How to Add a Second Bathroom Sink


Adding a bathroom sink to your existing vanity area can be costly and time consuming if you pay a contractor or plumber to do it. You can do this job with a few simple considerations. If you are adding the second sink on the same wall, the basins should be no more than 30 inches apart due to drainage issues and pipes.

Things You'll Need

  • Coarse tooth saw
  • Two rubber couplings
  • Pipe glue
  • Flat head screwdriver
  • New drainpipe
  • Turn off the water to the sink by turning the valve that is located under the sink counterclockwise.

  • Cut out an area from beam to beam directly underneath the existing bathroom sink using the coarse tooth saw. Cut only about 8 inches beneath the sink from beam to beam so that it is easier to patch. Now you will see the DWV system which includes the drain, waste and vent pipes.

  • Cut into the connector of the pipe that you wish to use as a drain, which should be on the far left side of your pipes. This is called a 45 connector.

  • Apply the two rubber couplings to this pipe. This will allow you to add more drainpipe to the existing drainpipe.

  • Connect the water lines and all pipes to the corresponding existing pipes to ensure a proper fit. Apply pipe glue to the inside ridge of the old pipes, and fit the couplings over snugly into place. Allow this to dry for 10 minutes before running water through.

  • Unscrew the two clamps that came with the couplings, and place over the center section of the old pipe and the new pipe. Tighten these down with a flat head screwdriver to ensure no leakage.

  • Turn the water back on and run water through the sink to check for any leaks.

  • Replace the drywall. You can use mud around the edges of the drywall that was cut out. Fit the piece back into place and plant the mud along the edges of the piece. Spread this evenly along the edges and allow to dry overnight. Sand the area with fine sandpaper, and paint to match the rest of the wall.

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