Generally speaking if the basketball unit is within your
property zone then there really shouldn’t be any need for a
permit. It all depends on the law in your area.  Problems
usually occur if the neighborhood kids drag their portable hoop
into the street and start playing basketball on the road. This
blocks the road and in many cases infuriates the neighbors who
may take legal action.  Some neighborhoods may require some sort
of documentation for the more permanent in-ground units although
this is probably a rare occurrence.  If you want to be sure then
go to your local council office and ask them for more
information.