Slate roofs with C19 crested red clay ridge tiles.
In the C15 the whole church except for the chancel was rebuilt.
The 5-bay south aisle the length of the nave, and the south porch were added first in circa 1420, followed by the west tower and the 7-bay north aisle the full length to the end of the chancel.
The south aisle was then extended by 1 bay eastwards and finally in circa 1480 the 3-bay Bosahan aisle was added to the east end of the north side of the north aisle when the road screen was inserted.
The south side of the south aisle has 5 granite C15 3-light Perpendicular windows with the polygonal rood stair turret between the 2 easternmost windows
Above this west window of the south aisle a reused section of circa C12 chevron moulding and another piece in the internal jamb of the east window.
The C15 south porch is also buttressed and has truncated shafts over the buttresses and a moulded plinth course
One of the 2 buttresses on the north aisle has a carved head at its top, the other has a jug-shape.
The additional Bosahan aisle at the east end of the north side of the north aisle has two 3-light Perpendicular windows with C19 limestone tracery and a 2-centred arch 3- light window with possibly reused late C14 intersecting cusped tracery in granite.
The set-back buttresses have carved heads at the top and pinnacles above, but below the parapets.
The 4-light west window has Perpendicular panel tracery and the west doorway of elvan has a finely moulded 2-centred arch with a trailing vine carved between the mouldings and carved head stops at the base of the jambs
the hoodmould has carved stops and there is a carved head in the voussoir above.
The doorway appears to be earlier than C15.
The rood screen has been removed but the arcade spandrels are pierced and the rood stair turret on the south side has a 2-centred chamfered arch doorway with pyramid stops.
The tall tower arch has roll- moulded responds and angel corbels with shields at the springing of the chamfered and bead-moulded 2-centred arch.
The floor of the sanctuary has late C19 encaustic tiles.
The carved wooden eagle lectern and octagonal pulpit with traceried panels are both circa early C20 and the square granite font is also early C20.
A small section of the wainscot of the rood screen is preserved in the Bosahan aisle and has unusual floral carving.
Monuments: A slate wall monument on the south-side of the chancel to Thomas Perry died 1734.
A marble wall monument with an urn to William Nicholls died 1803 by Isbell of Truro and another to John Nicholls died 1788 with a swaged urn.
it is a palimpsest, the back having C14 Flemish work with a knight in armour.
Stained Glass: In the tracery of the west window of the tower there are some fragments of medieval stained glass.
The large stained glass east window is in memory of Edward Rogers, died 1859.
A circa mid C19 stained glass south window of the chancel.
The east window of the south aisle has some C20 stained glass.