A few soft, cracked or rotted boards don't always mean a new deck. If the framing underneath is solid, replacing just the bad boards is a fast, affordable repair. The key word is "if."
CHECK THE FRAME FIRST
Before replacing boards, check what's under them:
- Probe the joists with a screwdriver under the bad boards. If it sinks in easily, the joist is rotting too.
- Look at the ledger board where the deck attaches to the house, and its flashing.
- Check posts at the ground and the beam connections.
- Look for missing hardware: joist hangers, lag bolts, post brackets.
Rotted boards often sit above rotted joist tops, because water sits there. Joist tape on repaired joists helps prevent repeat rot.
MATCHING OLD BOARDS
New pressure-treated boards will be lighter and greener than weathered ones. Options:
- Accept the mismatch and let them weather (6 to 12 months).
- Stain the whole deck after the new boards dry out. See when to stain new pressure-treated wood.
- Move good boards from a hidden area (under a grill or planter) to the visible spot, and put new boards where they won't show.
WHEN BOARDS AREN'T ENOUGH
- More than 25 to 30 percent of boards are bad
- Several joists are soft
- The ledger isn't properly bolted or flashed
- The deck is 25+ years old and railings are loose
At that point a re-deck (new boards over a repaired frame) or full rebuild makes more sense.
TYPICAL COSTS
| Repair | Typical DMV Cost |
|---|---|
| Replace 1–5 boards | $250 – $600 |
| Replace 6–15 boards | $600 – $1,400 |
| Sister a rotted joist | $150 – $350 each |
| Full re-deck, 12×16 (pressure-treated) | $3,500 – $6,000 |
| Full re-deck, 12×16 (composite) | $6,500 – $11,000 |
Replace soft boards promptly. A foot going through a rotted deck board is one of the most common deck injuries, and it's easy to prevent.
RELATED READING
DECK REPAIR & REFINISHING COST GUIDE: DMV (2026)
Board replacement, structural repairs, refinishing — what deck work costs in the DMV and when it makes more sense to replace than repair.
COMPOSITE DECK BOARDS ON AN OLD WOOD FRAME?
Joist spacing, frame inspection, ledger flashing and what redecking costs.
WHEN TO STAIN A NEW PRESSURE-TREATED DECK
How long to wait, the water drop test, and what goes wrong when stain goes on too soon.
Planning a project? See our Deck Repair service page for scope, process and recent work.
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