Step 1: Mark the mounting location

Tom Silva marking the mounting location of a window box
Photo: Mary Beth Montgomery
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If your home has double-hung or sliding windows, measure down 1 inch from the underside of the windowsill directly below one side of the window frame and make a pencil mark to locate the top of the bracket.

For an out-swinging window, measure down 6 to 8 inches.

Tip: Have the window box and brackets handy, already painted or stained.
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    Tools List

    • drill
      Cordless drill with Phillips tip
    • four-foot level
      4-foot level
    • two-foot level
      2-foot level
    • 16-foot tape measure
      Tape measure
    • Countersink bit
      Combination countersink/counterbore bit

    Shopping List

    1. WINDOW BOX

    2. TWO WINDOW BOX BRACKETS

    window boxes longer than 48 inches need a third, center bracket



    3. 2 1/2-INCH DECKING SCREWS

    4. 3-INCH DECKING SCREWS

    5. CONTAINER SOIL

    6. PAINT OR STAIN

    7. FLOWERS AND PLANTS