Our Affiliates

Iron Workers 378

Iron Workers Union Local 378 was chartered on September 22, 1921 in Oakland, California. In 1992, our union hall relocated from Oakland to our current location in Benicia, CA. We are a mixed local union representing 2,500 tradespeople. Our jurisdiction covers from west to east, Oakland to Vacaville, from north to south, Lakeport to Crows Landing. Some of the Bay Area’s most recognized buildings, bridges, monuments, stadiums and sports arenas were built by members of Local 378. The work we perform includes but is not limited to structural steel, precast concrete, metal buildings, reinforcing steel, ornamental iron, fabrication, curtain walls, welding and rigging, and machinery moving. We represent the interests of the men and women of this organization by providing a quality standard of living for our membership through negotiating fair wages and benefits. We promote a unified workforce with our contractors and members, providing superior structures and facilities to our customers while ensuring that the utmost safety standards are adhered to. We are committed to executing the highest standard of performance in the field and in our leadership.