Determine the coverage area for each color and estimate the number of gallons you'll need for each. For odd walls with angled ceilings, make your best guess. If you're not comfortable doing this, measure the wall at its highest height and multiply that by its width. Now subtract the lowest height from the highest height, multiply that number by the width, cut that answer in half, and finally subtract that new number from the original height by width. That should give you the wall area.
Whether you decide to do the preparation work yourself or have a professional do it as part of your project, proper preparation makes all the difference in creating a smooth and lasting finish. Do it correctly the first time or you’ll quickly end up spending more to fix peeling and chipping paint. Follow this process before starting on your home's exterior. Keep in mind that the process may vary based on your siding materials:
Get estimates from several contractors, request and contact references, search for complaints at the Better Business Bureau[12] and check that the company is properly bonded and insured, as well as licensed in your state[13] . Only pay a small deposit, and don't pay the entire amount until the job is finished to your complete satisfaction (both painting and cleanup).
Even if you hire a professional, you may need to play a small role in your house painting process. This could be anything from moving your furniture to the center of the room to removing switch plates and outlet covers. Ask your painter how much prep work is expected of you before hiring. The amount of work you’re willing to do could help you narrow down the right painter for the job.
Similar to exterior mold, mold is more likely to emerge in warm and humid areas. That being said, rooms like bathrooms and basements are more prone to mold. To preemptively prevent mold, use paints that are mold resistant. Should you find mold on a wall in your home, you can clean it with a simple solution of one part bleach to four parts water. If the area is large, you may want to leave the cleaning to a professional.

Each type of siding will need to be treated differently when it comes to primer and paint at different price points. Exterior paint costs between $35–$80 per gallon depending on the quality you choose. It’s not always true that the more you pay for your paint, the longer-lasting your paint job will be, but you do need to be careful when researching exterior paints to make sure it can weather the local elements well.
Your homeowner’s association might limit you as to how unique you can be with your exterior paint choices. Check with them first to make sure you don’t have to redo your hot-pink-plus-unicorns murals. It can help to drive around your neighborhood to see what your neighbors have chosen and come up with a color scheme that fits in. If you’re not sure, stores can give you small cans of paint so you can paint patches of color in discrete parts of the exterior to see how they look before purchase.
When determining the total cost of a home’s exterior project, you’ll want to include things like the trim, a garage, foundation, windows and doors. All work is calculated by square footage and sometimes by the linear foot, such as in the case of trim. Your contractor will give you a price for the entire project unless you specifically ask for each item separately.
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