How to Trim a Bathroom


Many people install trim in the bathroom around windows, tubs, the ceiling and the floor to cover these corners and any rough, unsightly edges where walls meet, tubs meet with the floor and walls, and where tile meets walls. These pieces of trim go by slightly fancier names, depending on their placement: baseboards trim the corners between walls and floors, while crown molding is the general name for trim that hides the corners between walls and ceilings. Trimming your bathroom adds character to this small room and takes about a day to install in an average-sized bathroom.

Things You'll Need

  • Tape measure
  • Baseboards or crown molding
  • Pencil
  • Carpenter’s square
  • Miter saw
  • Sandpaper
  • Paint or stain
  • Paintbrushes
  • Stud finder
  • Finishing nails
  • Hammer
  • Measure the places you wish to install the trim. Measure each short section of the wall, in inches, from corner to corner. For lengths of wall that extend more than 8 feet, you may have to install two pieces of trim, end-to-end, to trim the entire length.

  • Transfer those same measurements onto pieces of crown molding or baseboard, making small pencil marks across the front of the piece. Use a carpenter’s square to draw mitered cuts into the ends of each trim piece that will go into a corner. For inside corners, miter the pieces toward the back and do the opposite for outside corners, so that the mitered ends will meet at 90 degree angles.

  • Adjust the setting on the miter saw as necessary and follow your cutting lines to make the angled cuts into the ends of the trim pieces.

  • Use sandpaper all over the front, back and edges of each baseboard or crown molding piece to remove any rough spots and sharp edges. Paint or stain the baseboards to match the bathroom décor.

  • Start in one corner of the bathroom and work all the way around the room to the same corner. Set the piece cut for this corner into place with the angled end of the baseboard or crown molding facing in or out, according to the corner you start in.

  • Hold the piece in place and run a stud finder over the wall just above the trim piece. Make light pencil marks you can easily wipe away over the wall studs to mark where you can place nails through the trim pieces.

  • Move straight down from each pencil mark and drive a small-headed finishing nail through the trim pieces and into the wall and wall studs. Leave the nail head sticking out 1/4 inch and use a nail set to hammer the nails into the trim and below the surface of the trim. Continue around the room placing one piece of trim at a time.

Tips & Warnings

  • You can place wood putty into the holes over the nails to hide the nail heads.
  • You may want to use a ladder to help you install the crown molding at the top of walls.

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  • Photo Credit moulding image by Jim Mills from
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