The majority of the building is built from local sandstone. The vaults are built of brick. In the 18th Century, limestone sheathing was added to the pillars. Most of the sandstone came from a quarry at Ostermundingen. Additional material came from three other quarries, each with differing color and quality. The various stone types were used more or less randomly throughout the entire building. The pillar bases, capitals, windows and sculptures are all from the highest quality, blue sandstone from the Gurten quarry, south of Bern. During reconstruction projects in the 19th and 20th Centuries, several other sandstone types were used.