How to Convert a Commode Into a Sink

Written by karen eisenbraun
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Toilet tank sink attachments convert your toilet into a dual-purpose sink and commode. The attachment sits atop your toilet tank and replaces your lid. When you flush, clean water runs through the faucet before draining into the toilet bowl. This water comes directly from your supply line and is perfectly clean to use for hand washing. The sink conserves water by filling the toilet with used, or grey, water. According to manufacturer Sink Positive, this can amount to gallons of reduced water consumption daily. These sinks also promote hygiene by running automatically, eliminating the need to touch dirty faucet handles.

Skill level:


  1. 1

    Turn off the water supply to your toilet.

  2. 2

    Remove the tank lid and the existing refill supply tube.

  3. 3

    Assemble the faucet according to the directions and attach the tubes. The water supply tube connects the toilet’s inlet valve to the faucet, and the sink’s drainage tube connects to the toilet’s overflow tube, which drains into the bowl.

  4. 4

    Secure the sink to the top of the toilet tank and turn your water back on. You can now begin using your new sink attachment. The water will run for as long as it normally takes for the toilet tank to refill, which is typically long enough for you to wash and rinse your hands.

Tips and warnings

  • Measure your toilet tank to make sure the sink will fit before purchasing. Toilet lid sink attachments are adjustable to fit most standard toilets that are 8 by 16-1/2 to 22-1/2 inches. On some toilets, the sink attachment may extend past the sides of the tank, which will not affect its performance.

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