If you are measuring a room and asking how thick is a Murphy bed, you are usually trying to answer a more practical question - how much space will this bed actually take from my room every day? That is the right question, because Murphy bed thickness is not one fixed number. It changes based on mattress size, cabinet design, hardware, face style, and whether you want extras like shelving or wardrobes built in.
For most homeowners, the closed depth of a standard Murphy bed cabinet lands somewhere around 16 to 24 inches. That is the number people usually mean when they ask about thickness. But the better answer is that thickness depends on whether you are looking at the mattress platform itself, the face of the cabinet when closed, or the full built-in footprint including side storage.
How thick is a Murphy bed in most homes?
In everyday terms, a Murphy bed is often about 16 to 20 inches thick when closed for a fairly streamlined design. Some models push closer to 22 or 24 inches, especially when they are built for thicker mattresses, heavier wood construction, or integrated storage.
A minimalist wall bed made to keep a low profile can stay on the slimmer side. A furniture-style Murphy bed with substantial face panels, trim, and cabinetry usually reads thicker because it is designed to look like a permanent built-in rather than a thin mechanical unit.
That is why there is no single industry-wide number that fits every project. A queen Murphy bed in a clean painted finish may have a different depth than a reclaimed wood king bed with side cabinets, even if both use quality hardware.
What "thickness" actually means
This is where room planning can go wrong. People often use one word for three different dimensions.
Closed depth
This is the depth from the wall to the front of the cabinet when the bed is stored upright. If you are worried about floor space, walkways, or whether the unit will crowd a home office, this is the number that matters most.
Mattress allowance
Murphy beds are built around a maximum mattress thickness they can safely hold when folded up. Many designs accept mattresses in roughly the 8 to 12 inch range, though the exact limit depends on the mechanism and cabinet construction.
Open projection
When the bed is down, its footprint is much larger than the closed depth. That matters for traffic flow, rugs, desks, and nightstands. A bed that looks compact against the wall still needs full sleeping clearance when open.
Typical Murphy bed thickness by type
A basic vertical Murphy bed with no side storage is usually the slimmest option. Many of these fall around 16 to 18 inches deep when closed, assuming a standard mattress and straightforward face design.
A more furniture-driven cabinet, especially one built from solid wood or designed with decorative fronts, often lands closer to 18 to 22 inches. That extra depth can come from trim details, sturdier framing, or the need to comfortably house the mattress and mechanism without forcing a tight fit.
Horizontal Murphy beds can vary quite a bit. In some rooms they solve ceiling-height issues beautifully, but the overall look can feel broader across the wall. Their depth may be similar to vertical beds, though the wall space they consume is different.
Murphy beds with side bookcases, wardrobes, or desk features should be considered as full wall systems rather than just beds. The bed cabinet itself may still be within a normal depth range, but the complete installation can feel visually larger and may include adjoining components with different measurements.
Mattress thickness changes the answer
One of the biggest variables is the mattress itself. A Murphy bed is not simply a box around a mattress. It is a system where hardware, weight balance, and clearance all have to work together.
If the bed is designed for an 8 inch mattress, building around a 12 inch mattress adds bulk and can change how the unit closes, how the lift mechanism performs, and how cleanly the face sits when upright. A thicker mattress is not always better. In Murphy beds, comfort comes from the right mattress for the system, not the tallest mattress you can find.
This is especially important for homeowners who assume they can use any mattress they already own. Sometimes that works. Sometimes it creates problems with closure, bedding retention, or long-term hardware strain. A properly built Murphy bed should be matched to realistic mattress dimensions from the start.
Why custom craftsmanship matters here
This is where custom work earns its keep. In a mass-produced unit, thickness is usually fixed by a standard design. That may be fine for a simple guest room, but it can become limiting in tighter spaces or design-driven homes.
With a custom Murphy bed, the cabinet can be designed around the room instead of forcing the room to adapt. If you need a shallow-looking profile for a narrow office, that can influence material choices, face treatment, and storage layout. If you want a heavier wood species, a reclaimed wood front, or integrated wardrobes, thickness can be balanced with overall proportions so the installation still feels intentional.
At Oldham Wood, that kind of planning is part of the work. A Murphy bed should not just fit the mattress. It should fit the architecture, the way you use the room, and the visual weight you want the piece to carry.
How thick is a Murphy bed compared to other furniture?
A closed Murphy bed is often deeper than a standard bookshelf but not wildly different from many large storage cabinets or wardrobes. That surprises some buyers. They picture a folded bed as a bulky wall block, when in reality a well-designed Murphy bed can sit in the room with a footprint that feels similar to other substantial furniture.
The difference is in function. A wardrobe stores clothing all the time. A Murphy bed gives that wall back to you during the day and turns the room into a sleeping space at night. So even if the closed depth is 18 or 20 inches, the room can still feel dramatically larger because the bed is not permanently occupying floor space.
Room planning mistakes to avoid
The first mistake is focusing only on the closed thickness. Yes, that matters, but you also need enough clear floor area to open the bed comfortably.
The second mistake is forgetting baseboards, outlet locations, window trim, and other wall conditions. These details can affect how tightly the cabinet sits to the wall and whether any small fillers or scribing are needed.
The third mistake is assuming side storage has the same depth as the bed cabinet. Sometimes it does. Sometimes designers intentionally vary the depth to improve the look or function.
And finally, do not overlook ceiling height. Murphy beds need vertical room for installation and operation, especially in queen and king sizes.
The best way to measure for your space
Start with the wall width and ceiling height, then measure how much depth you can comfortably give up when the bed is closed. After that, check the open floor area in front of the wall. Think about desk chairs, radiators, doors, and circulation paths.
If this is going in a home office or guest room, consider the room in both modes. During the day, you want enough floor clearance that the unit does not feel heavy or intrusive. At night, you want enough open space that using the bed feels natural, not like rearranging the whole room.
That is usually the point where standard dimensions stop being enough and a design conversation becomes useful. The right Murphy bed is not just the one with the smallest thickness. It is the one with the right proportions for how the room actually lives.
So, how thick should your Murphy bed be?
For many homes, somewhere in the 16 to 20 inch range is a comfortable target for the main cabinet. If you are adding decorative woodwork, a thicker mattress, or integrated storage, a deeper build may make more sense. Neither is automatically better.
The real goal is balance. You want a bed that closes cleanly, opens easily, supports a proper mattress, and looks like it belongs in the room. In a tight condo, that may mean keeping the profile lean. In a guest suite or second home, it may mean building a fuller furniture wall with storage and character.
If you are planning carefully, the question is not only how thick is a Murphy bed. It is how thoughtfully that thickness is used. Get that part right, and the piece stops feeling like a compromise and starts working like one of the smartest pieces of furniture in the house.