Whats it cost to build a 16x36 plain deck

Average Deck Cost Per Square Foot The average cost to build a deck is $25 per square foot with most homeowners spending between $4,380 to $10,080 total. An entry level deck with basic materials costs $15 per square foot, while a deck built with premium materials costs $35 per square foot.

I just had a 12x30 done and it cost me 4200 ( I paid way to much shop around)

I suggest you call the store for a quote on that.