Ever wonder why your deck has started to feel a little wobbly or slightly out of level, even though nothing looks obviously broken?
Deck posts are structural — they hold everything up. A rotted or damaged post isn’t just an aesthetic issue; it’s a safety issue. If your deck is wobbling, leaning, or you’ve noticed soft wood at the base of a post, this guide covers exactly what replacement costs and what the right process looks like in Kansas City.
What Most Kansas City Homeowners Pay
Pricing last updated: September 2026
| Scope | Typical Price Range |
| Single post replacement — ground-level deck, existing footing usable | $500 – $850 |
| Single post replacement — elevated deck, existing footing usable | $750 – $1,250 |
| 2–3 posts replaced — same visit, existing footings usable | $1,100 – $2,400 |
| 4+ posts / major deck re-support (Temporary shoring needed) | $1,800 – $4,000+ |
| Post-base hardware brackets added during post replacement (per post) | $100 – $200 |
| Standalone post-base retrofit to an existing sound upper post (first post) | $400 – $600+ |
| New concrete footing/pier — first pier (excavation, auger/equipment, Sonotube, concrete, rebar) | $1,000 – $1,750+ |
| Additional piers, same visit (2nd–3rd pier) | $500 – $800 each |
| Additional piers, same visit (4th–6th pier) | $400 – $650 each |
Post replacement is structural work. The deck must be temporarily supported during the repair. Do not attempt this as a DIY project without proper shoring — a deck collapse is a serious safety hazard.
Why Does Replacing the Footing Add So Much?
Replacing a concrete deck footing is a much bigger job than replacing a wood post. If an old footing is already in place and needs replacing, you have to dig it out and haul it away first. Then a powered auger drills a new hole to the depth and width required by local code, usually at least 36 inches deep in the Kansas City area. The crew lines the hole with a tube and fills it with concrete that extends above the ground. These concrete footings are usually called piers in deck building, though people often use “footing” and “pier” interchangeably.
Before any of this starts, the deck must be safely held up and stabilized so the old post or pier can come out without anything shifting. Depending on the job and what the local inspector requires, this can take multiple visits for digging, pouring concrete, letting it cure, an inspection, and finally setting the new post.
Most of the cost is labor and equipment, not the concrete itself. Getting a powered auger to the site takes time and money before any concrete is poured, and on tight or hard-to-reach yards, you may also need a compact track loader. If an old footing needs to be removed, that adds even more labor: temporarily supporting the deck, digging out and hauling away the old concrete, then drilling and forming the new pier.
That’s why the first pier usually costs the most — it bears the bulk of the setup and equipment costs. Once the crew and equipment are on-site and the deck is shored, each additional pier in the same visit costs less because that setup cost is spread across more piers rather than one.
Why Deck Posts Fail in Kansas City
Kansas City’s climate creates specific conditions that accelerate post failure:
- Ground contact rot – posts set directly in concrete or soil trap moisture at the base, where rot almost always starts.
- Freeze-thaw heaving – posts set in shallow footings can be lifted and shifted by frost cycles.
- UV and moisture cycling – repeated wet-dry cycles cause checking and cracking, allowing water infiltration.
- Improper installation – posts installed without proper post base hardware or with inadequate concrete footings fail sooner.
- Poor quality materials – if the original posts were a lower grade or quality, they will tend to deteriorate much more quickly.
The Right Way to Replace a Deck Post
Post replacement is not as simple as pulling the old one out and dropping in a new one. Here’s the proper process:
- Assess the footing (if present) – If the concrete footing is cracked, undersized, or heaved, it must be repaired or replaced first
- Temporarily shore the deck beam – the deck must be safely supported before the post is removed
- Remove the failing post – cut free from beam connection and base
- Install post base hardware – a code-compliant post base keeps the new post off the concrete, preventing ground contact rot
- Set and plumb the new post
- Reconnect to the beam with proper hardware – the beam must have proper bearing on the post and be secured against lateral movement using an approved connection. Simply bolting a beam to the side of a post is not necessarily an acceptable load-bearing connection.
- Inspect all remaining posts while on-site
Post Base Hardware: Why It Matters
One of the most important upgrades we make during post replacement is installing proper post base hardware—specifically, a standoff post base that holds the post about 1 inch above the concrete surface.
When the footing and application allow, a properly rated standoff post base is one of the most effective ways to keep the bottom of a wood post separated from moisture at the concrete surface.
Adding this hardware while we’re already replacing the post is a modest add-on. But if your existing post is still sound and you just want a standoff base retrofitted underneath it, that’s a different project — the deck may need to be temporarily supported, the post lifted or adjusted, and the concrete connection drilled and anchored. We price those two scenarios differently, and we’ll tell you which one applies to your deck before any work starts.
When the Footing Also Needs Work
Posts sit on concrete footings that extend below the frost line. In much of the Kansas City metro, deck footings typically must extend at least 36 inches below finished grade to reach below the frost line. Footing diameter and overall size must also be adequate for the load the post carries, soil conditions, and local jurisdiction requirements. Many older decks have undersized, shallow, or no footings at all.
Signs your footing needs attention:
- Post or footing has moved — deck is out of level
- Footing is cracked or crumbling
- Post has heaved up during winter and settled back
- Deck was built before modern code requirements, with posts set in dirt or directly in concrete
If footing replacement is needed, see the pricing table above. Replacing a post with a new or replaced footing costs considerably more than a straightforward post replacement because it involves excavation, an augered hole, a formed concrete pier, and multiple visits.
Safety First: Don’t Ignore a Failing Post
A deck with a compromised post is a safety liability. We’ve seen decks collapse — not in a dramatic, movie sense, but enough to cause serious injury. If you’re noticing a wobble, a lean, or soft wood at the base of any post, call us before your next deck gathering.
Frequently Asked Questions
How do I know if my deck posts are rotting?
Look closely at the bottom of the post, especially where it meets concrete, soil, landscaping, or a post base. Soft or spongy wood, dark decay, crumbling fibers, excessive movement, or wood that a screwdriver can easily penetrate can indicate rot. Keep in mind that surface cracking or “checking” in pressure-treated lumber does not automatically mean the post is rotten.
Can I replace one deck post without replacing the others?
Yes. If the remaining posts, footings, and connections are structurally sound, you usually don’t need to replace every post just because one has failed. However, when one post has deteriorated, it’s smart to inspect the others because they were often installed at the same time and exposed to the same conditions.
Can you replace a deck post without taking the deck apart?
Usually, yes. The beam above the damaged post can typically be temporarily supported with properly designed shoring while the old post is removed and the replacement is installed. The exact process depends on the deck height, configuration, access, and the condition of the surrounding framing.
Does the concrete footing have to be replaced when the post is replaced?
Not necessarily. If the existing footing is structurally sound, properly sized, deep enough, and suitable for the new post connection, you may reuse it. A cracked, settled, heaved, undersized, or improperly installed footing may need repair or replacement.
How deep should a deck-post footing be in Kansas City?
In the Kansas City metro, deck footings typically extend at least 36 inches below finished grade to get below the frost line. Depth is only part of the requirement — the footing diameter and size must also be sufficient for the load and soil conditions, and local requirements can vary.
Why do deck posts rot at the bottom?
The base of a post is among the areas with the greatest moisture exposure. Posts buried in soil, improperly embedded in concrete, sitting directly against wet concrete, surrounded by mulch, or installed where water collects can remain wet for extended periods. Proper drainage, ground-contact-rated lumber, and an appropriate standoff post base can substantially reduce that exposure.
Can you just repair the rotten bottom of a deck post instead of replacing the whole post?
Sometimes you can address localized deterioration near the base of a post with an engineered repair instead of a full replacement. Typically, we cut off the damaged section about 2 to 3 feet above the ground, notch the upper and lower sections of sound wood, then laminate, adhere, and bolt them together to create a new, stabilized connection. If decay has reduced the post’s structural capacity beyond that point, complete replacement is usually safer and more predictable.
Note: We don’t recommend patching a load-bearing deck post with wood filler or cosmetic repair. It may look fixed, but it doesn’t restore the post’s structural strength.
What size deck post do I need — 4×4 or 6×6?
It depends on the load, height, beam and joist spans, tributary area, lumber species and applicable building code. 6×6 posts are common on modern residential decks and are required or preferred for many applications. We don’t automatically duplicate an existing 4×4 if the current structure requires something larger. The American Wood Council’s prescriptive deck guide uses 6×6 as its minimum for the deck configurations covered by that guide.
How long does it take to replace a deck post?
A straightforward post replacement on a sound existing footing can often be completed in a single workday with 1-2 technicians. If you must replace a footing, the project may require multiple visits for excavation, inspection, concrete placement, curing, and final installation. Access and the amount of temporary shoring required can also affect the schedule.
Can replacing a deck post fix a sagging or uneven deck?
Sometimes, but the post may not be the only problem. A sagging deck can also result from a settled footing, deteriorated beam, damaged joists, improper connections, or problems at the ledger board. Before lifting or leveling the deck, we would evaluate the entire load path so the repair addresses the actual cause rather than simply installing a taller post.
Do I need a permit to replace a deck post?
Possibly, and in many Kansas City-area jurisdictions, yes. Permit requirements vary throughout the Kansas City metro. Because deck posts are structural, you may need a permit and inspection, especially if you replace a footing, alter the framing, or change the original structural design. We confirm the requirements for your municipality and scope before starting work.
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Focus Handyman serves the greater Kansas City metro, including Overland Park, Leawood, Lenexa, Shawnee, Olathe, Lee’s Summit, Blue Springs, Belton, Raymore, Liberty, Gladstone, and surrounding areas.
Focus Handyman is an insured handyman company serving Kansas City homeowners, business owners, realtors, and property managers. Our technicians are W-2 employees — and every job is backed by our 3-year workmanship warranty.