Furniture assembly in Richmond Hill often lands in a room with a sloped or vaulted ceiling. The 1990s houses through Bayview Hill and Devonsleigh have generous primary bedrooms where the ceiling climbs across the room, and a full-height wardrobe only works on one wall.
I check that before building rather than after. The same goes for the study and library shelving people add later: measured, plumb, anchored into studs, then the packaging leaves with me. The quote is free and the price is agreed before I start.