How Much Does a 20 x 20 Composite Decking Cost in 2026?

Composite decking boards are a popular choice for outdoor living spaces. Because it lasts a long time, doesn’t need much upkeep, and looks better than regular wood. The entire cost of installing a 20×20 deck (400 square feet) is usually between $16,000 and $32,000. This depends on the materials, the amount of work needed, how complicated the design is, and where it is.

Cost of Composite Decking

On average, composite decking materials cost between $8 and $18 per square foot. The cost of labor to install them varies by location and project complexity, but it usually falls between $20 and $40 per square foot. For most projects, the overall cost of installation, including the substructure (framing, joists, and fasteners), is between $40 and $80 per square foot. This means that a 20×20 deck will cost between $16,000 and $32,000, but it could cost more if it has high-end amenities or a complicated design that is raised.

Below is a breakdown of costs for attached ground-level or elevated composite decks categorized by deck size. Typical installation costs range from $40 to $80 per square foot, including framing and foundation. Actual prices may be higher in high-cost urban markets or for complex custom designs.

Solid Capped Composite Decking Board CO-03

Capped with an HDPE layer, Capped Composite Decking is made excellent at resisting stains, scratches, weathering, and fading.

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Cost by Deck Type

Different deck designs influence costs due to structural requirements and code compliance.

Prices include the substructure and surface. And elevated and multi-level designs add costs for footings, drainage, and engineered supports.

Factors Affecting the Cost of Installing Composite Decking

There are a number of things that can make your project total go up or down. By 2026, better supply chains have made the prices of composite materials more stable. However, increased labor costs and strong demand in many cities mean that overall installation costs are still high and can be 20–30% higher than the national average in dense markets.

Additional influences:

• Design and Texture: Intricate patterns or wood-like grains add $2-5 per square foot.
• Capped vs. Uncapped: Capped (with protective layer) costs 20-30% more but resists fading better.
• Solid vs. Hollow: Solid is stronger and more expensive; hollow suffices for most uses.
• Fasteners: Hidden fasteners ($1-2 extra per square foot) improve aesthetics but take longer to install.
• Posts and Footings: In cold climates, frost-line compliant footings add $500-2,000.
• Drainage Systems: $1,000-4,000 to prevent rot; essential for elevated decks.
• Gravel Base: $0.85-2.80 per square foot for weed control and runoff.
• Railings: $20-60 per linear foot.
• Stairs: $20-30 per square foot, plus $80-160 for foundations.
• Ground Leveling: $500-1,000 if needed.
• Location: Urban areas are 20-30% higher due to demand.
• Permits: $50-150, depending on local codes.
• Design Fees: $100-220 per hour for engineers on complex projects.

Customization and Extra Features

Installation of special features that add to outdoor living requires additional fees, such as

• Outdoor furniture can cost between $500 and $1,500 per set.
• Outdoor lights can cost between $80 and $300 per light.
• Deck hot tubs range in price from $3,000 to $10,000, with installation costs typically between $150 and $500.
• Installation of ceiling fans can cost between $150 and $400 each.
• Outdoor fireplaces cost between $1,500 and $9,000.
• It costs $200 to $6,000 to erect an awning that can be used year-round or for short periods of time.
• Walkways cost from $7 to $35 per square foot.
• Built-in wood benches can cost between $1,000 and $1,500, depending on the size of the deck.
• Covered decks cost between $10 and $60 per square foot, depending on the type of deck roof.
• It costs between $4,300 and $10,000 to build a shade gazebo.
• Installing a pergola for partial shade can cost between $1,450 and $5,570.
• Building an outdoor kitchen with a built-in grill costs between $3,000 and $10,000.
• A gardener can charge $50 to $100 per hour for landscaping changes to your yard.

Composite Decking Material Prices

Purchasing composite decking boards can cost between $4 and $18 per square foot. Footings, steps, railings, and substructures will cost extra. Most composite decking is made of polyethylene.

• Polyethylene (HDPE) Decking: This type of composite decking looks most like solid wood. However, PE and HDPE decking will retain more heat, so light-colored composite decking is recommended for sunny areas.
• PVC Decking: Appearance is more like plastic. Offers excellent mold resistance. However, it expands and contracts with temperature changes.
• Polypropylene (PP) Decking: Polypropylene decking can handle extreme heat better than other types of composite decking. This material won’t buckle when wet for long periods of time, but it can easily break in cold places.

Updated 2026 brand of composite decking prices (materials only per square foot):

Prices reflect 2026 market averages. Please check retailers for regional variations.

Composite Decking Material VS. Wood Decking

The cost to install composite decking is $40 to $80 per square foot. The cost to build a wood deck is $25 to $50 per square foot. Although composite decking has a higher initial cost, it boasts a lifespan of 25 to 50 years with minimal maintenance requirements. In contrast, wooden decking typically lasts 10 to 25 years and necessitates regular sealing.

Over time, composite decking typically proves more cost-effective than wood decking. This is because it reduces expenditures on maintenance products, labor, and periodic renovations. This is especially true for large decks or areas with harsh climates.

Learn More: Compare Composite Decking vs Wood Cost

Things to Ask About Hiring a Deck Contractor

If you are not planning to install composite decking yourself DIY, here are some questions you can ask a professional deck contractor when you are looking for one:

• How long have you been installing composite decking?
• Can you provide me with project photos of the composite decking you installed?
• What style of decking do you think will work best for my house?
• Are there any additional costs?
• If there are additional costs, how will they be handled?
• What are the best brands or types of composite decking boards?
• Does the Composite decking manufacturer offer a warranty?
• When do you think construction will begin, and how long will it take?
• Do you guarantee the installation work?
• Who is responsible for obtaining the necessary permits?
• Does the price include substructure, labor, materials, delivery, and cleanup?
• How do you dispose of construction debris?

FAQs About Composite Decking

What is Composite Decking?

Composite decking is a decorative product produced by mixing wood fibers and plastic. It is a durable alternative to wood decking. Some composite decking is made entirely of plastic, while others are made from more recyclable plastics and chemicals, making them longer-lasting and more UV-resistant.

Is Composite Decking Worth Buying?

Composite decking is a great option for people who want a deck that doesn’t require much care. Composite decking materials also won’t fade, scratch, or rot, and they’re also resistant to pests. In addition, they won’t warp or crack like wood decks.

How Long Does Composite Decking Last?

When properly maintained, composite deck boards typically last between 25 and 50 years. This depends on the brand, installation, weather, and foot traffic. Regularly check your decking for loose parts and keep it dry and free of dirt to extend its life.

Does Composite Decking Increase Resale Value?

Composite decking can increase the value of your home because it is both beautiful and durable. This low-maintenance outdoor deck is especially attractive to buyers.

Can I Power Wash My Composite Decking?

You can power wash your composite decking, but only use very low pressure to avoid damaging the deck surface. Before you begin cleaning, spray the water at a gentle angle and read the cleaning instructions that come with the product.

Is Composite Decking Slippery When Wet?

Most composite decking is not slippery when wet, but it varies by brand. Most companies add a non-slip layer to prevent people from falling. On the other hand, cheaper brands may not have a good protective layer. To maintain the non-slip feature, the deck needs to be cleaned frequently.