No 1: John Sisk & Son
John Sisk & Son group turnover last year was just over €1.485bn, down slightly from 2020’s €1.503bn. Turnover in 2022 is expected to hit €1.6bn. Revenue on the island of Ireland grew by €10m to €715m in 2021 and represented 48% of overall turnover.
Total Turnover: €1,485,700,000
ROI Turnover: €715.5M
International Turnover: €770.2M (UK €499.2M, Mainland Europe €271M)
No 2: Winthrop
Winthrop is unique in being the only dedicated data-centre delivery partner providing turnkey solutions to its clients, from design right through construction and on to commissioning and hand-over.
Total Turnover:€658,447,244
ROI Turnover: €234,122,533
International Turnover: €424,324,711
No 3: Bam Ireland
BAM has been operating in Ireland for over 60 years and has delivered many of the country’s flagship infrastructure projects and landmark buildings. It employs over 3,000 people directly and indirectly
Total Turnover: €633M
ROI Turnover: €560M
International Turnover: €73M
No 4: John Paul Construction
2021 was another good year for John Paul Construction, with turnover reaching €544m, €420m of which was generated in Ireland. The company continued its journey of sectoral and geographic diversification, delivering complex projects across all sectors of the industry in Ireland, the UK and the Middle East.
Total Turnover: €544M
ROI Turnover: €420M
International Turnover: €124M
No 5: Collen Construction
Established in 1810 and still a family-owned business, Collen has offices in Dublin, Sweden and Germany and employs 400 people. The company’s clients range from large-scale multinational corporations to private companies and state bodies. Collen has established a reputation for providing complex projects on time and within budget.
Turnover: €500M
ROI Turnover: €222M
International Turnover: €278M
No 6: PJ Hegarty & Sons UC
Total Turnover:€375M
ROI Turnover: €340M
International Turnover: €35M
Established in 1925, building contractor PJ Hegarty & Sons UC operates throughout Ireland and the UK, with offices in Dublin, Cork, Limerick and London.
No 7: Bennett (Construction) Ltd
Total Turnover: €320M
ROI Turnover: €250M
International Turnover: €70M
Bennett (Construction) Ltd is a family-own tier-1 construction contractor that has been at the forefront of construction for over 100 years and is now in its fourth generation.
No 8: Walls Construction Ltd
Total Turnover: €303M
ROI Turnover: €303M
The turnover of Walls Construction in 2021 was €303m, up from the €275m achieved in 2020.
No 9: JJ Rhatigan & Company
Total Turnover: €263.3M
ROI Turnover: €202.2M
International Turnover: €61.1M
Tier-1 main contractor JJ Rhatigan & Company was established in 1952 and remains a family-oriented operation, carrying on a strong tradition of building quality and innovation.
No 10: Wills Bros
Total Turnover: €163M
ROI Turnover: €82M
International Turnover: €81M
Founded in 1972 and celebrating 50 years of business in 2022, Wills Bros is a civil engineering contractor at the forefront of national infrastructure development in Ireland, the UK and Europe.
No 11: Murphy Ireland
Total Turnover: €158M
ROI Turnover: €136M
International Turnover: €22M
Murphy Ireland is a leading multi-disciplinary engineering and construction company that directly employs over 560 engineers, designers, technicians, managers, and operatives.
No 12: mac-group
Total Turnover: €144.5M
ROI Turnover: €102M
International Turnover: €42.5M
mac group has developed from a niche interior fit-out contractor into a collaborative construction partner, delivering complex construction, fit-out, and design and build projects.
No 13: Ardmac Group Ltd
Total Turnover: €130,196,965
ROI Turnover: €70,071,985
International Turnover: €60,124,980
Ardmac delivers high-value workspaces and technical environments in Ireland and across Europe. Headquartered in Dublin, with offices in Manchester, Craigavon, Brussels, Cork and Switzerland, Ardmac supports projects all over Ireland, the UK and Europe, and in 2021 completed expansion into Finland and Germany.
N0 14: Conack Construction
Total Turnover: €122M
ROI Turnover: €122M
Conack Construction is a general building and civil engineering contractor founded in 2008 by joint managing directors Kieran Cusack and Tom O’Connor.
No 15: Monami Construction
Total Turnover: €106M
ROI Turnover: €106M
Monami Construction provides a dynamic, innovative and highly experienced building service to clients of the construction industry.
No 16: SIAC Construction
Total Turnover: €96M
ROI Turnover: €90M
International Turnover: €6M
SIAC is a multi-disciplined construction group based in Dublin, with regional and divisional offices in Cork and Galway.
No 17: Flynn
Total Turnover: €95,725,517
ROI Turnover: €77,505,447
International Turnover: €18,220,070
Flynn has been in business for 18 years and provides a comprehensive range of construction management, fit-out and main contracting services.
No 18: Clancy Construction
Total Turnover: €95,721,578
ROI Turnover: €95,721,578
Clancy Construction ’s origins date back to 1947. Today, the contractor plays a pivotal role in the development of Irish construction. Its personnel are recognised leaders in the Irish construction sector, helping drive change, innovation and greater efficiency.
No 19: Jons Civil Engineering Company Ltd
Total Turnover: €92M
ROI Turnover: €92M
Jons Civil Engineering Company Ltd (JCEL) has been in operation since 1983. Since that time, it has successfully delivered over 330 major infrastructural projects.
No 20: Duggan Brothers Ltd
Total Turnover: €87M
ROI Turnover: €87M
Established in 1923, Duggan Brothers is now in its third generation and has completed circa 1,000 projects in both the private and public sectors.
No 23: Glan Agua MEIC
Total Turnover: €70,276,378
ROI Turnover: €51,751,663
International Turnover: €18,524,715
No 30: Ganson Building & Civil Engineering Ltd
Total Turnover: €50,077,982
ROI Turnover: €41,456,806
International Turnover: €8,621,176

No 32: Adston Group Holdings Ltd
Total Turnover:€46,262,062 (Estimated)
ROI Turnover: €14,207,696
International Turnover: €32,054,366

No 33: T&I Fit-Outs
Total Turnover: €46M
ROI Turnover: €46M

No 34: DFL
Total Turnover: €45,432,782
ROI Turnover: €35,274,808
International Turnover: €10,157,974

No 35: Clonmel Enterprises Ltd
Total Turnover: €44,439,802
ROI Turnover: €44,439,802

No 36: Arkil Holding Ltd
Total Turnover: €43.92M
ROI Turnover: €43,890,000
International Turnover: €30,000
