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.
As a painting contractor I find that most contractors charge between $20 an hour and $45 an hour plus paint and materials pending overhead here in Pennsylvania i figure $30 an hour is a safe bet. figure a good painter should be able to prep a 12 x 12 to a 12 x 15 room, caulk, apply 1 or 2 coats to the ceiling 2 coats on the walls and 1 coat on all baseboards, trim, doors and crown moulding in an 8 to 9 hour day. This is with minimal or minor spackling repairs like nail holes and nail pops, not cracks and peeling tape. Thats extra paint is usually  $30 to $70 a gallon pending quality. A room this size will need 1 gallon for the ceiling 2 for the walls and maybe 1 gallon for the trim, doors ext... the square foot price is $1.50 - $3.00 as far as asking for money up front I never ask. If the home owner buys the paint there is no need for money and if your buying the paint and your an established contractor you have an account with your supplier's.  any ways that's my input and guidelines 
I've seen this done many years ago by a guy who did all sorts of jobs where I lived. My dad caught him painting his boss's roof and he was watering down the paint. We've had a hard time trying to get a painter for our house. We've had a guy that had been remmended by a neighbor and he hasn't showed up to paint for 2 weeks. I want to call him and my husband says no. I'm 69 years old and I'm about ready to go and paint our 2 porches, I've painted all my life and all the inside of our home. Maybe that's the way it should be with everyone that can paint pretty good.
When selecting a color scheme for the home’s exterior homeowners can choose color options that will correct flaws that they may feel exist with their home and property.  Some examples include utilizing two shades of a single color to make a home appear appropriately sized when the home may be too large or too tall.  To accomplish this effect individuals will want to place the darker tone on the upper level of the home’s exterior.  Smaller windows can appear more proportionately sized by trimming them in a lighter tone of paint.  Darker colors make a space or feature appear smaller.  The same effect can be obtained for homes positioned further away from a curb.  By using lighter tones the home will not feel camouflaged.
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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:

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