Step 1: Build a Plywood Frame

The sides' height should match the molding width, and their length should be slightly longer than the plastic planter that'll nest inside. Glue and nail the sides together.
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    Tools List

    • circular saw
      Circular saw
    • hammer with nailset
      Hammer and nailset
    • bar clamps
    • impact driver
      Drill driver fitted with a ½-inch paddle bit
    • miter saw
      Miter saw
    • latex gloves
    • dust mask
    • eye goggles

    Shopping List

    1. 6- or 8-inch salvaged baseboard or casing

    2. Plastic planter
    The planter can be shallower than the window box but should match it in length.

    3. Water-resistant wood glue

    4. ½-inch exterior plywood
    Get a 2-by-2-foot piece.

    5. 6d finish nails

    6. Clear spar urethane