How to Build a Mailbox Post for Two Boxes

Building a mailbox post for two boxes might seem like a daunting task, but with the right materials and a bit of planning, it's a manageable DIY project. This guide will walk you through the process, from gathering supplies to installation, ensuring your mail arrives safely and securely.

Before you start, ensure you're familiar with your local building codes and homeowner association rules. It's also crucial to choose a location that's easily accessible to postal carriers and provides adequate space for two mailboxes.

Gathering Materials and Tools

To build a mailbox post for two boxes, you'll need the following materials and tools:

• Two mailboxes that meet USPS standards
• Four-by-four pressure-treated lumber (8-foot length)
• Concrete mix (fast-setting)
• Gravel
• Post hole digger
• Tape measure
• Level
• Drill and appropriate drill bits
• Screws (2-1/2 inch galvanized)
• Carriage bolts (1/2 inch by 6 inches)
• Nuts and washers
• Paint or sealant (optional)

Choosing the Right Mailboxes

When selecting mailboxes, ensure they meet USPS standards for size, mounting, and security. Standard mailboxes are typically 6 inches wide, 12 inches high, and 16 inches deep. For two boxes, you'll need a post that's at least 18 inches wide to accommodate both.

Consider the material as well. Steel mailboxes are durable and secure, while aluminum is lighter and more affordable. Some mailboxes come with mounting hardware, but you may need to purchase it separately.

Preparing the Post Hole

Before you start digging, call your local utility companies to mark any underground lines. The post hole should be approximately 24 inches deep and 12 inches in diameter. You can use a post hole digger or rent a power auger for larger holes.

Once you've dug the hole, fill the bottom with a few inches of gravel to improve drainage. This will help prevent water from pooling around the post and causing rot.

Installing the Mailbox Post

Now that you have your materials and tools ready, it's time to install the mailbox post.

First, cut the four-by-four lumber to the desired height, plus an additional 12 inches for the post to be buried in the ground. This will provide stability and prevent the post from leaning over time.

Assembling the Post

Using the drill, create two pilot holes in the center of the four-by-four post, about 12 inches from the top. These holes should be spaced to match the mounting hardware on your mailboxes.

Next, attach the mailboxes to the post using the carriage bolts, nuts, and washers. Ensure the mailboxes are level and centered on the post. If necessary, use shims to adjust the height of the mailboxes.

Setting the Post in the Hole

With the help of a second person, carefully lower the post into the hole. Ensure it's plumb and level using the level tool. Once the post is in place, fill the hole with concrete mix, following the manufacturer's instructions.

Use a trowel to smooth the concrete and ensure it's level with the ground. Allow the concrete to set for at least 24 hours before installing the mailboxes.

Finishing Touches

After the concrete has set, you can install the mailboxes onto the post. If desired, paint or seal the post to protect it from the elements and prolong its lifespan.

Finally, backfill the hole with soil, ensuring it's firmly packed around the post for added stability.

Congratulations! You've successfully built a mailbox post for two boxes. Regularly inspect your mailboxes and post to ensure they're in good condition and ready to receive your mail. If you notice any damage or wear, make repairs promptly to maintain the security and functionality of your mailboxes.