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How to create a wooden mailbox with a lockable compartment

Creating a wooden mailbox with a lockable compartment involves several steps. You’ll need some basic woodworking skills, tools, and materials. Below is a detailed guide to help you craft your own wooden mailbox with a secure, lockable compartment.

Materials Needed:

  • 1” x 6” cedar boards (for the frame and sides)
  • 1” x 4” cedar boards (for the door and lockable compartment)
  • Plywood (for the back of the mailbox)
  • Wood glue
  • Wood screws
  • Sandpaper (medium and fine grit)
  • Outdoor wood finish or paint
  • Hinges for the compartment door
  • Lock and key mechanism (such as a cam lock or combination lock)
  • Drill and bits
  • Saw (circular or table saw)
  • Measuring tape
  • Level

Step-by-Step Instructions:

Step 1: Planning the Design

Before you begin, decide on the size and shape of your mailbox. A standard mailbox size is about 10-12 inches wide, 8-10 inches deep, and 18-20 inches tall, but adjust it to suit your needs. Your design should include a main compartment for incoming mail and a lockable compartment to store more valuable items like keys or small packages.

Step 2: Cutting the Wood

  1. Main Frame: Cut the cedar boards for the sides, front, and back of the mailbox. You’ll need two side pieces, one front piece, and one back piece.
  2. Top and Bottom: Cut the top and bottom pieces of the mailbox to fit the frame.
  3. Compartment Door: Cut a piece of 1” x 4” cedar to create the door of the lockable compartment. Ensure it is slightly smaller than the compartment space to allow for hinges.
  4. Back Panel: Cut the plywood to the size of the back panel. This will help provide structural integrity.

Step 3: Assembling the Frame

  1. Begin by assembling the frame of the mailbox. Attach the two side pieces to the back and bottom using wood screws. Make sure everything is square and level before tightening the screws.
  2. Once the bottom is secured, attach the front piece and the top piece to complete the structure. Use wood glue along the edges before securing with screws for extra stability.

Step 4: Creating the Lockable Compartment

  1. Marking the Area: On the front side of the mailbox, decide where you want the lockable compartment to be. Typically, the lockable compartment is placed on the lower part of the mailbox for easy access.
  2. Cutting the Opening: Use a jigsaw or circular saw to cut an opening in the front panel for the compartment. Make sure the cut is clean and square.
  3. Install the Door: Attach the compartment door using small hinges. The door should be snug but easy to open and close. Ensure that there is enough space to install the lock on the door.

Step 5: Adding the Lock

  1. Drilling for the Lock: Depending on the type of lock you’ve chosen, you will need to drill a hole in the compartment door to fit the lock’s mechanism. A cam lock works well for this type of project.
  2. Install the Lock: Insert the lock into the hole and secure it according to the manufacturer’s instructions. Make sure the lock works smoothly before proceeding.

Step 6: Sanding and Finishing

  1. Sanding: Sand all the surfaces of the mailbox to remove rough edges and ensure a smooth finish. Start with medium-grit sandpaper and finish with fine-grit paper for a smooth surface.
  2. Applying Finish: To protect the wood from the elements, apply an outdoor wood finish or paint. Choose a finish that will prevent moisture and UV damage. Allow the finish to dry according to the manufacturer’s instructions.

Step 7: Attaching the Mailbox to the Post

  1. Once the mailbox is fully assembled and finished, you can attach it to a post or mount it on a wall. If you’re attaching it to a post, make sure the post is stable and secure.
  2. For wall mounting, use heavy-duty brackets or wall anchors to ensure the mailbox stays securely in place.

Step 8: Final Touches

  • Decorative Elements: You can add some decorative touches to personalize your mailbox. Consider adding a house number or decorative trim to the edges.
  • Testing the Lock: Ensure that the lock works smoothly and securely. Test it several times to confirm it operates as expected.

Tips for Success:

  • Use weather-resistant wood like cedar or redwood to ensure the mailbox lasts outdoors.
  • If using screws, pre-drill holes to avoid splitting the wood.
  • For extra durability, consider using wood glue and screws for each joint.
  • Always wear safety goggles and ear protection when using power tools.

With these steps, you’ll have a functional and secure wooden mailbox with a lockable compartment to store important items safely. Enjoy the process, and happy woodworking!


For a complete guide and more detailed woodworking plans, check out Teds Woodworking Course here.

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