A window box bursting with blossoms will brighten any window, from inside or out. If you buy a stock one, you'll have your choice of designs, but you’ll also be limited to standard lengths—typically 2 to 6 feet, in 6-inch increments.

Building the paneled box shown here offers you the chance to tailor your planter to the width of your window and select molding to match your home's style. PVC boards come in white but can be painted any color. Either way, they mimic the look of painted wood without being a target for rot and mold. They're available at home centers in the same dimensions as traditional lumber. If you prefer to work in wood, choose a water-resistant species, like teak or cedar.
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    Tools List

    • 16-foot tape measure
      Tape measure
    • miter saw
      Sliding compound miter saw or a circular saw
    • hand clamps
    • brad nailer
      Brad nailer
    • drill
    • spade bit
      ½-inch spade bit to make the drainage holes
    • 1/4-inch drill bit
      ¼-inch bit to drill pilot holes into a wood-frame house
    • 3/16 masonry bit
      Masonry bit to drill pilot holes into a stone or brick house
    • four-foot level
      4-foot level to make sure the brackets are level

    Shopping List

    1x10 PVC board for the box frame. Get a 12-foot length.

    1-by-1-inch PVC outside-corner molding for the vertical trim. Get an 8-foot length.

    PVC cap molding for the top and bottom. Get two 8-foot lengths.

    1½-inch brads for securing the box frame

    ¾-inch brads for securing the molding

    -by 3-inch lag screws to secure the brackets to the house

    1¼-inch deck screws to secure the window box to the brackets

    1 pair of weight-bearing window-box support brackets

    Masonry anchors for stone or brick walls

    PVC cement