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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.
Pressure Washing Costs. 1  Paying a professional to power/pressure wash a basic single level deck with around 250 square feet might cost $150 to $250. Larger decks or those requiring heavy cleaning will cost more; a 20 x 20 foot deck might cost $300 to $400. Expect a minimum charge of at least $100.