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According to most experts there is no way to give a "ballpark" figure for the waterproofing of a basement. This is because moisture can enter the space through a number of ways, and for a wide range of reasons. For instance, some people have condensation problems that lead them to believe there is some sort of leaking in the basement, this is something easily remedied by improving ventilation, and dehumidifying the air using a standard dehumidifying unit (averaging around $250).
For the purpose of this discussion we will consider several ways to waterproof a basement when leaking is the source of the moisture.
Low: $5,000 (sealing)
High: $10,000+ (also sealing)
Cost to waterproof a basement varies greatly by region. Get free estimates from waterproofing contractors in your city.