Generally speaking, a gallon of paint will cover about 350 square feet. If this is the first time drywall is painted, it will soak up more paint. And remember to factor in whether your job will require one or two coats of paint. Dark and bright colors will require more coats of paint, as will painting a lighter color over an existing darker color. Divide the paintable wall surface by 350 to determine how many gallons of paint you will need to buy. If there’s an odd number with less than .5 leftover, round down, if it’s over .5 round up.
Even if you think you'll probably do the job yourself, it's good preparation to seek estimates from professional exterior home painters near you. Then you'll have a financial point of comparison and you may benefit from what a home painting contractor has to say about the condition of your home, color choices and types of paint available. Let the painter make his pitch for a professional job before you decide what to do. You can still opt to do it yourself while having learned something worthwhile.
If you’re considering adding fresh paint to the exterior of your home or garage, don’t worry about vinyl siding: it can be painted! Be sure to start with clean, dry siding (this may require pressure washing and good weather). Or, you can wash the siding with soap and water instead. But the main thing is to start with a clean, dry surface so the paint won’t peel. Be sure to select a color for the paint that’s not darker than the existing vinyl color: a darker shade will allow the siding to heat up more than it was designed to withstand. House Painting Thornton