Cost to build a basketball court?

It will be quite expensive. I would guess somewhere around 500,000 ~ 2,000,000 . . . . .

A Utah contractor says that in his area, a home gym built under the garage (as part of the construction of a new home) would cost $25,000 to $30,000. http://www.theplancollection.com/house-plan-related-articles/Plans-with-Indoor-Basketball-Courts_