A one-wall handball court has a wall 20 feet ( 6.1 m ) wide and 16 feet ( 4.9 m ) high .
American handball is played on a court 12.2 meters long by 6.1 meters wide ( 40 feet long by 20 feet wide ) with either a single ( front ) wall , three walls , or in a fully enclosed four-wall court ( the most common ) .