Company lists · Data refreshed September 2026

Top 25 Green building companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 15, 2026 84 companies tracked

RevenueBase identified 84 green building companies headquartered in Ireland as of September 2026 and tracks 694 professional contacts across them, including 356 with verified work emails. Dublin is the largest hub.

This list covers green building 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 15, 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 15, 2026 86% judged on-target in blind review

84Companies

694Contacts tracked

356Verified emails

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The 25 largest green building companies based in Ireland

Ranked by team size

Top 25 of 84 green building companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 15, 2026. RevenueBase Smart Search rates how each company's information relates to green building 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	In2 Engineering	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	51-200	100 contacts →
	Partial 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 15, 2026
2	Kilcawley Construction	Indirect evidence	Sligo, IrelandHQ checked Sep 15, 2026	51-200	56 contacts →
	Indirect evidence “Kilcawley Construction provide comprehensive construction services in a wide range of sectors including commercial, educational, pharmaceutical, healthcare, hospitality…” Source: RevenueBase Database · checked Sep 15, 2026
3	TOT Architects	Indirect evidence	Dublin 2, IrelandHQ checked Sep 15, 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 15, 2026
4	VHA	Indirect evidence	Sligo, IrelandHQ checked Sep 15, 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 15, 2026
5	Burke-Kennedy Doyle Architects	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 2026	51-200	21 contacts →
	Indirect 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 15, 2026
6	KSN Horizon	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 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 15, 2026
7	JSA Architects Ireland	Indirect evidence	Co. Dublin, IrelandHQ checked Sep 15, 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 15, 2026
8	Michael Fitzpatrick Architects	Indirect evidence	Cavan, IrelandHQ checked Sep 15, 2026	11-50	19 contacts →
	Indirect evidence “Michael Fitzpatrick Architects Ltd are RIAI registered Architects with the Royal Institute of the Architects of Ireland.” Source: RevenueBase Database · checked Sep 15, 2026
9	CJ Falconer Architects	Indirect evidence	Waterford, IrelandHQ checked Sep 15, 2026	11-50	19 contacts →
	Indirect evidence “C.J.” Source: RevenueBase Database · checked Sep 15, 2026
10	Mosart	Partial evidence	IrelandHQ checked Sep 15, 2026	11-50	17 contacts →
	Partial evidence “Providing expert design, energy consulting & training in high performance buildings since 1993.” Source: RevenueBase Database · checked Sep 15, 2026
11	FKP Architects	Indirect evidence	Dublin 2, IrelandHQ checked Sep 15, 2026	11-50	16 contacts →
	Indirect evidence “FKP Architects is a Dublin-based firm practicing Architecture and project management.” Source: RevenueBase Database · checked Sep 15, 2026
12	Passive Dynamics	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 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 15, 2026
13	Systemcore	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	15 contacts →
	Indirect evidence “We are the next generation of M&E consulting engineers, dedicated to designing systems for low-carbon, intelligent, self-optimising spaces that enhance occupant well-being, and…” Source: RevenueBase Database · checked Sep 15, 2026
14	ENCON	Partial evidence	Waterford, IrelandHQ checked Sep 15, 2026	11-50	14 contacts →
	Partial evidence “Encon is a sustainable building, retrofit, and renewables company committed to transforming how Ireland builds, renovates, and powers its spaces.” Source: RevenueBase Database · checked Sep 15, 2026
15	Mcoh Architects	Indirect evidence	Portlaoise, IrelandHQ checked Sep 15, 2026	11-50	14 contacts →
	Indirect evidence “MCOH Architects was established in 1981 by our Partners, Patrick O'Hora FBEng FIAA MRIAI MRIBA.” Source: RevenueBase Database · checked Sep 15, 2026
16	Wilson Architecture Ommw	Indirect evidence	Cork, IrelandHQ checked Sep 15, 2026	11-50	13 contacts →
	Indirect evidence “With over 35 years of experience, Wilson Architecture is one of Ireland’s leading award winning Architectural firms.” Source: RevenueBase Database · checked Sep 15, 2026
17	ENX	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	13 contacts →
	Indirect evidence “Mechanical, Electrical and Sustainability Consulting Engineers” Source: RevenueBase Database · checked Sep 15, 2026
18	JAK Consulting Engineers	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 2026	11-50	12 contacts →
	Indirect evidence “JAK Consulting Engineers is a leading multi-award winning MEP design and sustainable energy consultancy firm in Ireland, UK, Middle East and Asia.” Source: RevenueBase Database · checked Sep 15, 2026
19	Ceardean Architects LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 15, 2026	1-10	12 contacts →
	Indirect evidence “Ceardean is a collaborative of experienced designers and specialist consultants with a shared ethos of skilled making and design collaboration.” Source: RevenueBase Database · checked Sep 15, 2026
20	DON O' Malley & Partners Consulting Engineers. Est. 1967	Partial evidence	Limerick, IrelandHQ checked Sep 15, 2026	11-50	11 contacts →
	Partial evidence “Don O'Malley & Partners was established in 1967 and is one of Ireland’s leading Consulting Engineering Practices in Building Services Engineering.” Source: RevenueBase Database · checked Sep 15, 2026
21	Meehan Green, A KEO Company	Strong evidence	Dublin, IrelandHQ checked Sep 15, 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 15, 2026
22	Helena Mcelmeel Architects	Partial evidence	Galway, IrelandHQ checked Sep 15, 2026	1-10	9 contacts →
	Partial evidence “Architecture - Interiors - Low Energy / Passive Building - Public Realm / Urban Design” Source: RevenueBase Database · checked Sep 15, 2026
23	BFA Consulting	Indirect evidence	Bray, IrelandHQ checked Sep 15, 2026	1-10	8 contacts →
	Indirect evidence “At BFA Consulting, we are passionate about sustainability.” Source: RevenueBase Database · checked Sep 15, 2026
24	Ecohouse Developments Limited	Partial evidence	Dublin, IrelandHQ checked Sep 15, 2026	51-200	8 contacts →
	Partial evidence “We are a tight knit in‐house team of designers, architects and builders, committed to creating beautiful, energy efficient homes and buildings, working towards a passive standard.” Source: RevenueBase Database · checked Sep 15, 2026
25	Dhbarchitects LTD	Indirect evidence	Waterford, IrelandHQ checked Sep 15, 2026	1-10	7 contacts →
	Indirect evidence “dhb architects is a design-led, RIAI registered practice based in Waterford City.” Source: RevenueBase Database · checked Sep 15, 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: green building 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 green building companies.
Partial evidence: Its own public description names part of green building companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name green building 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 84 green building companies based in Ireland

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Green building companies based in Ireland at a glance

As of Sep 15, 2026

51.3%Verified-email coverage

8.3Average contacts per company

1-10Median size (employees)

23.8%Largest-city concentration · Dublin

Sep 15, 2026Page data refreshed

Companies by employee count

1-10

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 84 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 green building 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 “green building 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 green building 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 green building 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, 356 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 15, 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.

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 green building 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 green building companies are there based in Ireland?

RevenueBase identified 84 green building 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?

In2 Engineering, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most green building companies?

Dublin leads with 20 headquartered companies, followed by Cork (3) and Galway (2).

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 356 verified decision-maker contacts tracked across these 84 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 15, 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.