Start by thoroughly examining the outside of the house or outbuilding -- not just the exterior walls but under the eaves, around windows and doors, and along the foundation. Look for split shingles and siding, popped nails, peeling or blistering paint, mildew, and rust stains. Once you've identified the areas that need attention, roll up your sleeves and make the repairs.

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When selecting a color scheme for the home’s exterior homeowners can choose color options that will correct flaws that they may feel exist with their home and property.  Some examples include utilizing two shades of a single color to make a home appear appropriately sized when the home may be too large or too tall.  To accomplish this effect individuals will want to place the darker tone on the upper level of the home’s exterior.  Smaller windows can appear more proportionately sized by trimming them in a lighter tone of paint.  Darker colors make a space or feature appear smaller.  The same effect can be obtained for homes positioned further away from a curb.  By using lighter tones the home will not feel camouflaged.

To determine how much paint your house needs, measure the house's perimeter. Then multiply that figure by the height, excluding gable ends. Take the measurements with a steel tape measure, or reel out a ball of twine around the house and mark and measure the twine. If you will use a different paint on your home's trim, subtract 21 square feet for every door and 15 square feet for each typical window. Divide the final figure by the square-foot coverage specified on the can of paint to determine the number of gallons you will need for one coat.
Before the scrubdown, protect nearby plants by misting their leaves and saturating the surrounding soil with water, pulling them away from the house, and shrouding them in fabric drop cloths. (Plants will cook under plastic.) Lay more drop cloths along the base of the walls to collect any falling paint debris. Walls should be wet down before getting scrubbed, then washed with a gallon of water mixed with 1 cup chlorine bleach and 1 cup of either a concentrated, phosphate-free cleaner, such as a trisodium phosphate (TSP) substitute, or Jomax House Cleaner. Working in sections, from the bottom to the top, will avoid streaks. Be sure to rinse walls well before the solution dries. Wood siding and trim should be ready to paint after a day or two of dry weather. http://www.youtube.com/v/b6_WEt9k_Hw&feature=share
Climate is another factor to consider. Sunlight, wind, rain and salty weather can all wear out exterior paint. Oil-based paint is durable against wind, rain and temperature changes, but sunlight tends to degrade it. Alkyd paint chalks and sheds very thin layers when it begins to wear. Latex paint is the more durable option for very sun-drenched and relatively dry climate areas. Latex paint with high vinyl content should be avoided, however. Acrylic resin is by far the more durable binder for outdoor latex paint.
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. Sure, it adds to your the total time and money spent on your project, but it's certainly worth doing the job right the first time. Otherwise, you'll spend additional time and money down the line on maintenance and repairs. To ensure proper preparation, follow this process before painting your home's exterior (keeping in mind that the process may vary based on exterior materials):
^{A fresh coat of paint does not just give your home a brand new look. It also provides protection against pest damage and harsh weather, helps siding last longer, maintains structural integrity, and increases the resale value of your home. Though homeowners sometimes take up the job themselves in order to save money, you cannot beat the quality provided by an experienced professional painter. A professional painting job can increase your home’s curb appeal and transform a dull room into a happy one.}
_{Lap marks are those ugly stripes caused by uneven layers of paint buildup. They occur when you roll over paint that’s already partly dry. (In warm, dry conditions, latex paint can begin to stiffen in less than a minute!) The key to avoiding lap marks  when doing DIY wall painting is to maintain a “wet edge,” so each stroke of your roller overlaps the previous stroke before the paint can begin to dry.}

To win work, contractors generally have to bid against other suppliers. To make an accurate bid, they estimate the time and materials required to complete the job. They measure the area to be painted and discuss the type of finish the customer requires. They assess the quality of the surfaces to work out how much remedial work they must carry out before painting. They might have to remove old paint or wall coverings, or repair cracks and other damage. They also calculate the cost of any essential equipment, such as scaffolding for exterior walls. http://youtube.com/embed/b6_WEt9k_Hw

Consider purchasing supplies personally to save money. Ask the painter for a bid that separates labor and materials. Then explain that you'll purchase the materials and ask for a list of exactly what will be needed to complete the job. Caulking, for example, is an extra supply commonly used to fill any cracks or damaged areas in your walls -- and one that might be overlooked in an incomplete list.
When selecting a color scheme for the home’s exterior homeowners can choose color options that will correct flaws that they may feel exist with their home and property.  Some examples include utilizing two shades of a single color to make a home appear appropriately sized when the home may be too large or too tall.  To accomplish this effect individuals will want to place the darker tone on the upper level of the home’s exterior.  Smaller windows can appear more proportionately sized by trimming them in a lighter tone of paint.  Darker colors make a space or feature appear smaller.  The same effect can be obtained for homes positioned further away from a curb.  By using lighter tones the home will not feel camouflaged.