I don't think you can really estimate the cost on a SF basis. If you need a concrete pad, that will be most of the cost. But, my question would be, what is the function? I can understand a birdcage to keep debris out of a pool or hot tub. But, I don't experience a lot of bugs sitting outside, so I am just curious as to what else a birdcage will do. If you have birds in the area, you will have a cleaning issue.
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