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. Here are the parameters you have to work within, based on the Residential Edition of the Florida Building Code (FBC R305) and the International Residential Code (IRC):

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

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’-8” high at 10-1/2” away from the front of the toilet.

3) The ceiling height directly above the toilet must be sufficient for it “to be used for its intended purpose.” 

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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.