I agree with Jeff below, these prices are far below what I see on the market in the Portland Or. area. When one uses the term "paint the house" what exactly does one mean? Any fool can buy an airless paint sprayer and put paint on a house. New homes built with fiber cement siding paint clean and easily but older homes built with wood require much prep work.
I agree with JHs. If there is no new color on it at all, just talk to the painter about it, if it was an honest mistake (which can happen very easily while painting) your painter should have no problem fixing it. However, in my years of experience, it is not unusual for 2 coats of door paint (good quality) not to cover very well at all. I once painted a red door 7 times, plus a tinted prime coat before I found the door to be a solid color.
This all comes down to the rules.....1. references....does the contractor have them??? I ALWAYS furnish all my prospective customers them....no excuses...2. insurance....again, I always furnish proof....3. Read the proposal carefully...I ALWAYS list materials down to tape used, the brand, the grit of sandpaper, the manufacturer, etc....its INEXCUSABLE to not list all of these items....I am a member of the PDCA, the Painting and Decorating Contractors of America, the foremost authority in the coatings industry and they also approve of what I listed....if you do not follow these guidelines, you will NOT get a job reflective of "professional". Look for the PDCA where any painting contractors are, if they are not a member, RUN!

When you’re ready to tackle your next paint project, we offer an amazing choice of colors from top paint brands, at the best price, and expert know-how to help you do the job right. Start outside by taking an inventory of your siding and trim. If your paint is fading or peeling off your siding, start the prep work by repairing the siding and trim with some waterproof patching compound. Once dry, sand and apply primer. Then, repaint those areas until your exterior looks fresh and clean.
Take and pass your contractor’s certification exam. Like the licensing requirements, the content and format of the exam will vary depending on your location. However, the test will almost always include a comprehensive written section, on top of which you may be asked to describe or demonstrate key skills. Upon passing your exam, you’ll have between 1 and 4 years to complete the process of formally registering your business.[11]
Historically, the painter was responsible for the mixing of the paint; keeping a ready supply of pigments, oils, thinners and driers. The painter would use his experience to determine a suitable mixture depending on the nature of the job. In modern times, the painter is primarily responsible for preparation of the surface to be painted, such as patching holes in drywall, using masking tape and other protection on surfaces not to be painted, applying the paint and then cleaning up.[2]
Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.
Even an old lamp with a bare bulb held close to a wall will make minor cracks, bumps or nail pops jump out. Carmen Toto, owner of C. Toto & Sons in Madison, New Jersey, uses painter's putty or a lightweight spackle for minor cracks and dents; he uses plaster of Paris for dents deeper than 1/8 inch. Instead of the standard tape-and-spackle method for bridging over recurring stress cracks, Maceyunas uses a rubberized spray-on primer called Good-Bye Crack. Damaged wood requires a slightly different approach. "Don't use spackle on wood," says Toto, "because it just won't stick." For damaged trim, he uses painter's putty or a two-part wood filler, such as Minwax's High Performance Filler. Smooth any repairs, bumps, and nibs with a drywall pole sander. For smoother walls and better adhesion, some of our pros sand all previously painted walls regardless of the shape they're in.
To industrial and institutional. I also own and operate a professional painting company of elite painters ONLY 5 ELITE PAINTERS, and pay them good money for being elite. Less is better in my opinion.The fact is this a homeowner and a painting company owner can both be taken advantage of by hustlers and liars and amateurs posing as pros. I have had many laborers tell me they can paint. " Oh yes sir I can paint, I'm a painter of 8 years. Yes sir I can cut a straight line." Some people will say and do anything to get a buck. If yoir on the job to see their rookie mistakes you may have time to save your reputation before disaster ensues and fire them on the spot. As a painting Company owner if your not on the job with your crew at least 3 out of 6 days every week your taking a huge risk of damaging your reputation and losing the respect of your team. Homeowners want to deal with you or the crew boss (jobs site supervisor) not "the painter". Many things I have read are right on. Painters for the most part will milk a clock for all they can and still do a good job. But amateurs will leave your projects in shambles and the only ones to pay for it is the contractor and the homeowners. But an elite painter and crew will try to complete a project as quickly as possible and move on to the next one. They understand bonuses, incentives, and promotions. My company provides the opportunity for a homeowner to meet each member of the crew and shake there hand on day one. There is also a differentiation between the crew boss and the crew by the uniforms they wear. Should the homeowners have any issue at all they know exactly who to go to to get results. This eliminates the age old problem of who screwed up? I have found that by me putting on my whites and giving my crew the opportunity to out do themselves on each project it ignites competition, pride in skill, and excellent commraderie amongst the team. We all hold each other accountable. Choose your contractor by the crew not the owner. The crew is a direct reflection of the Company owner. No room for rookies on fine finish painting. Go pro for painting and you won't regret it. With that being said homeowners should always remember that you get what you pay for. With paint and services. In most cases it will be well worth a few extra bucks to get elite results. Never go with the cheapest bid there is always a reason why it's so low.
We were performing some remodeling in conjunction with the painting project and Henry's crew was able to work with and around our contractor with ease.  Henry's crew was ahead of schedule, so they were able to start our project early (nearly a week ahead of schedule) and ended up finishing the project the day they were originally scheduled to start!  
My wife and I just painted the interior of our house with about 6-8 gallons, of $30+ per gallon (meaning the good stuff, non-diluted) with absolutely fantastic results. However we just paid an average of $5 per gallon. Reason...all big box stores have paint, set aside, that has been mixed but not picked up by the customer. They need to sell it quick and if you're not in a hurry (you know well in advance that a room or two need painting and it's not like the roof leaking and needs an immediate fix) you can go to each store when you need other supplies or food, like Walmart (when convenient, driving 20 miles to each is not worth it) and over the course of a month or two, pick out some very nice colors of quality paint. We found perfect colors...not saying they were our first choice but when we opened the can, very nice and some even better than our original picks. Cost to paint the entire house was about $100, with all materials included, period. We had it on the market for a few months to sell, didn't sell, painted the rooms, got 2 offers the day after we finished, took the best one and never looked back.

Home Painter Company

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