To plan a bathroom layout, put the fixtures on one wall where you can, order them along that wall from the one that needs the most room to the one that needs the least, then check the clearance in front of and beside each one. The door swing is the next check, storage comes after that, and ventilation gets planned at the same time as everything else rather than added at the end.
This is general design-planning information. Every figure below is common design practice, not a code requirement. Building codes govern what is permitted, codes vary by jurisdiction, and all plumbing, electrical and ventilation work — including any change to drain, vent or supply locations — is work for licensed trades and your local building authority to confirm and carry out under the required permits.
Plan a Bathroom Layout Around the Wet Wall
A wet wall is the wall that carries the plumbing for the room. Keeping the toilet, the sink and the shower or tub on the same wall, or on two walls that meet at a corner, concentrates the plumbing into the smallest possible run.
That matters beyond the plumbing itself. A compact run means fewer fixtures sitting out in the middle of the room, taking up floor area a small bathroom does not have. Spreading four fixtures across four walls is what turns a reasonable room into a tight one.
So start by asking which wall the plumbing already serves, and whether moving it is on the table at all. Relocating a toilet drain is a different scale of work from relocating a sink, and that question belongs to the licensed plumber and the building authority, not the sketch. Draw two versions — one keeping the existing plumbing, one moving it — and compare them before committing.
Where the room has a window, decide early whether it lands over the tub, behind the toilet or above the vanity. A window behind a vanity mirror is the conflict people discover last and resent most.
How to Plan a Bathroom Layout: Fixture Order Along the Wall
Fixtures have different appetites for space, and ordering them deliberately along a wall is most of a small bathroom layout.
- Shower or tub at one end. The largest footprint, and the one that benefits from a corner or alcove where three sides are already walls.
- Toilet next. It needs a defined width and clear space in front, and it is the fixture you least want in the line of sight from the door.
- Vanity at the other end. The most flexible of the three, and the one that absorbs whatever space is left.
That order also puts the vanity nearest the door, which is where you want it: hand washing is the most frequent use of a bathroom.
In a room wide enough for fixtures on two walls, keep the shower or tub on one side and the vanity opposite, with the toilet beside the shower rather than facing the vanity. Two fixtures directly facing each other across a narrow floor leaves no comfortable standing space.
Sketch fixtures at their real sizes, taken from actual product dimensions, rather than as generic rectangles. Footprints vary enough that a layout working on paper at nominal sizes can fail by 3 inches in the room.
Clearances in Front of and Beside Each Fixture
Clearance is the empty space a fixture needs to be usable. These are design-practice starting points; what is permitted in your jurisdiction is a question for a licensed professional and the local building authority.
| Fixture | Clear space commonly planned |
|---|---|
| In front of a toilet | About 21 to 30 inches of clear floor |
| Each side of a toilet centerline | About 15 to 18 inches to a wall or fixture |
| In front of a vanity or sink | About 21 to 30 inches of clear floor |
| Beside a sink centerline | About 15 to 20 inches to a side wall |
| Between two sinks, centerline to centerline | About 30 to 36 inches |
| In front of a shower entry | About 24 to 30 inches of clear floor |
| Shower interior, inside dimensions | Commonly no smaller than 36 by 36 inches |
| In front of a tub, long side | About 24 to 30 inches of clear floor |
| Main walkway through the room | About 30 to 36 inches |
In design practice, clear floor spaces can overlap in a small room: the space in front of the toilet and the space in front of the vanity can share floor, since nobody uses both at once. What you do not want them overlapping is a walkway someone else needs while a fixture is in use.
Draw the clear spaces as shaded rectangles, then look at what remains. If no unshaded floor is left to stand on, the layout needs a fixture removed or shrunk rather than rearranged again.
How to Plan a Bathroom Layout Without a Door Swing Conflict
The door is the most common failure in a small bathroom layout, and it is free to catch on paper.
Draw it as an arc at full swing and check four things. Does the open door strike the vanity, the toilet or the tub? Does it cover a towel bar, a switch position or a storage pull? Does it eat the clear floor someone needs to stand on with the door closed? And does it conflict with another door nearby?
Where the swing does not work, the usual options are:
- Reverse the swing so the door opens the other way into the same room.
- Swing it outward into the hall or bedroom, if that creates no new conflict there.
- Change to a pocket door, which needs an uninterrupted wall cavity and so becomes a question for the trades and the local authority.
- Change to a sliding door, which needs clear wall beside the opening and seals less well.
- Move the opening to a different wall, usually the best answer and the one considered last.
Check the shower door too. A hinged glass door swinging out into the clear space in front of a vanity is a daily annoyance; a sliding or fixed-panel entry removes it.
Storage That Fits the Layout
Bathroom storage planned after the fixtures are placed is always inadequate, because the leftover wall is never the useful wall. Plan it as part of the layout.
Work through what has to live in the room — daily toiletries, a hair dryer, towels in use, spare towels, cleaning supplies, paper goods — then assign each a place:
- Daily items in the vanity, in drawers rather than behind a door, at the height of the person using them.
- Towels in use within reach of both the shower and the sink, which means a bar or hook beside each.
- Spare towels and paper goods in a tall cabinet, a linen closet, or shelving above the toilet, which is otherwise dead wall.
- Shower supplies in a recessed niche rather than a hanging caddy, planned while the wall is still a drawing.
- The hair dryer near an outlet position, which is a specification question for the electrician.
Keep a clear stretch of countertop beside each sink. A vanity with no clear counter is the bathroom equivalent of a kitchen with no landing space.
Plan the Ventilation as Part of the Layout
Ventilation position is a layout decision, and it is the thing most often added as an afterthought.
Decide early, and in writing on the plan, where the exhaust point sits relative to the shower or tub, how it is controlled, and whether its control is separate from the room light so it can keep running after the light is off. Where the room has a window, most bathroom designs treat the window as a supplement rather than as the room's only means of exhaust, and the question of what applies to your project is one for the licensed trades and the building authority to answer for your jurisdiction.
Put it on the drawing rather than leaving it to a conversation. Ventilation routing interacts with joists, framing and roof or wall penetrations, all decided by other trades at a stage that passes quickly, and a note on the plan survives that stage where an intention does not.
A bathroom layout comes together in a fixed order — wet wall, fixture order, clearances, door swing, storage, ventilation — and almost every cramped bathroom skipped one of those steps rather than getting the taste wrong. Draw each step and shade the clear floor as you go, and the room works before anything is ordered. For layout worksheets and clearance checklists to plan against, see the Free Resources page.