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. 
As an owners rep and former estimator for a gc i do expect to pay a reasonable deposit say 10 percent and then weekly progress payments. I am asking the painter to book his time and to do the work on my schedule. Most painting companies are not huge operations they will pay their staff weekly. For most repaints i ask for one tinted primer coat and one finish coat for 100 percent coverage. New work gets one tinted primer and two finish coats for 100 percent coverage. The cost of the paint is not really that different for colors or finish. Brands like european fine paint and C2 are more expensive than Ben Moore and sometimes more difficult to roll based on their consistency. Some home depot brands are as expensive as the Ben Moore and of equal quality others aren't. Red paints are notorious for number of coats required and special priming requirements.

The Lead Renovation, Repair and Painting (RRP) Rule establishes requirements for firms and individuals performing renovations, and affects contractors, property managers, and others who disturb painted surfaces.  It applies to work in houses, apartments, and child-occupied facilities (such as schools and day-care centers) built before 1978.  It includes pre-renovation education requirements as well as training, firm certification, and work practice requirements.  

Painting Contractor

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