How to Replace a Broken or Rotted Fence Post

Fence posts fail quietly. You notice it only when the pickets lean, or the whole section sags under its own weight. A rotted or broken post isn't just an eyesore—it's a structural failure that spreads to neighboring posts if left alone. The good news: replacing one post is a weekend job that doesn't require a contractor. The work is straightforward demolition followed by proper installation. What separates a good repair from a sloppy one is patience during removal and precision during setting. A crooked post will torque your entire fence line and look wrong for years.

1. Spot the Damage First. Stand back and look at the post in full daylight. Check for soft spots by pressing a screwdriver into the wood—rotted wood will puncture easily. Mark the post with chalk if you're replacing it, and note where it connects to rails and pickets. If the post is cracked but still standing firm and the damage is only cosmetic, consider reinforcement instead of replacement.
2. Free the Fence Frame. If your fence has rails bolted to the post, unbolt them first. If pickets are nailed, pry them carefully away or cut them free with a reciprocating saw. For picket fences, you may need to remove 5–10 pickets on each side to access the post cleanly. Leave the rails in place if they're bolted—you'll support them during post removal.
3. Slice Into Pieces. Using a reciprocating saw or handsaw, cut the post into 2–3 foot sections starting from the top. This makes removal far easier than trying to yank out a 6-foot post still anchored in concrete. Cut all the way through, working down toward the ground line. Leave the bottom 12 inches in place for now—that section anchors the concrete footing.
4. Bust Out the Base. Dig around the base of the remaining post stub, exposing the concrete footing on all sides. You need to see how deep it goes. For most residential posts, footings are 18–24 inches deep. Use a digging bar or small pry bar to break the concrete into chunks. Work underneath if possible and pry upward. If the concrete is stubborn, rent a jackhammer for an hour—the rental cost is worth your back. Once loose, remove all concrete chunks and debris.
5. Clear and Level the Hole. Remove any remaining wood, concrete dust, and debris from the hole. The hole should be slightly wider than your new post. Check that the bottom is relatively level—this is where your concrete will rest. If the hole is wider than necessary (more than 2 inches beyond the post width), compact the sides with a tamper so the concrete has a clean perimeter. You want the hole deep enough that the new post will sit at the same height as the original.
6. Lock In Perfectly Plumb. Place your new post in the hole, ensuring it sits at the correct depth and height. For most fences, 8–10 inches of concrete should cover the base. Use a level against two adjacent sides to verify the post is plumb. Brace it temporarily with 2×4 supports nailed to the post and staked to the ground, or have a helper hold it steady. Mix concrete per the bag instructions and pour it into the hole around the post base. Work it gently to remove air pockets. The concrete should be level with the surrounding ground or slightly above to shed water.
7. Rebuild the Fence Frame. Wait for the concrete to cure fully—usually 24 hours, though fast-set products can support light loads in 2–3 hours. Once cured, reconnect the rails by re-bolting or re-nailing them to the new post. Align them to match the existing fence line. Then reattach pickets, working from the ground upward. Use the same fasteners and spacing as the original fence. Step back frequently to check the alignment.
8. Seal and Match the Finish. Inspect all fasteners to confirm they're tight. Check that the new post is plumb and the fence section is level along its length. If the new post is treated lumber and the old fence is weathered, consider staining or sealing the new wood to match—raw lumber looks obviously new and will stand out. Once the stain dries, your repair is complete.