History of Unitarianism in Utah was written and published in 1896. It is believed Margaret Benson Hudson was the author, but no know copy is know to exist. From September 1899 through March 1901 there were no business meetings, no elections of officers, and no social activities. On 20 April 1901 the AUA reorganized the society, and by 1903 efforts to construct a building began. A lot was purchased at 138 South 200 East and on 5 November 1903 the first meeting was held. This location served the membership until September 1926 when the building was sold to Trinity Baptist Church. A new site for the church was selected and purchased at 569 South 1300 East in May 1926. During the construction period, the Unitarians met at the Ladies Literary Club on South Temple. The new church was dedicated on 4 September 1927.

During the general assembly in May 1961 the American Unitarian Association merged with the Universalist Church of America (which traditionally proclaimed a universal salvation for all after death as opposed to a "hellfire and damnation" for the wicked) to form the Unitarian Universalist Association. The Salt Lake Unitarians also decided on a change of name; at the annual meeting on 26 January 1962 a constitutional amendment was proposed, discussed, and carried, changing the name to the First Unitarian Church of Salt Lake City.