Composite vs. Wood Decking

The three decking materials most people choose between

Almost every new deck in the US is built from one of three things. Pressure-treated pine is southern yellow pine or a similar softwood forced full of preservative. It is the cheapest board in the yard and the standard for framing. Cedar (and its cousin redwood) resists rot naturally, smells and looks better, and costs more. Composite is a mix of wood fiber and plastic. Nearly all of it now comes "capped," with a hard plastic shell that resists stains and fading. PVC boards are the all-plastic version, at the top of the price range.

One thing surprises many buyers: a composite deck is not a plastic deck. The boards are composite, but the posts, beams and joists underneath are still pressure-treated lumber. That matters for both cost and lifespan, and we come back to it below.

Installed prices and wood lifespans: HomeGuide, February 2026, for average attached decks on one-story homes. Composite lifespan is the range of manufacturer warranties.

What each deck costs to build

Take the default deck in our deck calculator: 16 ft along the house, 12 ft out, 3 ft off the ground, with railing and stairs. That is 192 square feet. At the midpoint of HomeGuide's installed ranges, it costs about $7,200 in pressure-treated pine ($37.50 per sq ft) and about $11,520 in composite ($60 per sq ft). Composite adds roughly $4,300.

If you build it yourself, the gap is smaller in dollars but bigger in percent. The calculator puts the treated version at about $2,600 in lumber, hardware and concrete. Switching to composite boards takes the decking alone from under $600 to about $1,300, and a composite or aluminum railing kit costs several times more than a site-built wood rail. The framing, footings and hardware cost the same either way.

Composite can also change the framing. Most composite boards want joists 16 inches on center when laid straight and 12 inches when laid on a diagonal, and some lighter lines call for 12 inches even when straight. Closer joists mean more lumber and hangers. Check the install guide of the exact board before you order framing.

The 25-year cost, with the math

The sticker price is only the first bill. To compare fairly, we added up everything you would pay over 25 years for the same 192 sq ft deck: the build, the upkeep, and a replacement if the boards wear out first. All figures are in today's dollars, without inflation, so the comparison isn't tilted by a guess about future prices.

The assumptions

• Build: $37.50 per sq ft for treated pine and $60 for composite, the middle of HomeGuide's installed ranges.
• Wood upkeep: clean and stain every 2 years. The Southern Forest Products Association says to renew a water repellent every year or two. A pro charges $1.50 to $4.00 per sq ft to stain a deck; we used $2.75, or $528 per round. Doing it yourself, we estimate about $150 per round for deck cleaner and two to three gallons of semi-transparent stain. Behr rates its semi-transparent stain at 250 to 300 sq ft per gallon for the first coat and 500 to 600 for the second, so the deck floor alone takes about a gallon; railings and stairs add the rest. The $150 is our estimate, not a quoted price.
• Wood replacement: HomeGuide gives wood decks 10 to 25 years and prices a deck replacement at $30 to $55 per sq ft. At the $42.50 midpoint, replacing this deck costs $8,160.
• Composite upkeep: soap, water and a soft brush. Trex estimates about $20 a year for cleaning, so we used $500 over 25 years.
• Not counted: repairs both decks need (a loose rail, a popped screw), and the yearly structural check you should do on any deck.

The four scenarios

1. Wood, you stain it, it lasts 25 years. $7,200 + 12 rounds × $150 = $9,000.
2. Wood, a pro stains it, it lasts 25 years. $7,200 + 12 rounds × $528 = $13,536.
3. Wood, a pro stains it, replaced at year 15. $7,200 + 7 rounds × $528 ($3,696) before the replacement + $8,160 to replace + 4 more rounds × $528 ($2,112) = $21,168. The second deck still has some life left at year 25, but you paid for all of it.
4. Composite. $11,520 + $500 of cleaning = $12,020, with no replacement inside the warranty.

What the numbers say

The deciding question isn't "wood or composite." It's "who holds the brush, and how long will the wood last where you live?" If you are willing to wash and stain a deck every other spring, and your climate is kind to wood, pressure-treated pine is still the cheapest deck you can own, by about $3,000 on this size. If you would hire that work out, the $528 rounds pass the composite premium, plus its cleaning, after about 18 years. And if the wood boards fail early, as they do in wet, shady yards, composite comes out thousands ahead.

Two cautions. First, many owners skip staining altogether. That makes wood look cheap on paper, but bare boards gray, check and splinter, and the deck reaches the replacement scenario sooner. Second, these are midpoints. A deck at the top of the composite range ($80 per sq ft) costs $15,360 to build, which flips the result against composite unless the wood is replaced. Run your own size and prices through the deck calculator, then plug them into the same four lines.

The frame decides how long any deck lasts

A composite board with a 50-year warranty does you no good on top of a frame that rots at year 20. Under both decks the joists, beams and posts are pressure-treated lumber, and the ledger where the deck meets the house is the classic failure point. Even Trex, which sells composite, lists ledger rot and rotting joists among the common ways decks fail.

If you choose composite to "build it once," spend a little more on the frame to match:

• Use lumber rated for ground contact for joists, beams and posts, not just "above ground."
• Put butyl joist tape on the tops of joists and beams. Water sits in screw holes under the boards, and tape keeps it out of the wood.
• Flash the ledger and bolt it with lag screws or through-bolts, as the American Wood Council's DCA 6 guide shows. Never nail a ledger.
• Buy hangers and screws rated for treated lumber (hot-dip galvanized or stainless). Modern treated wood corrodes plain zinc.
• Leave room for air. Low decks with no airflow under them stay damp and rot first.

Replacing old boards on a sound frame is also how many people get composite for less. If the frame of your current deck passes inspection, re-decking with composite costs a fraction of a new deck. A contractor or inspector should check the ledger, posts and footings before you commit.

Pros and cons, honestly

Pressure-treated wood

• Pros: the lowest price, sold everywhere, easy to cut and fasten with ordinary tools, and you can sand, repair or re-stain it to change the look.
• Cons: it checks, splits, warps and splinters as it weathers; it needs regular cleaning and stain; boards often arrive wet and shrink after they go down.

Cedar and redwood

• Pros: naturally rot-resistant without chemical treatment, stable, takes stain well, and the best-looking of the softwoods.
• Cons: soft enough that chair legs and dog claws dent it; needs sealing about every year to keep its color; costs more than treated pine. It is rarely used for framing.

Composite

• Pros: no staining or sealing, no splinters, consistent color, and long warranties. Trex, for example, lists 25 years for its entry line, 35 for the middle and 50 for its top boards.
• Cons: the highest price; it can't be sanded out or re-stained if it scratches or fades; darker colors get hot in full sun; and it needs the joist spacing, gaps and fasteners its maker specifies or the warranty is void.

Resale value

Decks are among the best-returning projects in the annual Cost vs. Value report. In the 2025 national figures, a wood deck addition cost an average of $18,263 and added $17,323 at resale, recouping 94.9%. A composite deck addition cost $25,096 and added $22,199, recouping 88.5%. Buyers pay for a deck, but they don't pay much extra for composite.

If you plan to sell within five years, that tilts the answer toward wood. A fresh, well-stained wood deck shows almost as well as composite. If you plan to stay 15 years or more, the upkeep math above matters more than resale.

Common mistakes

• Staining new treated wood too soon. Wet treated lumber needs to dry first. Sprinkle water on it: if it beads, wait; if it soaks in, it's ready. The Southern Forest Products Association suggests waiting about 30 days for an oil-based semi-transparent stain and longer for solid stains and paint.
• Using paint or solid stain on the walking surface. They wear through in traffic lanes and peel. Semi-transparent stain wears more evenly and is easier to renew.
• Butting composite boards tight. Composite expands and contracts with temperature. Follow the maker's end and side gaps for the temperature on install day.
• Pressure-washing too hard. A narrow, high-pressure tip furs up wood fibers and can scar composite caps. Use a wide fan tip at low pressure, or the brush the maker recommends.
• Putting new boards on a tired frame. Probe the ledger, joist ends and post bases with a screwdriver. Soft wood there means a structural repair first.

When to call a pro

Choosing the boards is a homeowner's decision. The structure is different. Most towns require a permit and a drawing for an attached deck, plus a footing inspection before you pour. Bring in a deck builder or engineer when the deck is higher than about 8 feet, sits on a slope or poor soil, will carry a hot tub, or attaches to brick, stone veneer or a cantilevered floor where a ledger can't bolt to a solid rim joist. The concrete calculator will size the footing concrete, and if the deck project includes new railings or a privacy screen, the fence calculator and the exterior paint calculator cover the posts and the stain or paint.

Common questions

Sources

• HomeGuide, Cost to build a deck, February 10, 2026: installed cost by material, replacement cost ($30 – $55 per sq ft), staining cost ($1.50 – $4.00 per sq ft) and wood vs. composite lifespans.
• Cost vs. Value 2025, national averages (Zonda / Journal of Light Construction): wood and composite deck addition job cost, resale value and percent recouped.
• Southern Forest Products Association, Finishing, maintenance and inspection: water repellent every year or two, drying times before staining, the water-drop test and yearly inspection.
• Trex, How long does a deck last?: warranty terms by product line (25, 35 and 50 years), cleaning cost estimate and common failure points. A manufacturer source, used here only for its own warranties and cleaning estimate.
• American Wood Council, DCA 6 Prescriptive Residential Wood Deck Construction Guide: ledger attachment, fasteners and framing.
• Deck size, material list and DIY material prices: the HomeOutlay deck calculator, with Menards prices checked in October 2026. The $150 do-it-yourself staining cost is a HomeOutlay estimate; stain coverage is from Behr's semi-transparent waterproofing stain product page (checked November 1, 2026), cited as a reference, not a recommendation.

Figures are US national averages checked in October 2026. Prices vary a lot by region, so get local quotes before you decide.