During the main part of a badminton doubles rally, every part of the court is in. However, the serve must fall into the 'short and fat' area diagonally opposite the server. The side tramlines are in,...
The same court is used for both, but: During singles the side tramlines are out at all times. During doubles the rear tramlines are out on the serve only. For a diagram and further details see the...
If you mean just what area of the court counts on a service then that is a doubles match otherwise for for the entire court: From what i know a singles match is narrow and long and a doubles match is...