The first sixty years of the 14th century, encompassing the reigns of Edward I, II and III saw the church embellished and enlarged. This was the "Decorated" phase of the Medieval Gothic.

The east end of the chancel was extended and the medieval crypt built beneath with its 6-part type vaulted roof, reached by a door from the sanctuary. A north aisle was added to balance the south, and the north aisle chapel added soon after. This is now the vestry and also houses the organ. The nave and south porch were refurbished in the 14th century.

The fine octagonal font with its stem decorated with "nodding ogee arches" is also of this period.