Toilet rooms must have a minimum ceiling height of 6-feet 8-inches. Where the ceiling is sloped, such as under a stairs, because the toilet fits in at the low side of the sloped ceiling under the stairs, the vertical clearance in front of it is the primary issue and there are exemptions. Here are the parameters you have to work within, based on the International Residential Code (IRC R305.1):

1) For a room with a sloped ceiling, at least half of the ceiling must be a minimum of 7-foot or higher, with no part of the required floor area lower than 5 foot.

2) There must be a minimum of 6-foot 8-inches height at the center of the front clearance area of the fixture. Minimum clearance in front of a toilet or sink is 21-inches, so the ceiling must be 6-foot 8-inches high at 10-1/2-inches away from the front of the toilet.

For the minimum ceiling heights for other areas, click: Basements  Bathrooms  Bathtubs  Bedrooms  Hallways   Garages  Kitchens  Laundry Rooms  Showers  Tiny Houses  

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Here’s links to a collection of our other blog posts about “TOILETS”: 

• Why is there sand in the bottom of my toilet tank?  

• Are drop-in toilet bowl cleaner tablets safe?

• Why is there mold inside my toilet tank?    

• What are the pros and cons of a wall-mounted toilet?

• What are the minimum clearances around a toilet? 

• What is the little tank on top of the water heater for? 

• What is that big thing in the toilet tank? 

• What is the white plastic tank inside my toilet tank?

• Can I install a commercial (wall-mounted flushometer) toilet in my home? 

• Does a home inspector check toilets?

• What is the code required minimum height above a toilet? 

    Visit our PLUMBING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.