If your own home is like any other, there’s one thing that needs repaired or refinished. The cost of adding a deck to your house varies broadly. The whole lot depends on its measurement, and how many bells and whistles you need added, like constructed-in seating, a number of stairs, built-in flower pots, and the size of the deck. Decks can price anyplace from $1,200 to $10,000, or extra. Again, it all relies on the design and materials used.