A gallon of paint costs $15 to $40 and covers about 350 square feet with one coat. Designer varieties can run over $100 per gallon. Your contractor pays 50 percent less than what it runs in a home improvement store. You’ll also need to spend another $20 to $100 on supplies like brushes, rollers, masking paper and plastic. A professional will have these items on-hand.

I was a professional painter way way back for a company. Now I am dabbling in working around the neighborhood here and there and needed to know how much I should charge. I recently painted an entire home including woodwork / doors / windows/ baseboards and the paint costs $230 ish and I did it free for my best friend . It took me 4 days to do . 7am-9pm . It turned out absolutely beautiful , and every room was a different color .
The price to paint an interior versus an exterior depends on a few factors. For painting an exterior, you will pay about $2,600. This is because you have to account for the siding, making sure the weather doesn't affect the job and dealing with weather conditions. On the other hand, the price to paint a home interior is around $1,700 -- less to worry about other than keeping the flooring and furniture paint-free. If you want to do both the interior and exterior, talk to the painters about any deals or their opinion on timeline and how it affects your budget.
Interior paint itself costs anywhere from $12-$50 or more a gallon, depending on the quality. Painting a 12x12-foot room, both walls and ceiling, can require $25-$100 worth of paint, plus $10-$50 for primer, brushes, rollers, drop clothes and other supplies. For a 1,500-square-foot home, supplies run $200-$300 for average paint, and $400-$600 for higher quality.

I have no workman's comp or liability insuerance, so I charge a little less than the going rate (but not too much less). I an limited to working weekends and nights because of my day job. But otherwise, I try to be very flexible with all my customers. I also explain everything that I can to them about the process, and why certain steps should be taken. 
Tipping house painters is good etiquette. You can base the tip on the size of the crew, and request the amount to be evenly divided. Or, you can leave a tip based on the size of the job and leave it up to the foreman to decide how it is distributed among the crew. Sometimes — especially with big projects — the painters on the job change during the course of the project, so it’s often customary to leave one tip for the whole job.

Don't hesitate to ask all the questions you need to feel comfortable hiring a professional. You can also ask 3-4 professionals to make sure you have the right quote in mind. You must make sure they have a warranty or some kind of paperwork stipulating the quality of their jobs. Insurance is also a #1 priority to consider, as damage can happen in the process of painting.
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