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. Trane Technologies

Formerly Ingersoll-Rand, Trane Technologies was formed in early 2020 when part of the business separated and combined with Gardner Denver (which now trades as Ingersoll Rand Inc). Trane is listed on the NYSE. The industrial techology firm makes climate control system...

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. 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...

6. Saint-Gobain Construction Products

Saint-Gobain Construction Products manufactures and supplies building materials. Formerly known as Gypsum it has operated in Ireland since 1936. In 2005, it became part of the Saint-Gobain group.

7. 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...

8. KN Circet

KN Circet 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 office is l...

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. 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...

11. Jones Engineering Holdings

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 ...

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. 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.

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. E & I Engineering Ireland

E&I Engineering provides switchgear, power distribution solutions and energy management systems throughout Ireland, the UK and mainland Europe. Its team of chartered engineers manages every aspect of a project from concept design with consultants, manufacture, delivery,...

16. 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...

17. 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...

18. Kirby Group Engineering

Founded in 1964, Kirby Group Engineering provides electrical and mechanical engineering contracting services to clients across a number of sectors including data centres, life sciences, industrial, commercial, substations and renewables.

19. 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 ...

20. Suir Engineering Ltd

Suir Engineering has over 30 years of mechanical, electrical and instrumentation experience with many blue chip clients in sectors including commercial, health and social care, manufacturing and industrial, science and technology and utilities. It has undertaken various...