Although every town in western Pennsylvania with a sufficiently large population has at least one and sometimes up to three stone Presbyterian churches, this one has a particularly distinctive tower and a fine addition of 1907 to the south. Both are of Medina sandstone in a rough-cut and differently sized Richardsonian Romanesque manner. The conical tower and flush eaves reinforce the building's elementary shapes. The south addition is dominated by Emerson Chapel, with its arched doorway and narrow niches on either side. It is capped by an intersecting gable roof with a round cupola at its apex that echoes the corner tower on the older church. The chapel's windows were designed in 1906 and 1907 by J & R Lamb Studios of New York.