I suggest using Home Designer Pro if you are serious about it. If this is a one time deal, I suggest 20-20 Design.
I know that there is a program, called Ashampoo Home Designer, that is used to create houses, but it's not free. You can download the 30-days trial or purchase it.
I recommend using Home Designer Pro for your issue. It has over 8,000 integrated tools including automated building to assist you in designing your floor plans. Besides that you can go into more details with your house and create blueprints, framing plans, roof plans, and more. A 3D view of your result is also provided .