In the early decades of the 1900s, Walsh Brothers participated in all forms of building construction, including commercial, government, ecclesiastical, academic, and residential. Believing no job was too small or too large, the company constructed homes, apartments, schools, police headquarters, and fire stations, operating out of a small house and barn on Hampshire Street in Cambridge. The company provided a livelihood for scores of new immigrant craftsmen, many of whom formed the first of many generations that would work for Walsh Brothers.
In the 1920s and 1930s, Walsh Brothers established its reputation as one of the region’s preeminent ecclesiastical general contractors. The company built churches and schools throughout New England and New York. During this period, some of the larger, more recognizable projects include the Cardinal’s residence for the Archdiocese of Boston, Bapst Library, and Devlin Hall on Boston College’s Chestnut Hill campus.