The church was built by T.H. Wyatt in 1854-5 but the south arcade of the choir may be a remnant from the 12thc. church. The chancel arch has imposts with Romanesque decoration.

As parts of its masonry show a church was standing at Nunton c. 1200. It was annexed to Downton church as a chapel, probably from its foundation, but, unlike the probably earlier chapels at Standlynch and Witherington, was not served under a special arrangement.

Pevsner dates the S chapel arcade as probably from the end of the 12thc.