1 BHK will always stay 1 BHK, but sometimes there is need to create room for growing family. Solution is to move kitchen. In city like Pune many homes have Pantry like area, this is a small space meant to be used as store room. That’s your option then, your kitchen goes there.
The other options is to combine WC and Bathroom. This creates space for a small kitchen. Your kitchen will be small, just enough to hold cooking Platform, dining and other amenities has to be adjusted in other area.
However this will give you one more room. New room that gets created will probably be small in size but that’s the best way to satisfy your need. In Mumbai, I have seen many homes where balcony area was used up for making Kitchen, this may not work in everyone’s case though.