Furniture assembly in Markham frequently means a three-storey freehold townhouse. In Cornell, Wismer and Greensborough the staircase runs up the middle of the house and turns at every floor, and the bedroom wanting the wardrobe sits two flights above the garage.
So I carry flat and build on the floor the piece is staying on. It is the only sensible way in those houses, and it saves your railings and drywall corners along the way. At the end the cartons come back down flattened and leave with me.