I need to add a receptacle outlet to an existing line. I will run the line from an existing receptacle outlet. Is it okay to locate the new outlet below an existing window?
I just realized after commenting this is a very old question I referenced NEC 2017 below but this info has not changed in decades tried to edit but two slow.
If there is a wall below the window this space is included in the distance between outlets and depending on other outlet locations one may be required under the window (think picture window) dmoore is correct that the NEC is ok with outlets under a window and may even require them.+
note NEC exhibit 210.26 shows a fixed glass panel 2' wide with an outlet (any space greater than 2' requires an outlet). 210.52.2 specifys the space measured along the floor and around corners unbroken by doorways , and similar openings...