The 'softball' or 'international' court size was codified in London, England in the late 1920s, at 32 ft (9.75 m) long and 21 feet (6.4 m) wide. The front wall was provided with an "out line" 15 feet (4.57 m) above the floor, connected by a raking "out" line meeting the "out" line on the back wall at 7 feet (2.13 m) above the floor. The front wall also has a "service line" (originally called the "cut line") 6 feet (1.83 m) above the floor with a 19 inch high (48 cm) "tin" acting as a 'net' (originally sheeted with metal in order to make a distinctive sound when hit by the ball). The floor is marked with a transverse "half-court" line and further divided into two rear "quarter courts" and two "service boxes", as shown in the diagram above.
The traditional "American" court for the U.S. game, (now referred to as "hardball squash") is a similar size, but narrower at 18 feet 6 inches (5.64 m). The floor and wall markings differ slightly from the "International" court and the tin is lower, at 15 inches (38 cm) high. However, hardball squash was replaced by softball in America as the standard version of squash and has since almost completely died out.
A "Converted Court" is the result of converting racquetball courts to squash. Racquetball courts are 20 feet (6.1 m) wide and 40 feet (12.2 m) in length, so it is relatively easy to install a back wall, producing a squash court of 20 feet (6.1 m) wide by 32 feet (9.75 m) long.