Company lists · Data refreshed September 2026

Top 25 Quantity surveying companies based in Ireland

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 86 companies tracked

RevenueBase identified 86 quantity surveying companies headquartered in Ireland as of September 2026 and tracks 584 professional contacts across them, including 358 with verified work emails. Dublin is the largest hub.

This list covers quantity surveying 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 21, 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 21, 2026 86% judged on-target in blind review

86Companies

584Contacts tracked

358Verified emails

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The 25 largest quantity surveying companies based in Ireland

Ranked by team size

Top 25 of 86 quantity surveying companies based in Ireland, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to quantity surveying 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	Rogerson Reddan	Indirect evidence	Dublin 4, IrelandHQ checked Sep 21, 2026	11-50	53 contacts →
	Indirect evidence “Rogerson Reddan (RR) is a multi-disciplinary consultancy practice serving the Construction Industry.” Source: RevenueBase Database · checked Sep 21, 2026
2	Carron Walsh A Tetra Tech Company	Strong evidence	Dun Laoghaire, IrelandHQ checked Sep 21, 2026	11-50	42 contacts →
	Strong evidence “Carron + Walsh a Tetra Tech Company is a professional consultancy practice specialising in Quantity Surveying, Project Controls and Project Management.” Source: RevenueBase Database · checked Sep 21, 2026
3	MMP	Strong evidence	Dublin 4, IrelandHQ checked Sep 21, 2026	11-50	36 contacts →
	Strong evidence “MMP (Mulcahy McDonagh & Partners) is one of Ireland’s most established construction consultancies, providing Quantity Surveying, Project Management, and Funder Advisory services…” Source: RevenueBase Database · checked Sep 21, 2026
4	Buildcost	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “Buildcost are a Chartered Quantity Surveying practice based in Dublin & Donegal, Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
5	Kelly & O'callaghan	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	21 contacts →
	Strong evidence “Kelly and O’Callaghan (KOC) is an independent, professional Chartered Quantity Surveying and Project Management consultancy firm, providing a comprehensive range of specialist…” Source: RevenueBase Database · checked Sep 21, 2026
6	Nolan Construction Consultants	Indirect evidence	Waterford, IrelandHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “Nolan Construction Consultants was formed by previous partners of Nolan Ryan Partnership to meet new challenges in a changing construction economy.” Source: RevenueBase Database · checked Sep 21, 2026
7	Denis Williams Design Services	Indirect evidence	Dundalk, IrelandHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect evidence “Denis Williams Design Services is based in Dundalk, Co.” Source: RevenueBase Database · checked Sep 21, 2026
8	O'reilly Hyland Tierney & Associates	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	17 contacts →
	Strong evidence “O’Reilly Hyland Tierney + Associates (ORHT) is one of the longest established Quantity Surveying & Project Management Practices in Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
9	Mcgahon Surveyors	Strong evidence	Dundalk, IrelandHQ checked Sep 21, 2026	11-50	17 contacts →
	Strong evidence “McGahon Surveyors is an award-winning Chartered Quantity Surveying and Construction Cost Consultancy practice, delivering expert cost and project management services across…” Source: RevenueBase Database · checked Sep 21, 2026
10	MGM Partnership	Strong evidence	Dublin, IrelandHQ checked Sep 21, 2026	51-200	15 contacts →
	Strong evidence “MGM Partnership is a leading Chartered Quantity Surveying, Project Management and Project Advisory practice supporting complex capital developments across Ireland and the UK.” Source: RevenueBase Database · checked Sep 21, 2026
11	Cuddyqs	Indirect evidence	Limerick, IrelandHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “At CuddyQS, we deliver Detailed Cost Control & Financial Management to our clients, we simply do not do Cost Reporting.” Source: RevenueBase Database · checked Sep 21, 2026
12	MDCS	Indirect evidence	Parkwest, IrelandHQ checked Sep 21, 2026	1-10	14 contacts →
	Indirect evidence “MDCS is a Progressive and forward-thinking multi disciplined professional company offering a full range of traditional QS services whilst utilising the latest business practices…” Source: RevenueBase Database · checked Sep 21, 2026
13	CQS Group	Strong evidence	Mullingar, IrelandHQ checked Sep 21, 2026	11-50	11 contacts →
	Strong evidence “CQS Group is a Chartered Quantity Surveying & Project Management Consultancy which was established in The Group operates from three office locations, London which services the UK…” Source: RevenueBase Database · checked Sep 21, 2026
14	Andrew P. Nugent & Associates Apna	Indirect evidence	Dublin 6w, IrelandHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “Andrew P.” Source: RevenueBase Database · checked Sep 21, 2026
15	Michael Barrett Partnership	Strong evidence	Cork, IrelandHQ checked Sep 21, 2026	11-50	10 contacts →
	Strong evidence “Michael Barrett Partnership is one of the South of Ireland’s leading Quantity Surveying and Cost Consultancy practices, with a proven track record of delivering total cost…” Source: RevenueBase Database · checked Sep 21, 2026
16	Mcgrath Quantity Surveyors	Strong evidence	Enniscorthy, IrelandHQ checked Sep 21, 2026	1-10	8 contacts →
	Strong evidence “Quantity Surveying & Project Management.” Source: RevenueBase Database · checked Sep 21, 2026
17	Quantixccm	Partial evidence	Dublin, IrelandHQ checked Sep 21, 2026	1-10	7 contacts →
	Partial evidence “At Quantix, we specialize in delivering industry-leading construction cost management solutions and partner with some of the world’s most recognized companies to ensure financial…” Source: RevenueBase Database · checked Sep 21, 2026
18	Macminn O'reilly Mahon	Partial evidence	Waterford, IrelandHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “MacMinn O’Reilly Mahon Quantity Surveyors was originally established in Waterford during 1984 and is respected within the industry for its professionalism and fresh thinking…” Source: RevenueBase Database · checked Sep 21, 2026
19	Lawlor Burns & Associates	Strong evidence	Limerick, IrelandHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “Lawlor Burns & Associates is one of Ireland’s leading Chartered Quantity Surveying and Project Management construction consultants.” Source: RevenueBase Database · checked Sep 21, 2026
20	O'byrne Jenkins Chartered Quantity Surveyors And Project Managers	Strong evidence	Dublin 2, IrelandHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “O’Byrne Jenkins is a reputable and well-regarded consultancy in Chartered Quantity Surveying and Project Management, offering professional services and strategic guidance to the…” Source: RevenueBase Database · checked Sep 21, 2026
21	Brendan Merry & Partners	Indirect evidence	Dublin, IrelandHQ checked Sep 21, 2026	11-50	5 contacts →
	Indirect evidence “Brendan Merry & Partners believe in delivering value for money to all our clients.” Source: RevenueBase Database · checked Sep 21, 2026
22	Austin Reddy & Company	Indirect evidence	Dublin 3, IrelandHQ checked Sep 21, 2026	11-50	5 contacts →
	Indirect evidence “Austin Reddy & Co.” Source: RevenueBase Database · checked Sep 21, 2026
23	Lambert Surveyors	Strong evidence	Kildare Town, IrelandHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Lambert Surveyors are a Kildare based Chartered Quantity Surveying practice operating in the Kildare and Dublin areas and also throughout Ireland.” Source: RevenueBase Database · checked Sep 21, 2026
24	Virtus	Strong evidence	Dublin 7, IrelandHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “Virtus Project Management is one of Ireland’s leading Project Management and Quantity Surveying companies.” Source: RevenueBase Database · checked Sep 21, 2026
25	Quantex	Partial evidence	Galway, IrelandHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “Chartered Quantity Surveyors providing services in Construction Estimation, Project Management, Construction Claims, Commercial Management, Construction Budgets, Cost Management…” Source: RevenueBase Database · checked Sep 21, 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: quantity surveying 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 quantity surveying companies.
Partial evidence: Its own public description names part of quantity surveying companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name quantity surveying 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 86 quantity surveying companies based in Ireland

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Quantity surveying companies based in Ireland at a glance

As of Sep 21, 2026

61.3%Verified-email coverage

6.8Average contacts per company

1-10Median size (employees)

17.4%Largest-city concentration · Dublin

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 86 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 quantity surveying 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 “quantity surveying 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 quantity surveying 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 quantity surveying 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, 358 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 21, 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 quantity surveying 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 quantity surveying companies are there based in Ireland?

RevenueBase identified 86 quantity surveying 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?

Rogerson Reddan, headquartered in Dublin, tops this list with the largest team on record.

Which city has the most quantity surveying companies?

Dublin leads with 15 headquartered companies, followed by Cork (4) and Dundalk (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 358 verified decision-maker contacts tracked across these 86 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 21, 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.