How to Do Crown Molding on Windows


Crown molding creates architectural detail when added as a capital at the top of your window frames. Choose a molding that best complements the window and the existing woodwork in your space. Moldings between 2 and 4-inches high work best. Use moldings in scale with width of the window trim for best results, the wider the trim, the taller the molding.

Things You'll Need

  • Tape measure
  • 1-by-2 lumber
  • 2-inch pin nails
  • Pin nailer
  • Crown molding
  • Miter saw
  • Wood glue
  • Masking tape
  • Measure the width of the window frame, outside to outside. Measure the thickness of the window trim from the face of the wall, to the face of the molding. Measure down from the top edge of the window trim, if there is a flat space at least 3/4-inches high before the first bead or detail, mount the crown directly to the window frame. If not, add a piece of 1-by-2 above the window to attach your crown to.

  • Cut a piece of 1-by 2, if needed as outlined in the previous step, as wide as the window frame and nail it to the wall with 2-inch pin nails, on top of the window trim.

  • Mark the width of your window trim along the bottom edge of your crown molding. This edge is always the same, regardless of the height or angle of the crown molding. Position the crown molding on your saw, with the bottom edge up, against the fence,as it would be against the wall and the top edge against the saw table as it would be against the ceiling.

  • Set the saw to a 45-degree miter. Align the blade on the right side of the mark, to cut a left end, and vice versa. Check to see the cut is angling away from the mark you made. Make the cut on both ends.

  • Cut a piece of molding with one right and one left outside miter about 6-inches long. Position it on the saw as previously described. Cut both mitered ends, right at the corner where the angle of the miter breaks on a 90-degree angle to create the ends, or returns for your crown.

  • Apply wood glue to the mitered edges of the two ends you just cut and fit the mitered ends to the ends of the crown you cut to fit the face of your window trim. Tape these pieces in place with masking tape and allow the glue to set for several hours.

  • Fit the molding cap onto your window trim, so that the two mitered returns run back to the wall. Align the bottom edge 1/2-inch down from the top of the trim, or along the bottom of the 1-by-2 you added, if you added one. Nail through the molding with 1 1/4-inch pin nails, one every four inches to anchor the crown in place.

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  • Photo Credit moulding image by Jim Mills from
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