The Stone Chapel, a historic Tudor built in 1910, serves many purposes for the Proctor and Andover community. It was completely rebuilt in 2005, and it is now home to the school's highly popular voice and chorus programs, including the Alice Fowler Singers and the Proctor a capella group. The sanctuary of the original chapel serves as both a practice and performance space. Downstairs are practice rooms, where sopranos, tenors, baritones and bass singers practice in soundproofed spaces. On Sundays, the Chapel is used by the community as a Unitarian Church.