About Us

First chartered in February 5, 1934, Local 451 encompasses 3 counties throughout the state of Delaware – New Castle, Kent, and Sussex, 2 counties in Pennsylvania (see description) – part of Delaware and Chester County, and 1 county in Maryland (see description) – Cecil County. Please Note: Local #451 does not encompass some parts in Delaware and Chester County, Pennsylvania. For more detailed information, please see the map.
We are more than 200-members strong who are well-trained and ready to work with and for our signatory contractors.

We are a Local Union chapter of the International Association of Bridge, Structural, Ornamental and Reinforcing Ironworkers.

You’ll find our work at the heart of a building’s structure. Our members erect the structural framework of buildings and also reinforce its foundation. We also are essential in a variety of projects in both the  commercial and industrial projects such as erection of bridges, power plants, steel mills, oil refineries and blast furnaces.