How to Make a Mailbox Frame Using 4X4 Lumber

A mailbox frame can be constructed with a few simple steps, basic tools and materials.  When looking to sell your home, the mailbox and mailbox frame are the first thing potential buyers see.  Remember that the quality of the materials used will impact the quality of the finished product. 

Careful construction by using the proper materials and care will ensure that your mailbox frame can last for years.  In order to proceed, grab your tape measure, pine board, 1 ½ inch screws, drill and power saw, and start building.

1. Purchase a pressure treated 4x4 post with an approximate length of 5 feet at your local home improvement store.


2. Measure down from the top of the post, and mark the 41 inch mark.  The post office indicates the height from the ground to the mailbox be between 41-45 inches.  Your mailbox frame should be constructed with these specifications in mind.


3. Measure and mark 12-18 inches down from the first measurement taken.  This will serve as a guide for depth required to install the mailbox frame.  Any excess length should be cut off so that the mailbox meets the height specifications in step 2.


4. Cut the pine board to match the inside dimensions of the mailbox's bottom to be placed on the frame. 


5. Position the pine board so that it is centered on the top of the post.  Screw down the pine board to the top of the post.  If desired, paint or stain the mailbox frame.


6. Secure the mailbox to the pine board.


7. Using post hole diggers, dig a hole approximately 12 inches deep where the post will be installed.


8. Insert the mailbox frame into the hole with the removed dirt.