The former grammar school, founded by Edward Halsall in 1593, has an embattled parapet, gabled to the south.
Above are the worn arms of Halsall and an inscription said to be 'EH 1593' (VCH).
The gabled porch has a C19 niche below the apex, containing a figure of St Cuthbert.
The east window of the aisle is early C14, of 2 lights with tracery under a pointed head.
To its west is a 3-light early C16 window at clearstorey level.
To the north and south dwarf stone walls are linked to late C19 pulpits, the northern one with carved tracery and the southern one within an arched canopy.
The north wall of the chancel contains a C19 arch to the organ chamber and a deeply-moulded C14 vestry doorway which has a C14 panelled door with reticulated tracery in the head.
To its east is a recess, now containing an early C16 effigy.
In the south wall are C14 triple sedilia and a piscina, with cinquefoiled heads and moulded labels.
The choir stalls incorporate some C15 woodwork including misericords and bench ends.
The stone font has a round C19 bowl with carved quatrefoils, on a moulded stem which is probably C14.
This grade II listed font is situated outside, near the porch. Dating to the first half of the nineteenth century, it is of sandstone, octagonal in plan, with blind tracery decoration on its narrow stem. Each face of the bowl has two square foiled panels with central shield.
The west window of the north aisle and the east window of the south aisle contain fragments of medieval glass.