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. 
After any areas repaired in the previous step are primed, we apply premium quality paints for a uniform finish. There are multiple finish options, including flat, matte, eggshell, satin, semi-gloss, and high-gloss, and we will have gone over the benefits of each with you beforehand so you can make an informed decision. The time will vary depending on the size of the job, but we will always ensure to work as quickly and efficiently as possible.

Some proposals simply say to paint the walls and ceiling and never specify the number of coats to be applied. If the colors are similar enough, it's possible to get away with one coat of paint and not discount your pricing. No matter how hard you try, tiny, pin-sized air holes will pop exposing the original walls. This may not bother you if you can't notice it, but principally speaking you should have paid your painter less for the work.
I do not mean to come off with an edge, however, this is an article for people hiring low bid, uninsured, one man band painters out to "hustle" a buck. Hire reputable, established companies or hire someone you know or have a strong referral from. If you are arguing over watered down paint, ticky, tacky deposits, buying your own supplies, you have hired the wrong guy.
WOW! I think the guy I hired read this first and I have photos that would make your skin crawl. Bottom line: he got me for $1900.00. Every single thing he painted had to be completely redone....that's when I discovered he did NOT use the colors I picked, he actually used leftover exterior paint from his mother's house! Because I have pets he said things needed to be sealed first and I did agree to that. What I did NOT agree to was using some kind of foul smelling gray stuff ON MY HARDWOOD FLOORS! THEN he painted them BLACK, telling me that all they were good for was covering over with laminate or carpet. He also dripped and tracked paint all over my ceramic tile floors. PLUS left a wet used paint roller in my garden window and had stuff piled in front so I didn't find it until it had dried. I have no idea how much that is going to cost to repair. Then he left without finishing (thank God) but left the "leftover" paint, uncovered, in the rain. Again, hid it so I didn't immediately find it. Obviously we will be going to court but I doubt if I see a penny from him.

PSA: Color psychology is a thing. The right soothing hue can work wonders for your mind and soul. You might think that only works for pale blues, but the contrast of a light and dark color — or, in this case, off-white walls with chocolate brown and deep blue accents — has a powerful effect. "The darker color grounds the room, and then the lighter runs right up to the ceiling and makes it feel higher. It creates this serene atmosphere," designer Laura Bohn told us.
Not only did they paint our home- they also helped reattach a drain pipe that had partially come off the home, removed a small bee or wasps nest hanging off a side of the roof (this was SO nice of them and totally unexpected), and painted over some railings that were in serious need of TLC but were not included in our quote (we didn't ask for them to be painted when James came to meet with us). David asked my husband first about the railings and only painted them when he gave them the okay- it looks so much better and we appreciated this so much! While the painters were working we also had a termite inspection and contractor come over to look at something in the kitchen- David's team had no problem with this and were very accommodating.
There are permanent features of the home that have their own colors which cannot be changed when painting the exterior of the home but can have a dramatic satisfaction level that is experienced when the painting is completed.  Roofing shingles, paving blocks, concrete surfaces, stones and other such features are prime examples of the colors that should be considered when selecting your exterior color scheme for the home.  Homeowners can work off of these colors to make a home that looks uniform and luxurious when the exterior painting is complete.

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