Deck Building Cost in 2026: Prices by Size and Material
Deck Building Cost in 2026: Prices by Size and Material
Most homeowners who hire a pro pay somewhere between about $4,000 and $12,500 for a new deck, and the final number depends mainly on size, material and how high the deck sits off the ground. Published guides disagree because they measure different things: some count only a basic wood platform, others include stairs, railings and permits. Below you’ll find the ranges, the math behind them, and the line items that move a quote.
TL;DR
- National cost guides put a professionally built deck at roughly $4,100 to $12,500, with averages between about $7,500 and $8,200 depending on the guide and its year.
- Composite decking runs about $5 to $14 per square foot for material, and labor adds roughly $9 to $15 per square foot, so a 20x20 composite deck lands near $5,600 to $11,600 on those figures.
- Height, stairs, railings, permits and demolition of an old deck are where quotes diverge the most.
- Repairs are usually far cheaper than replacement: most repair jobs fall between $570 and $2,600.
Table of Contents
- What a deck costs: the national ranges
- Cost per square foot: how to do the math yourself
- Wood vs. composite: what you pay now and later
- What pushes a deck quote up or down
- DIY or hire a pro?
- Deck repair cost vs. building new
- Our perspective
- Find deck builders near you
- A budgeting checklist before you call
- FAQ
- Sources
What a deck costs: the national ranges
No single figure is “the” price. Here is what four widely read guides report, with their publication years, because deck prices have moved since some were written.
| Source | Typical range | Average |
|---|---|---|
| Bob Vila (2021) | $4,141 to $11,713 | $7,913 |
| Forbes Home (2022) | not stated here | about $7,500 |
| The Spruce (2024) | $4,348 to $12,482 | $8,159 |
Older numbers sit lower. If you are reading a 2021 average in late 2026, treat it as a floor rather than a quote. Lumber, composite boards and labor all cost more in many markets than they did then, so the upper half of these ranges is a safer planning zone for a new build.
Also notice what the averages hide. A 10x10 pressure-treated platform at ground level and a two-level composite deck with built-in seating are both “decks.” The first can come in under the low end; the second can pass the high end by a wide margin. That is why per-square-foot math is more useful than any average.
Cost per square foot: how to do the math yourself
The simplest way to sanity-check a bid is to split it into material and labor per square foot, then multiply by the deck’s area.
Decks.com (updated March 2026) reports that composite decking costs about $5 to $14 per square foot for material alone, and that labor adds roughly $9 to $15 per square foot on average. Put together, that is about $14 to $29 per square foot for a basic composite deck surface and installation.
Here is what that means for common sizes. These are our own calculations from those two figures, so they cover decking and basic labor, not stairs, railings or permits.
| Deck size | Area | Composite, material plus labor |
|---|---|---|
| 10x12 | 120 sq ft | $1,680 to $3,480 |
| 12x16 | 192 sq ft | $2,688 to $5,568 |
| 14x20 | 280 sq ft | $3,920 to $8,120 |
| 20x20 | 400 sq ft | $5,600 to $11,600 |
Some contractors quote all-in prices that are noticeably higher, since they fold in framing, footings, hardware, rails, stairs, overhead and profit. If a bid comes in well above these figures, ask for it broken down before deciding it is too high. If it comes in well below, ask what is missing.
Wood vs. composite: what you pay now and later
Pressure-treated lumber is the lowest-cost route up front. Composite costs more at purchase but skips most of the sanding, staining and sealing that wood needs.
Bob Vila’s composite guide cites Angi and HomeAdvisor figures of about $3,600 to $7,800 for a composite deck installation, with an average near $5,450. That is lower than some all-in contractor quotes, so expect variation by region and deck size.
When comparing, count more than the invoice:
- Upfront price. Wood wins. Composite typically costs more per board and sometimes needs more closely spaced framing, depending on the product.
- Upkeep. Wood needs periodic cleaning and sealing. Repair guides put sealing and staining at roughly $1.15 to $4.70 per square foot each time, so on a 300 sq ft deck that is about $345 to $1,410 per treatment.
- Lifespan. This varies by product, climate and care. Check the warranty terms on the specific board line rather than relying on general claims.
- Resale. Appeal varies by neighborhood, so ask a local agent before you spend extra for resale reasons alone.
One reasonable middle path is a pressure-treated frame with composite or PVC surface boards. The frame is hidden, so you save there, while the part you see and walk on needs less maintenance.
What pushes a deck quote up or down
Two decks of the same size can differ by thousands of dollars. These are the factors to ask about.
Height and structure
A deck close to the ground needs short posts and simple framing. A second-story deck needs taller posts, bracing, larger footings and often a more involved stair run. Cost climbs fast with height.
Stairs, railings and extras
Railings are often a major add-on, and they are also a safety item. Inspectors surveyed by the International Code Council most often flagged improper ledger connections and guardrail or handrail problems: 59% and 55% of respondents respectively. That is a good reason not to buy the cheapest railing system or the cheapest installer just to trim a line item.
Lighting, built-in benches, pergolas, privacy screens and skirting each add cost, and you can often add them later if the structure is built to allow it.
Site conditions
Sloped yards, poor drainage, rock, tight access for equipment and tree roots all add labor. So does tearing out an old deck: ask whether demolition and hauling are in the bid.
Permits and code rules
Most decks attached to a house need a permit. Even a deck that qualifies for an exemption, for example one that is small, low to the ground, freestanding and not serving a required exit door, still has to meet local building code. Rules differ by city and county, so call your building department before you sign anything.
The ICC suggests treating code officials as partners in planning rather than obstacles, since early contact helps you avoid redesigns that cost money. An unpermitted deck can also create problems with insurance claims and a future home sale.
If you live in a wildfire-prone area, check local requirements early. In wildland-urban interface zones, rules can call for fire-rated materials on attached structures such as decks, and an NAHB analysis notes this can push owners toward a concrete patio or a costlier fire-resistant deck.
DIY or hire a pro?
Labor is a large share of the bill. Using the Decks.com figures above, labor of $9 to $15 per square foot on a 20x20 deck comes to $3,600 to $6,000. That is the money you could keep by building it yourself.
What you give up in exchange:
- Tools, rentals and delivery that a contractor already owns or gets at a discount.
- Time. A first-time builder often needs several weekends.
- Inspection risk. The ledger, the connection between deck and house, is the most-flagged problem area, and a failure there is a safety hazard, not a cosmetic flaw.
A sensible compromise for many homeowners is to hire a pro for the structure (footings, framing, ledger) and handle staining or railing finishes yourself. For small jobs such as replacing a few boards, a handyman’s hourly rate may be all you need to budget.
Deck repair cost vs. building new
If your deck is sound but tired, repairing may cost a fraction of replacement. According to a 2026 cost guide, most repairs fall between $570 and $2,600, averaging $1,465, with minor fixes from $150 and major overhauls up to $6,670.
The same guide breaks it down per square foot:
| Repair type | Cost per sq ft |
|---|---|
| Replacing damaged boards | $10 to $35 |
| Resurfacing | $15 to $50 |
| Sealing and staining | $1.15 to $4.70 |
| Termite damage | $20 |
Repair stops making sense when the structure is compromised: rotted posts or joists, a loose or corroded ledger, or footings that have heaved. Paying to resurface a frame that fails is money wasted. Have a pro inspect the framing before you decide.
Our perspective
We see deck projects go wrong in one predictable way: homeowners compare two bids that do not describe the same deck. One includes footings, permit fees, stairs and haul-away; the other quotes boards and labor only. The cheaper one then grows through change orders.
Our advice is to ask every contractor to price the same written scope. List dimensions, height, decking and rail material, stair count, permit responsibility, demolition and cleanup. Then compare line by line, and confirm that the business is licensed where your state or city requires it. Our guide on what to verify before you hire walks through that check.
We also recommend getting at least three quotes from providers that actually work in your ZIP code. Crews that regularly work near you know the local permit office, soil and frost depth, and typical lead times, and that knowledge saves money.
— Service
Find deck builders near you
On Best Service Local you can search by service type and ZIP code, open verified business profiles and compare providers side by side before you ask anyone for a quote. Browsing and searching are free for homeowners. If you are starting with a smaller job, such as board replacement or railing fixes, local handyman businesses like Accurate Home Repair are listed too.
A budgeting checklist before you call
- Measure and sketch. Length, width and height from grade. Note any stairs and where the deck meets the house.
- Choose a material tier. Pressure-treated, composite or hybrid. Ask for one price for each so you can see the gap.
- Call your building department. Ask about permits, inspections, setbacks and fees.
- Request three itemized quotes. Same scope, same material, same railing.
- Ask about timing. Spring and early summer are busy in much of the country, so scheduling off-peak may help with price and availability.
- Keep a contingency. Setting aside 10% to 15% for surprises is a common rule of thumb among builders; treat it as a planning habit, not a quote.
- Think about the rest of the house. A new deck often exposes other work: siding repair near the ledger, or gutter installation so runoff does not soak the deck’s framing.
FAQ
How much does a 20x20 deck cost?
On the Decks.com composite figures of $14 to $29 per square foot for material plus labor, a 400 sq ft deck comes to about $5,600 to $11,600 before stairs, railings and permits. Contractor all-in quotes can run higher. Get itemized bids to see which items are included.
Is composite worth the extra cost?
It can be if you dislike annual upkeep, since wood typically needs regular cleaning and sealing. The higher purchase price is the trade-off. Compare warranty terms on the specific product, because they differ by manufacturer.
Do I need a permit to build a deck?
Usually yes if the deck is attached to the house, raised well off the ground or large. Some small, low, freestanding decks are exempt from a permit but still must meet code. Call your local building department, because rules vary by jurisdiction.
Is it cheaper to repair or replace a deck?
Repair is usually cheaper when the framing is solid: most repairs run $570 to $2,600. If posts, joists or the ledger are rotted or loose, replacement of the affected structure is the safer choice, and a qualified builder should inspect it first.
Sources
- Bob Vila: How Much Does It Cost to Build a Deck?
- Forbes Home: How Much Does It Cost To Build A Deck?
- The Spruce: How Much Does It Really Cost to Build a Deck?
- Decks.com: Composite Decking Price Comparison
- Bob Vila: Composite Decking Cost
- Lawn Love: How Much Does Deck Repair Cost in 2026?
- ICC: 2019 Common Code Noncompliance Report
- ICC: Deck Construction Based on 2018 IRC
- ICC: Permit Process brochure
- NAHB: Cost Impact of Building a House in Compliance with IWUIC