1. CRH

CRH plc is an international building materials group. The group was formed through a merger in 1970 of two leading Irish public companies, Cement Limited (established in 1936) and Roadstone Limited (1949). It is headquartered in Dublin.

2. Ingersoll-Rand

Ingersoll-Rand Irish Holdings operates as a subsidiary of Ingersoll-Rand Plc. The industrial techology firm makes climate control systems.

3. Kingspan

Kingspan manufactures insulation and building envelope solutions for the construction industry. It is based in Ireland but has operations in western and eastern Europe, the United States, India, Australasia and the Middle East.

4. Grafton

The Grafton Group plc is a builders merchanting, DIY retailing and mortar manufacturing markets in Britain and Ireland. In Ireland it trades under the brands Woodie’s DIY , Heiton Buckley, Chadwicks and MacNaughton Blair. These businesses turnover €2 billion from 600 lo...

5. Actavo Group Ltd

Actavo is an international engineering solutions company operating in 100+ locations. Sectors in which Actavo specialises include power generation, marine, petrochemical, nuclear, home energy, satellite and telecommunications, education, healthcare, events services, civ...

6. Jones Engineering Limited

Jones Engineering Group is a multi-disciplined engineering company offering the full range of process engineering and building services installations. Founded in 1890, it is celebrating over 125 years of engineering and construction excellence. The firm has a number ...

7. Josar Holdings (Kentech)

Kentech provides engineering, procurement, construction, commissioning and maintenance services to the energy industry. Its customers are in the oil, gas, power, and petrochemical industries in the Middle East, Russia and Mexico. The company was founded in Ireland...

8. Mercury Engineering

Mercury is a privately-owned company headquartered in Dublin, Ireland. The company began in 1972 and has operations in Ireland, UK, Central Europe and Scandinavia. Mercury Engineering is a provider of solutions within the construction industry be it management contra...

9. Graham

Graham is a privately owned company operating in the construction, asset management and project investment markets. The company is involved in construction through John Graham (Dromore) Ltd, in asset management through Graham Asset Management Ltd and investments through...

10. Doosan

DHEL is the Irish-based subsidiary of the Doosan Infrastructure group which is headquarted in Seoul, Korea. The group produces construction equipment which it ships to customers around the world. It has production facilities in Swords, Co Dublin.

11. Caterpillar Northern Ireland

Founded in 1966, Caterpillar (NI) Limited is Europe's largest diesel generating set manufacturer. The company houses eight Caterpillar divisions across four sites in Northern Ireland and has global manufacturing facilities in Brazil, China, India and the USA. The compa...

12. Sisk Group

SISK Group is a fith generation family business primarily known for the construction division John Sisk and Son which operates in Ireland, the UK, Poland and the Middle East. It has grown from a small local builder founded in Cork more than 150 years ago to an intern...

13. Northstone

Northstone (NI) Limited is a leading construction materials producer, utility chamber manufacturer and building and civil engineering contractor in Northern Ireland. The company has locations across Northern Ireland as well as in Co. Roscommon and in the UK. Northston...

14. PM Group

Project Management Holdings provides design, engineering, architecture, project planning and construction management services. Its clients are in private industry and public sector and it concentrates on the biopharma, food, energy and healthcare sectors. It was...

15. KN Network Services

KN Network Services is an infrastructure and utilities services provider operating in Ireland, UK and internationally. Its areas of expertise span civil engineering, telecoms, construction, wireless technologies, rail infrastructure and home energy services. Its Irish o...

16. Munster Joinery

Munster Joinery is one of the largest manufacturers of energy efficient windows and doors in Europe. Founded in 1973, the company has a wide range of products from uPVC to timber to AluClad and aluminium, all of which are manufactured in Ireland.

17. Lagan Group

The Lagan Construction Group has a heritage spanning over 50 years and counts as a major force in international construction and infrastructure schemes both in the domestic building and civil engineering markets. Specialist teams within the Lagan Group work across sect...

18. Brett Martin

Established in 1958, Brett Martin is a privately owned family business. With headquarters located on its founding site in Co Antrim, the manufacturing company employs almost 800 people at several locations throughout the UK and Europe. The company supplies specialist ...

19. DPS Engineering

DPS Engineering celebrated its 40th anniversary in 2015 as one of Ireland’s leading engineering groups, having acquired American firms Biometics and Project Planning and Delivery. Design and Planning Services serves blue-chip clients across a spectrum of industries, i...

20. Dornan Engineering

Dornan Engineering is a mechanical, electrical and instrumentation contractor operating in Ireland, the UK, Sweden, Germany, Belgium and Russia. Recent projects include the supply and installation of complete electrical and mechanical services on the new air traffic con...