Company lists · Data refreshed September 2026

Top 25 Green building system contractors based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 56 companies tracked

RevenueBase identified 56 green building system contractors headquartered in Ireland as of September 2026 and tracks 53,471 professional contacts across them, including 7,076 with verified work emails. Dublin is the largest hub.

This list covers green building system contractors 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 16, 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 16, 2026 86% judged on-target in blind review

56Companies

53,471Contacts tracked

7,076Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest green building system contractors based in Ireland

Ranked by team size

Top 25 of 56 green building system contractors based in Ireland, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to green building system contractors: 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	Johnson Controls	Strong evidence	Cork, IrelandHQ checked Sep 16, 2026	10001+	52,736 contacts →
	Strong evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 16, 2026
2	Tritech Engineering	Partial evidence	Dublin 22, IrelandHQ checked Sep 16, 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 16, 2026
3	Dominic O'connor LTD	Strong evidence	Loughrea, IrelandHQ checked Sep 16, 2026	51-200	55 contacts →
	Strong evidence “Dominic O'Connor Ltd are a progressive mechanical building services contractor based in the Loughrea, Co.” Source: RevenueBase Database · checked Sep 16, 2026
4	Mosart	Partial evidence	IrelandHQ checked Sep 16, 2026	11-50	17 contacts →
	Partial evidence “Providing expert design, energy consulting & training in high performance buildings since 1993.” Source: RevenueBase Database · checked Sep 16, 2026
5	Symphony Energy	Indirect evidence	Wicklow, IrelandHQ checked Sep 16, 2026	11-50	17 contacts →
	Indirect evidence “Symphony Energy is a global leader in optimising energy performance in the commercial built environment.” Source: RevenueBase Database · checked Sep 16, 2026
6	Passive Dynamics	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
7	Frontline Energy	Indirect evidence	Dublin 4, IrelandHQ checked Sep 16, 2026	11-50	15 contacts →
	Indirect evidence “We are energy innovators and pride ourselves in delivering an end to end range of expertise for the built environment that saves energy, carbon, time and cost.” Source: RevenueBase Database · checked Sep 16, 2026
8	Systemcore	Partial evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	15 contacts →
	Partial 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 16, 2026
9	ENCON	Partial evidence	Waterford, IrelandHQ checked Sep 16, 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 16, 2026
10	Coolair LTD	Partial evidence	Dublin 24, IrelandHQ checked Sep 16, 2026	11-50	14 contacts →
	Partial evidence “Established in 1970, Coolair have over 40 years market leading experience in the supply, installation, service and maintenance of HVAC Systems.” Source: RevenueBase Database · checked Sep 16, 2026
11	Blanchfield Heating	Indirect evidence	Kilkenny, IrelandHQ checked Sep 16, 2026	11-50	13 contacts →
	Indirect evidence “Blanchfield Heating was established in 1994 as a private owned business with a flexible client-focused approach and an appreciation of long term business relationships.” Source: RevenueBase Database · checked Sep 16, 2026
12	ENX	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	13 contacts →
	Indirect evidence “Mechanical, Electrical and Sustainability Consulting Engineers” Source: RevenueBase Database · checked Sep 16, 2026
13	ICONS	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	13 contacts →
	Indirect evidence “Our working lives are constantly being transformed by new thinking and new technology.” Source: RevenueBase Database · checked Sep 16, 2026
14	Entropic	Partial evidence	Maynooth, IrelandHQ checked Sep 16, 2026	11-50	12 contacts →
	Partial evidence “Entropic provide low energy, long life, air conditioning systems for indoor environments.” Source: RevenueBase Database · checked Sep 16, 2026
15	Intelligent Building Controls LTD	Strong evidence	Oak Close, IrelandHQ checked Sep 16, 2026	1-10	9 contacts →
	Strong evidence “Intelligent Building Controls Ltd.(IBC) is an Irish owned business-to-business value added distributor of energy saving building management systems and controllers, founded in…” Source: RevenueBase Database · checked Sep 16, 2026
16	Mccool Controls & Engineering	Partial evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “McCool Controls & Engineering's (MC3E) mission is to provide specialist Control Systems, with excellent service from design to conclusion, and to ensure optimum performance of the…” Source: RevenueBase Database · checked Sep 16, 2026
17	Ecohouse Developments Limited	Partial evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
18	Synergy Engineering LTD	Partial evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “Synergy Engineering Limited (SEL) specializes in the design and development of building services, delivering innovative engineering solutions for commercial, retail, and…” Source: RevenueBase Database · checked Sep 16, 2026
19	DND Group	Partial evidence	Ballycoolin, IrelandHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “About Us At DND Group, we are not just a facilities and Building Services company; we are the architects of seamless, sustainable, and electrifying environments.” Source: RevenueBase Database · checked Sep 16, 2026
20	Apex Controls Limited	Partial evidence	Sligo, IrelandHQ checked Sep 16, 2026	51-200	4 contacts →
	Partial evidence “REFRIGERATION We design, supply and fit, efficient cost-saving refrigeration systems that not only meet your needs but also help you save on energy costs.” Source: RevenueBase Database · checked Sep 16, 2026
21	Scott Group Smart Buildings	Indirect evidence	Raheny, IrelandHQ checked Sep 16, 2026	11-50	3 contacts →
	Indirect evidence “Specialties- Development & implementation of renewable energy & energy efficiency projects • Strategy development & investment planning • Energy savings planning & retrofits •…” Source: RevenueBase Database · checked Sep 16, 2026
22	Hussey Architects	Partial evidence	Dublin 4, IrelandHQ checked Sep 16, 2026	1-10	3 contacts →
	Partial evidence “Our focus is on designing simple sustainable buildings that respect their context.” Source: RevenueBase Database · checked Sep 16, 2026
23	Comfort Solutions Retrofit	Indirect evidence	Newport, IrelandHQ checked Sep 16, 2026	11-50	3 contacts →
	Indirect evidence “We bring warmth, comfort and fresh air to your home or business with a keen emphasis on performance and quality.” Source: RevenueBase Database · checked Sep 16, 2026
24	Geraghty Energy Consultants LTD	Indirect evidence	Dublin 7, IrelandHQ checked Sep 16, 2026	1-10	3 contacts →
	Indirect evidence “We at Geraghty Energy Consultants Ltd.” Source: RevenueBase Database · checked Sep 16, 2026
25	Passive House Plus	Strong evidence	Dublin, IrelandHQ checked Sep 16, 2026	1-10	3 contacts →
	Strong evidence “The leading green building magazine in the UK and Ireland, Passive House Plus is a bimonthly, editorially-led title set up to help design professionals, contractors & clients…” Source: RevenueBase Database · checked Sep 16, 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 system contractors. 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 system contractors.
Partial evidence: Its own public description names part of green building system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name green building system contractors. 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 56 green building system contractors based in Ireland

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 7,076 reachable decision-makers.

Free signup · no credit card

View the full list →

Green building system contractors based in Ireland at a glance

As of Sep 16, 2026

13.2%Verified-email coverage

954.8Average contacts per company

11-50Median size (employees)

26.8%Largest-city concentration · Dublin

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

10001+

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 56 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 system contractors, 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 system contractors”. 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 system contractors), 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 system contractors, 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, 7,076 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 16, 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 system contractors, 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 system contractors are there based in Ireland?

RevenueBase identified 56 green building system contractors 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?

Johnson Controls, headquartered in Milwaukee, tops this list with the largest team on record.

Which city has the most green building system contractors?

Dublin leads with 15 headquartered companies, followed by Ashbourne (1) and Ballymount (1).

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 7,076 verified decision-maker contacts tracked across these 56 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 16, 2026.

Ready to reach these companies? Verified emails and direct dials for all 56 green building system contractors based in Ireland. Start with a free account, no credit card.

Download this list →

Related lists

Green building system contractors by geography

Browse the directory

Browse: Companies home · All Ireland lists · All Green building system contractors lists · New lists

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.