Repair when the damage is localized — a few cracked pickets, one leaning post, a sagging gate. Replace once roughly 30–40% of the structure is failing, or the posts are rotting at the base. Posts are the skeleton of a fence; once they go, patching the parts above them is throwing money at a frame that's already lost. Below is a symptom-by-symptom breakdown so you can decide before you call anyone.
The repair-vs-replace decision table
Match what you're seeing to the most common symptoms. A single row in the "repair" column is usually a quick fix; several rows in the "replace" column at once is the signal to start fresh.
| What you're seeing | Repair or replace? | Why |
|---|---|---|
| A few cracked or split pickets | Repair | Pickets are cheap and swap out individually; the structure is fine |
| One leaning post, rest is solid | Repair | Re-set or sister the single post; common after a storm |
| Sagging or dragging gate | Repair | Re-hang, add a tension cable or anti-sag kit |
| One rotted rail in a sound section | Repair | Replace the rail; neighboring panels are unaffected |
| Posts soft or rotted at ground level | Replace | The skeleton is gone — anything you fix above will lean again |
| Lean across multiple panels | Replace | Widespread post failure, not a one-off |
| Rails pulling loose along several runs | Replace | Fasteners and wood are fatigued fence-wide |
| You patch the same fence every year | Replace | Cumulative repair cost has already overtaken a new fence |
The 30–40% rule
Here's the shortcut the trades use: walk the full length of the fence and estimate what share of it is actually failing — not just weathered, but structurally compromised (rotted posts, broken rails, panels that won't stay vertical). If it's under about 30%, targeted repairs almost always win. Once you cross 30–40%, the repair adds up to most of the cost of new construction, and you're left with a patchwork fence that's still aging everywhere you didn't touch.
The rule exists because fence components age together. The pickets you didn't replace are the same age as the ones that just failed. Spend $2,000 patching a 20-year-old fence and you've bought a year or two — not a fence.
The base-of-post test settles most arguments. Push hard on each post at ground level and probe the wood with a screwdriver. If the tip sinks into soft, punky wood at the base, that post is done — and if several posts fail this test, the fence is past saving regardless of how good the pickets look from the street.
Signs a fence is genuinely past saving
Cosmetic aging is not a reason to replace. A cedar fence that's weathered to silver-grey can be structurally perfect. The signs that actually matter:
- Post rot at the base. The single biggest one. In the wet Pacific Northwest, posts set without proper drainage or concrete rot at the soil line first. A fence is only as upright as its posts.
- Widespread lean. One leaning post is a repair. A whole run tilting the same direction means the posts have lost their grip on the ground across the board.
- Failing rails. When the horizontal rails that carry the pickets are cracked, sagging, or pulling out of multiple posts, the pickets have nothing solid to hang on.
- Chronic patching. If you're fixing something every spring, the math has already flipped. Add up three years of repairs and compare it to a new fence.
- Past its lifespan. Cedar runs 15–25 years and pressure-treated 10–20. Once you're past that window and seeing the symptoms above, repair is a stopgap.
The cost math: repair vs replace
This is where the decision gets concrete. Individual repairs are cheap; a full replacement is not — but a string of repairs on an old fence can quietly add up to more than a new one.
| Job | Typical cost | Notes |
|---|---|---|
| Replace a few pickets | $5–15 / picket | Cheapest fix; DIY-friendly |
| Re-set or sister one post | $150–400 | Includes concrete and labor |
| Replace a rotted rail | $75–200 / rail | More if the section comes apart |
| Fix a sagging gate | $100–350 | Re-hang, hardware, anti-sag kit |
| Full cedar replacement | $25–45 / linear foot | See our Portland fence cost guide |
Run the comparison on your own fence. A 100-foot cedar run replaced is roughly $2,500–4,500 (full ranges in the fence cost guide). If your repair list is one leaning post and six pickets — call it $250 — repair, obviously. If it's four rotted posts, three failing rails, and a tear-down of two panels, you're already near $2,000 on a fence that will keep failing. That's the 30–40% rule showing up as dollars.
Beware the "we can just patch it" estimate on a clearly failing fence. If posts are rotting and someone offers to bolt the leaning sections back upright cheaply, that fix is buying months, not years — and you'll pay for the real replacement anyway, on top of the patch. Get an honest assessment of the posts before agreeing to any partial repair.
If it's a shared or property-line fence
When the fence sits on a line you share with a neighbor, the repair-vs-replace decision is also a who-pays decision. In Oregon, a line fence is generally a shared responsibility, but you can't simply replace it and hand your neighbor a bill — the clean path is a written agreement before any work starts. We break down the rules, the split, and how to handle a neighbor who won't chip in on our dedicated page: who pays when replacing a fence.
Ready to fix or replace it?
Once you've decided, the next step is a real set of eyes on the actual posts. If you've decided to repair, our Portland fence repair page covers what a repair pro handles and how to get matched with one. If you're replacing, an on-site estimate against your real lot is the only way to a firm number.
Not sure which side of the line you're on?
We'll match you with one vetted Portland pro who'll inspect the posts, tell you straight whether it's a repair or a replacement, and give you a free written estimate either way.
Get a free estimate →