Cost to Build a Composite Deck: Deck Pricing Trex The cost of a Trex<sup>?</sup> Deck: Let's Crunch Some Numbers. The estimated material costs for a composite deck run from $11 - $15 per square foot, that's including substructure, decking and fasteners. But only Trex composite decking is worth every cent. That said, the average cost of a Trex deck varies, which is why we built a tool to gather estimates tailored to your deck size, materials, railing options and budget. Estimate Deck material costs
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