West end of C14 ashlar added to earlier rubble nave.
The north aisle has a single C13 lancet in a chamfered surround to the west.
The north wall of the aisle has 2 two light C15 windows with trefoil heads and chamfered rectangular surrounds, also a blocked segmental headed doorway.
The C15 north chapel contains 2 two light windows in the north wall with cusped ogee tracery, quatrefoils to the heads and hollow chamfered rectangular surrounds.
The C14 chancel east window is of 2 lights with reticulated tracery.
In the south wall of the nave is a 3 light C16 panel traceried window with slightly pointed heads to the lights and a hollow chamfered surround.
The reset C12 inner doorway has nook shafts, cushion capitals, a plain tympanum with scratch dial and a single plain order beneath the chamfered hood mould.
Interior: 3 bay north arcade of c.1200, circular piers, annular capitals, octagonal responds, double chamfered round arches.
At the east end of the north aisle a pointed double chamfered C13 archway with shafted reveals leads into the north chapel.
Fittings: in the north chapel are 6 quarries of C15 painted glass.
C19 openwork ashlar pulpit.
C14 octagonal font with cusped quatrefoil panels, armorial shields and moulded underside to plain octagonal stem.
14th Century octagonal font.
Also in the north chapel an alabaster wall monument to Sir Charles Dymoke and wife with 2 praying figures in a surround of Corinthian columns supported on acanthus brackets with a moulded entablature and armorial escutcheon.
TF1346 : Monument to Sir Charles Dymoke & wife, St Oswald's church, Howell
In the chancel is a similar plain slab with marginal inscription to Sir Nicholas de Hebden d. 1416 and his wife Katherine d. 1424.
A further slab in the nave of 1458 commemorates Richard Boteler and his wife.