Check that the sump basin has a cover that keeps out dirt and debris. A good pump will last about seven to ten years. This is especially helpful if you have an unfinished basement. Sump pumps are a common solution for wet basements. New Sump Pump Installation Cost: The cost of a new sump pump installation can be high. However, this is not always possible. To determine whether or not it's running properly, you'll need to check out its float. Your pit should be at least 22 inches deep. Use a wrench to screw the male adapter onto the discharge pipe.