Calculate Your Decking Costs Today

Learn about the different cost factors to confidently build a deck that fits your lifestyle and budget.

Start Your Materials Estimate

How Much Does it Cost to Build a Composite Deck?

On average, the estimated material cost for Trex decking runs from $10 - $27 per square foot (including substructure, decking, hardware, and fasteners). But there are key factors that will impact the final cost.*

DECK SIZE

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

DESIGN

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

MATERIALS

Decking materials could include a substructure, decking, railing, hardware and any design-based add-ons. The condition of a current substructure can impact a size-able portion of cost.

LABOR

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

Estimate Materials Cost

How much does a 3m x 4m deck cost?

Factor in the price of the Trex materials needed for 12m²of decking area. Then, use the Cost Calculator to determine how much this will cost depending on your selected decking line. The labour cost for a professional to install a composite deck runs from $170-$210 on average* per square metre. This average is based on the labour cost to build a ground-level deck (not including costs associated with installing railing or a substructure). Labour costs depend on a contractor's specific rates and fees, but a good estimate is $2,100 to $2,500* total on a 3m x 4m deck. This doesn't account for additional fees and services like a consultation.

How much does a 4m x 5m deck cost?

Follow the same method for a slightly longer deck. Here, we'll be working with 20m² of deck area. You might expect professional labour costs to be around $3,400-$4,200*. You can see how even a small increase in your deck size can have significant cost implications.

How much does a 5m x 5m deck cost?

A 5m x 5m deck is a total of 25m² of materials and will likely run you upwards of $4,250-$5,250* for professional installation.

The Trex Difference

Trex decking isn’t just built to last—it’s made to transform your outdoor space into a place you’ll love for years, with less work and more wow.

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Savings That Add Up

While the upfront cost of wood may seem lower, over 50 years–Trex’s top warranty length–on average, a wood deck costs 40% more in maintenance due to frequent repairs, sanding and staining.

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A Deck That Lasts

While wood decks often call it quits around the 15-year mark, Trex is built differently.

Engineered for the long haul, Trex decking comes with warranties ranging from 25 to 50 years, depending on your product line.

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Ready to Calculate Your Deck Material Costs?

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Want to add a little extra?

Trex® Railing allows you to lean into the view without obstructing it.
Conceal rough edges and bridge unsightly gaps with Trex® Fascia a subtle and sophisticated finishing touch.
Trex® OutdoorLighting™ transforms your outdoor space from invisible to inviting, keeping the party going long-after the sun goes down.

Deck Cost FAQs

How much does a 14x20 deck cost?

Labor costs depend on a contractor's specific rates and fees, but a typical estimate for a 14x20 deck ranges between $8,400 and $16,800* total. This doesn't account for additional fees and services like a consultation.

How much does a 16x20 deck cost?

Following the same method for a slightly longer deck, let’s look at figures for a 320 square foot deck. Factoring professional labor costs, a 16x20 deck costs around $9,600 to $19,200**. You can see how even a small increase in your deck size can have significant cost implications.

**Source: HomeAdvisor "How Much Does it Cost To Build A Deck?" 2025

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 $12,000 and $24,000 for a professional installation of this size. It's best to get quotes from local contractors for a more accurate estimate.

Start Building Your Dream Deck

Learn to DIY with Trex Academy

Everything you need to learn how to build your new deck, whether it's tutorial videos, pro-tips or inspiration.

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Hire a TrexPro® Installer

TrexPro® builders are equipped with extensive building knowledge to help you see your project through.

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Find Trex In-Store

Want a closer look? Learn where to buy Trex decking materials and the supplies near you.

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* Source: HomeAdvisor “How Much Does Trex Decking Cost?” 2025

Are you ready to build a deck that fits your budget? Get a deck material cost estimate with the Cost Calculator tool - plug in your deck dimensions and answer a few questions to get a quote for your new deck. On average, the estimated material cost for a composite deck runs from $215 - $265 per square metre (including substructure, decking, hardware and fasteners).*

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