Nantyffin Baptist Chapel was built in 1796, and rebuilt/modified in 1811, 1834, 1874 and 1897. The exterior, dated 1834, is built in the Vernacular style with a long-wall entry plan. The architect Thomas Thomas of Landore is believed to have designed the 1874 interior. The two pointed-head porches are the 1897 modifications.

RCAHMW, June 2009.