How much would it cost to build a free standing racquetball court in my backyard?

Question

Using a plain concrete exterior (like most garages).

Answer 1

Interesting Q.

   I suspect a couple factors matter.

Codes and Zoning

Height and width of a decent court and wall

paving the court

figuring out how many cinder blocks/ concrete blocks make up an appropriate size

How much mortar it would take to build

any netting, or blocks to avoid OOOPS in going over a neighbors wall.

How much concrete needed to pour the footers