How do you determine the precise painting service cost for a Hall Room in Biel, considering including ceilings, 1 doors, and 2 windows, with dimensions of 4m x 8m?

Determining the precise painting service cost for a Hall Room in Biel, considering including ceilings, 1 doors, and 2 windows, with dimensions of 4m x 8m, it turns around a cost of CHF 486.00.

*) 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.