Company lists · Data refreshed September 2026

Top 25 Consultancy companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 1,009 companies tracked

RevenueBase identified 1,009 consultancy companies headquartered in Ireland as of September 2026 and tracks 11,557 professional contacts across them, including 5,558 with verified work emails and 622 with mobile numbers. Dublin is the largest hub.

This list covers consultancy 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 24, 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 24, 2026 86% judged on-target in blind review

1,009Companies

11,557Contacts tracked

5,558Verified emails

622Mobile numbers

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The 25 largest consultancy companies based in Ireland

Ranked by team size

Top 25 of 1,009 consultancy companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to consultancy 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	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 24, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 24, 2026
2	O'connor Sutton Cronin	Indirect evidence	Dublin, IrelandHQ checked Sep 24, 2026	201-500	241 contacts →
	Indirect evidence “OCSC is an established International Multidisciplinary Consulting Engineering & Project Management Practice.” Source: RevenueBase Database · checked Sep 24, 2026
3	MKO	Strong evidence	Galway, IrelandHQ checked Sep 24, 2026	201-500	210 contacts →
	Strong evidence “MKO is Ireland’s largest Planning and Environmental consultancy.” Source: RevenueBase Database · checked Sep 24, 2026
4	Landell Mills	Strong evidence	Blackrock, IrelandHQ checked Sep 24, 2026	51-200	197 contacts →
	Strong evidence “Leading international development consultancy Providing communities, economies and environments with the means and opportunities to grow Founded in 1975, Landell Mills is a…” Source: RevenueBase Database · checked Sep 24, 2026
5	Dbfl Consulting Engineers LTD	Indirect evidence	Dublin, IrelandHQ checked Sep 24, 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 24, 2026
6	KSN	Strong evidence	Dublin 4, IrelandHQ checked Sep 24, 2026	51-200	165 contacts →
	Strong evidence “KSN is an independent Irish owned construction consultancy founded over 35 years ago.” Source: RevenueBase Database · checked Sep 24, 2026
7	MWP	Indirect evidence	Blackrock, IrelandHQ checked Sep 24, 2026	51-200	160 contacts →
	Indirect evidence “MWP is a multi-disciplinary Engineering and Environmental Consulting Practice providing a first class service to its clients since it was founded in 1967.” Source: RevenueBase Database · checked Sep 24, 2026
8	Cubematch	Strong evidence	Dublin, IrelandHQ checked Sep 24, 2026	201-500	149 contacts →
	Strong evidence “CubeMatch is a global change and transformation consultancy, Powering Change for Financial Services since 2002.” Source: RevenueBase Database · checked Sep 24, 2026
9	KSNPM	Strong evidence	Dublin, IrelandHQ checked Sep 24, 2026	51-200	118 contacts →
	Strong evidence “KSNPM is a trusted, multi-disciplinary, project management led building consultancy.” Source: RevenueBase Database · checked Sep 24, 2026
10	Punch Consulting Engineers	Strong evidence	Limerick, IrelandHQ checked Sep 24, 2026	51-200	105 contacts →
	Strong evidence “PUNCH Consulting Engineers is the business name of Michael Punch and Partners Limited and is one of Ireland's leading + most experienced engineering consultancies.” Source: RevenueBase Database · checked Sep 24, 2026
11	Ryan Hanley, NOW Stantec	Strong evidence	Galway, IrelandHQ checked Sep 24, 2026	51-200	98 contacts →
	Strong evidence “Ryan Hanley is a leading Engineering and Environmental Consultancy.” Source: RevenueBase Database · checked Sep 24, 2026
12	Osborne	Strong evidence	Dublin 2, IrelandHQ checked Sep 24, 2026	51-200	88 contacts →
	Strong evidence “Osborne is a Leading, International, Irish Owned, multi Award-Winning Recruitment Consultancy with a reputation for Recruitment Excellence.” Source: RevenueBase Database · checked Sep 24, 2026
13	Nfp, An AON Company Ireland	Indirect evidence	Blackrock, IrelandHQ checked Sep 24, 2026	51-200	86 contacts →
	Indirect evidence “NFP, an Aon company, helps companies and individuals address today’s most significant Risk Capital and Human Capital challenges.” Source: RevenueBase Database · checked Sep 24, 2026
14	Barrett Mahony Consulting Engineers	Strong evidence	Dublin 2, IrelandHQ checked Sep 24, 2026	51-200	79 contacts →
	Strong evidence “Barrett Mahony Consulting Engineers is an established civil and structural engineering consultancy specialising in all aspects of civil and structural engineering and project…” Source: RevenueBase Database · checked Sep 24, 2026
15	Mitchell Mcdermott	Strong evidence	Dublin 4, IrelandHQ checked Sep 24, 2026	51-200	77 contacts →
	Strong evidence “Mitchell McDermott is an independent firm of Construction Consultants founded by Paul Mitchell and Anthony McDermott in 2015.” Source: RevenueBase Database · checked Sep 24, 2026
16	Prochem Engineering	Strong evidence	Kilkenny, IrelandHQ checked Sep 24, 2026	51-200	75 contacts →
	Strong evidence “Prochem Engineering is one of the leading engineering consultancy firms in Ireland, having been established in 1995.” Source: RevenueBase Database · checked Sep 24, 2026
17	AWN Consulting LTD	Strong evidence	Dublin, IrelandHQ checked Sep 24, 2026	51-200	74 contacts →
	Strong evidence “AWN Consulting is a multidisciplinary consultancy offering specialist design advice in respect of a wide range of engineering and environmental disciplines.” Source: RevenueBase Database · checked Sep 24, 2026
18	HLB Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 24, 2026	51-200	70 contacts →
	Indirect evidence “HLB Ireland provide quality accountancy services and business advice to entrepreneurial and owner managed businesses.” Source: RevenueBase Database · checked Sep 24, 2026
19	IAC Archaeology	Indirect evidence	Kilcoole, IrelandHQ checked Sep 24, 2026	51-200	70 contacts →
	Indirect evidence “Established since 1998, IAC Archaeology is a multidisciplinary archaeological practice.” Source: RevenueBase Database · checked Sep 24, 2026
20	Crewit Resourcing Group	Strong evidence	Dublin, IrelandHQ checked Sep 24, 2026	51-200	66 contacts →
	Strong evidence “We are an international recruitment consultancy.” Source: RevenueBase Database · checked Sep 24, 2026
21	Tandem Project Management LTD	Strong evidence	Blackrock, IrelandHQ checked Sep 24, 2026	51-200	65 contacts →
	Strong 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 24, 2026
22	CS Consulting Group Civil & Structural Engineers	Indirect evidence	Dublin, IrelandHQ checked Sep 24, 2026	51-200	54 contacts →
	Indirect evidence “Realising visions, delivering solutions: CS Consulting Group is a team of highly qualified civil and structural engineers and technicians offering responsive, innovative…” Source: RevenueBase Database · checked Sep 24, 2026
23	Rogerson Reddan	Strong evidence	Dublin 4, IrelandHQ checked Sep 24, 2026	11-50	53 contacts →
	Strong evidence “Rogerson Reddan (RR) is a multi-disciplinary consultancy practice serving the Construction Industry.” Source: RevenueBase Database · checked Sep 24, 2026
24	Agile Executives	Indirect evidence	Dublin 4, IrelandHQ checked Sep 24, 2026	11-50	52 contacts →
	Indirect evidence “Agile Executives helps business owners achieve their goals by helping to increase turnover, improve cashflow and increase the value of the company.” Source: RevenueBase Database · checked Sep 24, 2026
25	Cogent Associates Ireland	Strong evidence	Dublin 2, IrelandHQ checked Sep 24, 2026	51-200	48 contacts →
	Strong evidence “Cogent Associates is an independent Irish Project Management and Cost Management consultancy, providing Quantity Surveying, Construction Consultancy and specialist property…” Source: RevenueBase Database · checked Sep 24, 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: consultancy 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 consultancy companies.
Partial evidence: Its own public description names part of consultancy companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name consultancy 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 1,009 consultancy companies based in Ireland

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Consultancy companies based in Ireland at a glance

As of Sep 24, 2026

48.1%Verified-email coverage

5.4%Mobile-number coverage

11.5Average contacts per company

1-10Median size (employees)

26.7%Largest-city concentration · Dublin

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

699

11-50

167

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

4,3180–30

1,16131–60

6661–90

190–180

12180+

Company record updated

Median 69.0d

00–30

3,58731–60

4,71261–90

2,48990–180

769180+

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 consultancy 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 “consultancy 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 consultancy 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 consultancy 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, 5,558 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 24, 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.

Consultancy companies by metro

Consultancy companies in Dublin269
Consultancy companies in Cork48

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 consultancy 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 consultancy companies are there based in Ireland?

RevenueBase identified 1,009 consultancy 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?

Grant Thornton Ireland, headquartered in Ireland, tops this list with the largest team on record.

Which city has the most consultancy companies?

Dublin leads with 269 headquartered companies, followed by Cork (48) and Blackrock (21).

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 5,558 verified decision-maker contacts tracked across these 1,009 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 24, 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.