Replacing a rotted fence post is complicated because the rails attached to it can be difficult to remove and re-attach. Here’s a quick but sturdy fix that supports a rotting post without disturbing it: Drive a 3- to 4-foot pipe into the ground adjacent to the post, leaving about a foot above grade. Attach the pipe to the post with U-straps.
For a permanent repair, use a posthole digger to excavate a 2- to 3-foot hole next to the rotted post. Install a new pressure-treated post that rises about two feet above grade. Bind new post to old with two machine bolts or lag screws, one about a foot above the other. Cut off the bottom of the rotted post just above grade level.

Professional tip
Cut the top of wooden replacement posts at a 45° angle to help them shed water.

Money-saving tip
Buy used 2-inch pipe from a salvage yard to reinforce fence posts. It’s far cheaper and it will last longer than the wooden post anyway.

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