How Do You Fix a Rotted Fence Post?

by the Berry team · Updated October 20, 2026

Wood fence posts usually rot right at the ground line, where wood stays wet, and a post that leans or wobbles there needs to be braced or replaced. A steel repair bracket driven next to the old post costs about $20-$40 and works when the post above ground is still solid, while replacing the post costs about $20-$50 in materials yourself or $150-$400 per post with a pro.

Fixes and what they cost

Ranges are typical US prices for a standard wood privacy or picket fence. Corner and gate posts take more work and cost more.

Fix	When it works	DIY cost	Pro cost
Steel repair bracket or mender	The post is rotted at the ground but solid above it. A steel stake is driven beside it and bolted on.	DIY$20-$40 per post	Pro$100-$250 per post
Replace the post	The post is rotted through, broken, or soft well above ground.	DIY$20-$50 for a post and concrete	Pro$150-$400 per post
Replace a gate post	A sagging gate often traces back to a leaning or rotted gate post.	DIY$40-$100	Pro$250-$600
Replace a fence section	Posts, rails, and pickets in one bay are rotted or broken.	DIY$100-$300 in materials	Pro$300-$1,000 per section
Replace the whole fence	Many posts are failing at once, often on an older fence.	DIYNot recommended for most people	ProOften several thousand dollars, depending on length and material

Ranges are typical US prices and vary with your region, your home, and the season. A pro quote for your exact job beats any range.

Why posts rot at the ground

The ground line is where wood stays damp longest and where fungi have oxygen and moisture together. Concrete can make it worse when the top of the footing is flat or below grade, because it holds water against the post instead of shedding it. That is why a post can look fine at the top and snap off at the soil.

Brace or replace?

Dig a few inches down. Clear the soil at the base and push a screwdriver into the post. If the rot is only at and just below the ground line and the wood above is hard, a repair bracket can save it.
Check the rest of the post. If the post is soft well above ground, cracked lengthwise, or broken, replace it.
Look at the neighbors. Posts installed at the same time tend to rot at about the same time. If several are wobbling, it may be time to plan for a larger repair.

How to replace a post

Call 811 before you dig, even for one post. Utility lines are often shallower than people expect.
Support the fence. Brace the panels on both sides with scrap lumber so they do not sag when the post comes out.
Detach the rails from the old post, usually by removing screws or nails, or cutting through them.
Remove the old post and footing. Dig around the concrete, then lever it out with a long bar. Sometimes it is easier to set the new post in a fresh hole right next to the old one.
Set the new post in a hole about a third as deep as the post is tall above ground, with a few inches of gravel at the bottom for drainage.
Fill with concrete, check plumb on two sides, and slope the top of the concrete so water runs away from the post.
Reattach the rails once the concrete has set, usually after a day or so.

Making new posts last longer

Use ground-contact rated posts, and seal any cut ends with an end-cut preservative.
Put gravel at the bottom of the hole so water can drain away.
Crown the top of the concrete above the soil so it sheds water instead of pooling against the wood.
Keep soil, mulch, and plants from piling up against the base of the post.
If you have a sprinkler system, aim heads away from the fence line.
Consider steel posts with wood facing, or post brackets that hold the wood above the concrete, for a longer life.

The same rot pattern applies to deck posts. See replacing rotted deck boards for what to check on a deck.

When to call a pro

Several posts are leaning or rotted, or a whole section has fallen.
The post is a gate post, a corner post, or holds a heavy gate.
The fence is on a property line and you are not sure who owns it. Talk to your neighbor first.
You hit rock, roots, or utility lines when digging.

What makes it worse if you wait

A leaning post pulls on the rails and the posts next to it, and the next windstorm can take down a whole section.
Rot in one post often means the posts beside it are close behind, and fixing them one at a time is cheaper than all at once.
A fallen fence can mean a pet getting out, a pool barrier failing, or a dispute with a neighbor.

Common questions

Can a rotted fence post be repaired without replacing it?

Often, if the rot is only at the ground line and the post above is solid. A steel repair bracket driven into the ground beside the post and bolted to it can stabilize it for about $20-$40.

How much does it cost to replace a fence post?

Doing it yourself usually costs about $20-$50 for a post and concrete. A contractor typically charges about $150-$400 per post, more for corner and gate posts.

Should fence posts be set in concrete?

Concrete is common and holds posts firmly. To slow rot, put gravel at the bottom for drainage and slope the top of the concrete away from the post so water does not pool against the wood.

How long do wood fence posts last?

It varies a lot with the wood, the treatment level, the soil, and how wet it stays. Ground-contact treated posts set with good drainage last much longer than untreated posts or posts sitting in wet soil.

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