How do you calculate the painting expenses for a Living Room in Winterthur, including ceilings, 1 doors, and 2 windows, measuring 6m x 9m?

Meticulously calculating the painting expenses for a Living Room in Winterthur, including ceilings, 1 doors, and 2 windows, measuring 6m x 9m, costs around CHF 844.00.

*) The calculations are approximate, based on a room height of 2.4m, and include one coat of paint. The price covers only the labor, excluding any services or materials.