How Much Does It Cost to Build a 20x20 Composite Deck?
Composite decking materials typically range from $21 to $42 per square foot. On top of that, labor costs for installation can vary between $31 to $62 per square foot. When you factor in the substructure, the overall cost for installing composite decking falls between $52 and $104 per square foot.
So, if you’re looking to build a 20’x20′ composite deck, you can expect to spend anywhere from $20,800 to $41,600.
Deck Size (feet) | Square Feet | Average Cost Installed* |
8’x10′ | 80 | $4,160 – $8,320 |
10’x10′ | 100 | $5,200 – $10,400 |
10’x12′ | 120 | $6,240 – $12,480 |
12’x12′ | 144 | $7,475 – $14,950 |
12’x14′ | 168 | $8,710 – $17,485 |
12’x16′ | 192 | $9,984 – $19,955 |
12’x18′ | 216 | $11,245 – $22,465 |
12’x20′ | 240 | $12,480 – $24,960 |
14’x20′ | 280 | $14,560 – $29,120 |
16’x16′ | 256 | $13,325 – $26,624 |
20’x20′ | 400 | $20,800 – $41,600 |
20’x24′ | 480 | $24,960 – $49,920 |
24’x24′ | 576 | $29,900 – $59,800 |
Cost of Different Types of Composite Decking
The following table shows the cost of building different types of outdoor composite decking:
Deck Design Type | Cost per Square Foot Installed* |
Ground-level / platform (Attached) | $52 – $65 |
Detached / floating (Freestanding, no railings, no stairs) | $39 – $52 |
Elevated (Attached) | $65 – $104 |
Second-story (Attached) | $104 – $130 |
Multi-level (Attached) | $117 – $169 |
Ground-level or Platform Decking
Ground-level or platform decks are a great option for homes with minimal elevation changes in the backyard. Typically standing less than 30 to 36 inches high, these decks are often attached to the house at the back door, providing a seamless transition from indoor to outdoor living spaces. They can include deck railings if desired for added safety and aesthetics. The installation cost can increase depending on the number of steps needed to reach the deck and whether the foundation needs reinforcement to handle the deck’s weight. These decks are perfect for barbecues, outdoor dining, or creating a cozy lounging area.
Freestanding or Floating Decks
Freestanding or floating decks are versatile and can be placed anywhere in the yard, making them an excellent choice for homes with uneven terrain or large outdoor spaces. These decks do not require railings, stairs, or deep footings below the frost line, making them easier and less expensive to install. Often, these lightweight decks are supported only by dirt and concrete blocks, which also makes them easier to relocate if needed. In many places, these types of decks do not require a permit because they are not attached to the house. They are ideal for creating a private retreat in a secluded part of your yard or enhancing a garden area.
Elevated Decks
Elevated decks are at least three feet above the ground and are typically situated below the second story of a home. These decks provide an elevated view of the surrounding landscape and can make your outdoor space feel more expansive. The base of this type of deck is usually made of reinforced concrete to ensure stability and durability. Building codes require elevated decks to have sturdy deck railings for safety. These decks are perfect for homes with sloping yards, as they can level out the outdoor living area and provide additional storage space underneath.
Second-level Decks
Second-level decks are popular because they create a shaded porch below, adding valuable outdoor living space on multiple levels. These decks are attached to the second story of a house, requiring large columns and sturdy supports to ensure they are safe and secure. The shaded area below can be used as a patio, storage, or even an outdoor kitchen. Second-level decks offer an excellent vantage point for enjoying views and can significantly enhance the appearance and functionality of your home’s exterior.
Multi-level Decks
Multi-level decks are the most costly type of outdoor deck but also the most versatile and visually appealing. They are particularly popular in homes with two or more levels, allowing for a series of connected decks that can serve different purposes. These multiple levels can create distinct areas for dining, lounging, gardening, and even hot tubs. Multi-level decks can significantly increase your home’s usable outdoor space and create a seamless flow between indoor and outdoor living areas. These decks require careful planning and design to ensure they integrate well with the house and landscape, but the result is a stunning and functional outdoor living environment that adds significant value to your property.
Factors Affecting the Cost of Installing Composite Decking
Labor costs for building composite decking are generally higher than for wood decks due to the need for more careful assembly and the use of more components. Here is a breakdown of the costs involved:
Factor | Cost per Square Foot* |
Materials | $21 – $42 |
Labor | $31 – $62 |
Total Cost to Install | $52 – $104 |
Factors Influencing the Cost of Installing Composite Decking
Design Ideas
The cost of your composite decking project will vary significantly based on the design choices you make. Decking surfaces come in a range of colors and textures, with some mimicking the look of natural wood. Composite decking with intricate patterns and wood-like textures tends to be the most expensive, as these designs require more advanced manufacturing processes and higher quality materials. Basic colors and simpler patterns are more budget-friendly, making them a good choice if you’re looking to save on costs. Additionally, some designs may require specialized installation techniques, further influencing the overall cost.
Capped vs. Uncapped Composite Decking
When choosing between capped and uncapped composite decking, it’s important to consider both cost and longevity. Capped composite decking is more expensive because it includes an additional protective polymer layer. This layer enhances the decking’s resistance to moisture, stains, and UV rays, making it more durable and easier to maintain over time. Uncapped composite decking, while cheaper upfront, may require more maintenance and might not last as long in harsh weather conditions. This trade-off should be considered when budgeting for your project.
Solid vs. Hollow Composite Decking
The choice between solid and hollow composite decking impacts both cost and performance. Hollow composite decking is typically lighter and less expensive, making it a good option for budget-conscious projects. However, it may not be as strong or durable as solid composite decking. Solid composite decking is denser and offers greater stability and strength, which can be particularly important for high-traffic areas or larger decks. The higher cost of solid decking reflects its increased durability and load-bearing capacity.
Types of Fasteners
The type of fasteners used in your decking project can also affect the overall cost. Traditional fasteners, such as screws and nails, are quicker to install and less expensive. However, they remain visible, which can detract from the deck’s appearance. Hidden fasteners, on the other hand, provide a cleaner, more streamlined look by concealing the attachment points. While they enhance the deck’s aesthetics, hidden fasteners take longer to install and can increase labor costs. The choice between these fasteners will depend on your budget and aesthetic preferences.
Posts
In colder climates, it’s crucial to ensure that the concrete footings for your deck extend below the frost line to prevent shifting and instability. Wooden deck struts should not be buried directly in the ground, as this can lead to rot and structural failure over time. Instead, using concrete or metal footings can enhance the longevity and stability of your deck. Proper installation of posts is essential for the deck’s overall safety and durability, particularly for elevated or multi-level decks.
Deck Drainage Systems
A deck drainage system is vital for preventing water accumulation and potential damage to the deck’s structure. Installing a new drainage system can cost between $1,000 and $4,000, depending on the complexity and size of the deck. This system helps ensure that water does not pool around the deck supports, which can lead to rot and other issues. Proper drainage is especially important in areas with heavy rainfall or poor soil drainage, as it helps maintain the integrity of the deck over time.
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Elevated Deck Drainage Systems
For elevated decks, especially those on a second story, a drainage and runoff system is often necessary to manage water effectively. This system helps direct water away from the deck and the house, preventing damage to both structures. The cost of installing such a system is higher due to the additional materials and labor required. Proper drainage for elevated decks not only protects the deck itself but also prevents water from seeping into the house, which can cause significant damage.
Gravel Base
Using a gravel base under a raised or second-story deck offers several benefits. Pea gravel, which ranges from $0.85 to $2.80 per square foot, helps with water runoff and prevents weed growth. A gravel base ensures that water drains away from the deck’s foundation, reducing the risk of rot and other moisture-related issues. Additionally, gravel can provide a stable, level surface for the deck supports, enhancing the overall stability and longevity of the deck.
Railing
Adding railing to your composite decking not only improves safety but also enhances the deck’s aesthetic appeal. Vinyl or wood railing can cost between $20 and $60 per foot, depending on the material and design. Railings are particularly important for elevated decks, providing necessary protection to prevent falls. Choosing high-quality railing materials can increase the upfront cost but will contribute to the deck’s durability and visual appeal in the long run.
Stairs
Installing stairs for your deck is another cost factor to consider. Deck stairs typically cost between $20 and $30 per square foot, with an additional $80 to $160 for a concrete foundation. The total cost will depend on the height and width of the stairs, as well as the materials used. Stairs provide essential access to elevated decks and can also enhance the deck’s overall design. Proper installation is crucial for safety and usability.
Leveling the Ground
Before building a deck, leveling the ground is often necessary to create a stable foundation. This process can cost between $500 and $1,000, depending on the extent of the work required. Proper ground leveling ensures that the deck sits evenly and reduces the risk of structural issues over time. It is an essential step in the preparation phase of any decking project, particularly for larger or more complex designs.
Location
Labor costs for deck installation can vary significantly based on your location. In cities with high demand for deck building, labor costs tend to be higher compared to rural or less expensive areas. The availability of skilled labor, local cost of living, and regional demand for construction services all influence these costs. When budgeting for your project, it’s important to consider these regional variations to get an accurate estimate.
Building Permits
Depending on the size of your deck and local building regulations, you may need to obtain a building permit. Permit costs can range from $50 to $150. The permitting process ensures that your deck meets local building codes and safety standards. Failing to obtain the necessary permits can result in fines and potential issues when selling your home. It’s important to check with your local building authority to understand the requirements for your project.
Design Fee
For large or complex decking projects, hiring a structural engineer to develop plans and ensure compliance with building codes may be necessary. Structural engineers typically charge between $100 and $220 per hour for their services. An engineer’s specialized design is often required to obtain the necessary permits and ensure the deck is safe and structurally sound.
While this adds to the upfront cost, it provides peace of mind and helps avoid costly mistakes during construction.
Building Permits
Depending on the size of your deck and local building regulations, you may need to obtain a building permit. Permit costs can range from $50 to $150. The permitting process ensures that your deck meets local building codes and safety standards. Failing to obtain the necessary permits can result in fines and potential issues when selling your home. It’s important to check with your local building authority to understand the requirements for your project.
Customization and Extra Features
Enhancing your outdoor living space with custom features involves additional costs. Here’s a detailed breakdown of what you might expect to spend on various enhancements:
Outdoor Furniture
A set of outdoor furniture can range from $650 to $1,950, depending on the style, materials, and quality you choose. High-end materials like teak or wrought iron will push costs towards the higher end of the spectrum, while simpler plastic or aluminum sets will be more affordable. Outdoor furniture can include everything from dining sets to lounge chairs and can dramatically improve the comfort and usability of your deck space.
Outdoor Lighting
Installing outdoor lights typically costs between $104 and $390 per light. The type of lighting you choose, such as solar-powered lights, string lights, or recessed deck lights, will impact the overall cost. Proper lighting enhances both functionality and ambiance, allowing you to use your deck safely after dark and creating a welcoming atmosphere for evening gatherings. High-quality fixtures and professional installation can also contribute to higher costs but ensure long-lasting performance.
Outdoor Electrical Outlets
Adding an outdoor plug costs between $234 and $455, providing convenient power access for outdoor appliances, lighting, and other devices. This is especially useful if you plan to install an outdoor kitchen, run electric heaters, or set up an entertainment system on your deck.
The cost includes the price of weatherproof outlets and the labor required to run wiring from your home’s electrical system to the deck.
Deck Hot Tubs
Purchasing a hot tub can set you back between $3,900 and $13,000, depending on the size, features, and brand. Installation costs range from $195 to $650, including preparing the deck to support the weight and ensuring proper electrical connections. A hot tub adds luxury and relaxation to your outdoor space, providing a perfect spot for unwinding after a long day. High-end models with advanced features like built-in sound systems, lighting, and automated controls will be more expensive.
Ceiling Fans
Installing ceiling fans on your deck costs between $195 and $520 each. Ceiling fans help to keep you cool during hot weather, making your deck more comfortable during the summer months. They can also help to keep insects away and improve air circulation. Choose fans designed for outdoor use, which are more resistant to weather conditions. Higher costs are associated with more durable, stylish, and energy-efficient models.
Outdoor Fireplaces
Expect to spend between $1,950 and $11,700 on an outdoor fireplace. Fireplaces create a cozy atmosphere and extend the usability of your deck into the cooler months. They can be wood-burning, gas-powered, or electric, with varying costs based on the type and complexity of installation. Always check local building codes to ensure the fireplace is safe for deck use, as improper installation can pose a fire hazard.
Awnings
Erecting an awning can cost anywhere from $260 to $7,800, depending on whether it’s a permanent fixture or a temporary solution. Awnings provide shade and protection from the elements, making your deck more comfortable to use during sunny or rainy weather. Retractable awnings, which can be extended or retracted as needed, tend to be more expensive than fixed options but offer greater flexibility.
Concrete Sidewalks
Adding concrete sidewalks costs between $9.10 and $22.10 per square foot. Concrete sidewalks provide a durable and attractive path leading to your deck, improving accessibility and preventing mud and dirt from being tracked onto the deck. The cost can vary based on the design, thickness, and any decorative finishes you choose, such as stamped or stained concrete.
Gravel Walkways
A more rustic option, gravel walkways range from $20.80 to $45.50 per square foot. Gravel walkways are easier to install and can be more cost-effective than concrete, while still providing a functional and attractive path. They help with water drainage and can be combined with edging materials like wood or metal to keep the gravel in place and enhance the appearance.
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Built-in Wood Benches
Built-in benches for your deck can cost between $1,300 and $1,950, depending on the size and design. These benches are custom-built to fit your deck and provide a permanent seating solution. They can be designed to include storage space underneath, adding both functionality and aesthetic appeal. The choice of wood and any additional features, like cushions or backrests, will influence the overall cost.
Covered Decks
Adding a roof to your deck can cost between $13 and $78 per square foot, depending on the type and complexity of the cover. Covered decks provide shade and protection from the elements, making the space usable in various weather conditions. Options range from simple pergolas or awnings to fully enclosed structures with solid roofs. The cost will depend on the materials used and the design’s complexity.
Shade Gazebos
Building a gazebo for shade can cost between $5,590 and $13,000, offering a stylish and functional shelter. Gazebos can be standalone structures or integrated into the deck design. They provide a shaded area for relaxing or dining and can be equipped with additional features like lighting, fans, or screens to enhance comfort. High-quality materials and intricate designs will increase the cost.
Pergolas
Installing a pergola for partial shade costs between $1,885 and $7,241. Pergolas are open structures with a lattice roof that provides partial shade while still allowing some sunlight to filter through. They can be adorned with climbing plants for added beauty and natural shade. The cost varies based on the size, materials, and any additional features like retractable canopies or integrated lighting.
Outdoor Kitchens
An outdoor kitchen with a built-in grill can range from $3,900 to $13,000. This setup allows for convenient outdoor cooking and entertaining, making your deck a hub for gatherings and meals. Costs depend on the size of the kitchen, the appliances included, and the materials used for countertops and cabinetry. High-end appliances and custom-built features will increase the price.
Landscaping
Hiring a gardener to make landscaping changes can cost between $65 and $130 per hour. Professional landscaping can transform your yard to complement your new deck, adding plants, trees, pathways, and other features to create a cohesive and attractive outdoor space. The total cost will depend on the extent of the work and the types of plants and materials used.
Composite Decking Board Material Prices
When considering composite decking boards, prices can vary significantly based on the type of material. Here’s a detailed breakdown of the costs and characteristics of different composite decking options:
General Price Range
Composite decking boards now generally cost between $5.20 and $20.80 per square foot. This price range reflects the diversity of composite materials available, from basic options to high-end choices with enhanced features. Keep in mind that additional costs for footings, steps, railings, and substructures will add to the overall expense. These elements are crucial for the stability and safety of your deck, and their costs can vary based on the complexity of your design and the quality of materials used.
Polyethylene (HDPE) Decking
Polyethylene (HDPE) decking closely mimics the appearance of solid wood, making it a popular choice for those seeking a natural, wood-like look without the maintenance requirements of real wood. HDPE decking is durable, resistant to stains and scratches, and offers good longevity. However, it tends to retain more heat, which can make the surface hot to the touch in direct sunlight. For this reason, it’s advisable to choose lighter colors if your deck will be exposed to a lot of sunlight. Additionally, HDPE decking is eco-friendly, often made from recycled materials, contributing to environmental sustainability.
PVC Decking
PVC decking has a more plastic-like appearance and is available in a wide range of colors, allowing for a high degree of customization to match your aesthetic preferences. PVC decking offers excellent resistance to moisture, insects, and rot, making it a low-maintenance option. However, it tends to expand and contract with temperature changes, which can cause issues such as warping or gaps over time. Additionally, PVC decking is more prone to mold growth compared to polyethylene decking, so regular cleaning and maintenance are necessary to keep it looking its best. Despite these drawbacks, its durability and ease of maintenance make it a popular choice for many homeowners.
Polypropylene (PP) Decking
Polypropylene decking is known for its exceptional ability to withstand extreme heat better than other composite materials. This makes it an excellent choice for areas with hot climates. PP decking is highly resistant to moisture, making it less likely to buckle or warp when wet for extended periods. It is also resistant to chemical and oil spills, making it ideal for outdoor kitchens or dining areas. However, it can become brittle and break easily in colder climates, so it may not be the best choice for regions with harsh winters. Despite this, its resilience and low maintenance needs make it an attractive option for many.
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Brands of Composite Decking
The table below shows the price range for different brands of composite decking boards per square foot:
Composite Decking Brand | Material Prices per Square Foot* |
COOWIN | $2.60 – $5.20 (factory direct price) |
Veranda | $3.90 – $10.40 |
Genovations | $5.20 – $9.10 |
Deckorators | $6.50 – $11.70 |
Trex Decking | $6.50 – $19.50 |
Envision | $6.50 – $20.80 |
Gorilla | $7.80 – $15.60 |
TimberTech / Azek | $7.80 – $16.90 |
CertainTeed | $9.10 – $11.70 |
Fiberon | $9.10 – $18.20 |
Composite Decking Material vs. Wood Decking
The table below compares the costs and characteristics of composite decking and wood decking:
Feature/Characteristic | Composite Decking | Wood Decking |
Cost per Square Foot Installed | $52 – $104 | $32.50 – $65 |
Lifespan | Lasts 25 to 50 years | Lasts 10 to 25 years |
Maintenance | Low maintenance | Needs regular maintenance |
Appearance | Many color & grain options to imitate wood | Natural look of wood |
Durability | Doesn’t rot & repels termites | Choice to stain or paint a new color |
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 them:
- 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?
Conclusion
Building a 20×20 composite deck is a significant investment that offers long-term benefits. Composite decking ranges from $21 to $42 per square foot for materials, with installation labor costs between $31 and $62 per square foot, leading to an overall cost of $52 to $104 per square foot. Therefore, a 20’x20′ deck could cost between $20,800 and $41,600. Factors such as deck design, type of composite material, labor, and additional features like railings and stairs will influence the final cost. By carefully planning and considering these elements, homeowners can ensure they achieve a durable, aesthetically pleasing deck that enhances their outdoor living space.
FAQs
Composite decking materials typically range from $21 to $42 per square foot. This cost includes a variety of composite decking options, such as capped and uncapped materials. Capped composites have an additional protective layer that enhances durability and resistance to moisture, stains, and UV rays. The choice between capped and uncapped composites will affect the initial cost, with capped options generally being more expensive due to their enhanced features and longer lifespan.
Labor costs for installation can vary between $31 to $62 per square foot. This variation is influenced by factors such as the complexity of the deck design, local labor rates, and the experience level of the contractors. More intricate designs or elevated decks may require additional skills and time, leading to higher labor costs. It’s essential to obtain detailed quotes from contractors to understand how labor costs are calculated and what specific services are included.
When you factor in the substructure, the overall cost for installing composite decking falls between $52 and $104 per square foot. The substructure includes essential elements like the framing, posts, and any necessary reinforcements to ensure the deck’s stability and safety. High-quality materials for the substructure and professional installation can increase the total cost, but they are critical for the deck’s longevity and performance. Investing in a sturdy substructure can prevent future issues and reduce maintenance costs over time.
For a 20’x20′ composite deck, you can expect to spend anywhere from $20,800 to $41,600. This range accounts for variations in material quality, design complexity, and labor costs. High-end composite materials and elaborate designs with features such as built-in seating, lighting, and custom railings will push the cost towards the higher end. Conversely, simpler designs with basic materials will be more budget-friendly. It’s important to consider your specific needs and preferences when estimating the total cost.
Here’s a comparison for various deck sizes, showing how costs scale with size:
Deck Size (feet) | Square Feet | Average Cost Installed* |
8’x10′ | 80 | $4,160 – $8,320 |
10’x10′ | 100 | $5,200 – $10,400 |
10’x12′ | 120 | $6,240 – $12,480 |
12’x12′ | 144 | $7,475 – $14,950 |
12’x14′ | 168 | $8,710 – $17,485 |
12’x16′ | 192 | $9,984 – $19,955 |
12’x18′ | 216 | $11,245 – $22,465 |
12’x20′ | 240 | $12,480 – $24,960 |
14’x20′ | 280 | $14,560 – $29,120 |
16’x16′ | 256 | $13,325 – $26,624 |
20’x20′ | 400 | $20,800 – $41,600 |
20’x24′ | 480 | $24,960 – $49,920 |
24’x24′ | 576 | $29,900 – $59,800 |
Costs scale with size, but larger decks often offer economies of scale, with the cost per square foot decreasing slightly as size increases due to efficiencies in labor and material usage.
Costs vary based on the design and type:
Deck Design Type | Cost per Square Foot Installed* |
Ground-level / platform | $52 – $65 |
Detached / floating | $39 – $52 |
Elevated | $65 – $104 |
Second-story | $104 – $130 |
Multi-level | $117 – $169 |
Ground-level decks are generally less expensive due to simpler construction requirements, while elevated, second-story, and multi-level decks require additional supports and safety features, driving up costs.
Composite decking generally costs more but lasts longer and requires less maintenance. Here’s a quick comparison:
Feature/Characteristic | Composite Decking | Wood Decking |
Cost per Square Foot Installed | $52 – $104 | $32.50 – $65 |
Lifespan | 25 to 50 years | 10 to 25 years |
Maintenance | Low maintenance | Needs regular maintenance |
Appearance | Many color & grain options | Natural look of wood |
Durability | Doesn’t rot & repels termites | Susceptible to rot and pests |
Composite decking offers a higher upfront cost but significantly lower maintenance over its lifespan. Wood decking requires regular staining or painting and is more prone to damage from insects and weather.
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Process To Get Deck Cost Estimate Report
Here I am going to share some steps to get deck cost estimate report.
