Backyard Home Offices in East York - Design, Permits, Construction

East York's wartime housing stock sits on some of the smallest lots inside the amalgamated city, so the binding constraint here is almost never lot coverage - it is the angular plane measured off the rear property line. We design East York garden suites around that plane first and the floor plan second. City of Toronto by-laws apply; East York's tight lots make the 4 m rear-yard setback and 6 m height cap the binding constraints on most designs.

A backyard office is judged by the building department on one question: is it habitable space or an accessory structure? A unit with plumbing and year-round occupancy is reviewed in East York as a dwelling, with everything that implies for servicing and setbacks. Insulation and heating are the whole point in a climate averaging -3.8°C - a shed-grade envelope is unusable from November, so we build to dwelling-standard walls, glazing and a heat pump.

Data and power are trenched from the house on the same run as the water line, which is why a plumbed office costs far less if it is decided before the trench is dug rather than after.