The average cost to install a composite deck runs between $25 and $50 per square foot, including materials and labor. For a standard 300-square-foot deck, that puts your total investment somewhere between $7,500 and $15,000. But those numbers alone don't tell you much. The real cost depends on your deck size, the type of composite you choose, where you live, and whether you're building from scratch or replacing an old wood deck.
We've helped thousands of homeowners plan their decking projects through Composite Deck Direct. In this guide, we'll break down every cost factor, share real pricing from our product lines, and give you a budgeting framework you can actually use. We'll also cover the mistakes we see buyers make most often, so you can avoid them.
Quick Reference: Composite Deck Cost at a Glance
| Composite decking material cost: | $4 to $16 per square foot (boards only) |
| Total installed cost (materials + labor): | $25 to $50 per square foot |
| Average 12x16 deck (192 sq ft): | $4,800 to $9,600 |
| Average 16x20 deck (320 sq ft): | $8,000 to $16,000 |
| Average 20x20 deck (400 sq ft): | $10,000 to $20,000 |
| Labor cost range: | $10 to $25 per square foot |
| Old deck demolition: | $5 to $15 per square foot |
| Permits: | $225 to $500 (varies by municipality) |
Note: All figures reflect 2026 pricing for the U.S. and Canadian markets.
Composite Decking Cost Per Square Foot: Materials Breakdown
Composite decking material costs range from about $4 to $16 per square foot for the boards alone. That's a wide range because "composite decking" isn't one product. It's a category that includes everything from budget-friendly hollow-core boards to premium solid-core options with advanced capping technology.
Here's how the main types of composite decking compare on price:
| Composite Type | Cost Per Sq Ft (Material) |
Best For |
| Uncapped composite | $3 to $7 | Tight budgets, covered areas |
| Capped composite (hollow core) | $5 to $10 | Most residential projects, renovations |
| Capped composite (solid core) | $8 to $16 | High-traffic areas, stairs, premium builds |
| PVC decking | $7 to $15 | Maximum moisture resistance, docks, pools |
These prices cover the deck boards themselves. You'll also need fasteners, fascia boards, and potentially substructure materials, which we'll cover in the hidden costs section below.
Capped vs. Uncapped Composite: What You Pay and What You Get
Capped composite boards have a protective polymer shell wrapped around all sides of the board. This capping is what protects against fading, staining, scratching, and moisture damage. Uncapped boards lack this outer layer, which makes them cheaper but significantly less durable.
Our recommendation: Always choose capped composite. The $2 to $5 per square foot premium pays for itself within a few years through eliminated maintenance costs. Uncapped composite can absorb moisture and stain over time, which defeats the purpose of going composite in the first place.
Solid Core vs. Hollow Core Boards
Hollow core composite boards are lighter and less expensive. They work well for the main deck surface where they're fully supported by joists. Solid core boards are denser, stiffer, and better suited for stairs, borders, and high-traffic commercial applications.
TruNorth® offers both options. The Enviroboard is a hollow-core board with full 4-sided capping, starting around $3.35 per linear foot. The Accuspan (Gen II) Solid Core board starts around $5.19 per linear foot for solid colors. Both carry a 25-year warranty for fade and stain resistance.
For most homeowners building a standard backyard deck, the hollow-core Enviroboard delivers the same visual quality and durability at a lower price point. Save the solid core boards for stairs and border accents where the extra stiffness matters.
Why Rice Husk Composites Cost Differently Than Wood-Fiber Boards
Most composite decking on the market uses wood fibers mixed with recycled plastic. That's fine, but wood fibers still behave like wood. They can absorb moisture over time, and they're more susceptible to mold and fire.
TruNorth® uses a proprietary rice husk formula instead of wood fibers. This is a critical distinction that affects both performance and long-term cost:
| Feature | Wood-Fiber Composite | Rice Husk Composite (TruNorth) |
| Moisture absorption | Moderate | Very low (rice husks absorb less) |
| Rot/mold risk | Possible over time | Eliminated (no wood content) |
| Fire resistance | Standard | Superior (more fire retardant) |
| Scratch resistance | Moderate | High (harder capping) |
| Recycled content | Varies (50-80%) | 95% |
| Heat performance | Standard | Heat-blocking technology |
The rice husk formula costs roughly the same as mid-tier wood-fiber composites. But because it eliminates the primary failure mode of wood-fiber composites (moisture absorption), the 25-year total cost is lower. You're less likely to face board replacement or warranty claims.
Labor Cost to Build a Composite Deck
Professional installation typically costs $10 to $25 per square foot for labor alone. That range depends on your region, the complexity of your deck design, and whether you're building on an existing substructure or starting from scratch.
For a straightforward 300-square-foot deck on an existing frame, expect labor costs of $3,000 to $5,000. For a new build with footings, framing, stairs, and railing, labor can easily reach $7,500 to $12,000 for the same footprint.
What Drives Labor Costs Up (and How to Keep Them Down)
Several factors increase the labor cost to build a composite deck:
| Cost Factor | Impact on Labor | How to Manage It |
| Deck height/elevation | +20-40% for raised decks | Ground-level designs save significantly |
| Multi-level or curved design | +30-50% | Simple rectangular layouts cost the least |
| Stairs | $1,400 to $2,600 installed | Minimize stair runs where possible |
| Railing | $20 to $60 per linear foot | Choose simple styles; skip on low decks |
| Remote location | +10-25% | Material delivery and travel time add up |
| Hidden fastener systems | +$1 to $2/sq ft | Cleaner look; factor into budget upfront |
DIY vs. Professional Installation: A Realistic Cost Comparison
Installing composite decking yourself can save you 40-60% on total project cost. But be honest about your skill level. Composite material is forgiving in some ways (it cuts with standard woodworking tools) but less forgiving in others (gaps between boards need to be precise, and improperly installed fasteners void most warranties).
| DIY | Professional | |
| Material cost (300 sq ft) | $2,400 to $4,800 | $2,400 to $4,800 |
| Labor cost | $0 (your time) | $3,000 to $7,500 |
| Tool rental | $200 to $500 | Included |
| Risk of errors/waste | Higher (add 15-20% material) | Lower (5-10% waste) |
| Total estimated cost | $3,000 to $6,000 | $6,000 to $13,000 |
| Time to complete | 3 to 7 days | 2 to 4 days |
| Warranty coverage | May be limited | Full coverage |
TruNorth® boards are compatible with the Slide & Go® hidden fastening system, which simplifies DIY installation. The grooved-edge boards clip together without visible screws, so even first-time builders can achieve a professional-looking result.
Total Composite Deck Cost by Size
One of the most common questions we hear: "How much does a 20x20 composite deck cost?" Here's the answer for several popular deck sizes, including both material and professional installation:
| Deck Size | Square Feet | Material Cost | Installed Cost (Total) |
| 10x10 | 100 | $1,500 to $3,200 | $2,500 to $5,000 |
| 10x12 | 120 | $1,800 to $3,800 | $3,000 to $6,000 |
| 12x16 | 192 | $2,900 to $6,100 | $4,800 to $9,600 |
| 14x20 | 280 | $4,200 to $8,900 | $7,000 to $14,000 |
| 16x20 | 320 | $4,800 to $10,200 | $8,000 to $16,000 |
| 20x20 | 400 | $6,000 to $12,800 | $10,000 to $20,000 |
| 20x24 | 480 | $7,200 to $15,400 | $12,000 to $24,000 |
These ranges assume a single-level, attached deck with standard railings. Multi-level designs, built-in seating, or premium add-ons like deck lighting will push you toward the higher end.
Hidden Costs That Catch Homeowners Off Guard
The sticker price for composite deck boards is only part of the story. Here are the cost factors that surprise homeowners most often.
Substructure and Framing
If you're building a new deck from scratch, you need footings, posts, beams, and joists before a single deck board goes down. Substructure costs typically add $5 to $15 per square foot depending on soil conditions, deck height, and local building codes. For a 300-square-foot deck, that's an additional $1,500 to $4,500.
Permits and Inspections
Most municipalities require a building permit for deck construction. Costs range from $225 to $500. Some areas also require inspections during and after construction. Contact your local building department before you start. Many deck contractors handle permits as part of their service.
Old Deck Demolition and Disposal
Tearing out an existing deck costs $5 to $15 per square foot. For a 300-square-foot old deck, that's $1,500 to $4,500 just for removal. Add $200 to $400 for debris hauling and disposal fees. If you're replacing an old wood deck with composite, this is the cost factor that catches people off guard most often.
Railings, Stairs, and Accessories
Deck railing installation typically costs $20 to $60 per linear foot. New deck stairs run $1,400 to $2,600 installed. Deck lighting adds $100 to $300+ depending on the system. Fascia boards provide a finished look and cost $4 to $8 per linear foot. These accessories can add $2,000 to $6,000 to an average-sized deck project.
Cost to Replace Deck Boards with Composite
If your existing deck frame is still in good shape, you can save significantly by replacing just the deck boards. This is one of the most popular ways to upgrade to composite without the full cost of a new build.
The labor cost to replace deck boards with composite typically runs $8 to $15 per square foot when the substructure is sound. Combined with material costs, a board-only replacement on a 300-square-foot deck usually totals $3,500 to $8,000.
Before you commit to a board-only replacement, have a contractor inspect your joists, beams, and ledger board. Wood substructures deteriorate over time, especially if the original deck boards were showing rot or water damage. Replacing composite boards on a failing frame is a waste of money.
This is where TruNorth® Enviroboard shines for renovation projects. The hollow-core design keeps weight down, so it puts less stress on an existing substructure compared to heavier solid-core boards. Lighter weight also makes the boards easier to handle during a DIY replacement.
Composite Deck vs. Wood Deck: The 25-Year Cost Comparison
Composite decking costs more upfront. That's a fact. But the real question isn't "how much does it cost?" It's "how much does it cost over the life of the deck?"
Here's the math for a 300-square-foot deck over 25 years:
| Cost Category | Pressure-Treated Wood | Composite (Capped) |
| Initial material + install | $6,000 to $9,000 | $7,500 to $15,000 |
| Annual maintenance (stain, seal, sand) | $300 to $600/year | $0 to $50/year (soap and water) |
| Maintenance over 25 years | $7,500 to $15,000 | $0 to $1,250 |
| Deck replacement (wood lasts ~10-15 yrs) | $6,000 to $9,000 (second deck) | $0 (25-year warranty) |
| Repair costs (boards, nails, rot) | $1,000 to $3,000 | $0 to $500 |
| 25-year total cost | $20,500 to $36,000 | $7,500 to $16,750 |
The composite deck costs 50-60% less over 25 years in most scenarios. That's before you factor in the time savings. If you value your weekends at even $25 per hour, the 4-8 hours per year spent maintaining a wood deck adds another $2,500 to $5,000 over 25 years.
Products like TruNorth® composite decking, which uses rice husks instead of wood fibers, further tilt this comparison. The 0% wood content means zero risk of rot or mold, which eliminates the most common cause of composite board failure in wood-fiber products.
5 Ways to Save on Your Composite Decking Project
- Buy factory-direct. Purchasing composite decking online directly from the manufacturer or an authorized factory-direct retailer can save you up to 20% compared to retail pricing. Composite Deck Direct offers this pricing on all TruNorth® products with a best price guarantee.
- Choose hollow-core boards for the field. Use solid core only where you need it (stairs, borders, high-traffic spots). The performance difference on a flat deck surface is negligible, but the cost savings are meaningful.
- Keep your design simple. A rectangular, single-level deck is the most cost-effective shape. Every angle, curve, and level change increases both material waste and labor hours. You can always add features like built-in benches or planters in a future phase.
- Reuse your existing substructure. If your current deck frame is structurally sound, replacing only the deck boards with composite saves $5 to $15 per square foot in framing and demolition costs.
- Order free samples before committing. Seeing and touching the boards before you buy prevents expensive color-change regrets. Request free samples to compare colors and textures in your actual outdoor lighting conditions.
What We Got Wrong About Composite Deck Costs (And What We Learned)
When we first started advising customers on composite deck costs, we made a few assumptions that turned out to be wrong.
We underestimated demolition costs. Early on, we quoted deck replacement projects without adequately accounting for old deck removal. Customers who budgeted $10,000 for a new composite deck found themselves facing an extra $2,000 to $4,000 to tear out the old one. We now include demolition estimates in every replacement project quote.
We assumed all homeowners should hire professionals. In reality, a confident DIYer with basic tools can install composite deck boards on an existing frame in a weekend. The hidden fastener systems have gotten much easier to use. If your substructure is already in place and you're comfortable with a circular saw, the labor savings are substantial.
We thought darker colors were always the best sellers. Turns out, in southern climates, darker composite boards can retain more heat underfoot. Heat-blocking technology (like the kind built into TruNorth® boards) helps, but we now recommend that customers in hot regions request samples of both light and dark colors so they can test comfort before ordering 400 square feet of material.
FAQ: Composite Deck Installation Costs
How much does it cost to install composite decking per square foot?
Composite deck installation costs between $25 and $50 per square foot, including materials and labor. Material costs account for $4 to $16 per square foot, with labor adding $10 to $25 per square foot. The wide range reflects differences in composite quality, deck complexity, and regional labor rates.
Is composite decking cheaper than wood in the long run?
Yes. Over 25 years, a composite deck typically costs 50-60% less than a pressure-treated wood deck when you factor in maintenance, staining, sealing, and the likely need to replace a wood deck at least once. Wood decking requires $300 to $600 per year in maintenance, while composite needs only soap and water.
How much does labor cost to replace deck boards with composite?
The labor cost to replace deck boards with composite runs $8 to $15 per square foot when the existing substructure is in good condition. A full board replacement on a 300-square-foot deck typically costs $3,500 to $8,000 total for materials and labor combined.
What is the average cost to build a 12x16 composite deck?
A 12x16 composite deck (192 square feet) costs between $4,800 and $9,600 installed, including materials and professional labor. Adding railings, stairs, or premium features will increase the total cost.
Does composite decking increase home value?
Yes. Outdoor living improvements, including composite decks, typically return 65-80% of their cost at resale according to Remodeling Magazine's annual Cost vs. Value report. Composite decks may return even more because buyers value the low-maintenance appeal.
How long does composite decking last?
High-quality composite decking lasts 25 to 30+ years with minimal maintenance. Products with 4-sided capping and advanced formulas (like rice husk composites) tend to outlast wood-fiber composites. Most premium composite boards come with 25-year warranties covering fade and stain resistance.
Can I install composite decking over my existing wood deck?
In most cases, yes, if the substructure is structurally sound. You'll need to remove the old deck boards and inspect the joists, beams, and ledger board for rot or damage. Composite boards are typically heavier than wood boards, so the existing frame must