Deck Repair Cost Calculator

In 2026, deck repair typically costs $5 to $20 per square foot of deck, so repairing a 300 sq ft deck often runs about $1,500 to $6,000 depending on the work. Simple jobs like replacing a few boards or fixing railings are at the low end, while structural repairs to joists, beams, posts, or the ledger board — and full resurfacing — cost more. The price depends on what's being fixed, the decking material, how widespread the damage is, and the deck's height (elevated and multi-level decks are harder to work on). Most contractors also have a minimum charge for small repair visits.

It comes down to how much of the deck is sound. If the structural frame — the joists, beams, posts, and ledger — is solid and only the surface boards or railings are worn, repairing or resurfacing is usually far more cost-effective than a full rebuild. But if the framing is widely rotted, posts are failing, or the ledger connection to the house is compromised, replacement often makes more sense, because you'd be spending heavily to repair a deck that's near the end of its life. A good rule of thumb: if repairs would cost more than about half the price of a new deck, or the structure is unsafe, lean toward replacement. A structural inspection can settle it.

The most frequent deck repairs are replacing rotted, cracked, splintered, or warped surface boards; fixing or replacing wobbly railings and balusters (a major safety item); re-securing popped nails and loose fasteners; repairing or rebuilding stairs; and addressing structural problems like rotted joists or posts and, critically, a failing ledger board where the deck attaches to the house. Re-sealing or re-staining is also common to protect the wood. Of these, anything structural — especially the ledger and posts — is the most important to address promptly, because ledger and structural failures are the leading cause of deck collapses. Cosmetic board and railing issues are less urgent but affect appearance and usability.

The ledger board is the horizontal board that attaches the deck to the side of your house, and it carries a large share of the deck's load. If it's improperly attached, rotted, or not flashed correctly, water can get behind it and into the home's rim joist, and in the worst case the deck can pull away from the house and collapse — ledger failure is one of the most common causes of serious deck accidents. That's why deck repairs often include inspecting and re-flashing the ledger and checking that it's fastened with proper lag bolts or structural screws (not just nails). This calculator includes a ledger re-flashing add-on. If there's any sign of rot or water staining at the house connection, have it evaluated right away.

Often, yes — if the underlying structure is sound. Resurfacing (also called re-decking) means removing the old surface boards and installing new ones — sometimes upgrading to composite — on top of the existing joists and beams, which can give you essentially a 'new' deck surface at a fraction of the cost of a full rebuild. The key is that the frame must be inspected first: the joists, beams, posts, and ledger need to be solid, properly spaced, and up to code to support new decking (especially heavier composite). If the framing is rotted or undersized, it has to be repaired or reinforced before new boards go down. This calculator offers a 'full resurface' scope for exactly this kind of project.

Yes, mainly through the cost of replacement material. Pressure-treated wood is the most economical to repair, cedar and redwood cost a bit more, and composite/PVC and tropical hardwoods like ipe are the most expensive per board. Matching existing boards can also be a factor — older or discontinued composite colors and weathered wood can be hard to match exactly, which sometimes pushes toward resurfacing a whole section for a uniform look. Composite is low-maintenance and won't rot, but it's pricier upfront and the framing must be able to support it. This calculator lets you pick the decking material so the estimate reflects the right replacement cost.

It depends on the scope and your local rules. Cosmetic repairs like swapping out a few boards or re-staining generally don't require a permit. However, structural work — replacing joists or beams, changing posts or footings, repairing or re-attaching the ledger, rebuilding stairs, or altering the deck's size or height — often does require a permit and inspection, because those affect safety and must meet building code. Railing height and baluster spacing are also code-regulated. When in doubt, check with your local building department, especially for anything structural. A licensed deck contractor will know what's required and can pull permits. This calculator includes an inspection add-on for peace of mind on older decks.

It varies with the scope. Minor repairs — replacing a handful of boards, tightening railings, or fixing popped fasteners — can often be done in a few hours to a day. Replacing more boards, repairing railings throughout, or rebuilding stairs typically takes one to two days. Structural repairs and full resurfacing take longer, often two to four days or more, especially if framing must be reinforced or the ledger re-flashed, and elevated decks slow the work down. Adding a fresh stain or seal afterward requires dry weather and cure time. A contractor can give a timeline after inspecting the deck, since hidden rot discovered once boards come up can expand the scope.