Concrete tile roofs.
West tower, C13, 2 stages, has to west 2 pairs of corner buttresses, 3 setoffs, with chamfered plinths.
To west, restored C14 doorway with moulded imposts, hood mould and mask stops.
Nave north side, 3 bays, C14, restored C19, has 3 buttresses, chamfered plinth and sill band.
To east, chamfered C13 piscina.
To right, 2 blocked arcade openings containing a 4 light and a 3 light C14 lancet with ogee reticulation and hood moulds.
Each end has a C13 style moulded lancet with hood mould and mask stops.
C13 tower arch, double chamfered, has separate mouldings each side of the archivolt.
Chancel arch, C13, restored C19, double chamfered, has triple shaft responds with cusps between them, moulded bases and crocketed foliate octagonal capitals.
North side has moulded C14 door and to right, segmental headed tomb recess, roll moulded and with C19 painted text, and hood mould.
Above, Easter Sepulchre, with moulded ogee recess with crocketed gable containing figures.
Flanked by 2 ogee headed panels with figures of soldiers.
Figure corbels.
Window has stained glass, late C19.
South side has to east, chamfered and moulded piscina, C13, and remains of a piscina in window recess.
Oak chest with bracket feet, leaf carving and inscription "A W 1763".
C19 wooden lectern, octagonal stem.
2 late C19 brass and iron chandeliers.
Panelled pulpit, stand and steps, oak, 1969.
Large alabaster monument to Edward Burnell, 1590.
SK7645 : Edward Burnell monument, St Peter's church, Sibthorpe
Top edge inscribed "Edward Burnell gt. departed this present world the -- december in the peace of our Lord 1589".
Inscribed "Made anno dmi 1590/ By me Barbara Burnell".