Depend on where you live, if you are doing it yourself or hiring someone to build it. That being said $75,000 should do 

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Basically I live in a cold place and all I want to do is play but all the gyms cost memberships and have shitty schedules and are over-run with people, so if I want a indoor gym in the future where I can invite all my buddies and have half-court 4v4, 5v5 games, how much could it cost realistically? is it doable? 

How much could it cost to build a indoor basketball gym attached to my house in the future?