He won the competition to expand the first Sun Life Building and was the architect for that project, which he began in 1890.

Findlay cultivated an extensive practice, working in later years with his son, Frank.

His private clients included four members of the Molson family, Robert Wilson Reford, F.E.

[1] Many of the Golden Square Mile homes that he designed were later purchased by McGill University, including the Sir Mortimer Davis House (now Purvis Hall).

Findlay designed the Calvary Congregational Church (1911) in Westmount, located at the intersection of Greene Street and Dorchester Boulevard (demolished in 1961).