Composite vs Wood Decking: Which Lasts Longer? (2024)

TL;DR: Composite decking typically lasts 25-30 years with minimal maintenance, while pressure-treated wood decking lasts 10-15 years but costs roughly 40-50% less to install. If you plan to stay in the home more than a decade, composite usually wins on lifetime cost. If you're selling within 5-7 years or watching upfront cash, wood still makes sense.

_Last reviewed: July 2026 · 7 min read_

You're staring at a deck quote and the composite option costs thousands more than wood, and nobody's telling you which one actually pays off. The honest answer depends on how long you'll own the house and how much time you want to spend sealing, sanding, and replacing boards every few years.

Okoniq Property Hub tracks your deck's install date, material, and maintenance history so you know exactly when a re-seal or board swap is due, no guessing required.

How many years does composite decking actually last?

Composite decking, made from wood fibers bonded with recycled plastic, lasts 25 to 30 years under normal weather exposure. Manufacturers like Trex and TimberTech back this up with 25-year to 50-year limited warranties depending on the product line, though most of those warranties cover structural failure and fading, not accidental damage.

The material resists rot, insects, and moisture absorption because the plastic shell locks out water. It won't splinter or warp the way wood does after a few humid summers. The tradeoff shows up in year one: composite boards run $7 to $12 per square foot installed, compared to $5 to $8 for cedar or $3 to $5 for pressure-treated pine.

If you're also dealing with drainage issues near the deck footing, it's worth checking how downspouts might be dumping water in the wrong place, since standing water at the deck base accelerates wear on both material types.

How long does a wood deck last before it needs replacing?

Pressure-treated wood decking lasts 10 to 15 years with regular maintenance, and untreated cedar or redwood typically lasts 15 to 20 years if sealed annually. The chemical treatment in pressure-treated lumber protects against rot and insects for roughly a decade before the protection starts breaking down and boards begin to soften, especially near ground contact points.

Wood needs a fresh coat of sealant or stain every 1 to 2 years to hold that lifespan. Skip a season and you'll see graying, splintering, and moisture penetration that shortens the deck's life by years. Screws also loosen faster in wood as boards expand and contract with humidity, so an annual walk-through to re-tighten hardware matters.

The upfront savings are real. A 300-square-foot pressure-treated deck runs $1,500 to $2,400 installed, versus $3,000 to $4,500 for the same footprint in composite.

Which material actually costs less over 20 years?

Composite wins on 20-year total cost in most cases, once you factor in maintenance labor and replacement cycles. Here's the side-by-side for a 300-square-foot deck:

| | Pressure-Treated Wood | Composite | |---|---|---| | Install cost | $1,500-$2,400 | $3,000-$4,500 | | Annual maintenance | $150-$300 (sealing/staining) | $0-$50 (occasional wash) | | Expected lifespan | 10-15 years | 25-30 years | | Replacements in 20 years | 1-2 | 0 | | 20-year total | $6,000-$9,000 | $3,500-$5,000 |

Wood only comes out ahead if you sell the property within 7-8 years, since you won't be around for the second install cycle or the accumulated maintenance costs. Landlords holding a property long-term almost always come out ahead with composite once you run the full 20-year math.

What maintenance does each material actually require?

Wood needs annual sealing, periodic sanding, and inspection for soft or rotted boards, while composite mostly needs an occasional soap-and-water wash. Plan on resealing wood every 12-24 months depending on sun exposure. Southern and desert climates with intense UV push that closer to annual. You'll also want to check fasteners twice a year since wood movement backs out screws over time.

Composite needs far less. A pressure wash or soap scrub twice a year keeps mildew and pollen film off the surface. The one thing composite owners overlook: some early-generation composite boards (pre-2010) were prone to mold in shaded, humid spots. Newer capped composite products largely solved this, but it's worth checking the manufacturer date if you're buying a resale home with an older composite deck already installed.

Either material benefits from keeping gutters and downspouts clear nearby, since chronic water exposure at deck posts and ledger boards is what causes structural failure years before the surface boards wear out. If you're noticing water pooling near the house foundation that could be feeding moisture toward the deck substructure, it's the same root cause covered in why water pools under a water heater, a drainage problem that shows up in multiple parts of a home.

Is there a hybrid option worth considering?

Yes, PVC decking is a third option that outlasts both wood and traditional composite, running 30+ years since it's 100% synthetic with no wood fiber to absorb moisture. It costs more than composite, typically $9 to $15 per square foot, and some owners find the surface texture less natural-looking than capped composite. For owner-operators renting out a property, PVC's near-zero maintenance can be worth the premium since tenants rarely handle deck upkeep the way an owner would.

FAQ

Does composite decking get hot in direct sun?

Yes, composite decking can reach 30-40 degrees hotter than the surrounding air temperature in direct sun, more than natural wood, because the plastic content absorbs and retains heat. Lighter-colored composite boards run cooler than dark brown or gray finishes.

Can you install composite decking over an existing wood frame?

Yes, composite boards attach to standard wood joists and framing the same way traditional decking does, as long as the substructure is structurally sound and spaced correctly for the composite manufacturer's span requirements, usually 16 inches on center.

Is composite decking worth it for a rental property?

For a rental you plan to hold more than 10 years, composite usually pays off since it eliminates annual staining labor and reduces tenant complaints about splinters or rough boards. For a shorter hold or a lower-rent property, pressure-treated wood keeps upfront costs down.

Does composite decking fade over time?

Most composite boards fade slightly in the first 6 to 12 months as UV exposure sets the final color, then hold that color for the rest of the warranty period. Manufacturer warranties typically cover fading beyond a certain percentage, usually 10-15%, within the first few years.

How do I know if my current deck needs replacing versus repair?

Check for soft spots when pressing a screwdriver into the wood, visible rot at ground-contact posts, and more than 20% of boards showing significant cracking or warping. If the frame and posts are solid but surface boards are worn, resurfacing with new boards over the existing structure is often cheaper than a full rebuild.

This is educational information, not construction or engineering advice. Consult a licensed contractor to assess your specific deck's structural condition before deciding between repair and replacement.