I am adding a small powder room under the stairs in an 1890 Victorian home. I have an updated, grounded power outlet about 4 feet from the room that is on the main floor circuit.

Can I tap into the power outlet to draw power to the powder room? I will just have one light and one GFI outlet in the powder room and I do not have an available 20 amp circuit to dedicate to this small half bath.

Thanks for your help, experts!