Manuscript Preparation, Copyediting, and Proofreading
Q. Should I double-space a press release? There seems to be little consensus on this issue, though most releases are single-spaced.
A. The reason some copy is double-spaced is that copy editors need room to write between the lines when they mark corrections. If you’re drafting a press release for someone to edit on paper, double-space it. If it’s the finished copy, single-spacing is conventional.