The aisles were rebuilt and widened between 1536 and 1549, bringing what had been a side chapel (now the Lady Chapel) into the body of the church. The nave was later also widened, at the expense of the north aisle, and a clerestory added by 1550 at the latest. Probably at this time the present roof over the nave was installed, though there is debate as to whether it was commissioned for the church originally. Later the chancel was widened to match the nave. The chancel was embattled soon after 1624, when Thomas Farmer, the master of Witton Grammar School, left money for the purpose in his will.