Depending on how you count them, as few as 3. Live in a condo, so that limits openings to front and back (don't even get extra for being on the end of a building). Opening in both bedrooms facing the front, but technically 2 windows in each opening. At the back is a glassed-in lanai that was originally an open balcony. There are also two separate sliding glass doors between said lanai and the living/dining room.