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Find a verified pro near you →The average deck replacement costs $14,000 to $22,000. The average deck repair — caught early in spring — costs $500 to $1,500. The difference between those two numbers is one 20-minute inspection you’re probably not doing.
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Wood rot doesn’t announce itself. It starts underneath, where you can’t see it, and by the time the surface shows damage, the structural framing may already be compromised. Spring is the only time of year when the damage from winter freeze-thaw cycles is fully visible — before summer heat dries and hides the evidence.
Here are the five warning signs to check this weekend, what each one costs to fix now versus later, and when to call a pro.
Partial Rebuild: $2,000–$5,000
Full Replacement: $14,000–$22,000
Deck rot is the progressive decay of wood caused by moisture-loving fungi that break down cellulose fibers. It accelerates during winter when water seeps into cracks, freezes, expands, then thaws — creating the perfect conditions for fungal growth. Spring inspection catches rot at the surface stage ($500 fix) before it reaches joists and ledger boards ($14,000+ replacement).
A $19,000 Lesson from a Chicago Suburb
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The 5 Warning Signs (In Order of Severity)
Check these five areas this weekend. All you need is a flathead screwdriver, a flashlight, and 20 minutes.
Press a flathead screwdriver into the wood at a 45-degree angle. Healthy wood resists — the screwdriver barely dents it. Rotting wood lets the blade sink in with almost no pressure. Test every board, especially where water pools or near the house connection. Soft spots that are limited to the surface of individual boards can be repaired for $200–$400 per board. If the screwdriver sinks more than ¼ inch, the rot has reached the interior and that board needs full replacement ($50–$150 per board installed).
Dark patches or grayish-black streaks that don’t wash away with water are signs of fungal growth beneath the surface. This is different from normal weathering (which turns wood uniformly gray). Fungal discoloration appears in blotches, often near joints or where boards meet. Surface-level fungal staining can be treated with a deck brightener and sealant ($100–$300 DIY, $300–$600 professional). If the discoloration comes with softness, the rot is already active.
Nails or screws lifting out of the wood is a major red flag. When wood rots, it loses the density that holds fasteners in place. A few popped nails on surface boards are a simple fix ($100–$200 to re-fasten with structural screws). But if fasteners are pulling out of joists or the ledger board — the structural frame that connects your deck to your house — stop walking on the deck and call a professional immediately. Joist replacement runs $1,000–$3,000 per joist.
Walk the entire deck slowly and pay attention to any give or bounce under your feet. A properly built deck should feel solid — like walking on a floor. Any flex or bounce means the substructure (joists, beams, or posts) is weakening. This is structural rot, and it’s the most expensive kind to ignore. A section of compromised joists can be sistered (reinforced) for $1,500–$3,000. Wait until the deck visibly sags and you’re looking at a full tear-down and rebuild: $14,000–$22,000 for a standard 300-square-foot deck.
The ledger board is the horizontal beam bolted directly to your house that supports one entire side of the deck. If this board shows any sign of rot — softness, discoloration, or movement when pushed — your deck is a collapse risk. Ledger board failures are the number one cause of deck collapses in the United States, according to the North American Deck and Railing Association. This is not a DIY fix. A contractor needs to remove the old ledger, inspect the rim joist behind it for water damage, install proper flashing, and bolt a new pressure-treated ledger. Cost: $1,500–$4,000 depending on deck size and whether the house framing behind it is also damaged.
Fix Now vs. Fix Later: The Real Math
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Find a verified pro near you →Replace individual rotted boards, re-fasten loose fasteners, apply sealant. 1-day job. If delayed → spreads to substructure.
Sister or replace compromised joists. 2-3 day job. If delayed → full structural failure.
Remove old ledger, inspect house framing, install flashing + new pressure-treated ledger. If delayed → deck collapse + home water damage.
Complete tear-down and rebuild for a 300 sq ft deck. 1-2 week job. The cost of ignoring signs 1–4.
What You Can DIY vs. What Needs a Pro
$0 — DIY
$100–$300 — DIY
$200–$750 — DIY or Pro
$1,500–$3,000 — PRO ONLY
$1,500–$4,000 — PRO ONLY
$14,000–$22,000 — PRO ONLY
The Spring Deck Maintenance Playbook
If your inspection turns up no rot (or only surface-level issues), here’s the annual maintenance that keeps it that way:
- Clean: Power wash or scrub with a deck cleaner to remove mold, mildew, and debris. $50–$150 for materials or $150–$400 for a professional cleaning.
- Brighten: Apply a wood brightener (oxalic acid solution) to restore natural color. $20–$40 for materials.
- Repair: Replace any boards, screws, or fasteners identified during inspection. If you need a handyman near you for board replacement, spring is the best time to book — before summer demand spikes.
- Seal or Stain: Apply a penetrating water-repellent sealant or semi-transparent stain. This is the single most important step — it blocks the moisture that causes rot. $150–$400 DIY, $500–$1,200 professional. Wait for 2–3 consecutive days of dry weather above 50°F.
- Document: Take photos of your deck’s condition each spring. If you ever sell your home, documented maintenance history is proof of care that supports your asking price. Homes with well-maintained decks see a 65–75% return on investment at resale.
When to Call a Professional
Surface cleaning, sealing, and replacing a few boards are solid DIY projects. But call a licensed contractor for any of these situations:
- The screwdriver sinks more than ¼ inch into any structural member (joist, beam, post, or ledger)
- You notice bounce, flex, or sagging when walking on the deck
- Fasteners are pulling out of joists (not just deck boards)
- The ledger board shows any sign of rot or movement
- Your deck was built before 2004 (potential CCA lumber)
- Railing posts wobble or feel loose when pushed
Spring is the best time to book — contractors are available and pricing is competitive. By June, most are booked out 3–4 weeks. Compare bids from verified, identity-verified pros on AllBetter — it’s free for homeowners to post, and every payment is escrow-protected.
This spring inspection is one item on a larger list. If you haven’t already, work through a complete seasonal home maintenance checklist to catch every system before summer puts it under load.
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Frequently Asked Questions
How can I tell if my deck has rot?
Press a flathead screwdriver into the wood at a 45-degree angle. If it sinks in easily — especially more than ¼ inch — the wood is rotting. Also check for dark staining, popping nails, sponginess underfoot, and any bounce or flex when you walk across the deck.
How much does it cost to repair a rotting deck?
Minor board repairs cost $200–$750. Joist repairs run $1,500–$3,000. Ledger board replacement costs $1,500–$4,000. A full deck replacement for a 300-square-foot deck averages $14,000–$22,000. Early spring repair typically saves 80–90% compared to waiting until the damage is structural.
How often should I seal or stain my deck?
Apply a penetrating sealant or semi-transparent stain every 2–3 years. Clear sealants last only about 1 year. The best time to apply is spring after cleaning, during a stretch of 2–3 dry days above 50°F.
Can I repair deck rot myself?
Surface-level rot on individual deck boards is a solid DIY project — you can replace boards for $50–$150 each. However, any rot in structural members (joists, beams, posts, or the ledger board) should be handled by a licensed contractor because these components bear the weight of the entire deck.
Is a rotting deck dangerous?
Yes. Deck collapses cause over 2,000 injuries per year in the United States according to the Consumer Product Safety Commission. Ledger board failures are the leading cause. If your deck bounces, sags, or has loose structural fasteners, stop using it and call a professional immediately.
What’s the best deck material to prevent rot?
Composite decking (Trex, TimberTech) and PVC decking are rot-proof but cost $30–$60 per square foot installed versus $15–$25 for pressure-treated wood. If staying with wood, use pressure-treated southern yellow pine or naturally rot-resistant species like cedar or redwood, and maintain an annual seal/stain schedule.
When is the best time to inspect my deck?
Early spring (March–April) is the best time. Winter freeze-thaw cycles expose damage that summer heat can dry and hide. Check your deck as part of your annual home maintenance routine.
Related reading:
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