Small Bathroom Layout Plans: 5×5, 5×8 and 5×10 Floor Plans
A good small bathroom layout starts with three numbers: the room’s dimensions, the clearances the code requires around each fixture, and the location of your existing plumbing. Get those right and even a 5×5 room can hold a toilet, a sink and a shower without feeling cramped.
This guide walks through minimum dimensions, the clearances used by US codes, and the most common small bathroom floor plans, from a square 5×5 to the classic 5×8 hall bath and a roomier 5×10.
Small bathroom dimensions: what counts as small?
There is no official definition of a small bathroom, but in American homes the term usually refers to rooms of about 40 square feet or less for a full bath. Typical small bathroom sizes include:
- Half bath (toilet and sink): can function in about 18 square feet, such as 3×6 feet; 4×5 feet is more comfortable.
- Three-quarter bath (toilet, sink, shower): often 5×5 to 6×6 feet.
- Full bath (toilet, sink, tub): 5×8 feet is the standard compact size, because a 60-inch tub fits exactly across the 5-foot width.
- Larger small bath: 5×10 feet opens the door to a separate shower, a double vanity or more storage.
Code clearances every small bathroom floor plan must respect
Most US jurisdictions base their residential rules on the International Residential Code (IRC), sometimes with local amendments. The National Kitchen and Bath Association (NKBA) publishes recommended, more generous dimensions for comfort. Here is how the two compare:
| Element | IRC minimum | NKBA recommendation |
|---|---|---|
| Toilet centerline to side wall or fixture | 15 inches | 18 inches |
| Clear space in front of toilet | 21 inches | 30 inches |
| Clear space in front of sink | 21 inches | 30 inches |
| Shower interior size | 30 x 30 inches, 900 sq in minimum | 36 x 36 inches |
| Clearance in front of shower opening | 24 inches | 30 inches |
In practice, the 15-inch rule means a toilet needs at least 30 inches of total width between walls or fixtures. A shower or tub with a showerhead also needs a ceiling height of at least 6 feet 8 inches over a 30 by 30 inch area at the showerhead. Always confirm with your local building department before you finalize a plan.
Small bathroom layout plans by size
The following layouts are common starting points. Each assumes a door on one of the short walls unless noted.
5×5 bathroom: shower, toilet and sink
A 5×5 room (25 square feet) is a typical three-quarter bath. The usual plan puts a 30×30 or 36×36 corner shower in one corner, the toilet next to it on the same wall, and a compact sink on the adjacent wall near the door. A corner shower with a neo-angle or sliding door avoids a swinging door blocking the room.
- Use a narrow vanity, 18 to 24 inches wide, or a pedestal sink.
- Consider an outswing or pocket door; an inswing door can collide with the sink.
- A round-front toilet saves a little depth where front clearance is tight.
5×8 bathroom: the classic single-wall layout
The 5×8 floor plan is the most common full bathroom layout in the US. A 60-inch alcove tub runs across the far 5-foot wall, and the toilet and vanity line up along one of the 8-foot walls. All the plumbing sits on one or two walls, which keeps construction simple.
- Vanity widths of 24 to 36 inches usually fit alongside the toilet.
- Replace the tub with a 60-inch walk-in shower if nobody uses the tub; the footprint is the same.
- Put a recessed medicine cabinet above the vanity and shelves above the toilet for storage.
5×8 bathroom: toilet facing the vanity
Some 5×8 rooms place the vanity on one long wall and the toilet on the opposite wall. It can work, but check the distance: a standard toilet projects roughly 27 to 30 inches from the wall, and a vanity is about 21 inches deep, so a 5-foot room leaves little clear floor between them. This layout is better suited to rooms at least 6 feet wide.
5×10 bathroom: separate zones
Two extra feet change a lot. In a 5×10 room, you can fit a 60-inch tub or shower on the end wall and still line up a 48-inch vanity and the toilet on the long wall. Another option is to place a walk-in shower and the toilet at one end and a vanity near the door, which gives the room a clear wet zone and dry zone.
- A 48-inch vanity can hold two small sinks, though a single sink with more counter is often more practical.
- A tall linen cabinet fits in the leftover wall space.
- A pocket door frees the space an inswing door would otherwise need.
Half bath layouts
For a powder room, the simplest plan puts the toilet and sink on the same wall, sharing the plumbing. In a narrow 3×6 room, the toilet sits on the far wall facing the door and a wall-mounted sink goes on the side. Either way, keep the 15-inch side clearance for the toilet.
Quick comparison of small bathroom layouts
| Size | Area | Fixtures that fit | Best for |
|---|---|---|---|
| 3×6 | 18 sq ft | Toilet, small sink | Powder room under stairs or off a hallway |
| 5×5 | 25 sq ft | Toilet, small sink, corner shower | Three-quarter bath, basement bath |
| 5×8 | 40 sq ft | Toilet, vanity, 60-inch tub or shower | Hall bath, kids’ bath |
| 5×10 | 50 sq ft | Toilet, wider vanity, tub or shower, tall storage | Small primary bath, family bath |
Bathroom layout ideas that save space
- Keep the wet wall: lining fixtures up on one plumbing wall reduces cost and leaves the opposite wall free for storage.
- Change the door: a pocket door or an outswing door can reclaim the floor area of a door swing.
- Go curbless: a curbless shower lets the floor continue, which makes the room feel larger. It needs a sloped floor and careful waterproofing.
- Use a fixed glass panel: it avoids the clearance a hinged shower door needs.
- Recess storage: niches and medicine cabinets set between studs add storage without taking floor space.
- Float the vanity: a wall-mounted vanity shows more floor and makes cleaning easier.
The layout is only the first step in designing a small bathroom that feels open: color, lighting, storage and tile choices finish the job.
How to draw your small bathroom blueprint
- Measure each wall at floor level and note where the door, window and any radiator or vent sit.
- Locate the toilet drain (standard rough-in is 12 inches from the finished wall to the drain center, though 10- and 14-inch rough-ins exist) and the sink and tub supply lines.
- Draw the room to scale on graph paper or with a free online planner, one square per 6 inches.
- Place fixtures using real product dimensions, not averages.
- Draw the clearance zones from the table above and the door swing. If any overlap, adjust.
- Show the plan to a plumber or contractor before ordering anything.
Small bathroom layout FAQ
What is the smallest bathroom size with a shower?
A three-quarter bath with a 30×30 shower, a toilet and a small sink can fit in roughly 5×5 feet (25 square feet) if clearances are respected. A 36×36 shower is more comfortable and needs a bit more room.
How much space do you need for a toilet?
Under the IRC, at least 30 inches of width (15 inches each side of the centerline) and 21 inches of clear space in front. The NKBA recommends 36 inches of width and 30 inches in front.
Can a 5×8 bathroom have a walk-in shower?
Yes. A 60×30 shower pan fits in the same footprint as a standard alcove tub, so a tub-to-shower conversion is common in 5×8 bathrooms.
Where should the vanity go in a small bathroom?
Usually on the same wall as the toilet, near the door, so it gets good light and does not block the path to the shower or tub.