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. 
The color scheme that is chosen for the home creates the initial impression that an individual has of the premises as a whole.  Whether complimentary or unflattering colors are selected, the house will gain an identity of its own when the paint is applied.  There are many times that a homeowner misses opportunities to accentuate positive attributes that the home has to offer by failing to choose the best exterior paint colors. 
Third: The contractor buys the materials. We get them at a better rate and customers really don't know what they are getting into by being a material racer. Once again, I'm not referring to the guys that paint a bedroom or 2 a week. Tell the homeowner to go grab 50 gallons of paint, $300.00 worth of sundries and related job cost items and I'd be interested to see how it works for them....IT WILL NOT. And if were talking about people getting taken advantage of here, the paint suppliers with no relationship to a homeowner will 100% GOUGE the customer and completely take advantage of them with pricing. Contractors will pay nearly half the price and will still save the customers money marking up paint 10-15%.

Maybe you've just moved into a new home, and you haven't got around to buying brushes and rollers yet. Perhaps you're worried that your brush-skills aren't that good, and you won't achieve that professional-looking finish that you’re really going for. Handy professionals will turn up with everything they need to get the job done, from ladders and brushes, to rollers and tarps. You just have to provide the interior paint and primer!
The Painter Guide was created by Eric Barstow of PaintingBusinessPro.com and Chandler Zieg of PaintingLeads.com. We come from a vast background in house painting. Our national painting company produces over $4 million in revenue each year and our education and advertising service for painters sells over $1.5 million per year. We’ve literally helped thousands of painters grow their businesses.
We used FHP to paint the interior of our home and  were very satisfied with their work. Joe, the owner, was always available to answer any questions I had. He put up samples for us in each room so we could choose the best color. They prepped the house well and the end product was more than expected! His price was fair compared to competitors. FHP finished the project in a timely manner . He even offered to come back and touch up the paint after we have moved in ! I would recommend FHP for any job!

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.

This was very helpful. I wonder if i would really follow through and check to see if my painter was cheating me. I used a painter I found on Angie's List. This was 5 years ago. He did a great job. I know he did patching only for about a day and a half. We decided on the kind of paint before he started. that is what he used. I don't know if I could stay on top of him and watch him open every can of paint.

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