How To Attach Window Boxes to Brick Siding

Window boxes make a charming addition to any home, but mounting them to masonry brick or stone siding might strike you as daunting or even frustrating. Dread not—with the right approach, and in less than an hour, you can see this deceptively simple project through from start to finish.

In this article and the video above, This Old House general contractor Tom Silva demonstrates the process of attaching window boxes to brick siding, highlighting various fastening options and their installation methods.

*Cost information in this article reflects an average of prices sourced from Home Depot, Lowes, and Amazon.

Window Box Mounting Options

Before starting the installation process, familiarize yourself with the different mounting options. Each method has advantages and disadvantages, depending on your specific needs and the condition of your brick wall.

Bracket Mounting

Bracket mounting is one of the most common and secure methods for attaching window boxes to brick siding. This technique involves installing sturdy brackets directly into the brick wall, which then supports the weight of the window box. With proper mounting, brackets can support various window box sizes and loads.

Direct Mounting

Direct mounting involves attaching the window box directly to the brick wall without using brackets. This method can create a sleek, streamlined look. However, it makes removing the window box difficult, and we do not recommend directly mounting heavier window boxes.

Non-Drilling Options

Alternative mounts are available for those who prefer not to drill into their brick walls. Drill-free options include adhesive mounts, tension rods, and specialized hooks that clamp onto pronounced surfaces. While these methods may be less invasive, they can’t support as much weight and are best for lightweight, temporary installations.

Tools and Materials Needed to Install a Window Box

To successfully attach window boxes to brick siding, you’ll need the following materials and tools.

Tools

• 1/2-inch carbide-tipped masonry drill bit
• Box-end wrench
• Hammer
• Hammer drill
• Measuring tape
• Level
• Pencil or marker
• Safety glasses
• Work gloves
• Extension ladder (only necessary for second-story and third-story installations)

Materials

• Lag screws
• Wall anchors
• Window box brackets

Preparing for Installation of Your Window Boxes

Before you start drilling into your brick wall, we recommend learning and cleaning the installation site. This preparation will help ensure accurate placement and a secure attachment.

Measure and Mark

Begin by measuring the width of your window and determining the ideal placement for your window box. Most manufacturers recommend positioning the box 3 inches below the window sill. Use a measuring tape and pencil to mark the center of the window, then measure and mark the locations for your mounting brackets on either side.

Choose the Right Fasteners

Selecting the appropriate fasteners is crucial for a secure installation. Silva demonstrates several options in the video, including plastic inserts with lag screws and specialized masonry anchors. Choose fasteners that are rated for the weight of your window box and suitable for use with brick.

Safety Considerations

Safety should be your top priority when working on a ladder and using power tools. Always wear safety glasses and work gloves, and ensure your ladder is stable and positioned on level ground.

If you’re uncomfortable working at heights, please hire a professional to install your window boxes.

Step-By-Step Installation Process

Follow these steps to attach your window boxes to brick siding securely:

1. Position your ladder securely beneath the window where you’ll install the box.
2. Use your hammer drill and masonry bit to drill holes into the brick at your marked locations. Drill slightly deeper than the length of your wall anchors.
3. Insert plastic wall anchors into the drilled holes, tapping them in gently with a hammer if necessary.
4. Align your mounting brackets with the anchors and secure them using lag screws. Tighten the screws with a box-end wrench, ensuring the brackets are level and firmly attached.
5. Once both brackets are secure, set the window box in the brackets, then check that it’s snug and level.
6. If your window box requires additional securing, follow the manufacturer’s instructions for attaching it to the brackets.
7. Test the stability of your installation by gently pushing on the window box from various angles.

Silva emphasizes the importance of using the correct drill bit size and ensuring the plastic anchors are fully inserted before tightening the lag screws. This attention to detail will result in a sturdy and long-lasting installation.

Maintenance and Care of Window Boxes After Installation

Once your window boxes are securely attached to your brick siding, proper maintenance will ensure their longevity and continued beauty.

Regular Inspections

Periodically check your window box installation for any signs of loosening or damage. Tighten any loose screws and replace any damaged components promptly to prevent accidents or water damage to your brick siding.

Seasonal Considerations

In regions with harsh winters, we recommend removing your window boxes during the off-season to protect them from freeze-thaw cycles that could damage them and your siding. If you choose to leave them in place, ensure proper drainage to prevent water accumulation and potential frost damage.

Planting and Watering

When planting in your window boxes, be mindful of the weight distribution. Overloading one side can put unnecessary stress on your mounting brackets. Additionally, use proper drainage techniques to prevent water from constantly seeping onto your brick siding, which could lead to staining or deterioration over time.

Alternative Window Box Mounting Methods

If you’d rather not damage your siding with more permanent methods, you have a few damage-free options. Let’s go over each method’s perks and cons.

Adhesive Mounts

Strong construction adhesives designed for outdoor use can be an option for lightweight window boxes. However, adhesive mounts don’t provide the same level of security as mechanical fasteners. Additionally, it’s hard to find a weatherproof masonry adhesive that won’t damage the brink when removed.

Tension Rods

Adjustable tension rods that fit between the window frame can support some window box designs without drilling. This method is best for shallow, lightweight planters.

Brick Clamps

Bar clamps and gripping hooks can also support lighter window boxes. These fixtures typically hook over the top of a brick and use tension to hold the box in place.

While these alternatives can be effective in certain situations, they offer less support than traditional bracket mounting.

When deciding on a non-drilling mounting method, think about how much your fully planted window box will weigh and what your local weather is like.

Window Box Design Tips

When choosing a window box, select a style and material that complements your home’s architectural design.

Pick high-quality, rust-proof brackets and boxes that can stand up to the weather. Confirm that your window box features rot- and mildew-resistant materials or weatherize it before installing it.

Account for the size and species of your plants, and choose a box that’s wide and deep enough to accommodate them. Factor in the light conditions and arrange your plants accordingly. For example, shade-tolerant flowers like impatiens work well in low-light areas, whereas petunias and geraniums need full sun.

An All-Season Addition

Window boxes can enhance your home’s curb appeal regardless of the season.

In the spring, showcase flowers such as tulips and daffodils and change over to petunias and marigolds in summer. Transition to autumn with ornamental cabbages, mums, and pansies, which can withstand cooler temperatures. In winter, replace the window box’s contents with a bouquet of evergreen branches, holly sprigs, and even durable ornaments.

Tools