The cathedral school is on the S side of Eastgate, occupying the site of the Deanery, built by William Burn in 1847. This is to the E of the medieval deanery of which only the N wall survives, separating the garden from Eastgate. Reset in the S face of this wall are a number of architectural and sculptural fragments which are said to have come from the cathedral. Institutionally the cathedral school was originally for the choristers of Lincoln Cathedral, but in 1996 it was merged with St Joseph's School for Girls and Stonefield House School to become Lincoln Minster School, to which was added St Mary's Preparatory School in 2011. The formal association with the cathedral was ended by Lincoln Minster School in 2016 and most choristers are now drawn from other local schools.

A separate boarding house for choristers was first provided by Bishop Gravesend in 1264. He ordained that there should be twelve choristers with a master supervised by a canon of the cathedral (see Victoria History, 424ff)

The fragments are too badly preserved to suggest a possible date more precise than the 12thc.