Chancel and south transept early C13.
Pre-Conquest fabric heavy roughly-squared rubble with massive quoins, medieval parts coursed rubble, C19 parts squared tooled stone with tooled ashlar quoins and dressings
Alterations in C13 style.
18 medieval cross slabs (9 complete) re-set in walls on north.
Interior: South door inside porch has chamfered C13 arch with hoodmould, holding C19 door with floral ironwork.
Slightly-pointed double-chamfered tower arch may be post-medieval, on older square jambs.
Mosaic reredos with SS Peter and Paul, mosaic paving in sanctuary, brass communion rail.
Carved pulpit with Frosterley marble shafts to pointed arcading
carved stone eagle lectern.
Octagonal font on old moulded base.
See [[1573180]]. The font dates from about 1300 and has a 17th C cover. {Source: Leaflet “St. Andrew’s Church, Bywell, Northumberland”; The Churches Conservation Trust.} Its location (under the tower) is shown in [[1573478]].
Early C19 memorial tablet in south transept.
Good Annunciation glass in north transept, Kings and shepherds in north chapel and Resurrection in east window.
H.M. and J. Taylor, 'Anglo-Saxon Architecture' Vol. I 121-122.