North York: a 1950s build-out around older Willowdale streets
Most North York houses are mid-century, because the population surged from the 1950s (City of Toronto Archives, North York centennial exhibit). Don Mills shows the pace. As late as 1950 the area held around 20 farms; E.P. Taylor had assembled 2,000 acres by 1952; and it was designed as a model community between 1952 and 1965, in four quadrants around a shopping centre, with modernist houses on winding roads and culs-de-sac. The era-typical floor in those houses is plywood subfloor nailed, not glued, to the joists, now more than sixty heating seasons old.
Willowdale runs earlier. Its single-family homes range from 1910 to 1950s construction: one and two storey pre-war houses and modest one-and-a-half storey postwar ones. From the 1990s many were replaced by large two-storey houses on the same lots, and high-density building is confined to Yonge Street. A replacement house has a modern floor even when the houses either side are seventy years older, so on a Willowdale street we confirm the floor, not the address, before quoting.