In this layout design, I tried to preserve the main house building as much as possible, leaving the outer wall and the center structure as it is.
One major change is the staircase, I reversed the direction (going upstairs from kitchen area instead of directly from the entrance) for more privacy and optimize space use on the 1st floor. With the new staircase direction, the 1st floor can have 1 master bedroom and 2 bedroom with bathrooms.
As soon as you enter the house, you are welcomed with a wide open space between dining area and living room, also with open access to the kitchen. In the corner of the house there is also a study / work room which can be converted into guest bedroom whenever needed.
On the first floor, I focus on the main house to contain the main bedroom / bathrooms, so we don't need to extend the house too much to the garage side area to save cost of building and insulation. I removed the existing front balcony facing to the main street for a more simple house exterior design. In the proposed layout, the first floor do not extend to the garage. However, you can also use this space for a wide rooftop terrace if you prefer to.
