The sizes of bricks used for construction are

1. outer walls will be 9inches(230mm).

1. for interior partition walls will be 4.5inches(120mm).

1. then 3inch(80mm) walls are used for cupboard purposes.
2. And 2inch(50mm) walls will be also be used for cupboard and for staircase railing purposes.

1. Some architects suggest 6inches wall for appearance purposes.

These dimensions are used mostly in every part of india!!!!