The International Residential Code sets the minimum for any habitable room, bedrooms included: at least 70 square feet, and at least 7 feet in every direction. So the smallest whole-foot bedroom is a 7×10. In our bedroom layout planner, a 7×10 takes a twin or a full only with one side of the bed given up, pushed against a wall for the most floor. An 8×9 (72 sq ft) is the smallest whole-foot room where a twin gets 24 in of floor on both sides with the door near a corner, set a little off-center; in an 8×10 a full or a queen still fits only with one side open.
The code tells you how small a bedroom can be. It doesn't tell you what fits in it. For that we ran the bedroom layout planner on every whole-foot room from 7 to 14 feet one way and 8 to 16 feet the other: 51 sizes, with a twin, full, queen or king bed, alone or with a 32 × 18 in dresser, a 48 × 24 in desk or both, at the planner's three clearance settings, with both sides of the bed open or just one, and with the door in 12 places. That's 58,752 runs. A layout counts only if it passes every check: the floor beside and past the bed, room to open a drawer and pull out the desk chair, the door's swing, and a walking route from the door to all of it.
The minimum bedroom size in the building code
The International Residential Code (IRC) has two rules for the size of a habitable room. Section R304.1: "Habitable rooms shall have a floor area of not less than 70 square feet (6.5 m²)." Section R304.2: "Habitable rooms shall be not less than 7 feet (2134 mm) in any horizontal dimension." Kitchens are the one exception to both. A bedroom counts: Fine Homebuilding's summary of the code describes habitable space as space "intended for living, sleeping, eating, and cooking."
Both rules apply at once. A 7×10 is 7 × 10 = 70 sq ft and passes. A 6×12 has more floor, 72 sq ft, but fails, because 6 feet is under 7. An 8×9 (72 sq ft) passes. A 7×9 (63 sq ft) and an 8×8 (64 sq ft) don't. This page covers only these size rules; your city or county may have its own, so check with the local building department before calling a small room a bedroom.
What fits in a 7×10 and an 8×10 bedroom
Here is what the planner fits in each room at its standard setting, 24 in beside and past the bed, with the door near a corner of a long wall. "One side open" means it only fits at the planner's "One side is enough" setting: one long side of the bed gets its 24 in strip and a path to it, and the other side can be against a wall. "Up to" is the widest open side among the layouts it lists.
| Bed or furniture | 7×10 (70 sq ft) | 8×10 (80 sq ft) |
|---|---|---|
| Twin 42 × 79 in | One side open, up to 41 in | Both sides open, 27 in each |
| Full 58 × 79 in | One side open, up to 25 in | One side open, up to 35 in |
| Queen 64 × 84 in | No | One side open, up to 31 in |
| King 80 × 84 in | No | No |
| Twin and a dresser | No | One side open |
| Twin, desk and dresser | No | Only at 22 in, one side open |
bedroom layout planner, standard setting. Bed frames are the mattress plus about 4 in. Dresser 32 × 18 in, desk 48 × 24 in, a 30 in door near a corner of a 10-foot wall and a 48 in window on the wall across from it.
7×10: no bed fits with both sides open. A twin needs 42 + 24 + 24 = 90 in (7 ft 6 in) of wall for that, and 86 in even at the planner's tightest 22 in setting, but a 7-foot wall is 84 in. Turned the other way, the bed needs 1 + 79 + 24 = 104 in from the headboard wall to the wall opposite (the planner sets every piece 1 in off the wall), and the room is 84 in across. For a twin with both sides open, the planner's only suggestion is to give up one side. Against a wall, a full fits too: 1 + 58 + 24 = 83 in, just inside 84 in. A queen would leave 84 − 1 − 64 = 19 in, so it doesn't fit at all, and at 24 in no dresser or desk fits with any bed. Every 7-foot-wide room in our runs was the same: no bed with both sides open, at any setting.
8×10: a twin centered on an 8-foot wall leaves 96 − 42 = 54 in, so 27 in on each side. A full needs 58 + 48 = 106 in for both sides, so it fits only with one side open (up to 35 in on that side), and so does a queen, with 96 − 1 − 64 = 31 in. A king leaves 96 − 1 − 80 = 15 in and doesn't fit. A twin and a dresser fit at 24 in with the twin against a wall (53 in of floor on its open side), and a twin, desk and dresser fit only at the 22 in setting (Layout C below). One foot longer, a 7×11 also takes a twin and a dresser with one side open.
Small bedroom sizes: the smallest room for each bed
Moving up a bed size costs floor. Here is the smallest whole-foot room, by floor area, that meets the code and fits each bed at the planner's 24 in setting.
| Bed | Both sides open | One side open | Both sides open, with a dresser |
|---|---|---|---|
| Twin | 8×9 (72 sq ft) | 7×10 (70 sq ft) | 9×10 (90 sq ft) |
| Full | 9×10 (90 sq ft) | 7×10 (70 sq ft) | 9×12 (108 sq ft) |
| Queen | 10×10 (100 sq ft) | 8×10 (80 sq ft) | 10×11 (110 sq ft) |
| King | 10×11 (110 sq ft) | 9×11 (99 sq ft) | 10×13 (130 sq ft) |
bedroom layout planner, standard setting, door near a corner of a long wall. Headboard wall for 24 in on both sides: twin 90 in, full 106 in, queen 112 in, king 128 in; from the headboard wall to the wall opposite: 104 in for a twin or full, 109 in for a queen or king. Each room was also solved mirrored, and a layout found either way counts.
Without the code's floor, the planner would put a twin against a wall in a 7×9, but at 63 sq ft that room is under the 70 sq ft minimum. For the queen and king in detail, see what size room a queen bed needs and what size room a king bed needs.
3 small-bedroom layouts, drawn by the bedroom layout planner
Each plan is the planner's own drawing and passes all of its checks at the setting shown. Hatched areas are the floor each check keeps clear, the dashed arc is the door's swing and the pale bar is the window. The grid is 1 foot.
Layout A: A full bed in a 7×10
All checks pass, one side open
At the "One side is enough" setting, the full goes in the top left corner, 1 in off the left wall. That leaves 84 − 1 − 58 = 25 in on the open side, along the window wall, and 120 − 1 − 79 = 40 in past the foot. The door near the bottom of the left wall swings into that path.
Best for: one sleeper who wants more than a twin in a room at the code minimum.
The trade-off: only one side of the bed can be reached, and no dresser or desk fits, so clothes need a closet.
Layout B: A twin in an 8×10, both sides open
All checks pass
Centered on the top wall, the twin leaves 96 − 42 = 54 in, so 27 in on each side, and 120 − 1 − 79 = 40 in past the foot. With the door near a corner, the only smaller room in our runs that keeps both sides of a bed open is an 8×9, where the twin has to sit off-center (30 in on one side, 24 in on the other) to clear the door's swing, with 28 in past the foot.
Best for: a child's room or a guest room where the bed is made from both sides.
The trade-off: a dresser fits only if one side of the twin is given up, and the 27 in sides take nightstands up to 24 in wide.
Layout C: A twin, desk and dresser in an 8×10
All checks pass at 22 in, one side open
At the planner's Minimum setting (22 in paths, 26 in for the desk chair, 16 + 15 = 31 in at the dresser) with one side open, the twin goes in the top left corner. The desk stands on the right wall, 96 − 1 − 42 − 24 − 1 = 28 in from the bed, and the desk chair uses that gap. The dresser is in the bottom right corner with more than 60 in of floor in front of it, and 40 in is left past the foot of the bed.
Best for: a student's room or a home office that sleeps one.
The trade-off: it passes only at 22 in paths, the desk chair pulls out into the one path beside the bed, and the desk sits in front of the window.
The numbers we checked
These are the sizes and clearances behind every table and plan on this page.
The 70 sq ft and 7 ft are the IRC's (Sections R304.1 and R304.2), the 24 in is Houzz's minimum for minor paths (it gives 30 to 48 in for main routes), the mattress sizes are Amerisleep's and the desk chair space comes from House Plans Helper. The rest are the bedroom layout planner's own settings.
- The room both ways, wall to wall. The code wants at least 7 ft in every direction and 70 sq ft in all.
- Your bed frame, not just the mattress. Ours are the mattress plus about 4 in: a twin 42 × 79 in, a full 58 × 79 in.
- The wall for the headboard: 90 in (7 ft 6 in) gives a twin 24 in on both sides; a full needs 106 in (8 ft 10 in).
- Where the door is and which way it swings, and the dresser's depth plus 16 in for an open drawer.
More small rooms: 9×10 and 9×11 bedroom layouts, two beds in a small room and the bedroom layout ideas. For walkway widths around the house, see how much space to leave between furniture; for a rug, what size rug for a full or twin bed. Already furnished? Check the gaps with the Clearance Checker.
Questions
What is the minimum bedroom size?
Under the International Residential Code, 70 square feet, and no less than 7 feet in any horizontal dimension (Sections R304.1 and R304.2). The smallest whole-foot room that meets both is a 7×10.
How small can a bedroom be?
By the code, 70 sq ft and 7 feet each way. In practice, a 7×10 holds a twin or a full against a wall and nothing else at 24 in paths. An 8×9 (72 sq ft) is the smallest whole-foot room in our runs where a twin kept both sides open with the door near a corner.
How many square feet is an 8×10 room?
8 × 10 = 80 square feet, 10 more than the code minimum. A 7×10 is 70.
What size bed fits in an 8×10 bedroom?
A twin with 27 in on both sides. A full or a queen fits only with one side open, with up to 35 in or 31 in on that side. A king doesn't fit.
What fits in a 7×10 bedroom?
A twin (up to 41 in on the open side) or a full (up to 25 in), each with one side against a wall and 40 in past the foot. No queen or king, and no dresser or desk at 24 in paths.
How big is a small bedroom?
The bed decides. For 24 in on both sides with the door near a corner, our runs needed an 8×9 for a twin, a 9×10 for a full, a 10×10 for a queen and a 10×11 for a king.
What makes a room a bedroom?
On size, a bedroom is a habitable room under the IRC, so it needs at least 70 sq ft and at least 7 feet in any horizontal dimension. This page covers only those size rules; ask your local building department about the rest.
Sources
- 2021 International Residential Code, R304 minimum room areas (UpCodes, Colorado’s adoption): R304.1 (70 sq ft) and R304.2 (7 ft in any horizontal dimension), kitchens excepted
- Minimum Dimensions in the IRC (Fine Homebuilding): habitable space includes sleeping; the 70 sq ft and 7 ft minimums
- How to Get Your Furniture Arrangement Right (Houzz): at least 24 in for minor paths, 30 to 48 in for main routes
- Mattress sizes and dimensions (Amerisleep): twin 38 × 75 in, full 54 × 75 in, queen 60 × 80 in, king 76 × 80 in mattresses
- Desk dimensions (House Plans Helper): room to pull out a desk chair