Mohammad. I understand your program. You may be lost in the details at the moment. Please do follow and trust the advice given here by all these people. You are about to embark on a reasonably expensive journey. Get professional help with someone who you can sit down at a table and brainstorm with them your ideas and intentions. There are Architects and there are professional building designers who are members of the American Institute of Building Design (AIBD) who are well versed in projects such as yours. I personally love a design challenge. After 38 years designing homes and special use buildings I enjoy this type of challenge the most. I am in Ohio and may not be close to where you are but I am sure with a little investigation you will find the best design professional for you.

Please send us the Floor Plan / Sqft and other details if you are looking for Exterior / Elevation design . We do creative designs as per client requirement and floor plan. Ghar360. India's leading design firm

The local contractor working in your area will know all about the extensions permissible by DDA. You just need to match the exteriors with the existing elevation of the building.

Hi Ankur, Try and incorporate some semi open spaces you can walk into, a sit out balcony and also check the openings on the external wall ( your master bedroom has a long wardrobe on the external wall, leaving no space for windows for ventilation. Do consider contacting a professional, to have an efficient floor plan with minimum waste of space and optimum ventilation.