To begin, a floorplan with walls and rooms are required. Floors, ceilings and furnishings will only be calculated if they exist, but are not required. There ar two Calcuations Standards supported, International or German VOB. The International Standard calculates the real quantities with no specific rules.
When you select to Calculate the Room Quantities, the Type Properties if the extension appears:
Once calculated, the full Room Quantities of each room can be displayed and/or edited:
For each element, Sub Areas can also be reviewed, including the locations and sized of windows and doors:
Lastly, below is a partial example of the results when exported to an Excel spreadsheet (without any manipulation):
This extension continues to improve the use of Revit information.