Notman House was built in 1845 for lawyer William Collis Meredith, according to plans by John Wells. In 1876, the luxurious bourgeois home in the Neoclassical style was purchased by renowned photographer William Notman. In 1894, with support from Senator George A. Drummond, the house was completed with the addition of a hospital designed by architect Andrew T. Taylor to create St. Margaret’s Home for the Incurables. The house continued to serve in this capacity until 1991.
North of the house and visitor center, on Milton Street, is the Notman Garden: a 1000-square-metre green oasis akin to the gardens adorning the mansions of what was once the Golden Square Mile on Sherbrooke Street.

