Company lists · Data refreshed September 2026

Top 25 Building decarbonization companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 150 companies tracked

RevenueBase identified 150 building decarbonization companies headquartered in Ireland as of September 2026 and tracks 54,709 professional contacts across them, including 7,820 with verified work emails. Dublin is the largest hub.

This list covers building decarbonization 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 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

150Companies

54,709Contacts tracked

7,820Verified emails

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The 25 largest building decarbonization companies based in Ireland

Ranked by team size

Top 25 of 150 building decarbonization companies 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 building decarbonization 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	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	In2 Engineering	Partial evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
4	Catalyst	Indirect evidence	Dublin 4, IrelandHQ checked Sep 16, 2026	51-200	99 contacts →
	Indirect evidence “We are a multi-disciplinary ESG, Technical Advisory and digitalisation consultancy with specialist expertise in the real estate, property and construction sectors.” Source: RevenueBase Database · checked Sep 16, 2026
5	Astatine LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	51-200	90 contacts →
	Indirect evidence “Astatine is a leading innovator in energy and C02 reduction solutions, particularly in the decarbonisation of industrial high - grade heat (incl.” Source: RevenueBase Database · checked Sep 16, 2026
6	Em3	Indirect evidence	Limerick, IrelandHQ checked Sep 16, 2026	51-200	87 contacts →
	Indirect evidence “EM3 is an industrial energy engineering and advisory partner We work with energy-intensive organisations to drive efficiencies, reduce energy costs, and deliver on decarbonisation…” Source: RevenueBase Database · checked Sep 16, 2026
7	Ecocem Global	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	201-500	65 contacts →
	Indirect evidence “Ecocem is a pioneer in low-carbon cement solutions, enabling the decarbonisation of one of the world’s most essential industries.” Source: RevenueBase Database · checked Sep 16, 2026
8	Tandem Project Management LTD	Indirect evidence	Blackrock, IrelandHQ checked Sep 16, 2026	51-200	65 contacts →
	Indirect 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 16, 2026
9	SE Systems	Indirect evidence	Cork, IrelandHQ checked Sep 16, 2026	51-200	59 contacts →
	Indirect evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 16, 2026
10	Varming Consulting Engineers LTD	Indirect evidence	Dundrum, IrelandHQ checked Sep 16, 2026	11-50	55 contacts →
	Indirect 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 16, 2026
11	Axiseng	Partial evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	47 contacts →
	Partial 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 16, 2026
12	Climeaction	Indirect evidence	Cork, IrelandHQ checked Sep 16, 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 16, 2026
13	Ashgrove Renewables	Indirect evidence	Cork, IrelandHQ checked Sep 16, 2026	51-200	33 contacts →
	Indirect evidence “We take great pride in our data-driven, scientific approach to energy solutions, spearheaded by a team known for its experience and creative design skills.” Source: RevenueBase Database · checked Sep 16, 2026
14	Coolsivna Construction LTD	Indirect evidence	Mount Bellew Bridge, IrelandHQ checked Sep 16, 2026	201-500	31 contacts →
	Indirect evidence “Coolsivna Construction is a young vibrant construction company providing reliable, efficient, hands on service for medium to large sized construction projects.” Source: RevenueBase Database · checked Sep 16, 2026
15	Verde Energy Group	Indirect evidence	Little Island, IrelandHQ checked Sep 16, 2026	11-50	31 contacts →
	Indirect evidence “Verde Energy Group Delivering energy cost savings and carbon reduction solutions to Commercial & Industrial businesses since 2009.” Source: RevenueBase Database · checked Sep 16, 2026
16	Lawler Consulting	Partial evidence	Kilkenny, IrelandHQ checked Sep 16, 2026	11-50	28 contacts →
	Partial 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 16, 2026
17	Hayes Higgins Partnership	Indirect evidence	Kilkenny, IrelandHQ checked Sep 16, 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 16, 2026
18	Horizon Energy Group HEG	Indirect evidence	Cork, IrelandHQ checked Sep 16, 2026	11-50	26 contacts →
	Indirect evidence “Horizon Energy Group delivers technology-led solutions that reduce energy costs, cut carbon and unlock new revenue opportunities.” Source: RevenueBase Database · checked Sep 16, 2026
19	Lawler Sustainability	Indirect evidence	Kilkenny, IrelandHQ checked Sep 16, 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 16, 2026
20	Urbanvolt	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	23 contacts →
	Indirect evidence “UrbanVolt is a global leader in financing decarbonised solutions for businesses, helping companies achieve their sustainability goals through innovative energy solutions.” Source: RevenueBase Database · checked Sep 16, 2026
21	KSN Horizon	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
22	House 2 Home Retrofit LTD	Indirect evidence	Dublin 12, IrelandHQ checked Sep 16, 2026	11-50	20 contacts →
	Indirect evidence “House 2 Home has been Ireland's leading 'one stop shop' for energy upgrades since 2013.” Source: RevenueBase Database · checked Sep 16, 2026
23	Plan Energy	Indirect evidence	Sligo, IrelandHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “Welcome to Plan Energy, your trusted partner in decarbonisation and renewable energy.” Source: RevenueBase Database · checked Sep 16, 2026
24	Clean Energy Ireland	Indirect evidence	Aherla, IrelandHQ checked Sep 16, 2026	11-50	18 contacts →
	Indirect evidence “We offer customers the best products, services and advice to help lower energy costs and reduce their carbon footprint.” Source: RevenueBase Database · checked Sep 16, 2026
25	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

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: building decarbonization 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 building decarbonization companies.
Partial evidence: Its own public description names part of building decarbonization companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building decarbonization 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 150 building decarbonization companies based in Ireland

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Building decarbonization companies based in Ireland at a glance

As of Sep 16, 2026

14.3%Verified-email coverage

364.7Average contacts per company

11-50Median size (employees)

21.3%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 150 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 building decarbonization 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 “building decarbonization 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 building decarbonization 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 building decarbonization 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, 7,820 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.

Building decarbonization companies by metro

Building decarbonization companies in Dublin32

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 building decarbonization 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 building decarbonization companies are there based in Ireland?

RevenueBase identified 150 building decarbonization 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?

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

Which city has the most building decarbonization companies?

Dublin leads with 32 headquartered companies, followed by Cork (10) and Galway (5).

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 7,820 verified decision-maker contacts tracked across these 150 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.

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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.