How to Make a 4x4 Mailbox Post

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If you do not want to buy a mailbox post kit, you can make your own using square or round 4-inch by 4-inch lumber. To ensure that your mailbox post will last for years, use weather-resistant lumber and apply a waterproof sealer to the wood.

Things You'll Need

  • Tape measure
  • Power saw
  • One 1-inch by 4-inch pine board
  • Drill
  • Three 1 1/2-inch screws
  • Obtain a weather-resistant or pressure-treated 4-inch by 4-inch timber from your local lumber company, measuring about 5 feet long.

  • Measure down vertically from the top of the 4-inch by 4-inch post and mark the post at 41 inches, minimum. This is the minimum height allowed from the ground up to the bottom of the mailbox. The vertical height from the bottom of the box to the ground's surface may be between 41 to 45 inches, according to the US Postal Service.

  • Find the first measurement, and from that mark, measure down vertically another 12 to 15 inches. Use this measurement as a guide for the depth of the hole you need to dig to place the post. Mark the post should you need to cut off excess length.

  • Cut off any excess length of the post. The post should accommodate the measurements you chose to meet USPS vertical-height specifications.

  • Measure the inside dimensions of the bottom of the mailbox and cut the pine board accordingly.

  • Center the top of the post under the pine board. Attach the board to the post's top with screws.

Tips & Warnings

  • Place the mailbox over the secured pine board. Attach the box to the board with nails or screws, using the prefabricated holes on the lower edges of the mailbox.
  • If you buy a jumbo mailbox, you should buy or find a pine board to fit the extra dimensions of the box you purchase.

References

  • Photo Credit Walter Hodges/Photodisc/Getty Images
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