DIY Window Boxes: How to Build and Install Charming Window Boxes for Your Home’s Exterior

Window boxes are a delightful addition to any home’s exterior, adding a touch of charm and personality. They provide a platform for displaying colorful flowers, herbs, or greenery, instantly enhancing the curb appeal of your house. The best part is, that you don’t need to be a seasoned DIY expert to create and install window boxes. In this article, we’ll guide you through the step-by-step process of building and installing your window boxes, transforming your home’s facade into a blooming masterpiece.

Materials and Tools

Before you begin, gather the necessary materials and tools:


  1. Cedar, redwood, or pressure-treated pine boards (1×6 inch)
  2. Wood glue
  3. Deck screws
  4. L-brackets or brackets for mounting
  5. Plastic window box liners
  6. Potting soil
  7. Plants of your choice (flowers, herbs, or trailing vines)


  1. Measuring tape
  2. Saw (circular or miter saw)
  3. Screwdriver or drill with appropriate bits
  4. Sandpaper
  5. Paint or stain (optional)
  6. Level
  7. Pencil
  8. Safety glasses and gloves

Step 1: Measure and Cut

Measure the width of your window and determine how long you want your window boxes to be. Typical window boxes are around 24-36 inches long. Mark and cut the boards accordingly, making sure to have a front, back, and two side pieces.

Step 2: Assemble the Box

Lay out the cut pieces to form a rectangular box. Apply wood glue along the edges where they will connect, and then use deck screws to secure the pieces together. Pre-drill holes to prevent splitting, and ensure the box is square by measuring diagonally from corner to corner.

Step 3: Sand and Finish

Sand the edges and surfaces of the box to remove any rough edges or splinters. You can paint or stain the box to match your home’s exterior or leave it natural for a rustic look. Allow it to dry thoroughly if you choose to paint or stain.

Step 4: Install L-Brackets

Attach L-brackets or mounting brackets to the back of the window box. Make sure they are level and securely fastened to provide proper support.

Step 5: Install Window Box Liner

Place a plastic window box liner inside your wooden box. This liner will prevent water damage to the wood and keep the soil contained.

Step 6: Fill with Soil and Plants

Fill the window box with potting soil, leaving enough space at the top for your plants. Arrange your chosen plants in the box, ensuring they have enough room to grow. Water them thoroughly after planting.

Step 7: Install the Window Box

Position the window box under your window and secure it to the brackets you installed earlier. Make sure it is level and stable.

Maintenance Tips

  • Water your plants regularly, ensuring they receive adequate moisture.
  • Fertilize as needed to promote healthy growth.
  • Prune and deadhead plants to keep your window box looking neat.
  • Consider changing the plantings with the seasons for a fresh look.

With a little effort and creativity, you can easily build and install charming window boxes that will transform the exterior of your home. These DIY window boxes not only add curb appeal but also provide a satisfying gardening project that allows you to showcase your green thumb. Enjoy the beauty and character these window boxes bring to your home year-round.

Buying or Selling your home in Valley Village, Studio City, Sherman Oaks, Woodland Hills, Calabasas or the greater Los Angeles area? Contact The Michelle Hirsch Group’s team of top real estate agents for all your Real Estate and Investment Property needs at 818-293-8460 or visit the website at

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