After you have done the multiplication, subtract about 40 sq feet per window, and about 60 sq feet per door. Divide by 400 (interior paint covers 400 sq feet per gallon). The number that remains, is how many gallons you will need. If doing multiple wall colors, then you should do this process for each room (or sets of rooms) with a particular color. 
House painting is often an important step of the moving process. If your home or rental property is in need of a fresh coat (or two) of paint, you’ll have to decide how you want to proceed. Do you hire a professional painter or break out the ladder and purchase the exterior house paint yourself? Depending on the scale of the project, your time frame, and whether it’s an exterior or interior house painting job, the answer might be different. Read up on our house painting tips and tricks to see what choice is the best for you.

After you have done the multiplication, subtract about 40 sq feet per window, and about 60 sq feet per door. Divide by 400 (interior paint covers 400 sq feet per gallon). The number that remains, is how many gallons you will need. If doing multiple wall colors, then you should do this process for each room (or sets of rooms) with a particular color. 
Most of a projects price is the cost of labor at $25 to $75 per hour. However, most contractors bid out based on the entire project which includes all work hours. Hourly rates are only useful if your pro asks to do the job as “time and materials.” However, be wary of this pricing structure, it usually shows the contractor is uncertain how long the project will take.
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