Can I replace my fence posts without replacing the whole fence?
Short answer
Yes, when the rails and pickets are still sound. We brace the panels upright, free the rails from the failed post, pull or cut out the old post and footing, set a new ground-contact post in a fresh footing, and re-hang the panels with new screws. It works best one or two posts at a time so the fence never comes apart. The limit is the condition of the panels: if rails are split and pickets are soft, saving them costs more than it is worth.
When it makes sense
Posts live a harder life than panels. They sit in wet ground, carry the wind load, and get hit by sprinklers, so they often fail years before the pickets above them show much more than gray. A fence with redwood or cedar panels still tight and straight, sitting on posts that have rotted at grade, is a good candidate for post replacement alone.
The test is simple. Push the panels; if the pickets are firm, the rails are not split at the ends, and the fasteners are not bleeding rust down the boards, the panels can take being handled. If they are cupped, cracked and shedding nails, be honest with yourself about what you are saving.
How the work goes
We start by bracing the panels on either side of the failed post with diagonal 2x4s staked into the ground, so nothing falls while the post is out. Then we back out or cut the fasteners holding the rails to the post. On a nailed fence that often means a reciprocating saw run between rail and post.
The old post comes out next. If the footing is sound and the post has simply rotted off, we may be able to break out the stub and reuse the hole. More often the footing is cracked or tilted too, and the whole lump comes out. A new hole is dug to the right depth, gravel goes in the bottom, and a new ground-contact rated post is set plumb and braced before concrete is placed and crowned away from the wood.
- Brace panels on both sides before touching anything.
- Cut rails free; do not pry them, which splits the ends.
- Remove post and footing; dig a proper new hole.
- Set and plumb the new post; let the concrete cure.
- Re-hang rails with coated or stainless screws, not the old nail holes.
Reusing the hole versus moving the post
Sometimes the easiest answer is to set the new post a few inches to one side of the old footing rather than fight a stubborn lump of concrete out of the ground. That works if the rails are long enough to reach, and it can be a good moment to correct a post that was never on layout. Just make sure the new hole is not so close to the old concrete that it ends up shallow or half-sized.
Matching the new post to the old fence
A new pressure-treated post is green or brown and wet; the old fence is silver. The post will weather, but if the fence is stained we match the stain once the post has dried out for a few weeks. If the fence has decorative post caps, we reuse them or cut new ones to match. Details like that are the difference between a repair that disappears and one that announces itself from the street.
Where the line is
Replacing one post in ten is a repair. Replacing half the posts in a run means handling every panel, and at that point the pickets usually show their age the moment they are moved. We will tell you when post replacement is the right call and when it is throwing good money after a fence that has run its course.
Related questions
Can a rotted post be replaced without digging out the concrete?
Sometimes. If the footing is solid and level, the rotted stub can be broken out and a new post set in the same socket, or a steel post repair bracket can be driven into the footing to carry the old post. If the concrete is cracked or tilted it has to come out.
How long does the concrete need to cure before the panels go back on?
Fast-setting post mixes are typically firm within an hour or so, but we like to leave the post braced and unloaded until the next day before hanging rails, especially on a tall fence that will see wind.
Should I replace all the posts at once if a few have failed?
Probe them all first. If the rest are sound at grade, replace only the failed ones. If several are soft, doing the whole run in one visit saves repeat trips and gets the fence straight along its full length.