[2] The winning design by Bell & Kent had been altered already during the construction phase, when in 1901 the commission asked for the structure to be made more imposing by increasing the height of the dome.

[5] The building, constructed of Montana sandstone and granite, is in Greek neoclassical architectural style, and is listed on the National Register of Historic Places.

These paintings, painted for the Capitol opening in 1902 by the firm of F. Pedretti's Sons, depict four important archetypes of people of Montana's early history: a Native American (intended to be of Chief Charlo), an explorer and fur trapper (Jim Bridger), a gold miner (Henry Finnis Edgar, one of the discoverers of gold at Alder Gulch), and a cowboy (unidentified, but said to be inspired by the works of C.M.

The former State Law Library, now a set of committee rooms, features ten Montana landscapes created by Ralph E. DeCamp.

The House of Representatives Lobby features six scenes depicting significant events in early Montana History by Edgar S. Paxson.