For a 12x16-foot raised deck with stairs, it will probably cost about $2,500 in materials. But if you hire someone to construct it for you, you are going to pay $5,000-$7,500. Is it Cheaper to Build Your Own Deck? - Decksgo.com decksgo.com https://www.decksgo.com � is-it-cheaper-to-build-your-o... decksgo.com https://www.decksgo.com � is-it-cheaper-to-build-your-o... For a 12x16-foot raised deck with stairs, it will probably cost about $2,500 in materials. But if you hire someone to construct it for you, you are going to pay $5,000-$7,500.