Roof of handmade red clay tiles.
CHANCEL: has an E wall of red brick in irregular Flemish bond, probably late C17, with a C19 window.
In the N wall opening into the N chapel is an early C17 4-centred brick archway of 3 chamfered orders, with C19 jambs
On the S side is a C16 brick arcade of 3 bays with 4-centred arches of 3 chamfered orders on octagonal pillars and semi-octagonal responds with moulded capitals and bases
N CHAPEL: is early C17, repaired in the early C19.
The N and W walls are of early C17 brick in English bond with diaper patterns of black headers.
NAVE: has a NW angle of Roman bricks.
Further W is the partly restored and scraped late C14 N doorway with moulded jambs and 2-centred head and label.
The roof is C14/15, of crownpost construction, comprising 27 rafter couples all with soulaces, 3 hollow-chamfered straight tie-beams, and 3 octagonal crownposts with moulded capitals and bases and 4-way bracing
The S wall of the S aisle has 2 windows, C19 except the splays and chamfered segmental-pointed rear-arch of the eastern window, which are probably C15.
Further W is the C15 S doorway with jambs and 2-centred head in 2 chamfered orders, restored externally
FITTINGS: in the S wall of the S aisle is a C15 piscina of clunch with a round basin and chamfered 2-centred head.
Under the arch of the N chapel is a wrought-iron screen of plain pointed strikes with 3 stanchions surmounted by urns, gate towards the W end, late C17/early C18.
On the N wall of the nave, W of the C19 pulpit, is a wrought-iron holder for an hour-glass, early C18.
There are 5 bells, the third by Peter Hawkins, 1610, the fifth by Miles Graye, 1660.
In N chapel (2) to Mary, widow of Robert, Lord Petre, 1684-5, plain grey marble altar-tomb (illustrated in RCHM, 138) with panelled sides and a top of polished touch with lozenge of arms
(3) of John, Lord Petre of Writtle, 1613, Mary (Waldegrave) his wife, and Katherine, daughter of Edward Somerset, Early of Worcester and wife of William, second Lord Petre, 1624
monument erected by William, second Lord Peter
elaborate wall-monument of alabaster and marble, and of three bays with plinth and canopy
against plinth kneeling figures in high relief of four daughters and eight sons
in the centre bay on raised base figures of man in armour, and woman, both with fur-lined cloaks and kneeling at a prayer-desk
in side bays at a lower level kneeling figures of a woman on the N and a man on the S, similar to those of the centre bay
(2) to Frances, wife of James Austin, 1698, and James Austin, 1699, in black marble with moulded edge and achievement of arms
in the N chapel (5) to John Petre, 1669, in black marble with shield of arms
(6) to Brigite (Pynchon), widow of William, Lord Petre, 1694, in black marble with shield of arms
In the N chapel is a painted royal arms of Charles II dated 1673, and 2 C18 benefactions boards.