If well-maintained, a roof deck potentially adds 150% of its price to your home’s real estate value. Installing a deck on your home’s rooftop is a very complex job; the cheapest rooftop deck runs around $25,000, while adding several extra features can break the $60,000 level. However, rooftop decks are a rare kind of home improvement with a return of investment (ROI) higher than their cost. Financing that $40,000 rooftop deck might make your house worth $60,000 more when it sells.