I have close to 40 k I've seen number ranging from 75 to 150k but I'll ask the Man what he'd charge when he gets here.@GBBUDD Is there anything different that you did that they don't do? Do they recommend bogs etc. I bet it's really expensive to have them do it. Wonder how much for your size of pond they would charge? I sure see how yours is very similar to some of theirs and I wish I would have made mine like yours but too much work for me and what would you estimate yours cost you to build all yourself?