Company lists · Data refreshed September 2026

Top 25 Carbon neutral contractors based in Ireland

Name: Carbon neutral 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 208 companies tracked

RevenueBase identified 208 carbon neutral contractors headquartered in Ireland as of September 2026 and tracks 5,384 professional contacts across them, including 1,680 with verified work emails. Dublin is the largest hub.

This list covers carbon neutral 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

208Companies

5,384Contacts tracked

1,680Verified emails

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The 25 largest carbon neutral contractors based in Ireland

Ranked by team size

Top 25 of 208 carbon neutral 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 carbon neutral 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	Nicholas O'dwyer LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
2	ORS	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	51-200	270 contacts →
	Indirect evidence “Since 1991, ORS has led the way in anticipating and responding to diverse client requirements in the construction industry.” Source: RevenueBase Database · checked Sep 16, 2026
3	O'connor Sutton Cronin	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	201-500	241 contacts →
	Indirect evidence “OCSC is an established International Multidisciplinary Consulting Engineering & Project Management Practice.” Source: RevenueBase Database · checked Sep 16, 2026
4	Elliott Group	Indirect evidence	Cavan, IrelandHQ checked Sep 16, 2026	201-500	239 contacts →
	Indirect evidence “Construction has always been a pivotal part of the Elliott family.” Source: RevenueBase Database · checked Sep 16, 2026
5	Dbfl Consulting Engineers LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	51-200	178 contacts →
	Indirect 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 16, 2026
6	Tritech Engineering	Indirect evidence	Dublin 22, IrelandHQ checked Sep 16, 2026	201-500	173 contacts →
	Indirect 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
7	Fehily Timoney And Company	Indirect evidence	Cork, IrelandHQ checked Sep 16, 2026	51-200	116 contacts →
	Indirect 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 16, 2026
8	In2 Engineering	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
9	Tandem Project Management LTD	Partial evidence	Blackrock, IrelandHQ checked Sep 16, 2026	51-200	65 contacts →
	Partial 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
10	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
11	Kilcawley Construction	Indirect evidence	Sligo, IrelandHQ checked Sep 16, 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 16, 2026
12	Metec Consulting Engineers	Indirect evidence	Bray, IrelandHQ checked Sep 16, 2026	51-200	56 contacts →
	Indirect evidence “Reshaping the way you think about building performance since 2007.” Source: RevenueBase Database · checked Sep 16, 2026
13	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
14	Garland	Indirect evidence	Rathmines, IrelandHQ checked Sep 16, 2026	51-200	50 contacts →
	Indirect evidence “GARLAND is an international consulting engineering firm.” Source: RevenueBase Database · checked Sep 16, 2026
15	Axiseng	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 16, 2026
16	Climeaction	Partial evidence	Cork, IrelandHQ checked Sep 16, 2026	11-50	42 contacts →
	Partial 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
17	Eireng Consulting Engineers LTD	Indirect evidence	Blackrock, IrelandHQ checked Sep 16, 2026	11-50	38 contacts →
	Indirect 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 16, 2026
18	KSN Energy	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	51-200	32 contacts →
	Indirect evidence “Complex operations made simple.” Source: RevenueBase Database · checked Sep 16, 2026
19	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
20	Lawler Consulting	Indirect evidence	Kilkenny, IrelandHQ checked Sep 16, 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 16, 2026
21	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
22	VHA	Indirect evidence	Sligo, IrelandHQ checked Sep 16, 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 16, 2026
23	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
24	Enviroguide A DNV Company	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 2026	11-50	22 contacts →
	Indirect evidence “Enviroguide Consulting has an established reputation for delivering environmental and sustainability consultancy services including ecology, environmental impact assessment…” Source: RevenueBase Database · checked Sep 16, 2026
25	Burke-Kennedy Doyle Architects	Indirect evidence	Dublin, IrelandHQ checked Sep 16, 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 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: carbon neutral 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 carbon neutral contractors.
Partial evidence: Its own public description names part of carbon neutral contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon neutral 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 208 carbon neutral contractors based in Ireland

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Carbon neutral contractors based in Ireland at a glance

As of Sep 16, 2026

31.2%Verified-email coverage

25.9Average contacts per company

1-10Median size (employees)

22.6%Largest-city concentration · Dublin

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

104

11-50

51-200

201-500

1,001-5,000

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 208 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 carbon neutral 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 “carbon neutral 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 carbon neutral 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 carbon neutral 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, 1,680 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.

Carbon neutral contractors by metro

Carbon neutral contractors in Dublin47

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 carbon neutral 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 carbon neutral contractors are there based in Ireland?

RevenueBase identified 208 carbon neutral 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?

Nicholas O'dwyer LTD, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most carbon neutral contractors?

Dublin leads with 47 headquartered companies, followed by Cork (13) and Limerick (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 1,680 verified decision-maker contacts tracked across these 208 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.