How Much Does it Cost to Build a Composite Deck?

Are you ready to build a deck that fits your budget? Get a deck material cost estimate with the Trex Cost Calculator tool. Plug in your deck dimensions and answer a few questions to get a quote for the material cost of your new deck. On average, the estimated material cost for a composite deck runs from $21 - $30 per square foot (including substructure, decking, hardware, and fasteners).* Keep in mind, labor costs typically account for about 2/3 of the total cost of your decking project.

Composite Deck Costs by Deck Size

This composite decking price chart provides an estimated breakdown of composite decking costs based on deck size and square footage. It includes essential information on material costs only for various common deck dimensions, helping homeowners accurately estimate expenses. On average, the estimated material cost for a composite deck runs from $21 - $30 per square foot (including substructure, decking, fascia, hardware and fasteners).

*Source: HomeAdvisor "How Much Does it Cost To Build A Deck?" 2022

Deck Size (ft)Square FootageComposite Deck Materials Cost
10 x 10 100$2,100 - $3,800
10 x 12120$2,400 - $4,100
10 x 16160$2,800 - $5,000
10 x 20200$3,400 - $6,100
12 x 12144$2,700 - $4,600
12 x 16192$3,100 - $5,700
12 x 20240$3,700 - $7,200
14 x 20280$4,200 - $8,400
16 x 16256$4,300 - $7,800
16 x 20320$4,800 - $9,600
20 x 20400$6,000 - $12,000
20 x 24480$6,700 - $14,400
20 x 25500$7,700 - $16,300
24 x 24576$8,140 - $17,000

Four Factors That Impact Deck Pricing

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The size of your deck makes a big difference in pricing. It helps determine the materials and labor costs needed to build your deck.

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The design, shape and chosen product line for your deck will affect material and labor costs depending on its complexity and price point. 

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Decking materials could include a substructure, decking, railing, hardware and any design-based add-ons. Depending on the condition of a current substructure, this can also be a size-able portion of cost.

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Labor and management account for nearly two-thirds of total costs no matter your deck design. We can help you find a builder or you can build it yourself.

 

How to Determine the Labor Cost of Building a Deck

This image shows an overhead view of a contemporary gray wooden deck attached to a house. The deck features a white chair with a pillow, a small table with a plant, and a magazine, creating a cozy outdoor seating area. The surrounding yard is landscaped with green grass and a curved stone pathway leading to the deck. The overall mood is calm and inviting, with a neutral color palette and clean lines.
Consider Professional Rates

If you hire a contractor, your deck size and design (such as a picture frame design, stairs or a multi-level deck plan) will likely affect your contractor’s rate or total labor costs. 

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Choose Wisely

When it comes time to pick your contractor, there are a few factors to consider to ensure the best return on your investment. Discover helpful hints and best practices here. 

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Services and Fees

Common services and fees associated with a professional build include consultation, permits and licensing, site preparation, insurance and the actual labor cost per hour to build your deck. Each professional has their own rates, but keep reading to learn more about estimating labor costs.

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Hire a TrexPro® Builder

Looking for a builder versed in all-things-Trex? Hire a TrexPro® builder. These builders are equipped with talented insight from previous Trex deck projects. Find a Pro near you. 

Labor Cost to Build a Composite Deck

Professional labor costs for deck building vary based on location, size, and complexity. Here's how to estimate these costs to decide whether hiring a professional or DIY is right for you:

  • Labor costs for installing a composite deck typically range from $55-70 per square foot.*
  • This average is based on building a ground-level deck (excluding railing or substructure costs).

Let's explore common deck sizes and estimate the labor costs involved.

*Source: HomeAdvisor "How Much Does it Cost To Build A Deck?" 2022

How much does a 14x20 deck cost?

Labor costs depend on a contractor's specific rates and fees, but a good estimate is $9,000 to $15,000* total on a 14x20 deck. This doesn't account for additional fees and services like a consultation.

 

How much does a 16x20 deck cost?

Follow the same method for a slightly longer deck. Here, we'll be working with 320ft2 of deck area. You might expect professional labor costs around $10,000 to 18,000*. You can see how even a small increase in your deck size can have significant cost implications.

 

How much does a 20x20 deck cost?

The cost of a 20x20 deck can vary greatly depending on materials, labor, location, and additional features. On average, you might expect to pay between $13,000 and $22,000 for a professional installation of this size. It's best to get quotes from local contractors for a more accurate estimate.

 

*Source: HomeAdvisor "How Much Does it Cost To Build A Deck?" 2022


Decking Decisions: DIY Deck Build or Hire a Deck Contractor?

Your choice will affect costs, time and responsibility. We're here to help you figure out what's best for you.
 

If you choose to DIY, the total cost to build a deck typically amounts to less than it would to hire a professional. However, you'll be responsible for buying (or renting) the necessary tools and materials, planning deck dimensions, obtaining building codes and more. Take our quiz to see if you're ready to DIY.
 

If you hire a contractor, you'll save time, energy and money on equipment. You'll also have a trusted partner with extensive building knowledge to help you see your project through. However, you'll need to consider the professional's rate and fees associated with your project. 

 
Explore Trex Academy Find a Builder

How to Determine the Cost of Building Your Own Deck

Two adults are seen from above working on the exposed wooden frame of a deck. One person is using a shovel while the other is nearby, with a red bucket placed between them. The setting appears to be outdoors next to a house, with sunlight casting shadows across the structure. No visible text or numbers are present in the image.
Determine Square Footage

First things first, determine your deck’s square footage by multiplying the length of your deck by the width. Don’t forget to factor in any additional areas like stair landings and odd shapes. 

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Factor in Materials

Gather the Trex® decking and materials needed for your DIY build, including your Trex Hideaway® Hidden Fasteners and railing. 

A digital interface for the Trex Materials Estimator is displayed on a tablet screen. The tool allows users to input deck dimensions and calculate material needs, with visible fields for length and width in feet. The interface shows a total area of 448 sq. ft. and options for deck railing selection. The design is clean with a green and white color palette, emphasizing clarity and usability.
Use Our Cost Calculator

To receive an estimated cost for your materials, use our Cost Calculator Tool. Just plug in your deck dimensions and answer a couple of easy questions. 

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Find Your Building Codes

Keep in mind, there might be costs associated with obtaining your local building codes. To find the latest building codes and procedures for your area, visit your local government website or contact them directly. 

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Stock Up on Equipment

Do you have the tools and equipment you need? If you’re starting without a wood frame, you might need more than you think, but you can often rent equipment from your local hardware store. 

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Keep Time in Mind

Time and energy can be overlooked expenditures. Depending on the complexity of the deck design, expect to spend several weekends with hard (but gratifying) work on preparing the site and building your new deck. 

WANT TO ADD A LITTLE EXTRA?
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Zäune
Händlersuche
A contemporary elevated deck features black metal railings and a staircase leading down to a green lawn. The deck is attached to a light-colored house and decorated with potted flowers along the steps. White lattice skirting adds visual interest below the deck, while outdoor seating is visible on the deck itself. The scene is set on a sunny day with a partly cloudy sky.
Gitter
Händlersuche
A sunlit screened porch features a dark wooden dining table and chairs, accented by large tropical plants in white vases. The setting includes a cozy armchair and side table, creating a relaxed indoor-outdoor atmosphere. Natural light floods the space, highlighting the soft gray flooring and pale blue ceiling. The overall mood is airy and tranquil, perfect for casual gatherings or quiet moments.
Trex® Outdoor Furniture
Händlersuche
A spacious, contemporary two-story house is shown at dusk, illuminated by warm interior lighting. The home features a large wraparound deck, stone accents, and expansive windows, set against a backdrop of autumn trees. The manicured lawn and landscaped garden beds enhance the inviting atmosphere. The sky is clear, adding to the tranquil, suburban setting. No visible people or text are present in the image.
Trex® Außen-Terrassenbeleuchtung
Händlersuche

Building within a budget?

  • Do it yourself or hire a deck builder in the off-season to save on installation fees.
  • Opt for straight sections of decking and stairs over more complicated curved designs.
  • Creative design and decor, like a mix and match color scheme, will add style without increasing costs.
  • Look into financing options to put the luxury deck you want within reach.
  • Get more use out of your space with efficient features like outdoor storage solutions.
Estimate Deck Costs

*Average price range excludes Trex Signature® decking, our luxury decking collection. Trex actual material costs and install costs can and will vary based on geographic area, site location, seasonality, design complexity, whether the product is stocked locally, and additional features such as stairs, angles, curves, lighting, etc. For most professionally installed projects, materials constitute up to one third of the total cost.

This content was partially or fully generated by AI and has been reviewed by our team to ensure accuracy and relevance.

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