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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.
1 Power Washing, Stain and Seal : $1.00-$2.00 per square foot depending on surface condition, intended outcome (mold/mildew issues), and access. 2  Power washing a deck is good for cleaning the surface but Never use the aggressive pressure of the water as the cleaning factor.