Company lists · Data refreshed September 2026

Top 25 Sustainable design firms based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 204 companies tracked

RevenueBase identified 204 sustainable design firms headquartered in Ireland as of September 2026 and tracks 3,271 professional contacts across them, including 1,738 with verified work emails. Dublin is the largest hub.

This list covers sustainable design 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 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

204Companies

3,271Contacts tracked

1,738Verified emails

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The 25 largest sustainable design firms based in Ireland

Ranked by team size

Top 25 of 204 sustainable design firms 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 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	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
2	MKO	Indirect evidence	Galway, IrelandHQ checked Sep 22, 2026	201-500	210 contacts →
	Indirect evidence “MKO is Ireland’s largest Planning and Environmental consultancy.” Source: RevenueBase Database · checked Sep 22, 2026
3	Dbfl Consulting Engineers LTD	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	178 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 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	Partial evidence	Cork, IrelandHQ checked Sep 22, 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 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	AWN Consulting LTD	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	74 contacts →
	Partial 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 22, 2026
8	MCA Architects	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	72 contacts →
	Partial evidence “MCA Architects and TTSP HWP have joined forces to form a fully integrated, pan-European leader in data centre design, engineering, and project delivery.” Source: RevenueBase Database · checked Sep 22, 2026
9	Coady Architects	Partial evidence	Dublin 6, IrelandHQ checked Sep 22, 2026	51-200	64 contacts →
	Partial evidence “Designing with Purpose: Shaping the Future of Living, Learning, Working, and Wellbeing.” Source: RevenueBase Database · checked Sep 22, 2026
10	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
11	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
12	Mccauley Daye O'connell Architects	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	45 contacts →
	Indirect evidence “With invaluable architectural experience spanning over a range of sectors including commercial, offices, residential, leisure and retail we can confidently offer a large selection…” Source: RevenueBase Database · checked Sep 22, 2026
13	TOT Architects	Indirect evidence	Dublin 2, IrelandHQ checked Sep 22, 2026	11-50	40 contacts →
	Indirect evidence “TOT Architects is one of the most dynamic architectural practices in the country.” Source: RevenueBase Database · checked Sep 22, 2026
14	Eireng Consulting Engineers LTD	Partial evidence	Blackrock, IrelandHQ checked Sep 22, 2026	11-50	38 contacts →
	Partial evidence “EirEng Consulting Engineers is a firm of highly experienced and motivated Civil and Structural Design Engineers with offices in Ireland and the UK, dedicated to providing cutting…” Source: RevenueBase Database · checked Sep 22, 2026
15	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
16	Urban Agency	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	51-200	32 contacts →
	Indirect evidence “URBAN AGENCY is an award-winning architecture firm with a broad international profile.” Source: RevenueBase Database · checked Sep 22, 2026
17	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
18	CDP Architecture	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	31 contacts →
	Indirect evidence “We provide professional architectural services and support to our clients.” Source: RevenueBase Database · checked Sep 22, 2026
19	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
20	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
21	Healy Partners Architects	Indirect evidence	Limerick, IrelandHQ checked Sep 22, 2026	11-50	23 contacts →
	Indirect evidence “Healy Partners Architects is an established architectural practice based in Limerick City.” Source: RevenueBase Database · checked Sep 22, 2026
22	Enviroguide A DNV Company	Partial evidence	Dublin, IrelandHQ checked Sep 22, 2026	11-50	22 contacts →
	Partial 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
23	RUA Architects	Partial evidence	Kinsale, IrelandHQ checked Sep 22, 2026	1-10	22 contacts →
	Partial evidence “GOOD DESIGN SHOULDN'T COST THE EARTH" Award winning RUA Architects have turned their focus to research and learning.” Source: RevenueBase Database · checked Sep 22, 2026
24	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
25	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

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 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 sustainable design firms.
Partial evidence: Its own public description names part of sustainable design firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable design 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 204 sustainable design firms based in Ireland

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Sustainable design firms based in Ireland at a glance

As of Sep 22, 2026

53.1%Verified-email coverage

16.0Average contacts per company

1-10Median size (employees)

22.5%Largest-city concentration · Dublin

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

119

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 204 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 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 “sustainable design 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 sustainable design 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 sustainable design 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, 1,738 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 firms by metro

Sustainable design firms in Dublin46

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 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 sustainable design firms are there based in Ireland?

RevenueBase identified 204 sustainable design 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 Dublin, tops this list with the largest team on record.

Which city has the most sustainable design firms?

Dublin leads with 46 headquartered companies, followed by Cork (10) 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 1,738 verified decision-maker contacts tracked across these 204 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.