Walter Evans was born on April 10, 1870, at Belleville, Ontario, to parents Mary Ellen Henry and John Dunlop Evans (a surveyor and architect). He married his first wife, Jennie Leah Henry, on September 18, 1901, at Ottawa, Ontario. He later married Marjorie Miriam Struthers after the death of his first wife in 1925. Throughout his career he worked as an Ontario Land Surveyor and engineer. He worked with his father, John Dunlop Evans, at their company "Evans & Evans, Civil Engineers and Ontario Land Surveyors." After his father's retirement in 1928, the company became "J. Walter Evans & Co. Engineers & Surveyors." Evans was also a trailblazer in the steel and metal industries - placing patents on many of his electrical furnace inventions. He died only 8 years after his father, on November 6, 1938 at Beardmore, Thunder Bay, Ontario.