Deck Repair vs. Replace
Should you refinish, repair, or replace your deck? Answer two questions about its size and condition and get a recommendation — plus the cost of all three, with pressure-treated wood vs. composite for a rebuild.
Refinish it, repair it, or tear it out and rebuild? Enter your deck's size and honest condition, and this tool recommends the right path — and shows what all three options cost side by side, so you can decide based on the structure, not just how the boards look.
Deck size
Total square footage of the deck surface (length × width). A typical backyard deck is around 200–400 sq ft.
Deck condition
Judge the FRAME, not just the boards. Probe posts, joists, and the ledger (where the deck attaches to the house) with a screwdriver — if it sinks in easily, that's rot, and rot means replace.
If replacing, rebuild with
Sets the replacement cost. Pressure-treated wood is cheapest up front but needs regular staining; composite costs about twice as much but is low-maintenance. Doesn't affect the refinish or repair estimates.
Recommended: Repair
$3,000–$10,500
≈ 10% less than replacing · 300 sq ft
Refinish vs. repair vs. replace — your 300 sq ft deck
Repair is the right call — if the frame is sound
Swapping out a few rotted boards, re-securing railings, and refinishing runs about 10% less than a full replacement ($3,000–$10,500 vs $4,500–$10,500). This only holds if the substructure is solid. Probe the joists, posts, and especially the ledger board with a screwdriver first — if the wood is soft or you can sink the tip in easily, the deck needs replacing, not patching.
The recommendation follows standard contractor guidance: refinish a sound but weathered deck, repair isolated board/railing damage over a solid frame, and replace when the framing, posts, or ledger show rot (probe them with a screwdriver) or the deck is 20+ years old. Cost ranges are market estimates per square foot — refinish ≈ $3–7, repair ≈ $10–35, replace ≈ $15–35 (wood) or $30–65 (composite) — and vary by height, railings, access, and region. Always get local quotes, and have a pro confirm the structure before deciding.
💡About this calculator▼
A tired-looking deck forces the same decision a cracked driveway does: do you refresh it, fix the bad parts, or tear it out and start over? The trap is judging by the boards, because a deck that looks rough on top can be perfectly sound underneath — or look fine on top while the framing rots away below. This calculator helps you make the call based on what actually matters, the structure, and shows what each path costs.
There are really three options, not two. Refinishing — sanding and re-staining or sealing — brings a weathered but structurally sound deck back to life for the least money. Repairing swaps out a few rotted boards, re-secures loose railings, and refreshes the finish, which works when the damage is isolated and the frame is solid. Replacing rebuilds the deck, and it's the right (and only safe) choice when the framing, posts, or ledger board have rot. The calculator recommends one and prices all three for your deck.
The most important input is your honest read of the structure. Boards are cosmetic and cheap to swap; the frame, posts, and especially the ledger (where the deck bolts to the house) are what hold people up. Failed ledgers and rotted framing are exactly what cause the deck collapses that injure people every year — so this tool weights the recommendation toward replacement the moment structural rot enters the picture, and tells you to get it inspected rather than patch over it.
The calculator picks a recommended path from your deck's condition, then prices refinish, repair, and replace for your square footage.
Condition drives the recommendation, and the key is structural soundness:
• Weathered — the boards are gray, faded, or splintering, but the frame, posts, and ledger are solid — points to refinishing: clean, sand, and apply fresh stain and sealer.
• Some damage — a handful of rotted or cupped boards, loose or wobbly railings, but a sound substructure — points to repair: replace the bad boards, re-secure the railings, and refinish.
• Structural — soft or rotted framing, posts, or ledger; widespread rot; or a deck more than about 20 years old — points to replacement, because no amount of surface work fixes a compromised frame.
How do you tell cosmetic from structural? Probe the suspect wood with a screwdriver. If the tip sinks in more than about an eighth of an inch, or the wood feels soft or crumbly, that's rot — and rot in the joists, posts, or ledger means replace. Pay special attention to the ledger board and the bases of posts, where water collects.
Cost is estimated per square foot: a refinishing rate, a repair rate (board and railing replacement plus refinishing), and a replacement rate that depends on whether you rebuild in pressure-treated wood or composite — composite runs roughly twice the price. The calculator shows the recommended option's cost, the savings versus a full replacement, and all three side by side. These are planning ranges; height, railings, stairs, access, and region all move the number, so get local quotes.
📐How it's calculated▼
The recommendation is a decision rule; the costs are rate-based estimates.
Recommendation (by condition): Sound frame, weathered boards → Refinish Sound frame, isolated damage → Repair Rotted framing / ledger / posts, or 20+ yr → Replace
Cost of each option: Cost = deck area (sq ft) × rate per square foot
Approximate market rates (per sq ft): Refinish (sand + stain/seal): $3–$7 Repair (boards + railings + refinish): $10–$35 Replace — pressure-treated wood $15–$35 · composite $30–$65
Example: A 300 sq ft deck that's weathered but structurally sound →
→ Recommendation: Refinish
→ Refinish: 300 × $3–$7 = about $900–$2,100
→ Replace (wood): 300 × $15–$35 = about $4,500–$10,500
→ Refinishing costs roughly 80% less than rebuilding — the right move when the structure is solid.
📎Sources:Decks.com — When to Repair vs Replace Your Deck (thresholds, probe test, costs),Premium Decking Supply — Deck Replacement Cost (pressure-treated vs composite per sq ft),CountBricks — Deck Refinishing Cost per Square Foot
🔍Finding your inputs▼
Deck size: The square footage of the deck surface — length × width. Measure the walking area; you don't need to account for railings or stairs separately, the per-square-foot rates fold typical railing work in. A small deck is under 200 sq ft, a typical backyard deck 200–400, and a large or wraparound deck 500+.
Deck condition — judge the frame, not the boards. This is the input that decides everything, so be honest and actually check the structure: • Weathered — the surface boards are gray, faded, rough, or lightly splintered, but everything underneath is solid. The deck feels firm, the railings are tight, and probing the framing with a screwdriver meets firm resistance. This is a refinishing job. • Some damage — a few boards are rotted, cracked, or cupped, or a railing or two is loose, but the joists, beams, posts, and ledger are still sound. Isolated, fixable problems on a good frame. This is a repair. • Structural — you find soft, spongy, or crumbling wood in the joists, posts, or the ledger board; the deck feels bouncy or wobbly; there's widespread rot; or it's more than ~20 years old. These are safety problems. This is a replacement, and you should have it inspected.
If replacing, rebuild with: Sets the replacement cost only. Pressure-treated wood is the budget choice but needs staining or sealing every year or two. Composite costs roughly twice as much up front but is nearly maintenance-free and lasts longer. It has no effect on the refinish or repair estimates, since those keep your existing deck.
⚠️Special situations▼
How do I tell if my deck's frame is rotted or just the boards?
Probe it. Take a screwdriver or awl and press it into the suspect wood — the joists, beams, posts, and especially the ledger board where the deck attaches to the house. Sound wood resists; if the tip sinks in more than about an eighth of an inch, or the wood feels soft, spongy, or crumbles, that's rot. Surface boards rot from the top and are cheap to replace; structural members rot from trapped moisture at connections and post bases, and that's a replacement. Also feel for movement: a deck that bounces, sways, or has a wobbly railing is signaling a structural problem. When the framing is involved, get it inspected rather than guessing.
Is it cheaper to repair or replace a deck?
Repair is cheaper when the damage is isolated and the frame is sound — swapping a few boards and refinishing costs a fraction of a rebuild. But the gap narrows fast as the damage spreads: replacing many boards is labor-intensive, and if you're also chasing rot into the framing, you can spend most of a replacement's cost on a repair that doesn't last. The rule of thumb contractors use: if more than a third or so of the deck needs work, or any structural member is rotted, replacement is usually the better value. Replacing also lets you upgrade materials and bring the deck up to current code, which an old deck often isn't.
My deck looks gray and rough — does that mean it's bad?
Usually not. Graying is just UV weathering of the surface; the wood underneath the silvered layer is typically fine. A deck that's gray, faded, or lightly splintered but still solid underfoot, with tight railings and firm framing, is a refinishing job — pressure-wash, sand, and apply fresh stain and sealer, and it looks new again for a few hundred to a couple thousand dollars. The time to worry is when the gray comes with soft spots, cupping, widespread cracking, or movement. Cosmetic weathering is the cheapest problem a deck can have; don't let it scare you into a replacement you don't need.
Should I rebuild with wood or composite?
It's a cost-versus-maintenance trade-off. Pressure-treated wood is roughly half the price of composite up front, but it needs cleaning and re-staining or sealing every one to two years, and it weathers and can rot over 15–20 years. Composite (and PVC) costs about twice as much to install but is nearly maintenance-free — no staining, no rot, no splinters — and lasts 25+ years, so it often wins on total cost of ownership if you'll stay in the home long-term. Wood makes sense for a tight budget or a deck you won't keep long; composite makes sense for a forever deck where you don't want the upkeep. The calculator prices a rebuild both ways.
What's the ledger board, and why does it matter so much?
The ledger is the board that bolts the deck to the side of your house, and it carries a huge share of the deck's load. A large majority of deck collapses start at a failed ledger connection — either it was nailed instead of properly bolted and flashed, or water got behind it and rotted the ledger or the house's rim joist. That's why it's the first thing to check: probe the ledger and the area around it for soft wood and look for proper flashing and lag bolts or structural screws. If the ledger or the framing behind it is rotted, the deck is unsafe and needs replacement with a correctly flashed, bolted connection — this is not a DIY patch, and it's the clearest case for replace over repair.
❓Common questions▼
Should I repair or replace my deck?
It comes down to the structure. If the frame, posts, and ledger board are solid and only the surface boards are weathered, refinish or repair — both are far cheaper than replacing. If you find rot in the framing, soft or wobbly posts, a failing ledger, or the deck is more than about 20 years old, replace it, because no surface fix makes a compromised structure safe. Probe the framing with a screwdriver: if it sinks in easily, that's rot and you should replace. Enter your deck's size and condition in the calculator above for a recommendation and the cost of all three options.
How much does it cost to replace a deck?
Deck replacement typically runs about $15–$35 per square foot for pressure-treated wood and $30–$65 per square foot for composite, installed — so a 300-square-foot deck is roughly $4,500–$10,500 in wood or $9,000–$19,500 in composite. The wide range reflects the deck's height, the amount and style of railing, stairs, demolition of the old deck, permits, and your region. Composite costs about twice as much as wood up front but needs almost no maintenance. Use the calculator to estimate your deck both ways.
How much does it cost to refinish or repair a deck?
Refinishing — pressure-washing, sanding, and applying fresh stain and sealer — runs about $3–$7 per square foot, or roughly $900–$2,100 for a 300-square-foot deck. Repairs (replacing rotted boards, re-securing railings, then refinishing) run about $10–$35 per square foot depending on how much needs replacing. Both assume a structurally sound frame; they're the cost-effective choice for a deck whose problems are cosmetic or isolated. If the framing is rotted, that money is better spent on replacement, since a fresh finish over a bad structure just hides the problem.
How long does a deck last?
A pressure-treated wood deck typically lasts 15–20 years with regular maintenance (cleaning and re-staining or sealing every year or two), though it can last longer in a dry, shaded spot or fail sooner in a wet climate. Composite decking lasts 25–30+ years and the structure beneath it as long as it's built and flashed correctly. The boards usually show their age first, but the real lifespan is set by the framing and the ledger connection — keep water from sitting on and behind them and the deck lasts; let moisture work into the joints and rot shortens it. Past about 20 years, have an older deck inspected even if it looks okay.
Are old decks dangerous?
They can be. Thousands of people are injured each year in deck collapses and failures, and the common causes are old or improperly built ledger connections, rotted framing and posts, and corroded fasteners — all hidden below the surface. A deck built before modern code (roughly pre-2000s) may have a ledger that was nailed rather than bolted and flashed, which is a known failure point. If your deck is old, bouncy, or shows any soft wood in the structure, stop loading it heavily and have it inspected. This calculator flags structural conditions toward replacement specifically because patching over a failing frame is a safety risk, not just a cost question.
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