This toilet block was built to meet the needs of the increased number of monks in the second half of the 12th century. There were at least 59 cubicles. For a time there may have been up to a hundred monks at the Priory.
The toilets were on the first floor above a sewer running along the base of the south wall. You can still see where the sewer would have been. The archway at ground level on the south-eastern end of the outside wall shows where the waste was channelled away. Rectangular vents in the outside wall would have provided some welcome ventilation.
A spine wall separated the sewer from a large ground floor room. This may have been used as a laundry or for storage.
The toilet block is the largest surviving part of the Priory, escaping demolition when it was converted into a malt house.