The guest-room sweet spot
The full-size murphy bed, with its 54 by 75-inch mattress, is the size nobody regrets. It's wide enough to sleep two adults for a weekend without anyone filing a complaint, narrow enough to fit walls where a queen would crowd, and cheap enough to build that the lumber bill won't make you flinch. If your murphy bed's job is "guest room that isn't a bedroom," the full is almost certainly your size. It hits the exact middle of every tradeoff: cost, weight, footprint, and comfort.
Dimensions that matter
A vertical full cabinet runs about 60 inches wide, 81 inches tall, and 16 inches deep. That's six inches narrower than a queen, which is often the difference between fitting beside a window and not. Open projection is about 54 inches from the wall, same as a twin, because the mattress length is the same 75 inches. Horizontal full: roughly 81 inches wide by 60 inches tall. Five feet of wall width plus trim clearance is the planning number. Ceiling needs are modest at 7 feet clear for vertical.
- Mattress: 54 x 75 in., 8 to 11 in. thick
- Vertical cabinet: ~60 in. wide x 81 in. tall x 16 in. deep
- Horizontal cabinet: ~81 in. wide x 60 in. tall x 16 in. deep
- Open projection from wall: ~54 in.
- Wall width needed: 5 ft plus trim clearance
Cost and time
Three sheets of 3/4-inch plywood ($180 to $240), a full-size kit ($330 to $400), fasteners, glue, and finish ($90 to $130). Total: $600 to $800 for a finished full that would retail pre-built at $1,800 to $2,500. Build time for a first-timer: 25 to 35 hours. The full is the size where the DIY savings get serious: you're saving well over a thousand dollars for a long weekend's work, and the result is solid wood and plywood instead of the particleboard that ships in most flat-pack guest beds.
Full vs. queen: making the call
The queen sleeps two more comfortably and resells better. The full fits more rooms, costs about $150 less to build, and lifts easier. Here's the tiebreaker: measure your wall. If a queen cabinet (66 inches wide) leaves less than 18 inches to the nearest door, window, or corner, build the full. A bed that crowds the room gets used less, and a murphy bed that doesn't get used is just an expensive cabinet. If the wall takes a queen comfortably, the extra width is worth it for couples. There's no wrong answer, only a wrong measurement.
Designing around a full
A full cabinet's 60-inch width is a friendly number for room design: it centers on a 5-foot wall section, flanks nicely with a bookshelf on each side, and leaves real floor space in a 10x10 room with the bed open. Bedding is easy: full sheets are everywhere and cheaper than queen sets. And if the room doubles as an office, the closed full cabinet is narrow enough to share a wall with a desk without the room feeling like a bedroom that moonlights as an office. It reads as intentional, which is the whole trick with small multi-use rooms.
Frequently asked questions
Can two adults sleep on a full murphy bed?
Yes. 54 inches wide is cozy but completely workable for a weekend. It's the standard "guest bed for couples" size. For nightly use by two people, a queen is more comfortable long-term.
How is a full different from a queen to build?
Nearly identical process, slightly smaller numbers: one fewer sheet of plywood, six inches less cabinet width, a lighter lift. If you can build one, you can build the other. The plans differ only in dimensions.
Will a full murphy bed fit a 54x75 mattress I already own?
Yes, that's the standard full size. Just check thickness against your kit's rating (usually 10 to 12 inches max) and strap it to the platform. An old innerspring works fine as long as it isn't a 14-inch pillow-top.
Is full or queen better for resale value?
Queen, marginally: buyers expect queens in guest rooms. But a beautifully built full beats a cramped queen every time. Fit the room first; the market second.