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Thread: Limited Space

  1. #1
    DIY Junior Member LV76's Avatar
    Join Date
    Dec 2011

    Default Limited Space

    I have a garage / workshop that has a small bathroom where I need to replace the existing 20year old toilet, but am limited in space between the front of the bowl and the wall. The existing toilet is a round bowl with dimensions from the flange bolts to the front of the bowl are 12.5" and the toilet is a 12" rough in but a 14" rough in can be installed, the max. I can fit is 14" from flange bolts to front of bowl. I would like a Toto because of the flush ratings seem to be the best, but not all spec sheets on the toto site note the measurements between the flange bolts and the front of the bowl. Any recomendations?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    The proper way to measure a rough-in is from the center of the flange to the wall behind the toilet. The standard is 12". to accommodate things a little better, some toilets are also made in 10 and 14" rough-ins. The rough-in has nothing to do with the length of the toilet, only the distance behind the flange to the wall.

    So, even if the spec sheet doesn't show the distance to the front from the mounting bolts, it's fairly easy. Take the overall length of the toilet, subtract the rough-in and add back in the space behind the toilet. If your rough-in isn't exactly 10, 12, or 14", then you'd have to adjust for that as well.

    Really, it just easier to measure your rough-in, and then compare the total length plus the designed in space behind to the wall.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona


    In the '"old days" a 14" toilet was the same dimension as a 12", but the opening was moved forward 2". Now, most companies use a 12" bowl and attach a tank which is 2" deeper, so a 14" toilet WILL project 2" further into the room than a 12", unless you can find a "true" 14" toilet which is 25" front to back.
    Licensed residential and commercial plumber

  4. #4
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    Toto makes the Unifit adapters for several of their toilet models that allow the same toilet to fit a 10", 12", or 14" rough-in just by using the appropriate adapter. The result is the toilet fits perfectly on any of the rough-ins. You can find these in the Shopping for Toto section linked from the "Toilet Review" at the top of this page. Toto is the only manufacture that makes such and adapter.

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