The church is in Cram's signature Gothic Revival style, with buttressed walls and a blocky square tower with crenellations and spires.

An enclosed courtyard is formed by an office wing, banquet hall, and parish house, which are built to resemble Elizabethan architecture with brick first floor and half-timbered upper level.

A Gothic Revival structure later expanded with Stick style decoration, it stood at the present location of the West Newton Cinema.

The present building was built on the site of an early experimental normal school (later moved to Framingham and now Framingham State University, and has a stained glass window featuring two Massachusetts education pioneers (and parishioners of the church), Horace Mann and Cyrus Peirce.

[2] The building was listed on the National Register of Historic Places as the First Unitarian Church in 1986.