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.
Plan the schedule. Get a grip on the time it will take to bring the project to fruition. Plan for time to move furniture, wall prep, cut in, the painting itself, eating and breaks, and don't forget cleanup and bringing furniture back in. As you plan, err on the side of prudence. Unforeseen events will slow you down, so allow time for these. Remember, this is a multi-day project. Don't try to fit too much into a day. If you move faster than planned, great!
Painting interior walls does not require professional aptitude, but it is still a skill that arrives with a learning curve. The most challenging part of any interior painting project is the prep work, which often involves cleaning the walls, masking off windows, doorways and baseboards, then carefully “cutting in” the paint around the edges. Once the masking and cutting in are finished, volunteers with handheld or roller brushes can usually fill in the rest of the space with little trouble.
Decorating a house is a fun but important activity. It is important to make sure the curtains match the walls and the walls match the furniture. Earlier, all interior walls were painted in the same color, and in the same way. Today however, we get to have more fun with colors and textures. It's possible to create a fun effect on your walls using a sponge or even crushed tissue. You may want to paint one wall a different color from the rest of the room. You get to decide what colors you want to use, and how you want them to look on your wall. If you really want to decorate your entire home by yourself, you can even try painting your house by yourself with these 5 easy steps.
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. 
Painting is one of the quickest and easiest ways to give your home's interior a facelift with dramatic results. Fortunately, it doesn't have to be that difficult. Home improvement stores offer samples that you can take home. With these samples, you can try a few colors in large swaths on your wall to see the how the paint interacts with the room's natural light. Compare it against design elements like pillows or furniture to see whether it will work with your overall décor.

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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