Start with a sofa you already know. Measure its outside width and depth, then sit in your usual spot and measure the usable seat in front of the back cushion. Those numbers tell you two different things: what fits in the room and what feels comfortable when you sit down.
Mark the full footprint on the floor
Use painter’s tape to mark the widest and deepest points of the frame. Include the arms and the curve of the back. Leave the tape in place while you open nearby doors, walk past the coffee table and pull out any dining chairs that share the space. A footprint that works against a wall can feel quite different in the middle of the room.
Compare seat depth with a sofa you like
The Pera Compact Sofa is 75.5 inches wide and 34 inches deep, with a 20-inch seat depth. The Copley Deep Sofa is 83.9 inches wide and 40.6 inches deep, with a 35-inch seat depth. That gives Copley 15 more inches of seat depth, although its frame takes up only 6.6 more inches from front to back. Use the listed seat measurements when deciding whether you want to sit upright or stretch out.
Measure the whole delivery route
Write down the clear opening at the narrowest doorway, including any space the open door itself takes up. Measure hallway turns, stairs, landings and the elevator opening and interior if applicable. A sofa that fits through a straight doorway may still have too little room to turn. Compare these measurements with the packaged dimensions for the exact model and finish. If those dimensions are missing, ask us for them before ordering. Only count on removable legs or separate modules when the model specifications confirm them.
Allow for the shape of the sofa
For a curved sofa, mark the deepest point of the arc on the floor before positioning the coffee table. For a modular or sleeper sofa, check each packaged module or the fully opened bed dimensions. The seated depth alone will not tell you whether a sleeper clears the table when open.
Once you have your maximum width, outside depth and preferred seat depth, compare the sofa collection using those three measurements.