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The school, designed by the Seattle Public Schools' house architect, James Stephen, honored the first Governor of the Washington Territory, Isaac Ingalls Stevens (1818-1862), who served under the title of "Superintendent of Indian Affairs" for the Washington Territory. He held this role from 1853-1857; subsequently, he served as a Congressional representative for the Washington Territory in Washington, DC, in 1857-1858, before being killed in action leading his division of the Union IX Corps at the Battle of Chantilly on 09/01/1862.

For the Stevens School, architect James Stephen (1858-1938) designed a Neo-classical Revival Style building with a projecting portico supported by paired Ionic columns. A large pediment hung over the main entry. The wood-frame building was set on a tall basement story; its roof was lit by a pair of gabled dormers. Ceiling proportions of rooms were high, amply lit by tall, thin double-hing windows.

An addition was made in 1922 in the same Neo-Classical Style. It was planned to include 22 rooms.