Gordon & Helliwell was a start-of-the-20th-century architectural firm based in Toronto, Ontario. Principals were Henry Bauld Gordon, RCA, (1854–1951) and Grant Helliwell (1855–1953).
Queen's Theological Hall, Kingston, Ontario, 1879
Queen's University Kingston, Ontario, Arts Building, Queen's University, 1879-80
Knox Church (interior), Toronto, Ontario, 1881
St. Andrew's Presbyterian Church, Brampton, Ontario, 1881
Upper Canada Bible and Tract Societies, Toronto, Ontario, 1886
Kilgour Brothers' Building, Toronto, Ontario, 1886
Toronto YMCA, Toronto, Ontario, 1887
Bathurst Street Methodist Church, Toronto, Ontario, 1888
Parkdale Presbyterian Church, Toronto, Ontario, 1888
West End YMCA, Toronto, Ontario, 1890
St. Peter's Church (addition), Toronto, Ontario, 1890
Church of the Messiah, Toronto, Ontario, 1891
35 Rosedale Road, Toronto, Ontario, 1891
Church of the Messiah Rectory, Toronto, Ontario, 1892
Orillia Opera House (built as Orillia City Hall), Orillia, Ontario, 1895
Harris Henry Fudger House, Toronto, Ontario, 1897
40 Maple Avenue, Toronto, Ontario, 1898
Avenue Road Church, Toronto, Ontario, 1899
49 Elm Avenue, Toronto, Ontario, 1901
181 Crescent Road, Toronto, Ontario, 1902
St. Peter's Anglican Church Rectory, Toronto, Ontario, 1905
Oaklands (addition), Toronto, Ontario, 1906
Wycliffe College, Toronto, Dining Hall and Dormitory Wing, 1907; Principal's Residence and new Chapel, 1911.
Church of the Epiphany, Toronto, Ontario, 1911
18 Elm Street, Toronto, Ontario, n.d.
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