not sure about cost, but if you are looking at a new installation, the U shape would not necessarily be granted... A permanent dock requires permitting and approval...
I would suggest contacting companies like WaterMark to get estimates, as they can also give you a clear picture of what may or may not be permitted in your location.
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Life is about how much time you can spend relaxing... I do it on an island that isn't really an island.....
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