Company lists · Data refreshed September 2026

Top 25 Sustainable design consultants based in Ireland

Name: Sustainable design consultants based in Ireland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 180 companies tracked

RevenueBase identified 180 sustainable design consultants headquartered in Ireland as of September 2026 and tracks 2,498 professional contacts across them, including 1,172 with verified work emails. Dublin is the largest hub.

This list covers sustainable design consultants 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

180Companies

2,498Contacts tracked

1,172Verified emails

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The 25 largest sustainable design consultants based in Ireland

Ranked by team size

Top 25 of 180 sustainable design consultants 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 sustainable design consultants: 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	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	201-500	284 contacts →
	Indirect 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 22, 2026
2	O'connor Sutton Cronin	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	201-500	241 contacts →
	Indirect evidence “OCSC is an established International Multidisciplinary Consulting Engineering & Project Management Practice.” Source: RevenueBase Database · checked Sep 22, 2026
3	Landell Mills	Partial evidence	Blackrock, IrelandHQ checked Sep 22, 2026	51-200	197 contacts →
	Partial 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 22, 2026
4	Tritech Engineering	Partial evidence	Dublin 22, IrelandHQ checked Sep 22, 2026	201-500	173 contacts →
	Partial evidence “Driving ESG Success Through Precision Engineering Investors today face increasing pressure to achieve higher building performance standards, meet strict sustainability targets…” Source: RevenueBase Database · checked Sep 22, 2026
5	Fehily Timoney And Company	Strong evidence	Cork, IrelandHQ checked Sep 22, 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 22, 2026
6	In2 Engineering	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	100 contacts →
	Indirect evidence “Engineering Firm of the Year 2025 - Engineering Excellence Awards 2025 Great Place To Work 2025-2026 accredited IN2 is a modern building services and environmental engineering…” Source: RevenueBase Database · checked Sep 22, 2026
7	Tandem Project Management LTD	Strong evidence	Blackrock, IrelandHQ checked Sep 22, 2026	51-200	65 contacts →
	Strong 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 22, 2026
8	Varming Consulting Engineers LTD	Partial evidence	Dundrum, IrelandHQ checked Sep 22, 2026	11-50	55 contacts →
	Partial evidence “At Varming, we’re all about cutting-edge design and meticulous oversight of mechanical and electrical services, whether it’s for brand-new constructions or revitalizing existing…” Source: RevenueBase Database · checked Sep 22, 2026
9	Axiseng	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	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 22, 2026
10	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
11	MJF Interiors	Partial evidence	Dublin City, IrelandHQ checked Sep 22, 2026	11-50	38 contacts →
	Partial evidence “We are changing to better reflect the world around us, the design led customers we work with and the business we want to become.” Source: RevenueBase Database · checked Sep 22, 2026
12	Fewer Harrington & Partners	Indirect evidence	Waterford, IrelandHQ checked Sep 22, 2026	11-50	32 contacts →
	Indirect evidence “Fewer Harrington & Partners (FHP) was formed in 1975 by Nicky Fewer.” Source: RevenueBase Database · checked Sep 22, 2026
13	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
14	Lawler Consulting	Indirect evidence	Kilkenny, IrelandHQ checked Sep 22, 2026	11-50	28 contacts →
	Indirect evidence “Lawler Consulting is a multi-disciplinary team of highly qualified Building Services Engineers with offices in Ireland and the U.K.” Source: RevenueBase Database · checked Sep 22, 2026
15	Hayes Higgins Partnership	Indirect evidence	Kilkenny, IrelandHQ checked Sep 22, 2026	11-50	26 contacts →
	Indirect evidence “Hayes Higgins Partnership is a multidisciplinary consulting engineering practice employing 38 staff in Dublin, Kilkenny & London.” Source: RevenueBase Database · checked Sep 22, 2026
16	VHA	Indirect evidence	Sligo, IrelandHQ checked Sep 22, 2026	11-50	25 contacts →
	Indirect evidence “Since the founding of VHA Architects in 1986 by Vincent Hannon, we have been privileged to form long-term relationships with many of the nation’s most distinguished developers…” Source: RevenueBase Database · checked Sep 22, 2026
17	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
18	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
19	Burke-Kennedy Doyle Architects	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	21 contacts →
	Partial evidence “Burke-Kennedy Doyle Architects is one of Ireland’s leading architectural practices and has been a key player in the provision of innovative and professional architectural design…” Source: RevenueBase Database · checked Sep 22, 2026
20	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
21	JSA Architects Ireland	Indirect evidence	Co. Dublin, IrelandHQ checked Sep 22, 2026	11-50	20 contacts →
	Indirect evidence “JSA Architects is an Irish based practice established in 1983 with an office in Romania.” Source: RevenueBase Database · checked Sep 22, 2026
22	Antaris Consulting	Strong evidence	Limerick, IrelandHQ checked Sep 22, 2026	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 22, 2026
23	CJ Falconer Architects	Indirect evidence	Waterford, IrelandHQ checked Sep 22, 2026	11-50	19 contacts →
	Indirect evidence “C.J.” Source: RevenueBase Database · checked Sep 22, 2026
24	Plan Energy	Indirect evidence	Sligo, IrelandHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “Welcome to Plan Energy, your trusted partner in decarbonisation and renewable energy.” Source: RevenueBase Database · checked Sep 22, 2026
25	Taylor Mccarney Architects	Strong evidence	Saleen Castlebar, IrelandHQ checked Sep 22, 2026	11-50	17 contacts →
	Strong evidence “Founded in 1966, Taylor McCarney Architects are one of Ireland’s leading design consultancies employing more than 40 experienced and forward thinking staff.” 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: sustainable design consultants. 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 sustainable design consultants.
Partial evidence: Its own public description names part of sustainable design consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable design consultants. 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 180 sustainable design consultants based in Ireland

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Sustainable design consultants based in Ireland at a glance

As of Sep 22, 2026

46.9%Verified-email coverage

13.9Average contacts per company

1-10Median size (employees)

20.6%Largest-city concentration · Dublin

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

107

11-50

51-200

201-500

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 180 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 sustainable design consultants, 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 “sustainable design consultants”. 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 sustainable design consultants), 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 sustainable design consultants, 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, 1,172 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.

Sustainable design consultants by metro

Sustainable design consultants in Dublin37

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 sustainable design consultants, 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 sustainable design consultants are there based in Ireland?

RevenueBase identified 180 sustainable design consultants 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 sustainable design consultants?

Dublin leads with 37 headquartered companies, followed by Cork (11) and Limerick (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 1,172 verified decision-maker contacts tracked across these 180 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.