 Measured in the interior, the chapel is 249 feet (76 m) long, 93.5 feet (28 m) wide at its transepts, and 78.5 feet (24 m) high at the crossing. Most of the interior is limestone, but the aisles and the central area of the choir are Aquia Creek sandstone. Sound-absorbing tile is mounted on parts of the wall and vault. Running west to east, the main sanctuary consists of a narthex, a gallery, a nave, two transepts joined by a crossing, and an elevated choir; it seats almost 2,000. The building's southeast corner houses a vestry.
