Bathroom Design Tools & Standard Sizes To Consider

bathroom-design-programs.jpg When we sat down with a couple of interior designers to get some ideas for our master bathroom layout and the design of our kitchen, we learned a few things about “standard dimensions” that are good to know when designing a new home.

Below are those which apply specifically to the bathroom.

Plus, I’ve found a number of great online tools for designing your own bathroom, and lots of other great tips & resources that could save some time and money in the long run.


Typical Bathroom Dimensions:

  • Full bathroom (w/tub & shower combo, toilet & sink): 5×8 feet
  • Small bathroom (w/corner shower, toilet & sink): 6×6 feet
  • Half bathroom (powder room w/toilet & sink): between 3×6 and 4×5 feet
  • Water closet (just toilet): at least 36in. x 66in.


Standard Sizes & Dimensions For Items Inside Bathrooms:

  • 2-1/2 feet x 5 feet is the standard bath tub size

  • 32 inches x 32 inches is the typical size of shower stalls

  • 2-foot depth is standard for actual space for clothes along a closet wall

  • 3-foot hallways are standard inside a home

  • 2-foot deep cabinets in the bathroom are standard

  • 32-inch doorways are ideal

  • 24-inch space in front of a toilet or bidet is standard

  • 30-inch space beside the full length of the tub is typical

  • 60 to 72 inches of space required for double bowl vanities

  • 30 inches is standard vanity height

  • 60 inches must separate a light switch from a water source

  • 7-1/4 inches high (or less) and 10 inches deep are standard for a tub step

  • 26 inches off the floor is the standard height for toilet paper holders

  • 14 inches wide x 16-1/2 inches long is the standard toilet bowl size (from the center of the seat hinge holes to the front edge of the outside rim)

  • 14 inches wide x 18-1/2 inches long is the standard elongated toilet bowl size (from the center of the seat hinge holes to the front edge of the outside rim)

Sources: The Furniture Machine, Keidel, Kohler


Bathroom Universal Design Dimensions For All Ages & Abilities

1. A minimum clear floor area that is 5′ square (25 square feet) for wheelchair users to make a 360-degree turn.

2. An enlarged bathroom door with a minimum 32″ width (36″ is preferred) from doorstop to the face of the door when it is open in a 90-degree position to provide access for a wheelchair.

3. Hallways leading to the bathroom widened up to 60″ with low-pile carpeting or non-slip flooring to ease the use of walkers and wheelchairs.

4. Easy-to-grasp door handles on all doors.

5. A barrier-free shower stall, 36″ x 36″ with seat or a minimum of 30″ x 60″ without a seat (but install a grab bar around the stall).

6. An easy-access bath with removable seat (standard 5′ tub) or a permanent seat unit (5′ plus a 15″ allowance for the seat. There must be 30″ of clear floor space in front of each tub when approaching from the end (head) and 48″ if the tub is approached straight-on (side).

7. A motorized tub lift to automatically lower a person into the water or, for the less disabled, a removable bathtub seat.

8. A roll-under vanity top (34″ maximum from top of counter to floor and 29″ minimum from underside of sink to floor) with insulated hot water pipes to prevent burns.

9. Low mirrors.

10. Non-skid floors.

11. Handicapped toilet or an extended seat.

12. Wall-mounted grab bars in tub/shower areas and around toilet (diameters should be 1-1/4″ to 1-1/2″). The space between the grab bar and wall should be 1-1/2″.

13. Loop or single-lever faucet handles.

14. Faucets with anti-scald temperature controls.

15. An all-direction shower head.

16. Cabinet hardware with “D” pulls.

Source: Accessible Bathrooms


Helpful Resources For Designing Bathrooms

Does It Fit?

4-Steps To Designing Your Bathroom

Bathroom Design and Remodeling


Fun Online Tools For Bathroom Layout & Design

Virtual Bathroom Planner

Kohler: Virtual Bathroom Planner

My Projects: Design Your Room

SmartDraw is a more sophisticated bathroom design program. You can download a free trial of SmartDraw here.



Lynnette Walczak

Lynnette Walczak

I like to help people find unique ways to do things in order to save time & money -- so I frequently write about "outside the box" ideas that most wouldn't think of. As a lifelong dog owner, I often share my best tips for living with and training dogs. I worked in Higher Ed several years until switching gears to pursue things I was more passionate about. I've worked at a vet, in a photo lab, and at a zoo -- to name a few. I enjoy the outdoors via bicycle, motorcycle, Jeep, or RV. You can always find me at the corner of Good News & Fun Times as publisher of The Fun Times Guide (32 fun websites).

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