Wave how is the area of window and balcony calculated

From;  Author:Stand originally
Ask: About wave window and inside the balcony (life balcony) the computational problem of the area, be complete excuse me plan, each plan half, still wave is the window calculated area? The building that because be in,differs dish heard different answer, same building dish different SALES also has different answer, develop the computational method with real business so, or the computational method of standard authority, should be what kind of?

Answer: Generally speaking, wave windowsill arrives the height of the ceiling is little at 2.2 meters, windowsill does not calculate an area; The balcony waves outside (rely on a wall at the same time only) calculate half area; Inside the balcony (have 3 walls) calculate whole area.