John Sisk & Son

John Sisk & Son is an international construction and engineering company delivering landmark projects across Ireland, the United Kingdom and Europe. Founded in Cork in 1859, the firm has been in operation for more than 165 years and is now a fifth-generation family business. It employs over 3,000 staff and reported revenue of more than €2.75 billion in 2024.

The company's work spans commercial, life sciences, data centres, infrastructure, residential and healthcare schemes. Projects delivered by Sisk include the Aviva Stadium, Croke Park, the Central Bank of Ireland and the Etihad Stadium expansion.

Sisk's technical focus covers construction engineering, modern methods of construction, sustainable construction and building safety. It describes its values as Care, Integrity and Excellence, with stated commitments to safety, sustainable management and responsible building practices that protect and enhance the environment.