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Directory of Pressure Washing Services. The following cost information is intended to be general information. If you are looking for an exact cost for a pressure washing service, you need to contact a professional in your local area. What is the average cost of a pressure washing a house? The average cost of pressure washing a house ranges from $250 to $450 depending upon your geographic location and the size of your home.
The average residential water supply in my market is 5.5gpm. So, when you see a power washing contractor that has a water tank, it's likely a buffer tank, NOT just water to be used on a specific house. For an average 1500 square foot house, you will use between 350-500 gallons of water. The wear and tear on your vehicle to carry 500 gallons of water is immense, not to mention additional fuel costs for hauling 4,000 lbs behind your truck in water alone. Water usage rates in my market are .004 cents per gallon.