Company lists · Data refreshed September 2026

Top 25 Sustainability consulting companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 112 companies tracked

RevenueBase identified 112 sustainability consulting companies headquartered in Ireland as of September 2026 and tracks 1,224 professional contacts across them, including 286 with verified work emails. Dublin is the largest hub.

This list covers sustainability 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 22, 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 22, 2026 86% judged on-target in blind review

112Companies

1,224Contacts tracked

286Verified emails

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The 25 largest sustainability consulting companies based in Ireland

Ranked by team size

Top 25 of 112 sustainability consulting companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to sustainability 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	Climeaction	Indirect evidence	Cork, IrelandHQ checked Sep 22, 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 22, 2026
2	MACE	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	32 contacts →
	Indirect evidence “We are a global gifting and sustainable merchandise consultancy.” Source: RevenueBase Database · checked Sep 22, 2026
3	KSN Energy	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	32 contacts →
	Indirect evidence “Complex operations made simple.” Source: RevenueBase Database · checked Sep 22, 2026
4	Lawler Sustainability	Indirect evidence	Kilkenny, IrelandHQ checked Sep 22, 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 22, 2026
5	Enviroguide A DNV Company	Strong evidence	Dublin, IrelandHQ checked Sep 22, 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 22, 2026
6	KSN Horizon	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	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 22, 2026
7	Antaris Consulting	Partial evidence	Limerick, IrelandHQ checked Sep 22, 2026	11-50	20 contacts →
	Partial 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 22, 2026
8	Native Events	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	1-10	19 contacts →
	Indirect evidence “Native Events is Ireland’s leading sustainable event production company.” Source: RevenueBase Database · checked Sep 22, 2026
9	Mosart	Partial evidence	IrelandHQ checked Sep 22, 2026	11-50	17 contacts →
	Partial evidence “Providing expert design, energy consulting & training in high performance buildings since 1993.” Source: RevenueBase Database · checked Sep 22, 2026
10	Passive Dynamics	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	15 contacts →
	Indirect evidence “Passive Dynamics was set up in 2020 with a vision that expert knowledge and passion can empower.” Source: RevenueBase Database · checked Sep 22, 2026
11	Sustainabilityworks Ireland	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	1-10	14 contacts →
	Partial evidence “SustainabilityWorks is a consultancy on a mission to accelerate climate action and sustainability in Ireland.” Source: RevenueBase Database · checked Sep 22, 2026
12	ENX	Strong evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	13 contacts →
	Strong evidence “Mechanical, Electrical and Sustainability Consulting Engineers” Source: RevenueBase Database · checked Sep 22, 2026
13	Iqutech	Indirect evidence	Annacotty, IrelandHQ checked Sep 22, 2026	11-50	12 contacts →
	Indirect evidence “At IQUTECH we have long understood and recognised that the best solution to the current disposable model of business is a circular solution.” Source: RevenueBase Database · checked Sep 22, 2026
14	Meehan Green, A KEO Company	Strong evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	11 contacts →
	Strong evidence “Meehan Green is a company based in Dublin, Ireland that provides sustainability and green building certifications consulting services.” Source: RevenueBase Database · checked Sep 22, 2026
15	Carbon Complete	Partial evidence	Galway, IrelandHQ checked Sep 22, 2026	1-10	11 contacts →
	Partial evidence “At Carbon Complete, we specialize in guiding businesses through the complexities of environmental regulations with expert CBAM reporting, sustainability consultancy, and…” Source: RevenueBase Database · checked Sep 22, 2026
16	Veri Connect	Partial evidence	Kilkenny, IrelandHQ checked Sep 22, 2026	11-50	11 contacts →
	Partial evidence “Veri Connect empowers your organisation to deliver measurable sustainability outcomes.” Source: RevenueBase Database · checked Sep 22, 2026
17	Environmental Efficiency	Indirect evidence	Bray, IrelandHQ checked Sep 22, 2026	1-10	10 contacts →
	Indirect 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 22, 2026
18	Boylan Consulting	Partial evidence	IrelandHQ checked Sep 22, 2026	1-10	10 contacts →
	Partial evidence “Boylan Consulting is a motivated, progressive consultancy whose main objective is to provide high quality integrated solutions serving public and private sector clients in the…” Source: RevenueBase Database · checked Sep 22, 2026
19	Geaney Engineering Consultants	Indirect evidence	Waterford, IrelandHQ checked Sep 22, 2026	11-50	9 contacts →
	Indirect evidence “Geaney Engineering Consultants are a building services consultancy, and energy management firm offering comprehensive engineering services, project management services, carbon…” Source: RevenueBase Database · checked Sep 22, 2026
20	GMJ Associates	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	1-10	9 contacts →
	Indirect evidence “Creating Value by Having Values - We believe in harnessing the power of business to make the world a better place We help organisations with: Corporate Social Responsibility (CSR)…” Source: RevenueBase Database · checked Sep 22, 2026
21	Visiongreen Consultancy	Partial evidence	Carlow, IrelandHQ checked Sep 22, 2026	1-10	8 contacts →
	Partial evidence “At VisionGreen we are dedicated to making sustainability accessible to businesses of all sizes.” Source: RevenueBase Database · checked Sep 22, 2026
22	BFA Consulting	Strong evidence	Bray, IrelandHQ checked Sep 22, 2026	1-10	8 contacts →
	Strong evidence “At BFA Consulting, we are passionate about sustainability.” Source: RevenueBase Database · checked Sep 22, 2026
23	Greenstreets Environmental Resources LTD	Indirect evidence	Dublin 8, IrelandHQ checked Sep 22, 2026	11-50	8 contacts →
	Indirect evidence “For over 20 years, Greenstreets has helped companies manage and report on their Extended Producer Responsibility including packaging, electronic products, batteries, textiles, and…” Source: RevenueBase Database · checked Sep 22, 2026
24	ENSEN	Partial evidence	Riverstown Po, IrelandHQ checked Sep 22, 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 22, 2026
25	Philip Farrelly & CO	Indirect evidence	Balbriggan, IrelandHQ checked Sep 22, 2026	1-10	6 contacts →
	Indirect evidence “Established in 1977, Philip Farrelly & Company has been dedicated to excellence in client services, analytical thinking, and adaptive solutions.” Source: RevenueBase Database · checked Sep 22, 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: sustainability 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 sustainability consulting companies.
Partial evidence: Its own public description names part of sustainability consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainability 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 112 sustainability consulting companies based in Ireland

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Sustainability consulting companies based in Ireland at a glance

As of Sep 22, 2026

23.4%Verified-email coverage

10.9Average contacts per company

1-10Median size (employees)

24.1%Largest-city concentration · Dublin

Sep 22, 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 112 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 sustainability 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 “sustainability 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 sustainability 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 sustainability 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, 286 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 22, 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.

Sustainability consulting companies by metro

Sustainability consulting companies in Dublin27

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 sustainability 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 sustainability consulting companies are there based in Ireland?

RevenueBase identified 112 sustainability 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?

Climeaction, headquartered in Cork, tops this list with the largest team on record.

Which city has the most sustainability consulting companies?

Dublin leads with 27 headquartered companies, followed by Cork (5) and Galway (4).

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 286 verified decision-maker contacts tracked across these 112 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 22, 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.