Two sofas can have the same outside width and feel completely different because the arms and cushions use space differently.
Take a phone photo of dimensions, labels and the delivered condition. Those small records are easy to keep and useful if the item has to be moved, cleaned, serviced or returned later.
Overall width is the room footprint
This is the edge-to-edge measurement that matters for wall fit and layout.
For “Overall width is the room footprint,” write the measurement down and photograph the tape in place. Memory is a poor substitute when a large item is already on the truck.
Seat width tells you usable space
Thick arms can reduce how many people fit despite a large overall number.
For “Seat width tells you usable space,” write the measurement down and photograph the tape in place. Memory is a poor substitute when a large item is already on the truck.
Seat depth changes posture
Deep seats can feel lounge-like but may be uncomfortable for shorter users without a back pillow.
For “Seat depth changes posture,” write inclusions, exclusions and timing beside the number. A price without scope creates a second negotiation later.
Seat height affects standing
Lower seating may look modern and be harder for some users to rise from.
For “Seat height affects standing,” write the measurement down and photograph the tape in place. Memory is a poor substitute when a large item is already on the truck.
Package dimensions decide delivery
Always check the carton or module size for doors, stairs and elevators.
For “Package dimensions decide delivery,” save the service level, appointment rule and damage procedure with the order. Logistics promises should be as specific as product promises.
What the specification cannot tell you
For this article, treat the number or term as one input. Construction, user size, room conditions, manufacturer instructions and normal wear can change how the same specification feels in practice.
Before you commit
For this article, check the exact product dimensions and instructions, building access, delivery level, return terms and the household constraint that matters most. If one of those is still vague, pause long enough to get the answer. For this topic, the first things I would put on that review are overall width is the room footprint, seat width tells you usable space.