Per Square Foot, Per Job, or Hourly?
Most pressure washers quote one job number. How you get to that number is what separates a profitable bid from a guess.
Price off measured surface area: $0.15 to $0.30 per sq ft for concrete flatwork (driveways, sidewalks, patios); $0.20 to $0.50 per sq ft for house and siding soft washing; $0.30 to $0.70 per sq ft for roofs. Basic light-soil jobs run lower; heavy mold and algae run higher.
Homeowners want one number. $100 to $250 for a standard driveway, $250 to $600 for a single-story house wash. Measure first so a big surface doesn't blow your number - and always hold a minimum.
$50 to $160 per hour depending on solo vs crew and equipment. Use it for heavy oxidation and rust, multi-stage soft washing, and commercial jobs where the scope is uncertain. Most pros quote by the job up front and keep an hourly rate in their back pocket.