Accessible and Barrier-Free Units in Richmond Hill - Design, Permits, Construction

The Oak Ridges Moraine Conservation Plan covers Richmond Hill's northern third, and on those Jefferson and Oak Ridges lots the tree-protection and grading requirements routinely cost more than the ADU's foundation. We price a moraine site and a Crosby site as two different classes of project. Richmond Hill permits additional dwelling units subject to Oak Ridges Moraine Conservation Plan constraints on the northern third of the town.

Sloped and treed lots along the moraine where site grading and tree protection drive cost more than the building itself. Richmond Hill sees 139 cm of snow and -4.6°C winter averages. Ontario's 1.2 m frost-depth requirement governs every footing we pour for accessible and barrier-free units, and the April-November season sets the excavation window.

Accessible design is dimensional before it is decorative: a barrier-free Richmond Hill unit needs a level entry route from the driveway, 34-inch clear door openings, and turning circles that a standard 500 sq ft plan does not leave room for. We set the finished floor to grade at design stage, which changes the foundation detail on a 1.2 m footing and has to be resolved before the permit set is drawn, not after. 139 cm of annual snow makes the level entry a maintenance question too - we detail a covered, drained approach rather than a flush threshold that ices over.