Trew Landscape Blog
Deck Replacement: When to Rebuild, What It Costs, How It Works
Deck replacement explained for Kansas City homeowners: signs your old deck is past repair, 2026 cost ranges, wood vs. composite, permits, and the steps.
Replace a deck when the structure is failing, not just the surface. Soft posts, a sagging or twisted frame, stairs that shift, and a ledger that is nailed to the house are replacement problems. Worn, gray or loose boards on a sound frame are usually a repair or a resurfacing job. Nationally, a full replacement averages around $11,000, and a 20-by-20-foot deck often lands between $16,000 and $24,000, depending on material and site conditions.
This guide helps you tell which situation you are in, what drives the price, how wood and composite compare, which rules apply, and what happens from demolition day to the final inspection.
TL;DR
- Repair when the frame is sound. Replace when posts, joists, stairs or the ledger connection are compromised, or when rot is widespread.
- Nationally, replacement averages about $11,000, with a range of $4,000 to $19,000. A 400-square-foot deck usually costs $16,000 to $24,000 or more.
- If the frame passes inspection, replacing only the decking and railings (refacing) skips full demolition and saves money.
- Even a deck exempt from a permit must meet code. Check requirements with your city or county before work starts.
Table of Contents
- Repair or replace: how to decide
- What deck replacement costs
- Wood or composite: which to put back
- Ways to lower the cost without cutting safety
- Permits and code for a replacement deck
- How a deck replacement works, step by step
- Our perspective on replacing old decks
- Plan your replacement with Trew Landscape
- FAQ
- Sources
Repair or replace: how to decide
Start under the deck, not on top of it. Boards are cosmetic and cheap to swap. The frame is what keeps people safe.
Signs the structure is done
Reported structural red flags include unstable posts, stairs that shift or separate from the deck, and framing that sags or twists. Add these checks:
- Probe the wood. Push a screwdriver into joists, beam ends and post bases. If it sinks in easily, the wood has rot.
- Look at the ledger. This is the board that ties the deck to your house. Flashing that is missing, stained or rusted is a warning.
- Shake the posts and railing. Movement you can feel with your hands is movement a crowd of guests will exceed.
- Check fasteners and joist ends. Water collects around fasteners, joist ends, stair connections and the ledger area, and damage there often stays hidden until boards come up. A professional inspection can find it.
- Count the problem areas. One rotted board is a repair. Rot or insect damage spread through several areas, plus age and boards that no longer hold stain, points toward replacement.
The ledger is the safety check that matters most
A deck pulling away from a house is one of the more serious deck failures. The American Wood Council states that a ledger attached solely with nails is potentially dangerous, that its use should be forbidden, and that it should be repaired or replaced on a qualified professional’s recommendation. It also notes that since 2009 the International Residential Code has required ledgers to be secured with bolts or lag screws, not nails alone. If your older deck was built before then and you cannot see how the ledger is attached, have a qualified builder look at it before anyone uses the deck heavily.
When repair still makes sense
If posts are solid, the frame is level, and the problem is a handful of boards, a loose rail or a weathered finish, repair costs far less. In a Kansas City climate, with hard freezes, humid summers and the occasional hail season, a sound frame can often take new surface boards and last another decade or more. Replace the deck when you would otherwise be paying repeatedly to patch something that is failing underneath.
What deck replacement costs
No honest number exists without measuring your deck, but national figures give a useful range. Forbes Home reported in 2023 that replacement averages $11,000, within a $4,000 to $19,000 range, including building the new deck, demolishing the old one and reassessing the land. Prices have moved since then, so treat these as a starting frame, not a quote.
Cost per square foot
NerdWallet puts professionally built decks at $30 to $60 per square foot. Bob Vila says replacing a deck at the same footprint runs about $20 to $62 per square foot for materials, with $6,000 to $18,600 overall, and that enlarging costs more. For Kansas City-specific numbers, see our deck cost per square foot guide.
A 20-by-20-foot deck
A 20-by-20 deck is 400 square feet. Here is what the published sources imply:
| Source | Basis | Estimate for 400 sq ft |
|---|---|---|
| Forbes Home | Size table | About $18,000 |
| NerdWallet | $30 to $60 per sq ft | About $16,000 to $24,000 |
Those figures assume a standard build. Demolition, permits, access for equipment, stairs, railings, height above grade and your material choice can all move the final number up or down.
What changes the price most
- Material. Wood, composite, PVC and metal decking all price differently (see the next section).
- Demolition and haul-off. Removing a big old deck, footings included, is real labor.
- Height and stairs. A deck 8 feet off a walkout basement grade needs more posts, bracing, railings and stairs than a ground-level platform.
- Railings. Style matters; our deck railing styles guide shows how view, budget and code interact.
- Site problems. Poor drainage, expansive clay and tight access all add cost. Kansas City’s clay soils are a reason footing depth and drainage deserve attention in the plan.
- Size and shape. Curves, multiple levels and built-in benches cost more per square foot than a simple rectangle.
Wood or composite: which to put back
The material decision shapes both your budget and the next decade of weekends.
| Wood | Composite | |
|---|---|---|
| Replacement material cost | About $20 to $50 per sq ft | About $30 to $50 per sq ft |
| Upkeep | Periodic washing and restaining | Mostly washing |
| Upfront cost | Lower | Higher |
The material ranges come from Forbes Home’s 2023 figures, which also list PVC at roughly $24 to $50 and metal at $20 to $35 per square foot, with labor alone around $8 to $22 per square foot. NerdWallet’s separate estimate for wood materials alone is lower, $3 to $20 per square foot before labor, and it cites restaining every two to three years for wood.
How to choose:
- Choose wood if you want the lowest upfront price, like the look of natural boards and accept regular finishing.
- Choose composite or PVC if you would rather spend more now and less time on upkeep, especially on a large deck where annual staining is a big chore.
- Think about the frame either way. Decking can only last as long as what supports it. A premium surface on a tired frame wastes money.
Durability depends on material, climate, construction quality and maintenance, so any lifespan promise is a guideline, not a guarantee.
Ways to lower the cost without cutting safety
Savings are real, but they come from scope and design, never from skipping structure.
- Reface instead of rebuild. If the frame passes inspection, you can replace the decking, railings and stairs without demolishing the structure. If it does not pass, the entire unsafe structure should be rebuilt. Never reface over framing you have not checked.
- Keep the footprint. Bob Vila’s figures show that enlarging a deck costs more than replacing it at the same size.
- Simplify the shape. One rectangle with one set of stairs is cheaper than a multilevel design.
- Pick a simpler railing. Railing can be a surprisingly large line item. Choose a style that meets code and fits your budget.
- Mix materials where it helps. Some homeowners use durable surface boards where traffic is heavy and keep the rest simple.
- Get the scope in writing. Demolition, haul-off, permits, footings and stairs should each appear as a line item, so quotes compare fairly.
What we would not cut: footing depth, ledger fasteners and flashing, joist hangers and the permit. Those are the parts you cannot see once the deck is done.
Permits and code for a replacement deck
Missouri has no single statewide residential code, so the rules come from your city or county. The Kansas City area spans several jurisdictions (Kansas City, North Kansas City, and Clay, Jackson and Johnson counties among them), and each may have its own process. Call your local building department before you sign a contract, and ask whether a like-for-like replacement needs a permit.
The model code gives a baseline. Under the 2021 IRC, the permit exemption covers decks that are no more than 200 square feet, no higher than 30 inches above grade, not attached to a dwelling and not serving a required exit door. Most replacement decks are attached to the house, so most fall outside that exemption. The ICC also makes clear that a deck exempt from a permit must still meet the applicable code for safety and construction.
If you are planning to put a deck over an existing slab, read our code-backed guide to decks over concrete patios first, because trapped moisture is a common cause of early rot.
How a deck replacement works, step by step
Steps vary by project, but a typical sequence runs like this, based on common professional process outlines:
- Inspect and plan. The existing structure is assessed, and the design, materials and budget are set.
- Pull permits. Any required permits are obtained before demolition.
- Remove the old deck. Decking, railings and stairs come off first. The framing follows if it is being replaced.
- Clear debris and reassess the site. With the deck gone, drainage, grade and house connection points can be seen clearly.
- Set footings and frame. New or repaired footings go in, then posts, beams, the ledger and joists.
- Install decking, stairs and railings.
- Finish and inspect. Finishes are applied, and the work is inspected where required.
Deck planning often leads to other questions. If you are adding a patio below, deck and patio combos are worth a look. If a lift-and-slide door is part of the project, this overview of lift-and-slide patio doors explains how they work. If you want shade, our covered deck ideas cover costs and permits.
Our perspective on replacing old decks
We are a locally owned Kansas City company, and we build decks as part of a wider outdoor living practice that includes hardscaping, lighting and drainage. That mix shapes how we look at a replacement.
First, we look at the ground before the boards. Many decks fail early because water has nowhere to go: a downspout dumping at a post base, a grade that slopes toward the house, or a slab underneath that holds moisture. Sometimes the right fix includes drain tile or regrading, not only new lumber.
Second, we think homeowners should see the whole plan before committing: demolition, framing, surface, railings, stairs, lighting and permits. Transparent communication is something clients tell us they value, and a written scope is how we keep that promise.
Third, we would rather tell you to repair a sound deck than sell you a new one. If the frame is good, a refacing project is often the smart move. If it is not, no surface material will fix it.
— Trew Landscape LLC
Plan your replacement with Trew Landscape
If your deck has shown any of the structural signs above, or you simply want an honest assessment of whether it is worth saving, our team can look at the frame, discuss wood and composite options, and give you a clear scope. See our deck installation services or contact us through our site to start a conversation about your project in Kansas City and the surrounding counties.
FAQ
How much should it cost to replace a deck?
Nationally, replacement averages about $11,000, within a $4,000 to $19,000 range. Size, material, height, railings and demolition decide where you land. A written quote based on a site visit is the only reliable number.
How much does it cost to replace a 20-by-20 deck?
That is 400 square feet. Published estimates imply roughly $16,000 to $24,000 at NerdWallet’s per-square-foot range, and about $18,000 in Forbes’ size table. Complex stairs, height or premium materials can push it higher.
Is it cheaper to repair or replace a deck?
Repair is usually cheaper when the structure is sound. When posts, joists, stairs or the ledger are compromised, repair only delays the inevitable and can cost more over time. Inspecting the frame first tells you which path applies.
What is the cheapest safe way to replace a deck?
If the frame passes inspection, refacing with new decking and railings avoids full demolition. Keeping the same footprint and a simple shape also holds costs down. Do not economize on footings, ledger connections or permits.
Do I need a permit to replace a deck?
Usually yes if the deck is attached to your house, though rules differ by city and county. The 2021 IRC exempts only small, low, freestanding decks that are not an exit. Ask your local building department before work begins.
Sources
- How Much Does Deck Repair Or Replacement Cost? – Forbes Home
- The Cost to Build a Deck in 2026 – NerdWallet
- Deck Repair Costs: A Homeowner Budgeting Guide – Bob Vila
- Deck replacement decisions rise as homeowners weigh repairs – KIRO 7
- Deck Construction Based on the IRC – International Code Council
- Is Your Deck Safely Connected to Your House? – American Wood Council
- Lift-and-slide patio doors