Company lists · Data refreshed September 2026

Top 25 Environmental consultancy firms based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 2, 2026 182 companies tracked

RevenueBase identified 182 environmental consultancy firms headquartered in Ireland as of September 2026 and tracks 3,012 professional contacts across them, including 1,370 with verified work emails and 119 with mobile numbers. Dublin is the largest hub.

This list covers environmental consultancy firms 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 2, 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 RevenueBase Smart Search rating on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

182Companies

3,012Contacts tracked

1,370Verified emails

119Mobile numbers

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The 25 largest environmental consultancy firms based in Ireland

Ranked by team size

Top 25 of 182 environmental consultancy firms based in Ireland, ranked by team size, largest first. Data refreshed Sep 2, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consultancy 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	O'connor Sutton Cronin	Indirect evidence	Cork, Ireland	201-500	236 contacts →
	Indirect evidence “OCSC is an established International Multidisciplinary Consulting Engineering & Project Management Practice.” Source: RevenueBase Database · checked Sep 2, 2026
2	MKO	Strong evidence	Ireland	201-500	210 contacts →
	Strong evidence “MKO is Ireland’s largest Planning and Environmental consultancy.” Source: RevenueBase Database · checked Sep 2, 2026
3	Dbfl Consulting Engineers LTD	Partial evidence	Ireland	51-200	181 contacts →
	Partial evidence “DBFL is a fully Irish-owned firm specializing in the planning, engineering design and delivery within the property, infrastructure, environmental & energy sectors.” Source: RevenueBase Database · checked Sep 2, 2026
4	MWP	Partial evidence	Ireland	51-200	160 contacts →
	Partial 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 2, 2026
5	Ryan Hanley, NOW Stantec	Strong evidence	Cork, Ireland	51-200	116 contacts →
	Strong evidence “Ryan Hanley is a leading Engineering and Environmental Consultancy.” Source: RevenueBase Database · checked Sep 2, 2026
6	Fehily Timoney And Company	Strong evidence	Cork, Ireland	51-200	115 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 2, 2026
7	Waterman Moylan Consulting Engineers	Strong evidence	Ireland	51-200	102 contacts →
	Strong evidence “Waterman Moylan is a leading engineering and environmental consultancy providing specialist services to our clients in the property, infrastructure and environment markets in…” Source: RevenueBase Database · checked Sep 2, 2026
8	Jennings O'donovan & Partners	Indirect evidence	Sligo, Ireland	51-200	79 contacts →
	Indirect 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 2, 2026
9	Mitchell Mcdermott	Partial evidence	Dublin, Ireland	51-200	75 contacts →
	Partial evidence “Mitchell McDermott is an independent firm of Construction Consultants founded by Paul Mitchell and Anthony McDermott in 2015.” Source: RevenueBase Database · checked Sep 2, 2026
10	Ayrton Group	Indirect evidence	Tallaght, Ireland	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 2, 2026
11	AWN Consulting LTD	Strong evidence	Ireland	51-200	74 contacts →
	Strong evidence “AWN Consulting is a multidisciplinary consultancy offering specialist design advice in respect of a wide range of engineering and environmental disciplines.” Source: RevenueBase Database · checked Sep 2, 2026
12	Southern Scientific Services LTD	Strong evidence	Galway, Ireland	51-200	54 contacts →
	Strong evidence “We are an Irish owned and operated environmental consultancy and testing facility.” Source: RevenueBase Database · checked Sep 2, 2026
13	Axiseng	Indirect evidence	Ireland	11-50	47 contacts →
	Indirect 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 2, 2026
14	NEO Environmental LTD	Strong evidence	Naas, Ireland	11-50	46 contacts →
	Strong evidence “Neo Environmental Ltd is a multidisciplinary consultancy that provide cost effective environmental and technical services to the commercial energy, property, aggregates and…” Source: RevenueBase Database · checked Sep 2, 2026
15	Malone O'regan Environmental	Strong evidence	Dublin, Ireland	11-50	36 contacts →
	Strong evidence “MOR Environmental is a leading environmental consultancy firm with offices in Dublin, Cork and Tullamore.” Source: RevenueBase Database · checked Sep 2, 2026
16	Shorcontrol Safety LTD	Strong evidence	Naas, Ireland	11-50	32 contacts →
	Strong evidence “Shorcontrol Safety is a Safety company which specialises in Safety training, Occupational Hygiene and Environmental consultancy services.” Source: RevenueBase Database · checked Sep 2, 2026
17	Woodrow Sustainable Solutions	Strong evidence	Ballisodare, Ireland	11-50	28 contacts →
	Strong evidence “Woodrow is an environmental consultancy based in Sligo.” Source: RevenueBase Database · checked Sep 2, 2026
18	Scott Cawley LTD	Partial evidence	Blackrock, Ireland	11-50	24 contacts →
	Partial evidence “Our mission is to be the Irish ecological consultancy of choice by providing the best available expertise and solutions for nature to our clients.” Source: RevenueBase Database · checked Sep 2, 2026
19	Enviroguide A DNV Company	Strong evidence	Ireland	11-50	23 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 2, 2026
20	Minerex Environmental LTD	Strong evidence	Dublin, Ireland	11-50	22 contacts →
	Strong 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 2, 2026
21	OMC	Partial evidence	Galway, Ireland	11-50	22 contacts →
	Partial 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 2, 2026
22	Brady Shipman Martin	Strong evidence	Ireland	11-50	21 contacts →
	Strong evidence “Brady Shipman Martin is a leading multi-disciplinary consultancy serving private and public sector clients with landscape architecture, planning, urban design, environmental and…” Source: RevenueBase Database · checked Sep 2, 2026
23	KSN Horizon	Indirect evidence	Dublin, Ireland	11-50	21 contacts →
	Indirect evidence “Climate change, ESG requirements and the transition to a low-carbon economy are reshaping the future of real estate.” Source: RevenueBase Database · checked Sep 2, 2026
24	Antaris Consulting	Strong evidence	Ireland	11-50	20 contacts →
	Strong evidence “Founded in 1994, Antaris is an independent, Irish-owned consultancy and training firm with expertise in ISO Management Systems, Environment, Energy, Sustainability and Climate…” Source: RevenueBase Database · checked Sep 2, 2026
25	OSL Butler Consulting Engineers	Partial evidence	Ireland	11-50	17 contacts →
	Partial evidence “We provide consultancy services to a broad span of clients, large and small, involving projects across all sectors of the construction industry.” Source: RevenueBase Database · checked Sep 2, 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 consultancy 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 environmental consultancy firms.
Partial evidence: Its own public description names part of environmental consultancy firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consultancy 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 182 environmental consultancy firms based in Ireland

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Environmental consultancy firms based in Ireland at a glance

As of Sep 2, 2026

45.5%Verified-email coverage

4.0%Mobile-number coverage

16.5Average contacts per company

1-10Median size (employees)

18.1%Largest-city concentration · Dublin

Sep 2, 2026Page data refreshed

Companies by employee count

1-10

113

11-50

51-200

201-500

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 consultancy 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 Ireland whose own description of what they do matches “environmental consultancy 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 environmental consultancy 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 environmental consultancy firms, 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, 1,370 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 2, 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.

Environmental consultancy firms by metro

Environmental consultancy firms in Dublin33

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 consultancy 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 environmental consultancy firms are there based in Ireland?

RevenueBase identified 182 environmental consultancy firms 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?

O'connor Sutton Cronin, headquartered in Cork, tops this list with the largest team on record.

Which city has the most environmental consultancy firms?

Dublin leads with 33 headquartered companies, followed by Cork (13) and Galway (9).

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 1,370 verified decision-maker contacts tracked across these 182 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 2, 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.