Deck Post Replacement Cost

Replacing a deck post costs $200–$500 per post installed in 2026. The post itself is the cheapest part — $30–$80 in lumber. You're paying for the skilled, slightly nerve-wracking labor: shoring up the deck, removing the failed post, fixing the footing, and setting the new post plumb. Done as a batch, posts price at $150–$400 each. Posts fail from the bottom up — rot at grade is the #1 cause — so this guide also covers the footing and connection details that decide whether the new post lasts 5 years or 25. For the broader picture, see our deck repair cost guide.

Deck post replacement cost breakdown

Where the money goes on a typical $400 post: $30–$80 post and hardware, $40–$100 concrete and bracket, and $250–$350 labor for 2–4 hours of jacking, removal, and setting. The footing is the variable — digging out an old buried post and pouring a proper pier below frost line is real excavation work.

Why posts fail (and how to spot it)

• Buried in soil or concrete. The #1 killer. Wood in direct ground contact wicks moisture and rots from the bottom up. Probe the bottom 6 inches with a screwdriver — if it sinks in, the post is done.
• No standoff bracket. Posts sitting flat on concrete still wick water. Modern code wants a galvanized standoff base holding wood 1" above the pier.
• Undersized or shallow footings. Pads above the frost line heave every winter, working connections loose. The deck settles unevenly and posts take side loads they weren't designed for.
• Beam connection failure. Posts nailed to the side of a beam (instead of bearing under it with proper connectors) eventually work loose. Look for gaps opening between post tops and beams.

Warning signs that mean act now, not next spring: visible lean, the deck bouncing or settling near a post, fungal growth or mushroom-like brackets on the wood, and any post you can rock by hand. A failed post shifts load to its neighbors — one bad post becomes three.

How a post is replaced (the safe way)

1. Shore the beam. Set temporary jack posts or cribbing under the beam on both sides of the failed post. The temporary supports carry the full load — size them like the real thing.
2. Take the load. Jack the beam up just enough to free the old post — typically 1/4 to 1/2 inch. Never over-jack; you'll crack drywall inside or pop deck boards.
3. Remove the old post. Cut or unbolt it out. Dig out the old footing if it's undersized, shallow, or crumbling — this is the step cheap quotes skip.
4. Pour the new footing. Below frost line, proper diameter (typically 12" for a 4×4, larger for 6×6), with a J-bolt or embedded bracket. Let it cure — don't load green concrete.
5. Set the new post. Pressure-treated lumber rated for ground contact, cut to length, set plumb on a standoff bracket, connected to the beam with proper post-to-beam connectors — not toenails.
6. Transfer the load and remove shoring. Lower the jack slowly, verify the beam sits fully on the new post, and remove temporary supports.

Steps 1 and 2 are why this isn't a casual DIY job. A 300 sq ft deck section can weigh over a ton; a slipped jack or an undersized temporary post turns a repair into an emergency. Pros do this weekly — hire it out unless you've done structural shoring before.

Post and footing materials

When posts mean bigger trouble

One rotted post on an otherwise healthy deck is a $350 repair. But certain patterns mean the quote needs to grow — or the deck needs replacing:

• Every post is soft at grade. The whole deck was built wrong (buried posts, no footings). Replacing posts one by one is triage; price the full structural rebuild.
• Posts are fine but the beam is rotted. Water traps where posts meet beams. Beam replacement ($800–$2,000) often rides along with post work.
• The ledger is also failing. Posts + ledger both bad = the deck's two support systems are compromised. This is replacement territory — see deck replacement cost.
• Settling continues after repair. If the deck keeps moving after new posts and footings, the soil is the problem (expansive clay, poor drainage). That's a geotechnical conversation, not a carpentry one.

How long does post replacement take?

A single straightforward post replacement is a half-day job: 2–4 hours for an experienced two-person crew. The timeline:

• Shoring and jacking: 30–60 minutes — the careful part, never rushed.
• Old post and footing removal: 30–90 minutes — digging out the old footing is the wildcard.
• New footing pour: 30–45 minutes of work, then cure time. Pros often pour the footing, do other work, and return — or use fast-setting concrete to keep it same-day.
• Setting and connecting: 30–60 minutes — cut to length, set plumb, connect, transfer load.

Batch work is much faster per post — a crew doing 6 posts doesn't take 6× the time. Shared mobilization, one concrete delivery, and rhythm on the jacking bring it to roughly 1–1.5 hours per post. That's why batch pricing ($150–$400/post) beats single-post pricing so decisively.

Pro vs. DIY: an honest split

The DIY math is tempting — $100–$200 in materials and rentals vs. $400 hired. But the failure mode is a dropped beam, and the savings evaporate the moment anything goes sideways. This is one of the few deck jobs where the professional premium is genuinely buying safety, not just convenience. If you DIY, rent proper jack posts (not a car jack), never work under an unshored beam, and pull the permit so the inspector checks your footing and connections.

Costly mistakes to avoid

• Setting the new post in dirt. Repeating the original sin. Concrete pier, standoff bracket, every time.
• Reusing a bad footing. A shallow or crumbling pad will fail the new post exactly like it failed the old one. Dig it out.
• Toenailing the beam connection. Nails in shear are not a post-to-beam connection. Use rated connectors — inspectors check this first.
• Over-jacking the beam. A quarter inch frees the post; an inch cracks things. Jack slowly, watch everything.
• Skipping the permit. Structural work needs a permit ($50–$200) in most cities. The inspection verifies footing depth and connections — the two things that matter.
• Fixing one post and ignoring its neighbors. Posts on the same deck share age, soil, and construction. Inspect them all; quote the batch honestly.

Price posts, concrete, and brackets in the deck & fence calculator, then build the quote. Contractors: post jobs are trust jobs — the homeowner is scared of the jacking. Walk them through the shoring plan in plain language on the estimate, and the job is yours to lose.