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Install a Mailbox

Boost your home’s curb appeal with a stylish new mailbox. Installation is relatively simple. All you need are a few hours and some basic tools to get a great new look for just a little bit of money.

install a mailbox

Tools & Materials

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Roadside Mailbox Replacement

Keep federal regulations in mind when placing your new mailbox. Whether you're replacing an existing mailbox or installing for the first time, make sure it will be easily accessible for your mail carrier. Things to remember during installation:

  • The regulation height is 42-inches from the bottom of the mailbox to the ground.
  • Your house number should be clearly marked on the mailbox with painted numbers or stickers no less than 1-inch high.
  • The mailbox should be on the right-hand side of the road as traveled by the mail carrier.
  • The mailbox should be located approximately 2 feet from the side of the road to ensure the carrier can get off the road enough to clear traffic.
Good to Know

Before you excavate, check for underground utilities. Call the North America One Call Referral Service at 811 for a national directory of utility companies.

Step 1

Dig your post hole. The hole should be deep enough to hold 6-inches of gravel to promote drainage and set the post at the correct height. The bottom of the mailbox must be 42-inches off of the ground.

Step 2

Pour about 6-inches of gravel into the hole.

Step 3

Prepare the concrete mix according to manufacturer's instructions.

Step 4

Set the post and fill the hole with the prepared concrete mix. Tamp the mix while filling to eliminate air pockets.  Make sure the post is plumb.

Watch our DIY Basics videos:

How Do I Set a Post in Concrete?

What Do Level and Plumb Mean?

Step 5

Slope the concrete around the base of the post to allow for water runoff. If you want to conceal the concrete, pour it within a few inches of the top of the hole and cover it with soil after the concrete has set.

Step 6

Attach the mailbox to the post. Attachment brackets designed to fit a standard 4 x 4 post are available, but check to see if they come with your mailbox before purchasing them separately.

Step 7

Check that the mailbox assembly is level. Adjust as needed.

Step 8

Label the front and side of the box with your house numbers and name, if you wish. The numbers should be at least 1-inch high.