Secondary Suites in Caledon - Design, Permits, Construction

Most of Caledon sits inside the Greenbelt or on the Niagara Escarpment, and almost every rural property runs on private well and septic. An accessory dwelling unit here starts with a septic loading calculation - the existing bed often cannot legally take another bedroom, and a new tile field, not the building, becomes the largest single line in the budget. Caledon permits additional residential units, but most rural properties require a septic capacity assessment and, on the escarpment, Niagara Escarpment Commission approval.

Rural acreages on private well and septic; Greenbelt and escarpment overlays cover a majority of the town's land area. North-GTA snowfall of 152 cm and -5.4°C winters give Caledon a May-October working season - foundations for secondary suites go in before the ground closes, with interior finishing carried through the cold months.

"Secondary suite" is the Ontario planning term for a second self-contained dwelling inside the existing house, so the review in Caledon turns on the interior - separate kitchen and bath, an exit that does not pass through the primary unit, and rated separation between the two. Because the shell already exists, the schedule is driven by inspection sequencing rather than by weather: rough-in, framing and insulation inspections gate one another regardless of the May-October season. Bill 23 makes up to three units as-of-right on most serviced Caledon lots, so a secondary suite generally proceeds by building permit alone without a rezoning application.