On average how much does a boathouse cost?

The cost of a houseboat varies greatly and has many hidden costs. It also depends on several factors such as the age of the houseboat, the cost of insurance, and how often the boat is taken out into the water. For example, a 20 year old houseboat worth 50 thousand dollars which is kept in the dock costs 600 to 800 dollars a year with an additional 750 dollars for the marina survey.