Company lists · Data refreshed September 2026

Top 24 Retrofit contractors based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 94 companies tracked

RevenueBase identified 94 retrofit contractors headquartered in Ireland as of September 2026 and tracks 53,515 professional contacts across them, including 7,160 with verified work emails. Dublin is the largest hub.

This list covers retrofit 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 17, 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 17, 2026 86% judged on-target in blind review

94Companies

53,515Contacts tracked

7,160Verified emails

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The 24 largest retrofit contractors based in Ireland

Ranked by team size

Top 24 of 94 retrofit contractors based in Ireland, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to retrofit 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	Indirect evidence	Cork, IrelandHQ checked Sep 17, 2026	10001+	52,736 contacts →
	Indirect evidence “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Source: RevenueBase Database · checked Sep 17, 2026
2	SE Systems	Indirect evidence	Cork, IrelandHQ checked Sep 17, 2026	51-200	59 contacts →
	Indirect evidence “SE Systems (Sustainable Energy Systems) is Ireland's leading energy solutions provider.” Source: RevenueBase Database · checked Sep 17, 2026
3	Lynskey Engineering LTD	Indirect evidence	Dublin 10, IrelandHQ checked Sep 17, 2026	51-200	47 contacts →
	Indirect evidence “Lynskey Engineering Limited provide a wide scope of Mechanical Building Services covering commercial, industrial, process and mixed use developments.” Source: RevenueBase Database · checked Sep 17, 2026
4	Energystore	Indirect evidence	Holywood, IrelandHQ checked Sep 17, 2026	51-200	44 contacts →
	Indirect evidence “Energystore is rethinking construction with free-flowing insulation.” Source: RevenueBase Database · checked Sep 17, 2026
5	Electric Ireland Superhomes	Partial evidence	Thurles, IrelandHQ checked Sep 17, 2026	11-50	43 contacts →
	Partial evidence “Electric Ireland Superhomes is a One Stop Shop which looks after all the key stages of a home energy retrofit, from retrofit design through to project completion and management of…” Source: RevenueBase Database · checked Sep 17, 2026
6	Ashgrove Renewables	Indirect evidence	Cork, IrelandHQ checked Sep 17, 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 17, 2026
7	Verde Energy Group	Indirect evidence	Little Island, IrelandHQ checked Sep 17, 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 17, 2026
8	Alfa Electrical LTD	Partial evidence	Dublin 12, IrelandHQ checked Sep 17, 2026	51-200	25 contacts →
	Partial evidence “Alfa Electrical is one of Ireland's leading electrical engineering contractors, delivering high-quality commercial, industrial, residential and retail projects nationwide.” Source: RevenueBase Database · checked Sep 17, 2026
9	House 2 Home Retrofit LTD	Indirect evidence	Dublin 12, IrelandHQ checked Sep 17, 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 17, 2026
10	Energlaze Home Energy Upgrades	Indirect evidence	Wexford, IrelandHQ checked Sep 17, 2026	11-50	17 contacts →
	Indirect evidence “At Energlaze Home Energy Upgrades, not only are we committed to improving the overall comfort of your home, but we are also focused on reducing your energy costs and can help you…” Source: RevenueBase Database · checked Sep 17, 2026
11	Symphony Energy	Indirect evidence	Wicklow, IrelandHQ checked Sep 17, 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 17, 2026
12	RGN Electrical & Communications LTD	Indirect evidence	Osberstown, IrelandHQ checked Sep 17, 2026	11-50	16 contacts →
	Indirect evidence “RGN Specialises in retro-fit School, Commerical, and industrial fit outs” Source: RevenueBase Database · checked Sep 17, 2026
13	Frontline Energy	Indirect evidence	Dublin 4, IrelandHQ checked Sep 17, 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 17, 2026
14	Breffni Insulation	Indirect evidence	Kilnaleck, IrelandHQ checked Sep 17, 2026	11-50	14 contacts →
	Indirect evidence “Breffni Insulation was founded in 2006 and the company is registered and compliant with standards as per the National Standards Authority of Ireland (NSAI), Sustainable Energy…” Source: RevenueBase Database · checked Sep 17, 2026
15	NRG Panel	Indirect evidence	Castleblayney, IrelandHQ checked Sep 17, 2026	51-200	14 contacts →
	Indirect evidence “NRG Panel are one of Ireland's leading installers of solar panels and air to water heat pumps.” Source: RevenueBase Database · checked Sep 17, 2026
16	ENCON	Partial evidence	Waterford, IrelandHQ checked Sep 17, 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 17, 2026
17	Cooper Insulation LTD	Indirect evidence	Kells, IrelandHQ checked Sep 17, 2026	11-50	12 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
18	Blackwell Energy	Partial evidence	Dublin 6, IrelandHQ checked Sep 17, 2026	51-200	9 contacts →
	Partial evidence “Blackwell Energy design, supply & install home and business energy services such as solar PV, air source heat pumps, retrofit underfloor heating, air conditioning, deep retrofit…” Source: RevenueBase Database · checked Sep 17, 2026
19	Envirobead LTD	Indirect evidence	Cork, IrelandHQ checked Sep 17, 2026	11-50	9 contacts →
	Indirect evidence “Your #OneStopShop SEAI approved specialists with complete home energy upgrade solutions.” Source: RevenueBase Database · checked Sep 17, 2026
20	Integrate Home Energy Upgrades	Partial evidence	Newtownmountkennedy, IrelandHQ checked Sep 17, 2026	1-10	8 contacts →
	Partial evidence “Integrate Home Energy Upgrades is a One-Stop-Shop retrofit service provider based in Wicklow town.” Source: RevenueBase Database · checked Sep 17, 2026
21	Ecohouse Developments Limited	Indirect evidence	Dublin, IrelandHQ checked Sep 17, 2026	51-200	8 contacts →
	Indirect 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 17, 2026
22	ECO Energy Improvements	Partial evidence	Dundalk, IrelandHQ checked Sep 17, 2026	11-50	7 contacts →
	Partial evidence “Eco Energy Improvements are leading specialists in renewable energy retrofitting solutions with over 20 years of experience.” Source: RevenueBase Database · checked Sep 17, 2026
23	Vivid Edge	Indirect evidence	Ucd Belfield Dublin 4, IrelandHQ checked Sep 17, 2026	1-10	6 contacts →
	Indirect evidence “At Vivid Edge, we're passionate about helping our customers save precious time and funds while cutting carbon.” Source: RevenueBase Database · checked Sep 17, 2026
24	Codex Energy Consultants LTD	Indirect evidence	Ballycoolin, IrelandHQ checked Sep 17, 2026	1-10	6 contacts →
	Indirect evidence “Codex Energy Consultants Ltd is a company of specialist engineering and energy consultants.” Source: RevenueBase Database · checked Sep 17, 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: retrofit 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 retrofit contractors.
Partial evidence: Its own public description names part of retrofit contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name retrofit 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 24 of 94 retrofit contractors based in Ireland

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Retrofit contractors based in Ireland at a glance

As of Sep 17, 2026

13.4%Verified-email coverage

569.3Average contacts per company

11-50Median size (employees)

16.0%Largest-city concentration · Dublin

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 94 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 retrofit 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 “retrofit 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 retrofit 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 retrofit 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, 7,160 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 17, 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 retrofit 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 retrofit contractors are there based in Ireland?

RevenueBase identified 94 retrofit 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 retrofit contractors?

Dublin leads with 15 headquartered companies, followed by Cork (3) and Waterford (3).

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 7,160 verified decision-maker contacts tracked across these 94 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 17, 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.