- 1). Check with your post office to get information about regulations relating to things such as mailbox height and distance from the road. Dial 811 to speak with your utility company about underground utility lines prior to digging.
- 2). Remove any existing mailbox and support post by wiggling it loose or digging it free with a spade. Dig a new hole deep enough to set your mailbox at regulation height, and about twice the width of your mailbox post, using a spade or post hole digger.
- 3). Pour crushed stone into the hole to a depth of 4 to 6 inches. Wet the stones and edges of the hole using a garden house.
- 4). Insert a new mailbox post into the hole. Measure the post to ensure proper depth. If the post is too high or low, add or remove gravel as necessary to achieve the desired height. Use a level to make certain the post is plumb. Have a helper hold the post straight or brace it up as needed.
- 5). Mix cement in a bucket following the manufacturer's directions. Pour the prepared cement into the hole up to about 2 inches from the top of the hole. Stir the concrete gently with a stick to release any air pockets.
- 6). Check again to make sure that the post is straight vertically using a level. Secure scrap lumber to the post using a C-clamp to forum a brace to hold the post upright as the cement dries.
- 7). Allow cement to dry, following the cement manufacturer's recommendations. When the cement is thoroughly dry, fill the remaining hole with dirt.
- 8). Attach a mailbox to the post using the included hardware and following the manufacturer's instructions. Apply house numbers to the mailbox.