Painting in direct sunlight or applying paint to a sun-baked surface will make fresh paint dry too quickly. As a result, it won't adhere well and will blister and flake prematurely. So begin painting on the shady side of the house. (If the surface is damp, wipe it dry.) Then wait for sun to move and the other sides of the house to become shaded—or just paint on an overcast day.
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If the point of hiring a well established, experienced, reputable painting contractor is to secure the professionalism and trust suggested to be inherent with that choice, then I would EXPECT that professionalism and experience to include the ability to make the proper and correct calculations for labor and materials for a fixed price quote, and there should be NO reason for the contractor to put the cost burden of their miscalculation on the consumer. House Painting Littleton Colorado