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.
If the point of hiring a well established, experienced, reputable painting contractor is to secure the professionalism and trust suggested to be inherent with that choice, then I would EXPECT that professionalism and experience to include the ability to make the proper and correct calculations for labor and materials for a fixed price quote, and there should be NO reason for the contractor to put the cost burden of their miscalculation on the consumer.
The cost to paint a room will vary based on the size of the room, the type of paint you select, any ceiling or trim work needed, and any repairs needed. If no repairs or other additional work is needed, painting a room with contractor-grade paint could range from $1 to $2 per square foot, including materials. Selecting a luxury paint (some cost more than $100 per gallon) will certainly increase your house painting costs. Here are some additional examples of average house painting costs, per room:
It’s important to note that complimentary hues work best with each other when they are of the same value. Referencing the provided color wheel, you’ll notice that each pie wedge is segmented into rings of decreasing size. And the value of each hue changes as the rings get smaller. So, if you’ve decided your kitchen needs to be a pure red (the outermost red), then it’s complimentary color is going to be a pure green (opposite & outermost on the ring).
In most cases, you'll be able to remain in your home during a painting project. However, if you are painting multiple rooms or your entire home it may make sense to stay elsewhere for the duration of the job. If your project involves lead abatement or anyone in your family is sensitive to dust or fumes, you should consider leaving the premises until the job is complete.

I was searching for months for a company to paint our town home. This was a particularly sensitive subject for us since our town home was only a year old, but the paint job was beyond awful! I met with the owners Warren & Heidi and immediately I knew they were the right choice. If you are looking for high quality, perfection, amazing service, trust and a company who serves their customers needs first, Warline is definitely the only option. As a business professional myself, I would never attach my recommendation to any company that didn't meet my extremely high standards and Warline did just that!
We contracted Warline and their team for the interior painting of our new home, as Warren inspired us confidence and professionalism from the get go. We are so glad we did! Not only did they do a quality job, but they pulled it off in two short days, including prep and clean up. Warren always got back to us quickly when we had questions, and we felt like we were in good hands through the whole process. Great value for our money. Thank you!
It's up to you. Outside is much harder because it requires more prep, patience, time, help, money and of course, effort. I have been painting my own houses and rental properties interiors for 20 years, and I painted the exterior of one, once. I then had it promptly done again by professionals who said it would have been cheaper if they didn't have to undo my work first. My advice is to get pros for the outside because everyone will see it.
The cost to paint an average size room (10X12) ranges from $380-$790, not including ceilings, trim or cost of the paint. DIY, this can cost between $200-$300. When estimating the cost, painters will start with how much paint will be required to complete the job. To know this, they first need to know the size of the area to be covered. The easiest way to calculate the size of the paintable area is to add together the length of the wall and multiply it by the width of the room from floor to ceiling. The resulting amount is the room's square footage. This total is a starting point, as it is not all paintable surface. The painters won't paint the windows and doors, for example, and they must account for ceiling trim and baseboards as well. The next step is to subtract the area of the doors and windows -- along with the square footage of the trim and baseboards -- to get an average. Then, use the same calculation (length x width) on the windows, doors, trim and baseboards, and subtract all of those numbers. The result of this equation is the square footage of the room's walls. This is your surface area number. (Painters will typically add a little square footage back in to this amount to account for extra paint, which may be required.)
Hiring a local painter to tackle your interior painting project is the easiest way to get the job done quickly, neatly, and with the best possible results. A painting contractor will provide the right materials for the job and complete any necessary repair and prep work to ensure a beautiful and lasting finish. Whether you're painting the inside of your house to update a single room or to finish off a big remodel, an experienced painting pro will deliver excellent results in record time.
It's up to you. Outside is much harder because it requires more prep, patience, time, help, money and of course, effort. I have been painting my own houses and rental properties interiors for 20 years, and I painted the exterior of one, once. I then had it promptly done again by professionals who said it would have been cheaper if they didn't have to undo my work first. My advice is to get pros for the outside because everyone will see it.

In general, glossier paints are more stain-resistant and scrubbable. But a higher sheen also highlights any imperfections in the wall or in the paint job. "Flat paints are fine for ceilings and formal rooms, but for most of my customers, I recommend an eggshell gloss. It's good for hallways, kids' rooms, even kitchens and baths," says Toto. It seems that latex paints have won over even the most finicky painters. "Though we still use oil-based paints for restor-ation work, latex paints are fine for interior walls and new trim," says Toto, "as long as you don't go cheap on the paint." All of our pros have their personal favorites, but they agree that good paint does not come cheap. "You'll spend $20 to $35 per gallon for a top-shelf paint," says Weeks. The pros also agreed that using two coats of paint will result in the best-looking job. Don't skimp on the coverage; if you're covering more than 400 square feet per gallon, you're spreading it too thin. Also, keep 1/4 to 1/2 gallon on hand for touch-ups.
I put out a request for bids to several local house painters and quite a few seemed high. One was for over $6000 for painting the exterior of the house with putty fill as necessary, paint included. It was for him and one other guy to do the work. I said, "it's going to take you guys quite a while to get this job done" and he told me that no, they could do it in 2 days. I don't know about you but $1500 a day per painter seems more than just a bit high. I went with someone else and they had several people there for several days working like crazy and did a great job. There are too many scammers.
If you decide to paint multiple rooms in your home, choose colors that relate to one another without being completely the same -- unless uniformity is your goal, of course. Costs may vary based on differences in color, gloss and room size. However, each room will flow depending on the trim's color -- which should all be white or neutral -- so they look connected. A whole-house color scheme presents the same cost factors as painting multiple rooms individually: colors you choose, the gloss, the size of the rooms and time/labor. You can choose to use the same color throughout your entire home to save on money, or you can use a color scheme with the same gloss throughout, though this isn't recommended for selling purposes.
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