Company lists · Data refreshed September 2026

Top 25 Environmental consulting companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 107 companies tracked

RevenueBase identified 107 environmental consulting companies headquartered in Ireland as of September 2026 and tracks 2,441 professional contacts across them, including 891 with verified work emails. Dublin is the largest hub.

This list covers environmental consulting 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 19, 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 19, 2026 86% judged on-target in blind review

107Companies

2,441Contacts tracked

891Verified emails

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The 25 largest environmental consulting companies based in Ireland

Ranked by team size

Top 25 of 107 environmental consulting companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consulting 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 19, 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 19, 2026
2	MKO	Partial evidence	Galway, IrelandHQ checked Sep 19, 2026	201-500	210 contacts →
	Partial evidence “MKO is Ireland’s largest Planning and Environmental consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
3	MWP	Strong evidence	Blackrock, IrelandHQ checked Sep 19, 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 19, 2026
4	Fehily Timoney And Company	Partial evidence	Cork, IrelandHQ checked Sep 19, 2026	51-200	116 contacts →
	Partial 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 19, 2026
5	Ryan Hanley, NOW Stantec	Partial evidence	Galway, IrelandHQ checked Sep 19, 2026	51-200	98 contacts →
	Partial evidence “Ryan Hanley is a leading Engineering and Environmental Consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
6	Ayrton Group	Indirect evidence	Dublin 24, IrelandHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Ayrton Group is a dynamic professional services company dedicated to excellence with a diverse portfolio of businesses ranging from risk management, engineering, recruitment…” Source: RevenueBase Database · checked Sep 19, 2026
7	Tandem Project Management LTD	Indirect evidence	Blackrock, IrelandHQ checked Sep 19, 2026	51-200	65 contacts →
	Indirect evidence “Tandem is an engineering consultancy specialising in project management, multi-disciplined engineering design, construction management, energy & carbon reduction, EHS and talent…” Source: RevenueBase Database · checked Sep 19, 2026
8	H2 Compliance	Partial evidence	Dublin, IrelandHQ checked Sep 19, 2026	11-50	56 contacts →
	Partial evidence “H2 Compliance, part of the Landbell Group, is a global consultancy helping businesses navigate the complex world of chemical, environmental, and circular economy compliance.” Source: RevenueBase Database · checked Sep 19, 2026
9	Southern Scientific Services LTD	Partial evidence	Co. Kerry, IrelandHQ checked Sep 19, 2026	51-200	56 contacts →
	Partial evidence “We are an Irish owned and operated environmental consultancy and testing facility.” Source: RevenueBase Database · checked Sep 19, 2026
10	Malone O'regan Environmental	Partial evidence	Dublin, IrelandHQ checked Sep 19, 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 19, 2026
11	Woodrow Sustainable Solutions	Partial evidence	Ballisodare, IrelandHQ checked Sep 19, 2026	11-50	28 contacts →
	Partial evidence “Woodrow is an environmental consultancy based in Sligo.” Source: RevenueBase Database · checked Sep 19, 2026
12	Minerex Environmental LTD	Partial evidence	Dublin 14, IrelandHQ checked Sep 19, 2026	11-50	22 contacts →
	Partial evidence “Minerex Environmental Ltd.(MEL) was established in 1994 as an independent Irish consultancy providing environmental services in the hydrogeological and environmental disciplines…” Source: RevenueBase Database · checked Sep 19, 2026
13	OMC	Indirect evidence	Galway, IrelandHQ checked Sep 19, 2026	11-50	22 contacts →
	Indirect evidence “OMC Group, we provide a seamless, multidisciplinary consultancy service, specialising in engineering, design, and compliance solutions for commercial projects.” Source: RevenueBase Database · checked Sep 19, 2026
14	Enviroguide A DNV Company	Strong evidence	Dublin, IrelandHQ checked Sep 19, 2026	11-50	22 contacts →
	Strong evidence “Enviroguide Consulting has an established reputation for delivering environmental and sustainability consultancy services including ecology, environmental impact assessment…” Source: RevenueBase Database · checked Sep 19, 2026
15	Aquafact	Partial evidence	Galway, IrelandHQ checked Sep 19, 2026	1-10	20 contacts →
	Partial evidence “AQUAFACT, part of APEM Group, is an environmental consultancy established in 1986.” Source: RevenueBase Database · checked Sep 19, 2026
16	FLI Group	Partial evidence	Waterford, IrelandHQ checked Sep 19, 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 19, 2026
17	Cdga Consultants	Indirect evidence	Cork, IrelandHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “CDGA was founded in 1997.” Source: RevenueBase Database · checked Sep 19, 2026
18	TMS Environment LTD	Partial evidence	Dublin, IrelandHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “Specialists in laboratory analysis, monitoring and environmental consultancy” Source: RevenueBase Database · checked Sep 19, 2026
19	Rowan Engineering Consultants	Partial evidence	Trim, IrelandHQ checked Sep 19, 2026	11-50	15 contacts →
	Partial 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 19, 2026
20	Flynn Furney Environmental Consultants LTD	Partial evidence	Kinsale, IrelandHQ checked Sep 19, 2026	1-10	15 contacts →
	Partial evidence “Environmental consultancy involved in ecological surveys and design and environmental monitoring services.” Source: RevenueBase Database · checked Sep 19, 2026
21	Axis Environmental Services LTD	Partial evidence	Clondrinagh, IrelandHQ checked Sep 19, 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 19, 2026
22	Speco Sustainability Consultancy	Indirect evidence	Galway, IrelandHQ checked Sep 19, 2026	1-10	14 contacts →
	Indirect evidence “Speco Sustainability Consultancy Ltd.” Source: RevenueBase Database · checked Sep 19, 2026
23	Clean Technology Centre, MTU	Partial evidence	Cork, IrelandHQ checked Sep 19, 2026	1-10	12 contacts →
	Partial evidence “The Clean Technology Centre is a not-for profit environmental research and consultancy centre of excellence, based in Munster Technological University.” Source: RevenueBase Database · checked Sep 19, 2026
24	Doherty Finegan Kelly LTD	Partial evidence	Dublin, IrelandHQ checked Sep 19, 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 19, 2026
25	Caas LTD	Partial evidence	Dublin, IrelandHQ checked Sep 19, 2026	1-10	11 contacts →
	Partial evidence “CAAS is one of Ireland’s longest established providers of planning and environmental advice to public sector bodies and planning authorities.” Source: RevenueBase Database · checked Sep 19, 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 consulting 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 consulting companies.
Partial evidence: Its own public description names part of environmental consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consulting 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 107 environmental consulting companies based in Ireland

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Environmental consulting companies based in Ireland at a glance

As of Sep 19, 2026

36.5%Verified-email coverage

22.8Average contacts per company

1-10Median size (employees)

17.8%Largest-city concentration · Dublin

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 107 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 consulting 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 consulting 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 consulting 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 consulting 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, 891 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 19, 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 consulting 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 consulting companies are there based in Ireland?

RevenueBase identified 107 environmental consulting 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 consulting companies?

Dublin leads with 19 headquartered companies, followed by Galway (7) and Cork (6).

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 891 verified decision-maker contacts tracked across these 107 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 19, 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.