A fold up single bed is any one-person bed that collapses for storage: a wall-mounted Murphy bed, a wheeled rollaway frame, or a lightweight folding cot. The right pick comes down to three numbers you can measure in ten minutes: how much floor space the bed needs open, how deep the folded bed is, and how thick a mattress the frame will take. Get those right and the bed sleeps like a real bed instead of a punishment for your guests.
The three types, and who each one suits
Wall-mounted (Murphy or wall bed)
The mattress lives inside a cabinet bolted to the wall and swings down when you need it. Closed, a single wall bed cabinet usually sticks out about 15 to 18 inches, so it reads like a shallow wardrobe. Open, expect it to project roughly 80 to 90 inches from the wall, plus a walking lane of at least 24 inches beside or in front of it.
Best for: studios and home offices where the bed is used weekly and the room has to look like a room the rest of the time. Worst for: renters who can’t drill into studs. More on the layout side of this in our guide to a bed that folds into the wall.
Rollaway frame
A hinged metal frame on casters that folds in half, mattress and all, then rolls into a closet. This is the hotel-style option, and it’s the best middle ground: a real 5 to 8 inch mattress, no drilling, and setup in under a minute.
Best for: guest rooms that are also offices, or anyone who wants the bed gone by Monday. Watch the folded height, which often lands near 60 to 70 inches when it’s standing upright.
Folding cot
Steel or aluminum legs, a fabric or slat deck, and a thin pad. Cots fold flat, weigh the least, and cost the least. They’re also the narrowest — many sleep surfaces run 25 to 32 inches wide rather than a full 38.
Best for: kids’ sleepovers, camping, an emergency extra bed. Not for someone staying a month.
Measure these five things before you buy a fold up single bed
- Open footprint. A standard US twin mattress is 38 by 75 inches; twin XL is 38 by 80. A UK single is 90 by 190 cm (about 35 by 75 inches), and a small single is 75 by 190 cm. Frames add 1 to 3 inches on each side, so chalk out roughly 41 by 80 inches on the floor and see what it hits.
- Folded depth and height. Measure the closet, alcove, or wall gap where the bed will live. A typical reach-in closet is 24 inches deep — plenty for most rollaways folded, tight for some with thick mattresses.
- Doorways and turns. Interior doors are commonly 30 to 32 inches wide. If the folded bed is 40 inches wide, it has to go through sideways, and a tight hallway corner can stop it cold.
- Mattress thickness limit. Folding frames usually cap out around 6 to 8 inches because the mattress has to bend at the hinge. Wall beds often allow 10 to 12 inches. The spec sheet will say; if it doesn’t, assume thin.
- Weight capacity. Listed capacities vary a lot between a camping cot and a steel rollaway. Read the number, and read whether it’s static or for a sleeping adult.
Quick comparison
| Type |
Space when closed |
Typical mattress |
Setup time |
Best use |
| Wall / Murphy bed |
Cabinet about 15–18 in deep, stays put |
8–12 in, strapped in place |
Seconds, but two hands |
Daily or weekly use in a studio |
| Rollaway frame |
Folds to roughly 20–24 in deep, rolls away |
5–8 in foam or innerspring |
Under a minute |
Regular guests, flexible rooms |
| Folding cot |
Folds flat, slides under a bed or behind a door |
2–4 in pad, topper recommended |
A minute or two |
Occasional, travel, kids |
| Tri-fold foam mattress |
Stacks into a cube in a closet |
4–6 in, no frame at all |
Seconds |
Floor sleeping, tiny rooms |
Storing it so it actually stays out of the way
The storage plan matters more than the bed itself. A fold up single bed parked in the corner of the living room is just clutter with wheels.
- Give it a home, not a gap. Closet, under a stairwell, behind a door, or flat under a platform bed. Measure before you buy, not after.
- Strap it upright. A folded rollaway standing on end is tall and top-heavy. A cam strap or hook-and-loop strap around the frame and a wall cleat keeps it from tipping if someone bumps it.
- Cover the mattress. A zippered cover or an old duvet cover keeps closet dust and pet hair off the foam. Skip plastic bags for long storage — trapped moisture is how foam starts smelling like a basement.
- Air it out. Foam that’s been folded for months takes a set. Unfold it a few hours before bedtime and it’ll recover most of its loft.
- Lock the casters. If the bed has wheels, at least two should lock. Unlocked casters on hard floors mean the bed drifts every time someone rolls over.
If the folded bed has nowhere to go, the problem is storage, not beds. Our roundup of storage ideas for small bedrooms with no closets covers the vertical tricks that free up that slot.
Anchoring and safety
Wall beds hang off the wall, so the mounting is the whole safety story. Hit the studs, use the hardware that came with the kit, and don’t improvise with drywall anchors on a bed frame. The US Consumer Product Safety Commission’s Anchor It! campaign covers why furniture that leans or hangs needs to be fastened to structure, and Consumer Reports’ how-to on anchoring furniture walks through finding studs and choosing hardware.
Two more checks worth a minute: the lift mechanism on a wall bed should hold the bed at any angle rather than slamming down, and any folding frame should have a latch or lock that stops it folding while someone is on it.
Making a fold up single bed comfortable
The usual complaints about a fold up single bed are a ridge down the middle, a saggy deck, and a mattress you can feel the frame through. All three are fixable.
The hinge ridge. A folding frame has a bar where it bends, and thin mattresses telegraph it. A 2 to 3 inch foam topper on top of the existing pad hides it almost completely. Any thicker and you start fighting the fold.
Sag. Fabric decks stretch over time. Spring-suspension decks hold up better than fabric slings. If the deck already dips, a slatted roll-up base or a thin plywood sheet cut to 37 by 74 inches evens things out — just drill a few holes in the plywood so the mattress can breathe.
Bedding. Standard twin sheets fit a 38-inch bed fine. On narrow cots, twin fitted sheets bunch, so a flat sheet tucked hospital-style stays put better. Deep-pocket sheets are overkill on a 4-inch mattress.
Temperature. Beds that sit off the floor on a mesh deck breathe well but also let cold air under the sleeper. In a cool room, add a mattress pad or a folded blanket underneath rather than piling more on top.
Trade-offs worth knowing
- Cheap frames squeak. Thin tubing and loose bolts sing every time someone shifts. Retightening every bolt after the first night fixes most of it.
- Wall beds are a commitment. Installation means holes in the wall and, in a rental, a conversation with the landlord. Freestanding wall beds exist but need wall clearance anyway.
- Cots are for short stays. Narrow, low, and firm. Fine for a weekend, rough for a two-week visit.
- Folded doesn’t mean invisible. A folded rollaway still occupies a closet you may need for coats.
Still weighing options? Compare with a foldable bed frame, look at rollaway beds for guests, or check the bigger picture in our guide to the best beds for small rooms.
FAQ
Can an adult sleep on a fold up single bed every night?
On a wall bed with a proper 8 to 12 inch mattress, yes — it’s the same mattress you’d sleep on in a normal frame. On a folding frame with a 5 to 8 inch mattress, most adults do fine with a topper. A camping cot is a short-term answer, not a nightly one.
What size sheets do I need?
Twin (38 by 75 inches) for most US frames, twin XL if the bed is 80 inches long, and UK single bedding for a 90 by 190 cm bed. Measure the mattress rather than trusting the label on the box.
Rollaway bed or cot — what’s the real difference?
A rollaway has a rigid frame on locking casters and takes a thicker mattress; it stays made up when folded. A cot is lighter, packs smaller, usually narrower, and needs the bedding stripped each time.
Will a fold up single bed fit through a standard door?
Usually, but check. Most fold to around 40 inches wide, and interior doors run 30 to 32 inches, so the bed goes through on its side. Tight hallway corners are the usual failure point.
How do I keep the mattress from sliding off when the bed folds?
Wall beds use straps across the mattress — use them. On rollaways, a tight fitted sheet plus a strap or bungee around the folded halves keeps everything together while you wheel it.
Is a fold up single bed cheaper than a sofa bed?
Generally yes, because you’re buying a frame and a thin mattress instead of a sofa. The trade-off is that a sofa bed earns its floor space during the day and a folding bed doesn’t.
Updated September 2026.
