You can rent out rooms in the house you live in, but that is less of a thing now than in the past. In the 1800s/1900s widows, spinsters, old women, that had property would often get by by renting out rooms/beds, essentially being a "mother" to young men or women. Men/women came to the city to work, or school, or whatever and they would rent a room and the landlady would serve meals, do laundry, etc.

Recently, in large parts of the Greater Toronto Area, it has not been legal to rent out rooms in your house. It was and is legal in the original city of Toronto and other municipalities that were later incorporated into the megacity. There is a proposal before city council to legalize it across the city, but so far no decision has been made.

Do any of you have some data to back it up or just some anecdotes and stories? The poster claimed this was a tradition and the goal of owning property, so surely there’s some documentation of this being a global phenomenon?