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.

Time is money, so we’re committed to designing and building high-performance sprayers that maximize your productivity on the job. Over 50 years ago Graco invented the first portable airless paint sprayer, and we’ve been innovating ever since. Choose from battery, electric or gas-powered sprayers for the high performance and productivity you need to grow your business and keep you profitable.

Not all people live where they can hire a painting contractor, like you describe. People who live in small towns can only hire painters who have a very small business, and do two or three paint jobs per week. In this case, you do have to be very careful, when you hire a painter, as we have several, in our area, who are out to make a fast buck anyway they can.
Picking exterior house paint colors is a lot different than picking a color for a shirt or a car.  It may help to drive around to observe colors that other homeowners have combined on homes that are of similar size and design as yours.  There are also online resources that provide homeowners with the ability to create virtual makeovers of their home by combining colors together through their software programs as well.
Generally, it will take a minimum of two gallons of paint to cover a room. At the highest end, paint will cost anywhere between $30 and $60 per gallon and come in three different finishes: flat, semi-gloss or high-gloss. Flat finishes are the least shiny and are best suited for areas requiring frequent cleaning. Semi-gloss finishes are a bit shiny but can also be easily cleaned. A high-gloss finish is stain-resistant and easy to clean. Traditionally, living rooms should be painted with a flat finish to allow the paint to stand out. Glossy finishes should be reserved for hallways, and a semi-gloss is best suited for trim. Invest in pre-primed paint whenever possible. This cuts down on time by combining the layering process. Almost any paint job will require a primer, which will cost anywhere from $7 to $15 per can. Primer helps the paint to stand out against the underlayer of paint it's covering, especially if the new paint is lighter than the old coat. You will need at least two cans of primer, if not more, to cover one wall. Here are some paint brands and their average price per gallon:

Home Painter Co

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