The cathedral is a private home, but you can call ahead or just come by and the owner will show you around.
There are no admission fees, but donations are welcome.
Facebook https://www.facebook.com/Cathedral.of.Junk
More information on roadsideamerica.com http://www.roadsideamerica.com/story/7816
Phone +1 5122997413
Address 4422 Lareina Dr, Austin, TX 78745, USA
Coordinates 30°13'7.021" N -97°46'17.195" E