Church probably of cruciform plan in C13.
Tower circa early to mid C13.
Church extended with addition of four bay north aisle in C15.
Two bay chantry chapel for Colshull family added at east end of north aisle in late C15.
North transept added in C16.
Restored in 1860-1 by St Aubyn at cost of £2,700, Patrons, Bewes family.
North east chapel with late C15 unusual east window of high quality of four-lights beneath four-centred arch with moulded jambs and mullions and ornate cusped lights.
Carved label steps with grotesque figure at apex.
The north windows of chapel with original late C15 Perpendicular tracery with moulded mullions, cills and jambs with ornate cusped lights.
A castellated cornice and moulded string course decorated with grotesques and gargoyles continues around the chapel and rood loft projection.
North side of north aisle with two original circa C15 three-light Perpendicular windows beneath four-centred arches.
Incised spandrels with eroded carved label stops.
Reused carved bosses in C19 waggon roof to chancel.
tall shafts with unusual variation of type A (Pevsner) piers with moulding comprising two pronouced fillets to right and left of the deep hollow, tall bases slightly masked by raised floor, capitals decoratively carved and moulded four-centred arcade arches with pronouced crank at springing.
Two-bay north east Colshull Chapel with decoratively carved arcade, moulded piers as in north aisle with hollows decoratively carved with hearaldic motifs, intertwined foliage, grapes and vine leaves so producing convex moulded shaft carved tall bases with quatrefoils in central panels and moulded four-centred arcade arches with central hollow chamfer.
At east end, arcade arch rests on carved corbelled bracket of angels head.
C19 pulpit.
Further font in north aisle, near north transept, known as St Cuby's Font.
Circular granite font from holy well Possibly of pre-Christian origin and possibly carved with figures of griffin and dolphin.
Square in plan with decorated carved panels with bulbous foliage.
In chancel, piscina with cusped arch with projecting basin carved with quatrefoils.
North transept probably added in C16.
Reset circa late C15 carved parclose screen, probably part of rood screen.
Four bays with first, second and fourth bays with carved three-light Perpendicular traceried openings.
Elaborately carved with intertwined foliage and decorated with shields.
Memorials: large number of fine memorials in Colshull Chapel.
Recumbent effigy of knight in plate armour, Sir John Colshull who died in 1485.
Decorated with carved panels with quatrefoils and shields.
Inscription Johe's Colshull 1483 around margin of tablet.
Beneath north window table tomb of John Killiow of Westnorth (qv Westnorth Manor), died 1610
wife Dorothy Trevelyan who died in 1600 and whose arms are impaled with those of her husband on panel above tomb.
Two shields in spandrels with skull below: To Maria Arundel, died in 1629, daughter of Thomas Arundel and niece of Sir John Arundel who defended Pendennis Castle, Falmouth.
Well carved.
Other memorials include one to Henry Bewes by William Adran, 1793, signed 'Adran Fect London'.