Rotten Fence Post Replacement
Ground-level rot is the #1 cause of fence failure. A single compromised post puts stress on every connected panel and can topple 20+ feet of fence in a storm. Catch it early and the repair is straightforward. Wait too long and you're replacing sections.
Get a Free Post InspectionHow Bad Is the Rot? — Stages of Post Decay
Early Rot
Monitor- Slight discoloration at ground level
- Post feels solid but looks dark
Moderate Rot
Repair Soon- Post wobbles slightly when pushed
- Soft spot 1–2 inches below grade
- Visible cracking at base
Severe Rot
Replace Now- Post leans noticeably
- Fence panels pulling away
- Hollow sound when tapped
Our Replacement Process
Diagnose All Posts
We assess every post for rot, not just the obvious one. Catching multiple failing posts in one visit saves a return trip.
Detach Fence Panels
Panels are carefully disconnected and propped so the fence line stays intact.
Remove the Old Post & Concrete
We use a post puller or dig out the concrete footing. Leaving the old concrete causes the replacement post to sit at an angle.
Set New Pressure-Treated Post
A 4x4 or 6x6 PT post (rated for ground contact, .40 CCA minimum) is set plumb in a fresh concrete footing.
Re-Hang Fence Panels
Once the concrete has cured (24–48 hours minimum), panels are re-attached and the fence line is checked for level.
Seal the Post Top
The cut end grain on top of the post is sealed or capped — the most common place moisture enters and starts a new rot cycle.
Prevent the Next Rotten Post
After replacing a post, keep it from rotting again with two simple habits:
- Install a post cap to shed water off the end grain (the most vulnerable spot)
- Keep sprinkler heads from spraying directly at fence posts
- Stain or seal the fence above grade every 2–3 years to slow moisture absorption
- Maintain a 2-inch air gap between the post base and any mulch or soil build-up
FAQs
Can you replace a post without removing the fence panels?
Yes. We detach the fence sections from the damaged post, pull the post, set a new one, and reattach. The panels usually stay in good shape and are reused.
How do I know if a post is rotten vs. just dirty?
Press a screwdriver firmly against the post at ground level. If it sinks in easily or the wood feels spongy, the post is rotting. A dark stain alone doesn't mean it's compromised — moisture and tannins from the wood can cause discoloration without structural rot.
How long should a replacement post last?
Pressure-treated lumber rated for ground contact (UC4B, .40 CCA or better) should last 25–40 years in normal conditions. Adding a post cap and keeping the fence stained above grade extends life further.
Do you replace the concrete footing too?
Yes — always. Leaving the old footing means the new post sits in a wet, confined hole. We remove all old concrete and set the replacement in fresh mix.
Stop the Rot — Book a Free Post Inspection
We'll check every post in your fence line and give you a written assessment with replacement recommendations and pricing.
Book Free Inspection