Willem Warmbold
Natural wood deck vs composite on real numbers: build cost, 25-year upkeep, warranty fine print, and resale ROI. See which costs less.
A natural wood deck costs less to build than composite, but whether it costs less to own depends almost entirely on which wood you pick and who does the upkeep. Build the same deck twice and the national averages come out around $18,300 in wood and $25,100 in composite. Composite spends the next two decades trying to close that $6,800 gap on lower maintenance, and against a cheap softwood it usually does. Against a naturally durable hardwood, it usually doesn't.
We're Black Locust Lumber, a second-generation family sawmill and lumber supplier in Pennsylvania that mills everything we sell. Sourcing, sawmilling, and finished decking all happen under our own roof, so the number we quote is a real price on real boards with a real lead time, not a markup on somebody else's inventory. More than 25 years of that, all in one species. So which one is the cheaper buy? The answer: it depends. We’ll tell you what you need to know before committing to one over the other.
Here's the whole comparison in one spot. Installed figures cover a complete deck, meaning framing, footings, surface, and labor, and the natural wood deck column spans budget softwood through premium hardwood.
Installed costs for a complete wood deck land roughly here in current pricing:
Watch the scope on any number you're shown. Some published figures price only the decking surface, others price the entire structure including framing and footings, and the gap between those two is enormous. A "wood is $5 per square foot" claim next to a "composite is $40 per square foot" claim is comparing boards to buildings, and it's the single most common way these comparisons go wrong. When you collect quotes, make every one of them cover the same scope before you line them up.
Species is the biggest lever on the wood side, and it swings the total more than deck size does. Our side-by-side decking comparison scores five materials across seven criteria if you want the specs behind the prices.
Trex's own cost guide at Decks.com puts composite here:
Those are the composite industry's own numbers, not ours. They also land close to the wood figures above, which is exactly why per square foot is the wrong unit for this comparison.
The national project figure is the cleaner comparison, because it holds the deck design constant instead of leaving scope up to whoever wrote the estimate. In the most recent Cost vs. Value Report, the same 16 by 20 foot deck addition cost $18,263 in wood and $25,096 in composite. That's a $6,833 premium on day one, before anybody has cleaned or stained anything.
One caution on capped versus uncapped pricing: nobody publishes a reliable dollar difference between the two, including Trex's own guide, which lists capping as a price factor without pricing it. Treat any specific figure you're quoted for that upgrade as a single contractor's pricing rather than a market rate.
This is the part almost every comparison misses, and it's hiding underneath the deck where nobody looks.
Start with the joists, the beams that run underneath and hold your deck boards up. How far apart they sit is called joist spacing, and it changes depending on what you lay on top.
With wood, the spacing rules are published up front and the same for everybody. The American Wood Council's deck construction guide allows joists 12, 16, or 24 inches apart, and lets you run boards on a diagonal for looks without moving those joists closer together.
Composite is different, because every board gets tested and carries its own spacing requirement, and those come back tighter. One current ICC-ES evaluation report covers 21 composite boards and requires joists no more than 16 inches apart for all of them, with stair treads at 11 inches. Lay them diagonally or build commercial and it usually tightens again, often to 12 inches. Each product is rated on its own, so ask for the report on the exact board you've been quoted.
Now count the joists, because this is where the money is. Tightening from 24 inches to 16 means roughly 50% more of them, and 12 inches means about twice as many. Every one is another piece of lumber, another metal hanger, and more framing labor, all on the composite side of the quote. In 25 years of milling decking, we've almost never seen a price sheet mention it. So if you're pricing a rooftop, a boardwalk, or any commercial job, ask what joist spacing each quote assumes before you compare totals.
Wood upkeep is real, and we won't pretend otherwise. The only question is what it costs, and that turns less on the species than on whether you want a finish at all.
The schedule comes from the product, not the wood underneath it. The USDA Forest Products Laboratory's finish guidance puts a clear water repellent at one to two years, a tinted one at two to three, and a semitransparent stain at three to eight. A deck takes sun and rain flat on, so plan on the short end of every range.
Each round runs about $0.50 to $1.00 per square foot yourself, or roughly $1.57 to $4.04 hired out with a power wash included. Repeat every three years for 25 years and you've spent around $4 to $8 per square foot on materials, or $13 to $32 paying a crew.
Set that against composite's $6,833 head start and the gap closes fast. On a 320 square foot deck, hiring out the refinishing for 25 years lands in the same neighborhood as the composite premium, and doing it yourself costs a fraction of that.
Then there's the option that takes the column to zero. A short list of naturally durable woods, black locust among them, need a finish only to hold their color, not to survive. That's why we tell almost every black locust customer to skip the oil and let the boards weather to their silvery gray. Sealing adds no years to the wood, so a schedule buys you work and nothing else, and our 50-year warranty says as much in writing: no oil or sealer required, and the graying is not a defect.
Like the patina and your refinishing budget is zero. Want the honey tones held and you're on a schedule like everyone else, which we'd rather tell you now than have you learn in year two.
Composite is lower maintenance than wood, but it isn't maintenance free.
The warranties are the proof. One major composite warranty excludes mold and mildew staining "that is not properly cleaned within one week of first appearance." Read that as a chore list. It assumes somebody is checking the deck and washing it weekly, which is more attention than most wood decks ever get.
There's a reason that clause exists. Composite boards are part plastic and part sawdust, and the sawdust is what mold feeds on. A 2024 USDA Forest Products Laboratory report covering 20 years of outdoor testing found mold and staining starting in the first year, and it traces how wet-and-dry cycles swell those wood particles until they open hairline cracks in the plastic, letting rot reach the wood sealed inside.
Budget for cleaning either way. What differs is what happens when the surface wears out. A tired composite board gets replaced, because you can't refinish it. Wood you can sand back to fresh, or swap one board at a time, and with black locust there's no finish to keep up in the first place.
A 25 or 30 year composite warranty sounds like it settles the cost argument. But get into the details and it settles less than you'd think.
Composite coverage arrives in pieces: one warranty for the structure, separate ones for staining and fading, each with its own term and exclusions. These warranties also often pay on a sliding scale, covering 100% of the boards early on and 10% by years 22 through 25. Also: it only ever covers boards. Tearing a deck apart and putting it back down is on you, and that labor is usually the bigger half of the bill. Mold left uncleaned is excluded. So is normal weathering.
Fade coverage surprises people most. A claim is judged against a set color-change number, not against what you can see, so a manufacturer can agree in writing that your boards changed color and still owe you nothing. That lands in year 15, when a replacement board has no obligation to match the deck around it.
A wood warranty reads differently. Ours runs 50 years above ground and drops to 25 for ground contact and marine use, because soil moisture that never lets up is hard on every wood. Black locust needs no oil or sealer, and the silvering isn't a defect. Whatever you're comparing, read the exclusions and the sliding scale before you weigh the headline number.
Years of service drive cost per year more than anything else on this page, and the composite number in circulation is softer than it looks.
The 25 to 30 years you see quoted for composite traces back to warranty length, not to anything measured outdoors. The FPL report above left composite boards in the weather and scored their condition on a 10-point scale, where 10 means sound. After 18 years above ground in Wisconsin, they scored 3.6 to 4.3. After 17 years in ground contact in Mississippi, 6.1 to 7.4. FPL found the damage takes one to seven years to get started, depending on the board and the exposure. Composite has also failed early at scale before: the CPSC recorded a recall of 48 million linear feet of composite decking for boards deteriorating and breaking, tied to 37 reports and 14 injuries.
On the wood side, the answer splits hard by species. Treated pine typically gives 10 to 20 years and cedar 15 to 25. Naturally durable hardwoods are a different category: the USDA Wood Handbook puts black locust and ipe in the top decay-resistance class, and with black locust that resistance lives in the heartwood instead of a coating, so it can't wear off or wash away. Our boards went into the Coney Island Boardwalk in 2016 and are still in service after a decade of salt air and heavy public traffic, with nobody out there sealing them.
So divide any quote by the years you expect to get, not by square footage. A natural wood deck built from a top-class species spreads its cost over 40 or 50 years. The composite quote beside it spreads over half that.
Both materials give most of your money back when you sell, and wood gives back a larger share of it. The Cost vs. Value data puts a wood deck at 94.9% of its cost recovered nationally, against 88.5% for composite.
In dollars that means the wood deck costs $18,263 and returns about $17,300, so roughly $900 never comes back. The composite deck costs $25,096 and returns about $22,200, leaving roughly $2,900 behind. Composite recovers more dollars only because it cost more to start with, and the extra you don't recover works out to about $2,000. If you're weighing this as an investment rather than a lifestyle purchase, that's the number to keep, and it sits on top of everything the earlier sections covered on upkeep and years of service.
We sell black locust lumber, and there are still cases where we'd tell you to buy composite.
Buy composite when nobody will maintain the deck. A rental the owner never visits, a property manager juggling forty units, or someone who knows they'll never pick up a brush is better served by a material that doesn't punish neglect as fast.
Buy composite when the alternative is cheap softwood. Over 25 years, composite often comes out ahead against treated pine once you count sealing, board swaps, and a likely full replacement. The composite premium is real, but so is replacing a whole pine deck around year 18. We break down how treated pine and black locust diverge year by year if pine is the other quote on your desk.
Buy composite when the climate is punishing with no roof overhead, or when your budget can't reach a durable hardwood and you'd rather pay once than pay attention. That's a fair trade, and it's roughly how black locust and composite compare head to head on everything that isn't cost.
Where composite loses on money is against black locust and the other naturally durable hardwoods. You're paying extra up front to skip maintenance the wood never needed, and taking fewer years and a sliding-scale warranty in the bargain. Worth knowing, too: for all of composite's marketing, treated wood alone was 58% of US decking demand by volume in 2022. Composite looks bigger in dollars than in boards sold, which is what a price premium does.
If you're comparing a natural wood deck against composite on cost, the number that settles it is cost per year of service, and you can't work that out until you know which wood you're comparing.
That's a quicker conversation with people who handle the material every day. Send us the project, the climate it has to survive, and how long it needs to last, along with the composite quote if you have one, and we'll tell you straight whether black locust comes out ahead. Sometimes it doesn't, and we say so.
Tell us about your project and we'll price the same deck honestly, freight included, then stay with it from the spec through delivery.
Often not without work, and it's the expensive surprise in most re-decking jobs. Wood frames are frequently built with joists 24 inches apart, and most composite boards won't be approved on that spacing, so the fix is adding joists between the existing ones or framing again from scratch. Either can cost more than the boards. Measure your spacing first, because it decides which materials are even on the table.
Demolition and haul-away usually runs a few dollars per square foot either way. The difference is what happens to the debris. Wood is already part of construction recycling and can be chipped or composted, and untreated black locust breaks down on its own because nothing was added to it. Composite mixes plastic and wood, isn't tracked separately in federal recycling data, and leaves thin options for weathered boards. Ask your contractor where the old deck ends up.
Sometimes, and the terms vary more than people expect. Some transfer once within a set window after the original purchase, some don't transfer at all, and the document tells you which. Transferability is part of what the premium bought you, so read that clause before you buy, not when the house is listed. Ask the same of any wood warranty, ours included.
Insurers rarely distinguish between them on a standard residential deck. Fire is where it changes: wildfire-prone areas, apartment buildings, and many commercial rooftops limit how fast a surface spreads flame, and the two materials answer that differently. Black locust carries a Class A fire rating, which is the documentation those reviews ask for. HOAs usually police appearance and railing style rather than material. Check both before you sign, since a rejected material is a total loss on the deposit.
On a rooftop, both usually lose to modular deck tiles set on pedestals, which lift the surface so water drains, air moves, and any tile can be pulled for inspection. Composite is heavier, wants tighter support up there, and holds more heat around a pool. Budget for a structural engineer either way, since what the roof can carry is what sets the price.
Continue Reading
Black Locust vs Honey Locust: Key Differences Explained
How Long Does a Wood Deck Last? 10 to 50 Years, by Species
Outdoor Flooring Options Compared by Cost and Lifespan
The Best Wood for Decks: A Guide to Outdoor Decking
