How to Install a Window Box

Add curb in three easy steps.

finished window flower box

Cameron Sadeghpour

Project Overview
  • Total Time: 2 hours
  • Skill Level: Beginner

Window boxes add charm to any exterior window. Not only do they give windows a nice finish, they also bring gorgeous flowers up and into view from inside the home. Once they're installed, each year is a new planting possibility. Learn how to install a window box on your home's exterior for quick curb appeal.

What You'll Need

Equipment / Tools

  • Marker
  • Measuring tape
  • Saw
  • Stud finder
  • Power screwdriver
  • Handheld screwdriver


  • 1 Pressure-treated 1x8-foot board cut to desired length
  • Painters tape
  • 2 Brackets
  • 2 Corbels, optional
  • Hex screws
  • Planter box
  • Potting mix and plants, as desired


  1. measuring wood panel

    Cameron Sadeghpour

    Attach Board to Studs

    To install a wooden window box with brackets, first cut a pressure-treated 1x8-foot board to the length of the window box minus two inches. Attach the wood board to studs. The bottom of the window box will be half an inch below the bottom edge of the board—decide on the height of the board based on where you want the bottom of the window box to sit.

    Editor's Tip: For the best visual effect, your window box should be at least as wide as the window, but should not extend more than three inches beyond the trim on each side.

  2. attaching flower box bracket

    Cameron Sadeghpour

    Attach Brackets and Corbels

    Attach brackets six inches in from each end of the wood board to hold the box. For architectural flair, add decorative corbels (painted or stained the same color as the window box) to the bottom of the brackets.

  3. close up of a window flower box

    Cameron Sadeghpour

    Secure Window Box

    Set the box into the brackets, making sure it is seated properly before planting into it. Fill the window box with high-quality potting mix; add plants. For a dynamic window box look, go for a mix of tall and trailing plants for a variety of heights and textures.

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