Callahan is a full service construction company serving the New England and Mid-Atlantic regions. We provide a wide range of ... preconstruction and construction management services, and execute large- and small-scale building projects for clients in multiple markets. With extensive experience, dedication to strong partnerships, and the ability to provide enhanced services that the competition can’t, we consistently deliver solutions that exceed clients’ expectations. It’s why we’re known as one of the leading open shop firms in New England. read more