In the plan, the faint dotted line shows the position of the Long Choir demolished by Street and replaced with a smaller apse. The current sacristy building to the side of the cathedral was the Lady Chapel when the Long Choir existed. The former chapter house can be seen alongside the transept.

The crypt of Christ Church is the oldest surviving part of the cathedral dating from 1188 and is one of the largest medieval crypts in Britain and Ireland. It stretches under the entire cathedral and is 175ft long and a maze of huge stone columns supporting the cathedral above. Many historic pieces of stonework and fittings are stored here including the statues from the top of the old Tholsel (city hall) and the stocks. After the demolition of the Tholsel, the statues of Charles I and II and the Stuart Coats-of-arms were moved here. The stocks made in 1670 used to be kept in Christ Church yard but were moved here in 1870. Many pieces of stonework removed and replaced during the 'restoration' by George Street including monuments to important families and carved stones from the demolished Long Choir.