Thank you for visiting All Around House Improvements online. The cost of including a deck to your home varies broadly. All the things depends upon its size, and how many bells and whistles you want added, like built-in seating, multiple stairs, built-in flower pots, and the dimensions of the deck. Decks can cost anyplace from $1,200 to $10,000, or more. Once more, it all is dependent upon the design and supplies used.