The Perpendicular Gothic clerestory is 14th or early 15th century. In the 15th century the tower piers were strengthened and the two upper stages of the tower were built. In 1442 the north transept was rebuilt with five-light Perpendicular Gothic north and east windows with panel tracery. At about the same time the south transept acquired similar windows and was extended eastwards to form a chapel with a 15th-century piscina. The Perpendicular Gothic nave west window was inserted in 1672–73, making it an example of Gothic survival. In 1838 the north aisle north wall was rebuilt under the direction of George Wilkinson.