All Saints is seldom used for worship and is cared for by the Churches Conservations Trust.

The Grade-I listed church at Idmiston dates to the 12th century, though much of the current building is 14th century. From that latter period are the clerestory, and two-storey north porch.

The 13th century nave arcades paint an attractive picture, composed of alternating bands of different coloured stone. All Saints boasts a particularly fine collection of carved heads, including external grotesques (often incorrrectly called gargoyles) and internal corbel heads and roof bosses.

The interior features several notable monuments to members of the Bowle family. Among these are a memorial to a former vicar named John Bowle (d. 1788). Bowle was saddled with the nickname Don Bowle, after being responsible for editing an edition of Cervantes' Don Quixote. An earlier memorial worth noting is that of Giles Rowbach, dated 1633.