A master bathroom usually holds two sinks, a shower, often a tub, and sometimes a toilet in its own room. Two sinks need a vanity at least 60 in wide, because the code wants 30 in between the sinks’ centers. In our plans an 8x10 fits a double vanity, a 60 × 36 in shower and the toilet; a 10x12 adds a tub beside the shower; and a 12x14 has room for a toilet room and a freestanding tub.
What goes in a master bathroom
- Two sinks. The code wants 30 in from one sink’s center to the next (IRC P2705.1); the NKBA suggests 36 in. A 60 in double vanity puts its sinks about 30 in apart, a 72 in one about 36 in.
- A shower. At least 900 sq in and 30 in across by code (IRC P2708.1); the NKBA suggests 36 × 36 in inside. Our master plans use 60 × 36 in or larger.
- A tub, if you want one. An alcove tub is about 60 × 32 in. A freestanding tub runs 60 to 66 in long and wants at least 4 in of space all around, by one maker’s guide.
- A toilet room, if there’s space. The residential code sets no size for one. The International Plumbing Code, which homes may follow instead, asks for 30 × 60 in (IPC 405.3.1), and the NKBA suggests 36 × 66 in with a pocket or outswing door.
“Master” and “primary” bathroom mean the same room: the bathroom that belongs to the main bedroom. How a master compares with a Jack and Jill bathroom is on that page.
Eight master bathroom layouts, drawn to scale
Each plan was drawn by the layout planner and passes the code’s clearances. The dashed boxes are the clear spaces in front of each fixture, and dark bars are partition walls. Open a plan to move fixtures or change the door.
- Clear in front of the shower: 84 in
- Clear in front of the vanity: 30 in
- Sink centerline to the side: 24 in
- Toilet centerline to the side: 36 in
- Clear in front of the toilet: 54 in
8x10: two sinks and a big shower
The smallest of these plans that still feels like a master bath. The shower takes the corner by the door wall, a 60 in double vanity runs down the side wall, and the toilet faces the room from the far wall with 36 in to the wall on one side. No tub.
- Good: 84 in of floor in front of the shower, 54 in in front of the toilet.
- Tight: the two sinks are 30 in apart, the code minimum. A 72 in vanity gives 36 in but needs a longer wall.
- Clear in front of the shower: 108 in
- Toilet centerline to the side: 18 in
- Clear in front of the toilet: 90 in
- Clear in front of the vanity: 57 in
- Sink centerline to the side: 36 in
8x12: a 72 in vanity and storage
Two more feet of length buy a 72 in double vanity with its sinks 36 in apart, and room for a linen cabinet by the door. The toilet sits in the corner beside the shower with 18 in on each side of its centerline. Every roomier designer number is met. More plans for this size: 8x12 bathroom layouts.
- Good: the whole vanity wall is free of the door swing.
- Tight: nothing; you could swap the linen cabinet for a tall storage tower.
- Clear in front of the shower: 84 in
- Toilet centerline to the side: 24 in
- Clear in front of the toilet: 90 in
- Clear in front of the vanity: 39 in
- Sink centerline to the side: 36 in
10x10: no tub, lots of floor
A square room without a tub leaves the middle open: 90 in of floor in front of the toilet and 84 in in front of the shower. The shower and the toilet share the far wall, and the 72 in vanity runs along the side wall. More on square rooms: 10x10 bathroom layouts.
- Good: room to add a bench or a freestanding tub later.
- Tight: the vanity’s end comes close to the clear space in front of the toilet.
- Clear in front of the shower: 108 in
- Clear in front of the vanity: 69 in
- Sink centerline to the side: 42 in
- Toilet centerline to the side: 33 in
- Clear in front of the toilet: 69 in
10x12: a tub and a separate shower
A 60 × 32 in tub and a 60 × 36 in shower fill the 10 ft far wall end to end, and they share its plumbing. The 72 in vanity takes one side wall and the toilet the other, 33 in from the shower. Every roomier designer number is met. More ways to fit both: bathroom layouts with a tub and shower.
- Good: one wet wall for the tub and the shower.
- Tight: the tub and the shower take all 120 in of the wall; measure it before you buy either.
- Clear in front of the shower: 87 in
- Clear in front of the vanity: 55 in
- Sink centerline to the side: 42 in
- Toilet centerline to the side: 59 in
- Clear in front of the toilet: 74½ in
12x12: a freestanding tub as the centerpiece
A 66 × 31½ in freestanding tub stands 8 in out from the far wall, the spot for a window if the room has one. The shower takes the right wall, starting below the tub so its opening stays clear, and the double vanity faces it from the left. More plans: 12x12 bathroom layouts.
- Good: every fixture has more than the roomier designer numbers.
- Tight: a freestanding tub drains through the floor; its drain and supply lines are a job for a licensed plumber.
- Toilet centerline to the side: 20 in
- Clear in front of the toilet: 36 in
- Clear in front of the shower: 132 in
- Clear in front of the vanity: 78½ in
- Sink centerline to the side: 42 in
12x14: a toilet room of its own
Two short walls close off one corner as a toilet room 40 in wide and 66 in deep inside, at least the NKBA’s 36 × 66 in. The toilet has 20 in on each side and 36 in in front, and a 30 in opening is left for a pocket door. The shower takes the other corner and the freestanding tub the wall below the toilet room.
- Good: the toilet is out of sight of the door and the vanity.
- Tight: plan a light and an exhaust fan inside the toilet room; a pocket door keeps its swing out of the way.
- Clear in front of the shower: 108 in
- Toilet centerline to the side: 15 in
- Clear in front of the toilet: 24 in
- Clear in front of the vanity: 78 in
- Sink centerline to the side: 66 in
- Clear in front of the vanity: 78 in
- Sink centerline to the side: 60 in
His and hers: split vanities
Instead of one double vanity, two 48 in vanities face each other across 78 in of floor, so two people never share a counter. The shower sits between them on the far wall, the toilet in the 30 in space beside it (15 in each side of its centerline, the code minimum), and a linen cabinet in the other corner.
- Good: each vanity gets its own mirror and outlet.
- Tight: two vanities mean two sink drains on opposite walls.
- Clear in front of the shower: 102 in
- Toilet centerline to the side: 18 in
- Clear in front of the toilet: 30 in
- Clear in front of the vanity: 99 in
- Sink centerline to the side: 30 in
No tub: a two-person shower
Skip the tub and the shower can grow to 72 × 42 in, room for two shower heads. The toilet sits beside it, 18 in from the shower glass to its centerline, and the double vanity takes the long side wall.
- Good: 102 in of open floor in front of the shower.
- Tight: two shower heads need their own valves or a diverter; plan the shower wall with a licensed plumber.
Master bathroom sizes at a glance
| Room | Area | What fits in our plans |
|---|---|---|
| 8 × 10 ft | 80 sq ft | 60 in double vanity, 60 × 36 in shower, toilet |
| 8 × 12 ft | 96 sq ft | 72 in double vanity, 60 × 36 in shower, toilet, linen cabinet |
| 10 × 10 ft | 100 sq ft | 72 in double vanity, 60 × 36 in shower, toilet |
| 10 × 12 ft | 120 sq ft | 72 in double vanity, a tub and a separate shower, toilet |
| 12 × 12 ft | 144 sq ft | Freestanding tub, 60 × 36 in shower, 72 in double vanity, toilet |
| 12 × 14 ft | 168 sq ft | Toilet room, freestanding tub, 60 × 36 in shower, 72 in double vanity |
Each row is a plan above, checked by the layout planner. Vanity sizes in detail: bathroom vanity sizes.
Questions people ask
How big is a master bathroom?
Our plans run from 8 × 10 ft (80 sq ft), enough for two sinks, a shower and the toilet, to 12 × 14 ft (168 sq ft) with a toilet room and a freestanding tub. A tub plus a separate shower starts at about 10 × 12 ft in these plans.
How far apart should two sinks be?
At least 30 in from center to center by code (IRC P2705.1); the NKBA suggests 36 in. A 60 in double vanity gives about 30 in, and a 72 in one about 36 in.
How big should a toilet room be?
The residential code sets no size. The International Plumbing Code asks for 30 × 60 in (30 × 56 in with a wall-hung toilet), and the NKBA suggests 36 × 66 in with a door that swings out or slides. The toilet room in our 12x14 plan is 40 × 66 in inside.
Can a master bathroom have no tub?
Yes. Nothing in the code asks for a tub, and plans without one, like our 8x10, 10x10 and two-person shower layouts, give the space to the shower and the vanity.
Is a master bathroom the same as a primary bathroom?
Yes. Both names mean the bathroom that belongs to the main bedroom.
Sources
- 2021 International Residential Code, chapter 3 (R307.1 fixture clearances, R305.1 ceiling height) and chapter 27 (P2705.1 fixture spacing, P2708.1 showers), read in Colorado’s adoption without amendments on UpCodes
- 2021 International Plumbing Code, section 405.3.1: a water closet compartment at least 30 × 60 in (30 × 56 in for a wall-hung toilet); homes may follow either this code or the IRC (IPC 101.2)
- Larimer County, Colorado: Figure R307.1 bathroom clearances
- NKBA’s free bath planning guidelines: the roomier spacing (18 in beside a toilet, 20 in beside a sink, 36 in between two sinks, 30 in in front of each fixture, a 36 × 36 in shower, a 32 in door opening, a 36 × 66 in toilet compartment). Its newer, paid editions change some numbers.
- Kohler Underscore alcove tubs, 60 × 30 in and 60 × 32 in spec sheets
- Freestanding tubs: Kohler Ceric (59-11/16 × 28⅞ in) and Abrazo (66 × 31½ in) spec sheets; at least 4 in to the wall on every side from Signature Hardware’s freestanding tub buying guide
- Toilet depths from the wall: Kohler Cimarron round and elongated spec sheets
Checked October 19, 2026. All plans were drawn and checked with the BathDraft layout planner; centimeters are converted from inches.