How often should you inspect a deck for safety?
Updated July 2026
Give your deck a real safety inspection once a year, ideally in spring before you start using it. This is not about how the boards look; it is about the connections that keep the whole structure attached to the house and standing up. Focus on four things: the ledger board where the deck bolts to the house, the joist hangers, the post bases, and the railings. Ledger and railing failures are what cause the collapses and falls that put people in the emergency room, so treat this as life safety, not upkeep.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Ledger board (deck-to-house connection) | Every year, closely | The number-one cause of deck collapses; must be lag-bolted and flashed, never just nailed |
| Joist hangers and fasteners | Every year | Look for rust, popped nails, and hangers pulling away from the beam |
| Post bases and footings | Every year | Posts rot at the base where they meet concrete or soil; check for give and decay |
| Railings and balusters | Every year, push on them | A loose rail is a fall hazard; code expects it to resist about 200 lbs of force |
| Deck boards and stairs | Every year | Soft, cracked, or springy boards and wobbly stair stringers signal rot |
| Decks over 15 years old | Twice a year | Older fasteners and framing deserve a closer, more frequent look |
| After a hard freeze or heavy snow load | Re-check connections | Freeze-thaw and load cycles loosen fasteners and split wood |
The cost of skipping it
Why this one is different: most maintenance failures cost money, but a deck failure costs people. A ledger board that was nailed instead of bolted, or one whose flashing let water rot the rim behind it, can let the entire deck peel off the house while it is full of guests. Catching a loose connection early is a $200–500 fix: new bolts, hangers, or a post base bracket. Miss it and you are looking at a partial rebuild or a collapse with injuries. A full deck lasts 10–30 years; the annual check is what gets it to the top of that range safely.
How to do it (30 minutes · DIY inspection)
- Start at the ledger board: confirm it is fastened with lag bolts or structural screws (not just nails) and that flashing sheds water over it.
- Probe the ledger, rim joists, post bases, and stair stringers with a screwdriver; if it sinks into soft wood, that is rot.
- Grab and shake the railing and lean into the balusters; anything that moves or flexes needs to be re-secured.
- Look under the deck at the joist hangers for rust, missing nails, or hangers pulling loose.
- Check for loose or protruding fasteners, springy boards, and any wobble in the stairs.
- Tighten hardware, replace rusted fasteners with proper structural ones, and call a pro for any ledger, framing, or footing problem.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing deck safety inspections schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
What actually causes deck collapses?
The overwhelming culprit is the ledger board connection, the point where the deck attaches to the house. When a ledger is fastened with nails instead of lag bolts or structural screws, or when missing flashing lets water rot the rim joist behind it, the deck can pull straight off the wall under a crowd's weight. Rotted posts and failed railings account for most of the rest. That is why the annual inspection zeroes in on connections and fasteners, not on how weathered the surface boards look.
How do I test whether my deck railing is safe?
Grab the top rail and push and pull hard, then lean your weight into a few balusters. Building codes expect a guardrail to resist roughly 200 pounds of force applied in any direction, so it should feel rock solid, not wobbly. Any flex, movement at the posts, or gaps opening at the connections means loose or rotted fasteners that need attention before anyone leans on it. Railing posts should be bolted through the framing; a rail that is only surface-screwed to the decking is a fall waiting to happen.
What are the signs of deck rot?
Wood that is soft, spongy, or crumbly when you press a screwdriver into it, especially at the ledger, the post bases where they meet the ground, and the ends of joists. Look for dark discoloration, mushrooms or fungal growth, and boards that stay damp long after rain. Popped or heavily rusted fasteners point to moisture working on the wood around them. Rot loves the hidden connections, so probe underneath and at the house wall, not just the walking surface you can see.