Large parish church, C13 with C15 upper stage of tower and C19 restorations, particularly of windows.
5-bay nave with north and south aisles and south porch, 5-bay chancel with north porch; west tower.
Ashlar and roughly coursed rubble, all sandstone, and Westmoreland slate roof.
Diagonal buttresses to 3-stage tower, clasping to chancel, angle to south aisle and south porch; decorated windows are C19 except for parts of 4 on south side of chancel and one on north; priest's door on south side of chancel blocked in 1867.
Nave arcades have plain capitals bearing double-chamfered arches.
Almond-shaped window, with glass by L C Evetts of Newcastle, in the west wall of the south aisle.
Tomb of Michael Matthew of Cleadon, died 1689, by Wm.
Smith; reclining figure of the period, a skull between the feet; contemporary-costumed weepers.
Two pre-Reformation bells dedicated to Sts.
Mary and Andrew; it is presumably for this reason that the church is sometimes said to be dedicated to either saint; however, its original dedication, if any, is not known.