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The cost of Trex decking installation is dependent on several factors. First, decking takes a considerable amount of time and labor. Installation for a 250-square-foot area may cost an average of $8 per square foot; however, prices may be altered when difficult materials and tough-to-reach areas are involved.
Trex Select is the cheapest and lowest grade available. Nonetheless, Trex Select does contain an outer shell that increases resistance to mold and mildew. The color of the decking material and railing can be modified to match your homeâs style.ee the average costs of Trex decking below: 1  The total project cost for a Trex deck ranges from $1,500 to $2,200 for a 250-square-foot deck. 2  Trex Select of basic quality averages approximately $7 per square foot.