**Query**

The table 13.6 in criterion 13 (GRIHA Version 3) has a format requiring to calculate day lit area according to the formula (A=2H x W+2m). Also, total day lighted area is expressed as a product of no. of windows (n) and daylight area (A).

In my current project, the building has the following aspects:

1. Atypical windows

2. Different widths on either side of the window to the nearest wall. Therefore, the formula to calculate day lighted area cannot be used.

3. I have multiple windows in each room. Therefore I have calculated the day lighted area, using CAD, to combine overlapping areas.

How am I supposed to enter these values in the format specified? Is it alright to provide the required details in any other format?

**Solution**

The online Daylight calculator only requests for the areas falling under daylight zone. The same can be calculated on AutoCAD and can be fed in the tool.