Smith was a prolific Toronto architect who designed a variety of buildings, although he is best remembered for his domestic architecture. He arrived in Toronto in 1888 with his wife Annie, and began Eden Smith architectural practice in 1892. His early buildings include St. Simon, near Bloor St. E. and St. John the Evangelist, Portland St., otherwise known as the Garrison Church, which was demolished in November, 1963, Grace Church on the Hill and St. Thomas's Anglican Church, where he was a parishioner. He designed the preparatory school of Upper Canada College and the Forest Hill residence of Frederick Wilhelm Kischel. Smith built St. Hilda's College, on the grounds of Trinity College, originally located in what is now Trinity Bellwoods Park; and Devonshire Place Devonshire House Residences, both on the grounds of the University of Toronto. During the First World War, he built three Carnegie libraries for the Toronto Public Library: the , the , and the . In 1913, he designed the Riverdale Courts, later the , an early low-income housing project near Withrow Park in Riverdale. He is also credited with the Studio Building, which was the non-profit home/studio of many of the Group of Seven. He designed many of the homes in the Wychwood Park neighbourhood and is thought to have built approximately 250 residences in Toronto over his career. His homes are strongly influenced by the English Arts and Crafts movement and many fall within the English Cottage style with steeply pitched roofs, tall chimneys, bands of small-paneled casement windows, and side-center internal plans. He retired in 1925, marking the end of the Eden Smith & Son practice which he ran with the assistance of his younger son Ralph Eden Smith. He died on October 10, 1949 and is buried in Woodlawn Cemetery in Guelph, ON. His elder son Harry Smith had also been an architect and worked with his father from 1907 until World War I. EdenSmith Lane, located in Toronto's Cabbagetown neighbourhood, honours Eden Smith who had been a resident of nearby Salisbury Street. His public housing co-op project, located in Cabbagetown at Spruce and Sumach Streets, was built in 1917 and is another example of his work.