The short answer

Measure it twice: closed as a sofa and fully open as a bed. Check the delivery size, mattress comfort and whether you can still walk around it at night.

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See examples, diagrams and measuring details

Measure two footprints

Record the sofa’s closed width and depth, then its full open length. Tape out the open footprint with clearance to walk around and make the bed. Check nearby doors, tables, radiators, and TV stands.

Compare the sleeping surface

Look at mattress or pad size, thickness, support, and how often guests will sleep on it. A pullout mattress, fold-flat futon, and trundle-style sleeper solve different problems; try the mechanism where possible.

Try the conversion

Ask how much force opening requires and where cushions go at night. Check whether one person can operate it and whether bedding has a storage spot.

Measure the delivery route

Sleeper mechanisms add weight and may not disassemble. Request the packaged size, overall weight, largest rigid part, delivery service details, and return terms.

Compare full cost

Include delivery, assembly, mattress accessories, and likely return fees. Buy the mechanism and sleeping comfort for how you will use it, not simply the smallest closed dimensions.

Ready to measure?

Check the size and the full delivery route before ordering.

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