Company lists · Data refreshed September 2026

Top 25 Climate consultancies based in Ireland

Name: Climate consultancies based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 257 companies tracked

RevenueBase identified 257 climate consultancies headquartered in Ireland as of September 2026 and tracks 3,825 professional contacts across them, including 1,660 with verified work emails. Dublin is the largest hub.

This list covers climate consultancies 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 21, 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 21, 2026 86% judged on-target in blind review

257Companies

3,825Contacts tracked

1,660Verified emails

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The 25 largest climate consultancies based in Ireland

Ranked by team size

Top 25 of 257 climate consultancies based in Ireland, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to climate consultancies: 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	Dublin, IrelandHQ checked Sep 21, 2026	201-500	241 contacts →
	Indirect evidence “OCSC is an established International Multidisciplinary Consulting Engineering & Project Management Practice.” Source: RevenueBase Database · checked Sep 21, 2026
2	MKO	Indirect evidence	Galway, IrelandHQ checked Sep 21, 2026	201-500	210 contacts →
	Indirect evidence “MKO is Ireland’s largest Planning and Environmental consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
3	Landell Mills	Indirect evidence	Blackrock, IrelandHQ checked Sep 21, 2026	51-200	197 contacts →
	Indirect evidence “Leading international development consultancy Providing communities, economies and environments with the means and opportunities to grow Founded in 1975, Landell Mills is a…” Source: RevenueBase Database · checked Sep 21, 2026
4	Dbfl Consulting Engineers LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	178 contacts →
	Indirect 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 21, 2026
5	Egis In Ireland	Indirect evidence	Dundrum Road, IrelandHQ checked Sep 21, 2026	501-1,000	143 contacts →
	Indirect evidence “Egis is a leading global architectural, consulting, construction engineering, operations and mobility services firm.” Source: RevenueBase Database · checked Sep 21, 2026
6	Gavin & Doherty Geosolutions GDG	Indirect evidence	Dublin 14, IrelandHQ checked Sep 21, 2026	51-200	122 contacts →
	Indirect evidence “At Gavin & Doherty Geosolutions (GDG), we are experts at finding innovative engineering solutions to support some of the most challenging offshore wind, marine and infrastructure…” Source: RevenueBase Database · checked Sep 21, 2026
7	Fehily Timoney And Company	Indirect evidence	Cork, IrelandHQ checked Sep 21, 2026	51-200	116 contacts →
	Indirect 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 21, 2026
8	Catalyst	Indirect evidence	Dublin 4, IrelandHQ checked Sep 21, 2026	51-200	99 contacts →
	Indirect evidence “We are a multi-disciplinary ESG, Technical Advisory and digitalisation consultancy with specialist expertise in the real estate, property and construction sectors.” Source: RevenueBase Database · checked Sep 21, 2026
9	Waterman Moylan Consulting Engineers	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	99 contacts →
	Indirect 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 21, 2026
10	Ryan Hanley, NOW Stantec	Indirect evidence	Galway, IrelandHQ checked Sep 21, 2026	51-200	98 contacts →
	Indirect evidence “Ryan Hanley is a leading Engineering and Environmental Consultancy.” Source: RevenueBase Database · checked Sep 21, 2026
11	Mitchell Mcdermott	Indirect evidence	Dublin 4, IrelandHQ checked Sep 21, 2026	51-200	77 contacts →
	Indirect evidence “Mitchell McDermott is an independent firm of Construction Consultants founded by Paul Mitchell and Anthony McDermott in 2015.” Source: RevenueBase Database · checked Sep 21, 2026
12	AWN Consulting LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	74 contacts →
	Indirect 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 21, 2026
13	H2 Compliance	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	56 contacts →
	Indirect 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 21, 2026
14	Southern Scientific Services LTD	Indirect evidence	Co. Kerry, IrelandHQ checked Sep 21, 2026	51-200	56 contacts →
	Indirect evidence “We are an Irish owned and operated environmental consultancy and testing facility.” Source: RevenueBase Database · checked Sep 21, 2026
15	RED Flag Global	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	48 contacts →
	Indirect evidence “Politics, regulation and global movements are becoming more difficult for companies and interest groups to navigate.” Source: RevenueBase Database · checked Sep 21, 2026
16	Climeaction	Indirect evidence	Cork, IrelandHQ checked Sep 21, 2026	11-50	42 contacts →
	Indirect evidence “Climeaction Cork & Boston \| B Corp Certified \| ISO 9001 & Accredited Climeaction is an industrial decarbonisation and carbon intelligence company.” Source: RevenueBase Database · checked Sep 21, 2026
17	Erinn Innovation	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	37 contacts →
	Indirect evidence “ERINN Innovation: Guiding Impactful Research for a Sustainable Future Founded in 2017, ERINN Innovation blossomed from AquaTT UETP CLG's enduring legacy of championing research…” Source: RevenueBase Database · checked Sep 21, 2026
18	Malone O'regan Environmental	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	36 contacts →
	Indirect evidence “MOR Environmental is a leading environmental consultancy firm with offices in Dublin, Cork and Tullamore.” Source: RevenueBase Database · checked Sep 21, 2026
19	KSN Energy	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	32 contacts →
	Indirect evidence “Complex operations made simple.” Source: RevenueBase Database · checked Sep 21, 2026
20	Woodrow Sustainable Solutions	Indirect evidence	Ballisodare, IrelandHQ checked Sep 21, 2026	11-50	28 contacts →
	Indirect evidence “Woodrow is an environmental consultancy based in Sligo.” Source: RevenueBase Database · checked Sep 21, 2026
21	Lbspartners	Partial evidence	Limerick, IrelandHQ checked Sep 21, 2026	11-50	27 contacts →
	Partial evidence “Founded in 2002, LBSPartners is a business consultancy that provides leadership and operational excellence training that specialises in the areas of digitalisation, climate…” Source: RevenueBase Database · checked Sep 21, 2026
22	Horizon Energy Group HEG	Indirect evidence	Cork, IrelandHQ checked Sep 21, 2026	11-50	26 contacts →
	Indirect evidence “Horizon Energy Group delivers technology-led solutions that reduce energy costs, cut carbon and unlock new revenue opportunities.” Source: RevenueBase Database · checked Sep 21, 2026
23	Scott Cawley LTD	Indirect evidence	Blackrock, IrelandHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect 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 21, 2026
24	Lawler Sustainability	Indirect evidence	Kilkenny, IrelandHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Helping Businesses Cut Energy Costs by up to 50% & Accelerate Their Journey to Net Zero!” Source: RevenueBase Database · checked Sep 21, 2026
25	JCA Architects	Indirect evidence	Cork, IrelandHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “Architects and Conservation Consultants.” Source: RevenueBase Database · checked Sep 21, 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: climate consultancies. 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 climate consultancies.
Partial evidence: Its own public description names part of climate consultancies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name climate consultancies. 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 257 climate consultancies based in Ireland

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Climate consultancies based in Ireland at a glance

As of Sep 21, 2026

43.4%Verified-email coverage

14.9Average contacts per company

1-10Median size (employees)

23.7%Largest-city concentration · Dublin

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

177

11-50

51-200

201-500

501-1,000

1,001-5,000

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 257 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 climate consultancies, 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 “climate consultancies”. 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 climate consultancies), 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 climate consultancies, 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, 1,660 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 21, 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.

Climate consultancies by metro

Climate consultancies in Dublin61

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 climate consultancies, 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 climate consultancies are there based in Ireland?

RevenueBase identified 257 climate consultancies 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 Dublin, tops this list with the largest team on record.

Which city has the most climate consultancies?

Dublin leads with 61 headquartered companies, followed by Cork (16) and Galway (11).

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 1,660 verified decision-maker contacts tracked across these 257 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 21, 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.