Soft boards, a railing that wobbles, stairs that move when you step on them. Most deck problems can be fixed without tearing the whole deck down, as long as they're caught before the frame rots.
Common deck repairs
Rotted or cracked boards. Single boards wear out first near the house, under downspouts, and where planters or doormats sat. A builder can swap them out. Matching color on old wood is hard, so some people replace a full section or stain the whole deck afterward.
Loose or popped nails and screws. Nails work their way up as wood shrinks and swells. They get replaced with deck screws, which hold better.
Wobbly railings. Railing posts that were only nailed to the outside of the rim board loosen over time. The fix is blocking and through-bolts, or a post anchor system. On a deck more than a few feet off the ground, this repair shouldn’t wait.
Bad stairs. Stringers rot where they sit on the ground, treads crack, and risers end up uneven. Stairs often need full replacement because the stringers take the most water. New stairs should sit on a concrete pad, not on dirt.
Sagging joists. A dip in the floor usually means a joist is cracked, undersized, or rotted at the hanger. Joists can be sistered with new lumber, and rusted hangers replaced.
Ledger flashing. If there’s no flashing where the deck meets the house, water runs behind the ledger and rots it and the house rim joist. Adding flashing usually means pulling the first few boards. It’s one of the most valuable repairs you can do.
Posts and footings. Posts buried in the ground rot at the base. A builder can jack the deck, cut the post, and set it on a metal base and a proper footing. Footings that heaved because they weren’t 42 inches deep may need to be redone.
Repair or replace?
Repair makes sense when the problems are limited to boards, rails, stairs, or a few joists and the ledger and footings are sound.
It’s usually time to replace the deck when:
- The ledger or house rim joist is rotted.
- More than a few joists are soft.
- Posts are buried and the footings are shallow.
- The repair list adds up to more than half the cost of a new deck.
A good builder will tell you which side of that line your deck is on. If they recommend full replacement, ask them to show you the rot.
A quick check you can do yourself
Once a year, take a flashlight and a screwdriver:
- Look at the ledger from underneath. Is there metal flashing over the top? Are there bolts or lag screws, or only nails?
- Push the screwdriver into the ledger, a few joists, and the bottom of each post. Firm wood resists. Rotten wood lets the tip sink in a quarter inch or more.
- Shake each railing post. It shouldn’t move more than slightly.
- Look at the joist hangers. Heavy rust or flaking metal means they’re failing.
- Walk the stairs and check for bounce, loose treads, or stringers sitting on soil.
If you find something, take a photo. Builders can often tell from photos whether a visit is needed.
What repairs cost
| Repair | Typical range |
|---|---|
| Replace a few boards | $300–900 |
| Re-secure a railing (per section) | $250–600 |
| New set of wood stairs (3–5 steps) | $900–2,500 |
| Sister several joists | $600–2,000 |
| Add ledger flashing (pull and reset boards) | $800–2,500 |
| Replace a post and footing | $700–1,800 |
Many builders have a minimum charge for small jobs. Bundling repairs into one visit saves money.
Common questions
Do deck repairs need a permit?
Small repairs like boards and railings usually don’t. Structural repairs, like new footings, a new ledger, or a new set of stairs, often do. It varies by town, so the builder should check.
Can you match my old boards?
New pressure-treated wood will look different from weathered wood for a season or two. Staining the whole deck after the repair evens it out. Composite colors change over the years and some are discontinued, so a close match isn’t always possible.
When should I repair my deck?
Spring and early summer are busy. Late summer and fall are easier to book. Safety issues like a loose railing or a rotted stair should be fixed right away.
Is a small repair worth a call?
Yes. Some builders take small jobs in slower weeks, and they can tell you if there’s a bigger problem coming.
Tell us about your deck.
Size, what’s wrong with it now, or what you’d like to build. Photos help.