A prison cell in the US looks like a small concrete room about the size of a parking space, furnished with a bolted-down bunk, a stainless steel toilet-and-sink combination, and almost nothing else. Walls are painted concrete or masonry block. The door is a heavy sliding steel slab with a narrow observation window. Any window to the outside is a slit. Every edge is rounded, every fixture is anchored, and the overall feel is industrial rather than domestic. The exact look shifts with the facility’s security level and age, but that basic picture holds across the system.
How Big Is a Cell
Older cells often measure around 6 by 8 feet, roughly 48 square feet of floor space. Newer federal construction runs larger. The Federal Bureau of Prisons uses a design standard of 75 square feet per cell in medium-security institutions.1Federal Bureau of Prisons. Program Statement 1060.11, Rated Capacities for Bureau Facilities
The BOP uses different square-footage thresholds to decide whether a cell can hold one or two people. In high-security institutions, a cell must be at least 75 square feet before any portion of the housing can be rated for double occupancy. Medium-security cells need at least 70 square feet, low-security 65, and minimum-security 55.1Federal Bureau of Prisons. Program Statement 1060.11, Rated Capacities for Bureau Facilities Below those numbers, the cell is rated for a single person. Smaller older cells are still in use; they’re just not supposed to hold more than one inmate.
Whatever the total floor area, usable space is always smaller than the number on the drawing. The bunk, the toilet, and any desk or stool take up a sizable share of the room, and what’s left is the strip of floor an inmate can actually stand on.
Walls, Door, and Window
Cell walls are almost always poured concrete or concrete masonry block, painted white or a pale institutional color. Light paint makes contraband, graffiti, and damage easier to spot during inspections. In higher-security facilities, walls are thicker and sometimes reinforced with rebar so inmates can’t chip through.
The door in a modern prison is a heavy slab of steel that slides on a track, operated electronically from a central control booth. A small observation window of shatterproof polycarbonate lets officers see in without opening the door. Most doors also have a narrow slot through which meal trays pass. Older jails still use the floor-to-ceiling bar design most people picture from movies, but newer construction has moved almost entirely to solid doors because they’re harder to reach through, harder to use as leverage, and better at containing noise and fire.
Windows to the outside, where they exist at all, are narrow. High-security cells often have a single slit. ADX Florence’s supermax cells, for instance, have a four-inch-wide window. That gives a sliver of daylight but no useful view of the grounds. Lower-security facilities sometimes use larger windows with translucent polycarbonate panels, always configured to prevent escape or the passage of contraband. Some facilities skip exterior cell windows entirely and rely on clerestory windows or skylights in the adjacent dayroom.
The Toilet-Sink Unit
The most distinctive thing in an American prison cell is the combination toilet-and-sink. It’s a single stainless steel fixture, with the toilet on the bottom and a small sink basin on top or welded to the back, sharing the same water supply. When the toilet flushes, water refilling the tank runs through the upper basin first, so an inmate can wash their hands. The design eliminates extra pipes, joints, and fixtures that could be tampered with.
These units are made from heavy-gauge type 304 or 316 stainless steel because the material absorbs impacts without shattering into usable shards the way porcelain would. Edges are rounded, surfaces sloped, and seams welded shut, so there’s nowhere to attach a ligature or hide contraband. Many units use a recessed push-button bubbler that sits flush with the surface and dispenses water for a timed interval, usually about ten seconds. Some facilities program electronic valves that lock after two flushes within a set period to prevent flooding.
The unit bolts to the wall from behind. All plumbing runs through a narrow maintenance corridor called a “chase” that staff access from outside the cell. A plumber can fix a toilet without ever entering the cell or interacting with the inmate.
The Bed and Other Furniture
The bed is either a concrete slab projecting from the wall or a metal bunk frame bolted to the wall and floor with tamper-resistant hardware. In higher-security settings, concrete is preferred because it can’t be disassembled and has no removable parts. The mattress is thin, usually about four inches of compressed foam in a vinyl cover, resting directly on the slab or frame. Many newer facilities use seamless, tamper-resistant mattresses to prevent inmates from tearing them open to hide contraband or pull out ligature material.
Beyond the bed and toilet, a cell might contain a small desk and stool, both poured concrete or molded heavy-duty plastic. These are fixed in place and follow the same design philosophy as the toilet unit: rounded edges, sloped tops, no removable components. In some modern facilities, molded plastic furniture has replaced concrete because it’s lighter to install while still being ligature-resistant and impossible to break into useful weapons.
A small polished stainless steel mirror sits on the wall near the sink. Glass is prohibited. Some cells include a narrow shelf or a small locker for personal items. In many older facilities, inmates store everything in a clear plastic bin under the bunk.
Why Nothing Sticks Out
Look closely at a modern prison cell and the pattern becomes obvious: there are no protruding edges, hooks, or attachment points anywhere. This is anti-ligature design, and it drives nearly every decision about how a cell is built and furnished. Suicide by hanging is one of the leading causes of death in custody, and correctional architects have spent decades eliminating anchor points.
Sprinkler heads are tamper-resistant institutional models with smooth, flush-mounted bodies that can’t support weight or be gripped. Light fixtures are recessed into the ceiling behind shatterproof lenses. Ventilation grates are welded flush. Door hinges are concealed. Clothing hooks, where they exist, break away under a few pounds of downward pressure. Every fixture has to satisfy two competing mandates at once: usability, and the impossibility of misuse.2U.S. Department of Justice, Civil Rights Division. ADA / Section 504 Design Guide: Accessible Cells in Correctional Facilities
How Cells Differ by Security Level
“Cell” conjures a single image, but the actual living quarters vary enormously by classification. Federal facilities break into five tiers, and what counts as housing looks dramatically different at each one.
Minimum and Low Security
Minimum-security institutions, often called federal prison camps, don’t use cells at all. Inmates sleep in open dormitories with rows of bunk beds, sometimes dozens of people in a single room. These facilities have limited or no perimeter fencing and emphasize work programs.3Federal Bureau of Prisons. About Our Facilities The feel is closer to a military barracks than most people’s mental picture of prison.
Low-security federal correctional institutions add a double-fenced perimeter but keep housing primarily dormitory or cubicle style. Cubicle housing partitions a large room into semi-private spaces using concrete block walls, typically less than six feet high.3Federal Bureau of Prisons. About Our Facilities
Medium and High Security
Medium-security facilities are where the standard cell most people picture actually appears. Double fences with electronic detection systems, cell blocks with individual rooms, and tighter internal controls.3Federal Bureau of Prisons. About Our Facilities The cells themselves are concrete, furnished with the steel toilet-sink combo and a metal or concrete bunk, designed for one or two occupants.
High-security US Penitentiaries are the most restrictive general-population facilities. The perimeters feature walls or heavily reinforced fences, guard towers, and the highest staff-to-inmate ratios in the system. Cells are primarily single or double occupancy with concrete furnishings that can’t be moved or disassembled. Doors open and close electronically on a schedule, and movement happens in supervised groups or individually.3Federal Bureau of Prisons. About Our Facilities
Supermax
Supermax sits at the top of the hierarchy, designed for inmates who have committed violence in other prisons or pose extraordinary escape risks. ADX Florence in Colorado, the only federal supermax, is the starkest version of what a cell can be. Each cell measures roughly 7 by 12 feet, is soundproofed, and contains a poured-concrete bed with four-point restraint capability, a concrete desk and stool, and the standard stainless steel toilet-sink unit. A single four-inch window slit provides the only natural light. Everything is immovable.
Inmates in supermax housing spend 22 to 23 hours a day in their cells, sometimes 24 on weekends or holidays. The remaining hour is typically used for solitary exercise in a small concrete recreation area. Meals arrive through the door slot, and even recreation happens alone.
What Inmates Keep Inside
A cell is also someone’s living space, and the small collection of personal items an inmate is allowed can make the difference between a bare concrete box and something marginally more bearable. The Federal Bureau of Prisons limits what inmates can possess and caps many categories by number.4Federal Bureau of Prisons. Inmate Personal Property
An inmate may keep one approved radio, one watch worth no more than $100 with no stones and no signal-sending capability, up to 25 loose photographs plus a photo album, and one religious medallion valued under $100. Commissary purchases such as soap, snacks, stationery, and limited clothing in prescribed colors round out most of what fills the storage space.4Federal Bureau of Prisons. Inmate Personal Property
Tablets have become increasingly common in cells across the country. Vendors like ViaPath Technologies and Securus Technologies provide them to correctional systems, sometimes at no cost to inmates, with features that can include e-messaging, video calls, music downloads, games, and movie rentals. In the federal system, tablets have been available since 2022 with more limited functionality: music and games were enabled, but messaging and video calls were initially blocked. The tablets come with earbuds and a charger and are stored in the inmate’s designated property area.
All personal property must fit in a locker or designated storage container within the housing area. Staff can restrict accumulation at any point if items become a fire, sanitation, or security hazard.4Federal Bureau of Prisons. Inmate Personal Property
When Two People Share a Cell Built for One
Everything described above is how facilities are designed to work. The reality in many institutions is that cells designed for one person hold two. Double-bunking is widespread across federal and state systems as a response to chronic overcrowding. When a second bunk is added to a single-occupancy cell, the usable space shrinks dramatically. A 70-square-foot cell that was tight for one person becomes genuinely cramped when shared, with two adults navigating around each other to reach the toilet, the bunks, and the door.
The BOP’s capacity guidelines acknowledge this by setting thresholds for when double-bunking is permissible. In medium-security housing, at least 70 square feet is required before any cells can be rated for double occupancy, and even then, only half the cells are supposed to be doubled. The other half stay single. In low-security and minimum-security facilities, 100 percent of qualifying cells can be rated for double occupancy, reflecting the lower-risk population and the use of more open housing designs.1Federal Bureau of Prisons. Program Statement 1060.11, Rated Capacities for Bureau Facilities
Dormitory housing at lower security levels is a different version of the same problem. Dozens of inmates share a single large room filled with bunks, with communal bathrooms and little personal space. The square footage per person may meet standards on paper, but the absence of physical barriers means noise, light, and other people’s schedules are constant. For many inmates, the cell itself is less of a hardship than the loss of any private space at all.