Minimum measurement for a powder room

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Posted by: from Ottawa
10/31/2020 at 9:25:22 PM

Hi pros!

What are the minimum measurements for a powder room in Ontario? I haven't been successful in my research. We have an old 1900s row house with minimal square footage and are contemplating if we have enough space for a tiny powder room.

We're thinking of a space that measures 33x55 inches. Is this a pipe dream (pardon the pun).


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Reza from Mipa Plumbing in Aurora
Date/Time11/1/2020 at 7:51:37 AM


Not to bad 33 x 55 it works for powder room

Good luck

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Date/Time11/1/2020 at 8:29:40 AM

Hi Dana.

Nice to hear you're considering putting in a powder room.

The toilet will dictate most of the minimum dimensions, as it will need minimum 15" from centerline to a sidewall and 21" minimum clearance in front of the toilet bowl. Most toilets are 27" Long. Home Depot sells a vanity that 14"Deep. Add the 21" clearance in front of the bowl, you end up with 62"LX30W" inside measurements. You are close to your working dimensions if they are inside measurements. You can save about 6" on the length if you install a wall mounted toilet, where the tank is in the wall. It's a nice modern option. You will have to add 4 1/2" for finished 2x4 walls for your outside measurements. The door would have to be 24" and slightly off centre. A pocket door is a an option you can consider.

You will also need to consider how to get the waster water away. The drains can be a major challenge!

Hope this helps. Good luck with your renovation!


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Richard in Edmonton
Date/Time11/3/2020 at 10:22:12 PM

There is nothing in today's Building Code that regulates this subject unless it is a 'barrier free' or 'public' washroom.

I believe once upon a time there was a requirement for distance from a toilet to a side wall but was dropped from the Code some time ago.

You could build a bathroom like one on an airplane if you like. There are minimum room and space dimensions for other things like bedrooms, living rooms, kitchens, etc. (Table

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