Current building
Chartres Cathedral, built of limestone, is around 34 m high and 130 m long internally. It has a four-bay choir with double aisles and a double ambulatory with six radiating chapels, of which three are shallow and three, reflecting the surviving crypt chapels, are deeper.
The transepts have three bays with east and west aisles; the six-bay nave has single aisles and a western block with two towers.
The elevation is three storeyed, with piliers cantonnés for the main piers, a narrow triforium and a clerestory that was unprecedently high.