How to size a lamp for your space
Measure clearance, not just the room
Bedside lamp height: total lamp + nightstand should put the bottom of the shade 24–27″ above the mattress for reading. Floor lamp: shade bottom at 58–64″ for ambient light, 38–42″ (over a chair) for reading. Shade diameter: about 60% of the lamp's base width and equal to about half the table's width for table lamps.
Walkways and door swing
Plan at least 30″ for primary walking paths and 24″ behind seating that backs up to a wall (e.g., dining chairs that need to slide out). Closet, oven, and refrigerator doors all need full swing clearance — a piece that fits the floor space but blocks a door is the wrong piece.
Delivery path before you order
Measure the narrowest point in the delivery path: front door, hallway turn, stairwell, elevator. A sofa that fits the room can still be impossible to deliver. The diagonal of a doorway is what matters, not the doorway width — tilting helps but not always enough.
Common mistakes
- Choosing a piece that fills the room dimensions exactly — rooms need negative space to feel comfortable.
- Ignoring the height of nearby fixtures (windowsills, light switches, baseboards) that limit where the piece can sit flush.
- Forgetting that rugs reduce usable clearance by 1–2″ on each side.