Toilet lengths vary slightly, with a round front profile measuring approximately 27", to an elongated design that is approximately 29". Elongated bowls are more supportive of your legs, and their larger oval design is more comfortable. Toilets won't sit flush against the wall; there will generally be an inch or so of space behind the tank. If you're planning a new bathroom, allow at least 30" width for your body. For a more spacious feel, allow up to 36".
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