My drawing room front Window is going to be of around four feet wide. As the width of this room front wall is 10 feet out of which 3'6" will be kept for front entrance door. I am confused whether the sill height of the window should be 6 inches or 3 feet high as sofa is coming in front of it as my drawing room size is 10'0" * 14'0".

The doorway can be a little taller than usual, say 8'-0" instead of the usual 7'-0", but the ceiling can be normal 9'-6" to 10'-0". There are some cases when the pooja space is located on the ground floor and the ceiling is double height and extends all the way to the upper floor. It gives you a chance to use decorative elements through the entire height of wall, and give the pooja area the pride of place and a grander look

ideal floor to ceiling height is 10'.living room size 12'x16' or 14'x20' according to your requirement.

Jaggi, while it depends on the overall depth of the coffer ceiling but as a thumb rule you can leave a safe gap/height of 9-9.5 ft from lower end to the floor. Thanks, Nitin Cornerstone Designs, Bangalore.