Long Marston is a village 7 miles W of York, near the site of a Civil War battlefield. The church is at the S end of Long Marston and adjacent to the hamlet of Hutton Wandesley.
The present church was rebuilt on this site in 1400 (Sherlock 2004, 114), reusing features possibly from two local churches (see History). Restored 1869 (Leach and Pevsner 2009, 578). There is no porch now, though there seems to have been one when Stephen Glynne visited in 1865 (Butler 2007, 267).
The exterior walls are largely rubble above three courses of cut Magnesian limestone; the W tower is ashlar. Nave and chancel in one, with massive plain N arcade, and N aisle. Vestry to N of chancel. There are two deeply splayed 12thc. windows with narrow openings in the chancel, one on the N and one on the S wall; another to the E of the nave doorway. The S doorway to the chancel is round-headed, plain, chamfered, and blocked. The only sculpture is in the fine S doorway to the nave.