FIRST: Unless you can stay in business painting 1 bedroom at a time for $500-$1000, which you can't, then you will be taking on several thousand dollar contracts that require thousands in Labor and Materials to fulfill the order. Multiply that by 3-4 jobs at one time or in our case 15-20 jobs at a time, YOU NEED TO TAKE DEPOSITS!!! It is horrible business not to take deposits. There are many jobs where its not possible to get a deposit and that is built into or pricing accordingly. If we are not getting a deposit, there is a finance charge built in, contractors are not banks. If you don't have a good feeling about a deposit, your hiring the WRONG CONTRACTOR. Hire people you know or well established businesses.
If you paint over dirty, oily surfaces, the paint will easily chip or peel off. So before painting, clean grimy areas with a deglosser or heavy-duty cleaner intended for prepaint cleaning. They work well to clean painted, varnished or enameled surfaces to improve the adhesion of the new paint. They’re ideal for cleaning greasy or oily areas like kitchen and bathroom walls and removing hand marks around light switches and doorknobs.
When the homeowner is at the point of hiring a painter, they generally will have colors selected or at the very least a color in mind. I always ask for the colors before I bid a job. Dark colors, high sheen colors and specialty finishes require more labor, this drives price. If its not a color change or I'm going over a similar color I give the pricing option of one or two coats. The best advise I can give based on 25 years in the business is to put it all in writing,colors, brands of paint preferred, when the work can be done, who moves furniture and how payment will be handled. I never get up front money. BTW you most definitely get what you pay for with paint. Higher quality products results in and better looking job. Don't be a cheapskate when it comes to paint or the painting contractor.