In the process of constructing houses, room sizes have a tremendous effect on the exterior look and interior traffic of the house. You should have special concern in the size of the rooms you design to build your dream house. To live a harmonious life in the house of your desire, plan it before you start constructing. Calculate the dimension of the rooms in your house in terms of height, width, area.
General recommendations for planning optimal room sizes

Bedrooms – minimum 100 sq. ft to 125 sq. ft with at least 4 foot closet 2 feet deep
Bathrooms – minimum 5 feet by 7 feet to 6 feet by 9 feet
Living Rooms – minimum 150 sq. ft to 250 sq. ft.
Dining Rooms – minimum 120 sq. ft.
Family Rooms – minimum 220 sq. ft.
Confirm the size before construct and once you complete select your furniture and start placing for greater is the importance of fitting your furniture in the rooms.