Deck Repair & Replacement in Salt Lake City, UT

Deck repair and replacement decisions should start under the deck, not on top of it. Worn or split boards are easy to see and fairly easy to fix. The parts that decide whether a deck is safe are underneath: the ledger where it attaches to the house, the joists and beams, the posts, and the footings. Many decks in Salt Lake City were built decades ago, and older builds often have shallow footings, nailed connections or ledgers with no flashing. We inspect those first and tell you plainly whether a repair makes sense.

Freeze-thaw damage

Salt Lake City freezes on about 127 days a year, and the ground can freeze down to the city's listed 30-inch frost depth. A footing that sits above that line can be lifted when the soil freezes and then settle back unevenly when it thaws. Over years that shows up as a deck that slopes, stairs that pull away from the landing, doors that rub, or railing posts that lean. Fixing it usually means new footings dug to proper depth and the posts reset on them.

Ledger and flashing problems

Where a deck attaches to the house, water can get behind the ledger board and rot both the ledger and the house rim joist. Signs include dark staining on the siding below the deck, soft wood when you probe the ledger, or rust streaks from fasteners. A failing ledger is the most serious deck repair, because the deck depends on it. Repair means removing boards near the house, replacing damaged wood, adding proper flashing and fastening the ledger with the bolts or lag screws the plan calls for.

Boards, joists and railings

Individual boards that are split, cupped or soft can be replaced, though matching weathered wood is rarely exact. Joists can sometimes be sistered, meaning a new joist fastened alongside a weak one. Loose railing posts are a common and important fix, since a guard has to resist a person leaning or falling against it. Stairs that bounce or have loose treads usually need new stringers or better attachment at the top and bottom.

When replacement makes more sense

If the ledger, several joists and the footings all need work, rebuilding is often the better value, and it lets you change the size, layout or material. Angi's 2026 figures put typical deck replacement around $8,000, and list demolition and removal of an old deck at about $5 to $15 per square foot. A replacement on an existing footprint still needs a permit when the deck is attached or high enough to require one, and it has to meet current code, including guards and stair rules.

Resurfacing an old frame

Sometimes the frame is sound and only the boards are worn. In that case new decking, wood or composite, can go on the existing frame. Composite often needs joists at 16 inches on center or closer, so we check spacing first; older decks framed at 24 inches may need added joists.

Signs it is time to call

• Boards that feel soft or spongy
• A railing that moves when you push on it
• Posts that lean or stairs that have separated
• Rust on hangers, bolts or nails
• Staining or rot on the house wall beside the deck
• A deck that has visibly settled or tipped