I am carpeting a bathroom and would like to determine the finished floor height so I can get the toilet flange raised up as necessary to ensure that the fixture is stable and that it won't leak.

How do I determine what the finished floor height of a carpeted room will be? Do I simply add 1/2" if I'm planning on 1/2" padding beneath the carpet?

How does one accommodate the fact that carpet and pad will compress on installation of the bowl and additionally over time? <-- This was a very silly statement, as has been called out by many people. It wasn't really my intent to put the toilet on the carpet, but to have the carpet installed around the bowl. Despite 3 attempts to proof read prior to posting, I still managed to leave that in there.


This is a battle that has already been lost and it is not one that I'm willing to get divorced over, as that would be the only possible outcome to a non-carpeted bathroom.

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    Do think carpet under a toilet is not a good idea. If you must use(wife says so) carpet, would cut it out to fit the toilet base. Carpet and padding would give too much for a solid fit. Hopefully no one checks if the carpet goes under the toilet.
    – crip659
    Commented Jan 28, 2023 at 15:42
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    Yeah, put a solid fill cut to the toilet base shape in a toilet base shaped hole in the carpet and pad. That is your floor height for the toilet install, and will avoid the moving toilet breaking the wax seal and leaking into the carpet. Or, put the toilet directly on the floor in a toilet-base-shaped hole in the carpet and pad. Or (major work) change to a wall-hung toilet that flushes out the back and does not touch the floor.
    – Ecnerwal
    Commented Jan 28, 2023 at 15:49
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    While you can carpet a bathroom, toilets don't go on carpet.
    – Mazura
    Commented Jan 28, 2023 at 16:45
  • 2
    Happy wife, happy life. Commented Jan 28, 2023 at 20:34
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    FWIW, my parents laid carpet tiles in the bathroom when I was a kid. They survived OK. You just don't want deep-pile carpets (which won't dry quickly and will go mouldy), you can't use underlay (moisture underneath it creates a perfect breeding ground for mould), and it must be 100% artificial fibre or it'll rot. Also a mat around the toilet to catch splashes is essential (and needs regular washing).
    – Graham
    Commented Jan 29, 2023 at 11:09

2 Answers 2


The finished floor height will be the height of the floor without carpet and pad. The toilet gets installed first. Then carpet and pad trimmed around the base of the toilet. ( Haven't had a carpeted bath here in Fla. but when I was in Ohio it was nice on the feet on cold mornings....no judgement here.)

  • Thank you. This was my assumption and plan, but I'd seen a comment on another question and it got me wondering if I should raise the base of the toilet to accommodate the depth of the carpeting.
    – FreeMan
    Commented Jan 28, 2023 at 15:58

Most of the time, bathrooms are carpeted after the fittings, including the toilet, are already in. With a good fitter, you won't see any difference, and when comes the time to change the carpet, which will happen, it's far easier to take up the old, often rotten, or soggy one.

So, mount the pan straight to the floor, and fit the carpet round it. That way, it's onto something more solid, and won't tend to move about as everything settles, too. Even use underlay if you wish, why not?

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