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Blog
Home > Blog > How Much Does a 20 x 20 Composite Deck Cost?
22May
  • By EVODEK
  • Thu, May 22, 2025
  • 7932 Views

How Much Does a 20 x 20 Composite Deck Cost?

Outdoor patios are the perfect outdoor living space for recreation and relaxation. and more and more people are looking to install outdoor composite decking. As one of the best alternatives to wood decking, this new composite building and decorating material offers great convenience and benefits to homeowners. When you are planning to get composite decking for your home, make sure you know the costs associated with it. This is extremely important as it may save you an unnecessary expense.

Table of Contents

  • Average composite deck cost by square feet
  • Average Composite Deck Cost
  • Factors Affecting the Cost of Composite Deck
  • Where to Build a Composite Deck
  • Building Permits
  • Design Fees
  • Customization and Additional Features
  • Frequently Asked Questions about Composite Deck

Average composite deck cost by square feet

The average composite deck cost depends on several factors, including the material chosen. the ease of installation, the cost of installation, and the size and shape of the home. In general, composite deck materials usually cost between $14 and $32 per square foot. Labor costs to build a composite deck range from $24 to $48 per square foot, so the cost to install a composite deck ranges from $40 to $80 per square foot. Exact prices may vary depending on your location and specific requirements so prices can vary widely. As an example, the cost to build a 20’x20′ composite deck would be approximately $16,000 to $32,000.

Deck Size (ft.)Square FeetAverage Installation Cost*
8’x10′80$3,200 – $6,400
10’x10′100$4,000 – $8,000
10’x12′120$4,800 – $9,600
12’x12′144$5,750 – $11,500
12’x14′168$6,700 – $13,450
12’x16′192$7,680 – $15,350
12’x18′216$8,650 – $17,280
12’x20′240$9,600 – $19,200
14’x20′280$11,200 – $22,400
16’x16′256$10,250 – $20,480
20’x20′400$16,000 – $32,000
20’x24′480$19,200 – $38,400
24’x24′576$23,000 – $46,000
*Applicable to attached ground and elevated composite decks
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Average Composite Deck Cost

Based on statistics, it is roughly estimated that the cost of installing a composite deck (including labor and materials) is around $9,000, with most composite decks costing between $5,400 and $11,400. Larger composite decks cost up to $20,000. While smaller composite decks cost as low as $3600. As mentioned above, prices can vary depending on the materials chosen. ease of installation, labor costs, and the size and shape of the home.

Composite Deck Cost
Average Cost$9,000
Maximum Cost$20,000
Lowest Cost$3,600

Factors Affecting the Cost of Composite Deck

To give you a clear idea of the costs involved in installing a composite deck. let’s break down the various factors that may affect the price of the project one by one.

First and foremost, labor costs for building composite decks are higher than wood decks because they require care and patience when assembling and require a large number of parts and accessories. It is roughly estimated that the cost of hiring labor to install a composite deck is between $24 and $48 per square foot.

FactorsCost per square foot*
Materials$16 – $32
Labor$24 – $48
Total Installation Cost$40 – $80
*Prices for additional ground platforms and elevated decks (including bases).

Types of Composite Deck

There are two main types of composite deck materials: capped composites and uncovered composites. capped composites have a protective film on the outside that increases resistance to the natural elements. Because of this, composite decks are more expensive than other decking materials, averaging $30 to $60 per square foot. Uncovered composite decks, on the other hand, are often more cost-effective, with prices ranging from $20 to $40 per square foot.

Types of Material Quality

Materials such as wood plastic composite (WPC) are cheaper, ranging from $25 to $40 per square foot. Polyvinyl chloride (PVC) flooring, on the other hand. is often considered higher quality and more expensive, with prices ranging from $40 to $70 per square foot.

Designs

The composite deck offers a wide variety of colors, textures, and patterns to choose from, and these choices will have an impact on your project. High-quality designs or finishes can mimic the look of natural wood or exotic hardwoods but can be more expensive. while more basic solid color options are more affordable.

For example, realistic wood-grain textures can cost between $30 and $60 per square foot, while smooth, solid-colored composite decking can cost $25 to $40 per square foot.

Additionally, more complex installation designs, such as diagonal or herringbone patterns. may increase labor costs and result in higher overall project costs.

Types of Composite Deck

The most common types of composite decks are hollow composite decks and solid composite decks. hollow composite decks are commonly used in everyday life and are strong enough for most applications. However, a solid composite deck is more costly and naturally stronger. It is often used in special situations.

20 x 20 composite deck cost

Types of Accessories

Commonly used fittings are quicker to install and less expensive. Concealed fittings, on the other hand, look more beautiful and natural from the outside, but are more difficult to install. slower, and more costly.

Drainage Systems for Decks

Installing a brand-new drainage system can cost roughly $1,000 to $4,000. Drainage systems are vital to keep the deck supports from corroding. but also from clogging or otherwise causing damage to the original look of the deck to be repaired.

Gravel Base

Pea gravel ranges from $0.85 to $2.80 per square foot. The placement of gravel prevents weeds from growing and aids in the flow of water.

Railing

Installing composite Railing on a composite deck, or wood Railing costs about $20 to $60 per foot.

Stairs

The cost to install composite deck stairs is about $20 to $30 per square foot, with an additional base cost of concrete, which is about $80 to $160.

Leveling the Ground

Before building an outdoor deck project, level the yard to keep it level. The cost for a yard is about $500 to $1,000.

Where to Build a Composite Deck

20 x 20 composite deck cost

The cost of labor to build a deck depends on where you live, often cities that are busy enough or crowded enough and have a higher demand for decks cost more than rural or remote areas.

Building Permits

When building a deck, a building permit is required, which can range from $50 to $150. This depends on the size of the deck and the building codes in the area where you live.

Design Fees

When you want to build homes that are aesthetically pleasing enough, you naturally need a good design. The labor cost for a structural engineer who looks after the site and creates the design plans is around $100 to $220 per hour. If the plans for the building are larger or more complex. Then an engineer will be needed to create a specialized design for permits.

Customization and Additional Features

Installation or Other Costs, Such as:

  • Cost of outdoor furniture
  • Cost per outdoor light
  • Cost of installing outdoor plugs and sockets
  • Cost of deck hot tub
  • Cost to install a hot tub
  • Cost per ceiling fan installation
  • Price cost of an outdoor fireplace. (Check building codes in your area to make sure the fireplace is designed for safe use on the deck.)
  • Cost of building an awning that can be used year-round or for a short period
  • Cost of a concrete sidewalk
  • Cost of a built-in wooden bench (depending on the size of the deck)
  • Cost of building a shade pergola
  • Cost of installing a partial shade pergola
  • Cost of building an outdoor kitchen with a built-in grill
  • Cost of landscaping in the yard by a gardener
composite decking cost

Frequently Asked Questions about Composite Deck

What is a Composite Deck?

Composite wood decks, also known as engineered wood flooring, is a type of decking composed of multiple layers of materials designed to provide enhanced durability and stability. The top layer is typically made of hardwood veneer, providing the aesthetic appeal of real wood. while the core layers are constructed from high-density fiberboard or plywood, offering strength and resistance to moisture and temperature fluctuations. This multi-layer construction helps to prevent the flooring from warping or bowing. making it suitable for use in areas where traditional hardwood may not be ideal. such as basements or kitchens.

Additionally, composite decking boards often feature a pre-finished surface. reducing the need for sanding and finishing after installation. Its versatility, durability, and ease of maintenance make it a popular choice for homeowners seeking the look of hardwood with added practical benefits.

Is Composite Deck Worth Buying?

Composite deck, or engineered wood decking, presents a compelling option for purchase due to its numerous benefits. Firstly, its multi-layer construction provides enhanced stability and resistance to moisture and temperature changes, making it suitable for installation in areas where traditional hardwood may not be ideal. This durability can translate to long-term cost savings, as the floor is less prone to warping, and bowing. or other damage that might require repairs or replacement.

Furthermore, composite wood decking often features a top layer made from genuine hardwood veneer. offering the aesthetic appeal of real wood with a more affordable price tag. This allows homeowners to achieve the look and feel of hardwood without breaking the bank. Additionally, the pre-finished surface of composite decking material reduces the need for sanding and finishing after installation, saving both time and money during the renovation process.

From a practical standpoint, composite decking is relatively easy to maintain, requiring minimal effort to keep it clean and in good condition.

Its versatility and suitability for various environments make it a valuable investment for homeowners seeking a durable, attractive, and cost-effective decking solution.

composite decking cost

The Life Expectancy of Composite Deck

The lifespan of composite decking boards, also known as engineered wood flooring, is influenced by several factors. Typically, high-quality composite deck boards can endure for 20 to 30 years, and sometimes even longer with proper care and maintenance. However, it’s important to consider the quality of the materials used, the installation techniques employed, and the level of foot traffic in the area where the flooring is installed. Additionally, environmental conditions such as humidity levels and temperature fluctuations can impact the longevity of composite decking.

Proper maintenance plays a significant role in extending the lifespan of composite decks. Regular cleaning using appropriate products and methods, promptly addressing any spills or water exposure, and minimizing abrasive wear from furniture and footwear can all contribute to preserving the integrity of the flooring. Following the manufacturer’s guidelines for maintenance and considering their warranty coverage can offer valuable insights into maximizing the lifespan of composite deck boards.

Ultimately, while the average lifespan of composite decking falls within the 20 to 30-year range, proactive care and adherence to recommended practices can help ensure that the flooring remains a durable and attractive feature in residential and commercial spaces for many years to come.

Does Composite Decking Increase Resale Value?

Composite decking can potentially increase the resale value of a property for several reasons. Firstly, composite decking is known for its durability and low maintenance requirements. making it an attractive feature for prospective buyers. Unlike traditional wood decking, composite materials are resistant to issues such as rotting, warping, and splintering. and insect damage, thus presenting a long-term investment in terms of both aesthetics and functionality.

Moreover, the aesthetic appeal of composite decking can enhance the overall visual appeal of outdoor spaces. which is often a key selling point for potential buyers. The availability of composite decking in a wide range of colors and finishes allows homeowners to create an outdoor living area that is visually appealing and complements the architecture and style of the home, thereby adding to its perceived value.

Furthermore, the longevity of composite decking, coupled with its resistance to environmental factors and wear. means that potential buyers may view it as a valuable feature that reduces the need for costly repairs or replacements in the future. This peace of mind regarding the durability and longevity of the outdoor living space can contribute to a positive perception of the property’s overall value.

Overall, while individual market dynamics and buyer preferences can influence the direct impact of composite decking on resale value, its durability, low maintenance. and aesthetic appeal are factors that can potentially contribute to a favorable impression and increased desirability among potential buyers, ultimately influencing the property’s resale value positively.

Can I Power Wash My Composite Decking?

Yes, you can power wash your composite decking, but it’s important to do so with caution and using the appropriate techniques. Power washing can be an effective method for cleaning composite decking, especially when dealing with stubborn dirt, stains, or mildew. However, it’s crucial to use a power washer with the right settings to avoid damaging the surface of the decking.

When power washing composite decking, it’s recommended to use a fan tip and keep the pressure at a moderate level. typically around 1500-2000 psi, to prevent any potential damage to the material. Additionally, maintaining a safe distance of at least 8-12 inches between the nozzle and the decking surface is essential to minimize the risk of causing any splintering or surface abrasion.

Furthermore, before power washing, it’s advisable to test a small, inconspicuous area of the decking to ensure that the pressure and technique are suitable and do not cause any adverse effects. Additionally, using a cleaning solution specifically formulated for composite decking in conjunction with the power washing process can enhance the effectiveness of the cleaning while helping to protect the material.

In summary, while power washing can be used to clean composite decking, it’s crucial to exercise care. use the appropriate equipment and techniques, and consider any manufacturer recommendations to ensure that the process is carried out safely and effectively without causing damage to the decking.

Is Composite Decking Slippery When Wet?

Composite decking can have varying levels of slipperiness when wet, depending on the specific texture and finish of the material. In general, the smooth surface of some composite decking products may become slippery when wet, posing potential safety concerns. However, many manufacturers address this issue by incorporating textured finishes or embossed patterns that enhance traction and reduce the risk of slipping, even when the decking is wet.

It’s important to note that environmental factors, such as the presence of algae, mold, or debris on the decking surface, can also contribute to increased slipperiness when wet. Regular cleaning and maintenance to remove such substances can help mitigate this risk.

Furthermore, homeowners can consider applying an anti-slip coating specifically designed for use on composite decking to further enhance traction and improve safety, particularly in areas prone to moisture exposure.

Ultimately, some composite decking products may exhibit slipperiness when wet. advancements in manufacturing techniques and the availability of textured finishes have led to the development of options that offer improved grip and safety, even under wet conditions. It’s advisable to carefully consider the specific characteristics of the chosen composite decking product and explore additional measures to address any potential slipperiness based on the intended usage and environmental factors.

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Kelin Content Writer
Kelin is an accomplished writer specializing in outdoor home decor. With a background in landscape architecture and a flair for storytelling, Kelin creates compelling content that inspires homeowners to enhance their outdoor living spaces. His writing covers a range of topics from garden design and furniture placement to the latest trends in outdoor living. Known for his practical advice and innovative ideas.
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