Yes, it is absolutely legal to install your own mailbox, as long as it meets the standards set by the United States Postal Service (USPS). Whether you’re replacing a damaged mailbox, upgrading your curb appeal, or setting up a new installation at your home, it’s important to follow the proper guidelines to ensure your mailbox is both safe and approved for mail delivery.
In this article, we’ll walk you through everything you need to know about legally putting up your own mailbox, from placement rules to construction standards.
USPS Mailbox Size & Construction Standards
If you’re buying a mailbox, make sure it has the Postmaster General’s (PMG) seal of approval, which means it meets USPS standards for size and construction.
Building your own mailbox or buying a custom-made one? You’ll need to ensure it still meets USPS standards. To be safe:
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Show your mailbox plans to your local postmaster for approval.
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You can also write to USPS Engineering to request drawings and exact measurements for building your own compliant mailbox.
Looking for a larger box that holds packages? USPS recommends “Next Generation Mailboxes,” which are designed to accommodate today’s parcel-heavy deliveries.
Where to Place Your Mailbox
Proper placement is just as important as proper construction. Here are the USPS guidelines for curbside mailbox placement:
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Height: 41″ to 45″ from the road surface to the bottom of the mailbox or point of mail entry
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Distance from curb: 6″ to 8″ back from the curb or edge of the pavement
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Address numbers: Display your house or apartment number clearly on the mailbox
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Street-facing boxes: If your mailbox is located on a different street than your residence, be sure to include your full street address
Tip: If your property doesn’t have a raised curb, consult your local postmaster for specific placement instructions.
What Kind of Mailbox Post Is Allowed?
When installing your mailbox, safety matters—especially if your mailbox is near the road. The Federal Highway Administration recommends using stable, breakaway posts that reduce damage or injury if struck by a vehicle.
Approved support materials include:
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A 4″ x 4″ wooden post
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A 2″ diameter standard steel or aluminum pipe
Avoid dangerous, unyielding supports like:
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Concrete-filled metal pipes
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Brick or stone posts
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Farm equipment (like milk cans with concrete)
Important: Bury the post no deeper than 24 inches into the ground.
Mailbox Maintenance Matters
Legal installation is only the beginning—regular maintenance ensures your mailbox remains functional, visible, and safe for mail delivery.
Your annual mailbox checkup should include:
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Tightening loose door hinges
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Replacing rusty or damaged parts
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Refreshing or replacing faded house numbers
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Clearing snow, brush, or debris from around the mailbox
Bottom Line: You Can Install Your Own Mailbox, But Follow the Rules
Installing your own mailbox is perfectly legal, but only if it follows USPS guidelines. From the post material to the height, placement, and box size, these standards are in place to protect your mail, your property, and your mail carrier.
If you’re unsure about compliance, it’s always a good idea to check with your local postmaster before installing or replacing a mailbox. Contact us today if you need professional help!
