First of all the images you posted you cant make anything out what you got there. Secondly you should contact a local Architect when doing something like this, not only for structural reasons, but window design as well. He will layout window detail based on the window sizes available from a certain manufacturer or you can take his drawings which indicate opening detail to a place who sells windows, and they have catalogs of window combinations and sizes to make it work with what you have.

We have recently finished the two and a half storey structure of bungalow. In the ground floor, there are guest room, kitchen and living cum dining room with a space for upstairs. It is a duplex concept house. Also in the first floor we out master bed room, children's room, parent room, family lounge, study room and a pantry. From the first floor is the gazebo entry with front facing. All the rooms have attached baths and toilets except the study, pantry and family lounge. The second floor has laundry room, spa room and a big prayer room( ibadat khana). Please help to decide on the window and door style and sizes that looks beautiful in such structures. Thanks in advance..... My email I'd is njk_gtk@yahoo.com.

You can have bigger windows in your drawing room. The size can be 6'x6' on both the sides. The sill level can be at 2' if you like bay windows. Add one more window in your dining room. For the bedroom, you'll have to make the furniture plan first .For all the toilets, there must be ventilation at the height of 7' and the height of the ventilation can be 18". In the kitchen its the same as bedroom, you'll have to do the plan first. For more detail planning you can contact me at rupalgshah@hotmail.com.

Regular window size 4width X 4 height floor to window sill 3' kitchen window size 4 width X 3 height floor to window sill 4' if low sill means stove burner of due to air