Lumber is about half of what I paid now, I built this at the height of the lumber prices. I would estimate approximately $500. The whole project took a couple of weeks working in the evenings. I have a video of start to finish on my channel. Almost a week was spent digging it out, with a shovel, and leveling it. That’s 2-3 hours in the evening, is all the time I had available each day.
It’s an above ground pool waterfall hidden in a planter. In the video, I have it mounted on the floor joist, while I was finishing the deck. You can see what it looks like before I put it in the planter.