NEC 210.52.A.2. A common height for a wall outlet is between 12 to 16 inches to the bottom of the device. In rare instances, outlets are still installed in baseboards and in the floor with proper box/covers. When I had my new room built onto my house, the electrician used a standard claw hammer for the height.
Also asked, what is code for electrical outlet spacing?
A receptacle outlet must be installed in every kitchen, family room, dining room, living room, sunroom, parlor, library, den, bedroom, recreation room, and similar room or area so that no point along the wall space is more than 6 feet, measured horizontally along the floor line, from a receptacle outlet [210.52(A)] (
How far do electrical outlets need to be apart?
In the U.S. the National Electrical Code says: In Entries, Hallways, and Habitable Rooms no point on the wall should be more than 6 feet from a receptacle. So going around the room you need one at least every 12 feet, and you need one within 6 feet of a door.