basic formula? single color exterior labor only ranges from $0.85 to $0.95 per sq foot as a BASE starting point. Prices go up depending on multiple colors, slope of surrounding areas, multiple stories..etc.Some painters charge per window to mask off. Ive seen $25 a window to $50.  Interiors without flooring can be factored the same way. When you start having to do multiple colors, cut ins, masking, room isolation...etc. the price jumps considerably. I always start with a base of $0.85 a sq foot and figure it out from there. the season plays a major role too. paint and materials are charged separatly and are typically marked up at a minimum of 15%. I always tell clients this. that way they pick the paint out they want and what quality they want as well. Anyways...thats your base. 1250 sq foot home @ .0.95 a ft = $1,187.50 (one color). Pressure washing, Add another $45-$55 per hour. a 1250 sq ft home is not going to take longer than 2-3 hours if its a single story. 
These days, it seems like anyone with a paintbrush and a business card can call themselves a painting contractor. Homeowners who are most likely to be taken in by these unscrupulous “painters” are those who are focused on cost and cost alone. With painting, like anything else in life, you typically get what you pay for. If the painting contractor you are considering cannot answer these ten questions, proceed at your own risk. If they answer all ten satisfactorily, then you know you’ve found a great great professional contractor to work with.
A fellow (actually lives in the same neighborhood) by the name of Wayne Hickey (843-655-0366) painted the ceilings and most of the walls of our house in February 2017. He got paint all over my light fixtures, all over my trim around the doors, and had visible lap marks everywhere on the walls. He came back and rectified some of the problems, but not all, as I have noticed as I have had time to look more carefully at the work he and his assistant did. His assistant had no idea (not a clue) how to roll paint on a wall or ceiling. Some places were not covered. He said he would pull nails for pictures and then re-insert the nails exactly where they were. This he did not do as he promised. He painted over the nails. His assistant had no idea how to use a paint roller. I have painted all my life, and would have done this work myself, but I just had a full knee replacement and the other knee is in bad shape. I just could not do the work. Wayne is a pleasant and congenial individual, but he can not cut in a ceiling or wall to my satisfaction - not even close. He should have a putty knife and wet cloth with him all the time to correct any paint that might get applied where it shouldn't. That is something I always did as a painter. I would not recommend Wayne to paint anybody's home.
In Mark Twain's classic "The Adventures of Tom Sawyer," Tom tricks his friends into painting his aunt's fence. You probably won't get that lucky, but there are good reasons many homeowners keep their painting in-house. No building codes apply to interior decoration; if you do something dumb, you don't risk life and property as you would if you were, say, tackling a rewiring job; and because labor typically accounts for 80 to 85 percent of the price of a paint job, you'll save a ton by doing the work yourself.
Sand the trim with a fine-grit sanding sponge. Sponges get into crevices where sandpaper can’t go and let you apply even pressure. Then apply the first coat of paint, let it dry at least 24 hours, lightly sand it again for a completely smooth surface, and apply the second coat. After each sanding, vacuum the trim, then wipe it down with a tack cloth to remove the dust.
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.
Work with a professional painting contractor. If you haven’t done so already, sign on to work with a painting company near you. As part of a professional team, you’ll learn the tricks of the trade and work in a variety of different environments, both commercial and residential. There’s no better way to accumulate practical experience than to do it on the job.[8]
As you walk through your lighted rooms (preferably day light) see if the new coat has light spots showing the precious paint. This is call "bleeding through". This means that there's only one coat of paint or the paint was diluted or the trasition of colors were from light to dark (or the other way around) and primer was not use or the painter is inexperienced.
A professional painter will help you select an exterior paint designed for long-lasting results, superior protection, and ample coverage. Higher quality paint requires fewer coats and lasts far longer, saving you money down the road. Oil or latex paints in a flat/matte or satin finish make excellent choices for the exterior of your home. These paints will endure extreme weather conditions, can be customized to your specific climate, and are ideal for painting siding.

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