That's a tall order on design dilemmas, is there a particular aspect you need advice on? Right now, my best advice is to find and hire a designer. While we can offer tips, a full design is a very thorough and detailed process. I highly recommend this book to help you move through this process: How To Design Your Perfect Interior http://amzn.com/B009F5EYOE

Posting a program (detailed space allocation) and your budget for construction will help your discussion. Also a site plan. Without these items a designer has nothing to work with.

For your office , you can go for the right side second entry from the main entrance of your house. This way you can make a full glass, sound proof, no disturbance and a comfortable in house office . you can have one more entry from inside for the easy accessibility for the personal use. In your dining area,there's a door leading to the balcony. Make it a 3 track glass door for the good daylight and a natural view from your hall also. In the kitchen, make your washing area of the size 10'8"x 4' . This way you get two perfect rectangle for a perfect planning for the kitchen as well as the washing area for utensils and washing machine.

Hello, I jut saw your comment. thanks for the same. Appreciate your suggestion. Could you please help me to get some construction engineer who can help me to design my ground floor which is about 4 ft underground where the floor and ceiling are already there. The side walls are also there. Only thing is the partition wall to be created to make as a single bedroom house. At present on the east side there is a garage and on the north side a room with toilet. We would like to convert this as a proper single bed house. Since I have a very low budget, can you please suggest how to go about it. Thanks and look forward to your advise.