It is a typical late Medieval church and has been designated by English Heritage as a Grade I listed building.

[3] The Grade I listing is for buildings "exceptional interest, sometimes considered to be internationally important".

[3][5] The plan consists of a tower at the west end, a chancel and nave under a continuous roof and a chapel to the north.

There is an aisle to the south under a separate gabled slate roof, with an embattled parapet and buttresses.

[6] A shorter aisle lies to the north of the church, west of the Butler Chapel.

[3] The Butler Chapel to the north of the church dates from 1480 and was founded as a chantry of St Katharine.