azek decking cost per square foot
1 On average, AZEK composite decking material cost about $9 to $15 per square foot. 2  This is the price for the boards only and wonât include installation. 3  Overall, the cost is going to depend on the collection you choose. As for professional installation, plan on budgeting at least $28 to $39 per square foot. 2  According to this STLToday.com, a Philadelphia contractor charged $34 per square foot to install an AZEK deck.