What is the Minimum distance from the center of a toilet bowl to a wall?

A minimum of 15 inches off the finished side wall. and a minimum of 12 inches of the finished back wall. However, 18" side clearance is the international standard for wheelchair and assisted toilet seating thereby providing more manuevering room; it also feels mor comfortable for larger people. More advice from FAQ Farmers: * 12" * Check with the manufactures spec sheet the should come with the new water closet if not with the the fixture a call to the Plumbing supply place should get the exact dimension for that model as they vary between residintial houseing and mobile homes and even handicap fixtures * Toilets are available in 10", 12", or 14" rough in sizes. 12" is the most common.