John Sisk and Son is an international construction and engineering company founded in Cork in 1859, now in its fifth generation of family ownership. The company operates across Ireland, the UK, and Europe with a workforce exceeding 3,000 staff, generating revenue surpassing €2.75 billion in 2024. It specialises in designing and building complex commercial, industrial, and infrastructure projects across multiple sectors.
The company has particular expertise in data centre construction, life sciences facilities, healthcare buildings, and infrastructure engineering, alongside commercial and residential development. Its portfolio includes landmark projects such as Aviva Stadium, Croke Park, the Central Bank of Ireland headquarters, and the Etihad Stadium expansion. Beyond design and build services, Sisk operates across construction management, modern methods of construction, and safety management disciplines.
Sustainability and environmental management form part of the company's stated operational framework, alongside what it describes as a commitment to responsible building practices. Its technical capabilities span civil and structural engineering, construction management, and infrastructure delivery across multiple geographies and project types.
