers	Strong evidence	Blackpool Retail Park, IrelandHQ checked Sep 15, 2026	11-50	4 contacts →
	Strong evidence “FGCL, established since 1988, has extensive experience in the design, administration and supervision of Civil, Structural and Environmental Engineering Projects in the Private and…” Source: RevenueBase Database · checked Sep 15, 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: environmental engineering companies. 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 environmental engineering companies.
Partial evidence: Its own public description names part of environmental engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental engineering companies. 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 52 environmental engineering companies based in Ireland

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Environmental engineering companies based in Ireland at a glance

As of Sep 15, 2026

37.1%Verified-email coverage

41.9Average contacts per company

11-50Median size (employees)

11.5%Largest-city concentration · Dublin

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Email recency for this list is measured worldwide rather than for Ireland, so it is reported there. Company counts and contact totals on this page are exact for Ireland, over 52 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 environmental engineering companies, 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 Ireland whose own description of what they do matches “environmental engineering companies”. 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 environmental engineering companies), 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 environmental engineering companies, and records with no verified work email. Companies headquartered outside Ireland 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, 808 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 15, 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 environmental engineering companies, 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 environmental engineering companies are there based in Ireland?

RevenueBase identified 52 environmental engineering companies headquartered in Ireland 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?

Nicholas O'dwyer LTD, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most environmental engineering companies?

Dublin leads with 6 headquartered companies, followed by Bray (2) and Cork (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 808 verified decision-maker contacts tracked across these 52 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 15, 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.