C15 remodelling.
Round west tower, probably late C11, divided into stages by three stone bands.
Above, a corbel table surmounted by a C15 embattled parapet of flushwork chequering.
C15 south porch with angle buttresses to gable.
Above the door a seated figure in a semi-circular headed niche with decorated engaged shafts and roll-moulded and decorated arch.
North-west bay of chancel has C15 2-light window flanked by blocked circular openings.
Four-bay north clerestorey of C14 quatrefoil lights with red brick arches.
North aisle has two 2-light C13 'Y' tracery windows and, at the north-west corner, a fine north doorway with billet hood mould and shaft, scallop and roll-moulded arches
Interior: north arcade of five bays: the arches of bays 1, 3 and 5 have a triple chamfer with no imposts, bays 2 and 4 have plain arches with imposts, possibly C12.
Chancel arch early C14, quadrant moulded with half-shafts.
C14 double piscina in south-east corner of chancel.
In the north-east corner, a wall monument to C.Ashby, rector of Haddiscoe Head corbels for lenten veil in mid north and south walls.
Fragments of wall paintings: a C14 St. Christopher on the north wall of nave, with half a painted consecration cross.