The members met in homes and the log school house until 1840, when they built a small frame church on the southeast corner of Maple and Wisconsin Avenues.

[3] In 1842 when Caroline Quarlls, who had escaped from slavery in St. Louis, found her way along the Underground Railroad to Waukesha, parishioner Lyman Goodnow drove her in a wagon under cover of night on her way to Ontario.

They hired the Milwaukee architectural firm of Crane and Barkhausen and added an ell to each side to convert the floorplan from rectangular to cruciform.

They also restyled the building to the more current Gothic Revival style, replacing many flat-topped windows with pointed tops.

They covered much of the old clapboard exterior with brick, and added an 85 by 20 foot 1-story addition across the eastern end of the church.