The church is long and, as will be seen from the photograph, the top of the tower is only about above the roof of the nave. In 1615, an earlier nave roof was replaced by "one of typical queen-post type with a complex timber truss", In 1676, a wooden gallery was added with dormer windows, one of which can be seen in the photograph. "The circular stairway to the gallery at the west end of the central aisle appears to have blocked the doorway to the tower." As there were only 80 'conformists' in Berrick in 1676, the gallery probably provided accommodation for the church choir and band. The names of the churchwardens responsible for both these improvements are recorded on now-faded signs. Sherwood and Pevsner commend the medieval tiles found in the chancel as one of the more notable collections in the county, along with those at Nuffield and Somerton.