Charging iPad with Extension Cord

Follow the basic saftey precautions you always should with an extension cord: make sure that the iPad charger is completely plugged in, make sure that the cord isn't pinched under furniture or lying about where someone might trip on it, don't overload the outlet.

yes most your outlets are basic just extension cords running inside your walls

Rudegar is correct. It's fine. I use them and I also use a USB extender cable all the time.