Wills Bros is a family-owned civil engineering contractor that has been active since 1972 and is headquartered at Ballylahan Bridge, Foxford, County Mayo, Ireland, with established operations across Ireland and the UK. The group delivers design-and-build infrastructure and acts as main contractor and project supervisor (PSCS/PSDP in Ireland; Principal Contractor/Designer in the UK) on complex civil engineering schemes. Its core business spans major and minor road and bridge construction, bypasses and dualling schemes, street works, water, wastewater and utilities networks, flood prevention, marine and coastal works, land reclamation, landfill and environmental remediation, bulk earthworks, mineral extraction and processing, and enabling works for industrial and commercial sites. The company is also active in energy and low‑carbon infrastructure, including wind farms, solar farms, battery energy storage facilities, grid‑related works, and infrastructure for data centres and pharmaceutical facilities, as well as airport, port and rail projects such as Dublin Port and Glasgow Airport Investment Area.
Wills Bros promotes a self‑delivery model built around an extensive fleet of owned plant and a long‑serving workforce, and operates a UKAS‑accredited materials testing laboratory providing construction material testing and certification services. The group had more than 500 employees by 2022 and maintains regional offices in Ireland and the UK. It has adopted digital construction tools such as BIM and drone‑based surveying to improve project management, and holds ISO 9001, ISO 14001 and ISO 45001 certifications together with a BSI Kitemark for BIM information management. The company emphasises health and safety, community engagement, and environmental performance, including a stated journey toward net‑zero carbon and recognition as carbon neutral under the UN One Carbon World scheme.