The north nave doorway (now blocked) is of an unusual form, probably C11: a deep lintel sits upon square jambs, and above it is a round arch.
An early C14 pointed window in south aisle wall with matching restored piscina.
Later C14 traceried south nave window.
C15 coupled-rafter nave and chancel roofs, canted, and with unusual cavetto-moulded eaves sprockets.
In the north nave wall are two windows of c.1500.
Fine C15 octagonal limestone font with sunk panels on the bowl bearing roses, lions and angels
TM1051 : Baylham, St. Peter's Church: The octagonal font 8
the stem has lion figures, seated at each angle.
Their kneeling effigies are overshadowed by the skeletal figure of Death and beneath are their 5 children.
In the chancel floor is a series of 6 good marble floor slabs with achievements all to late C17 and early C18 members of the Acton family.
In the nave floor is another slab of 1689.