Pressure WashingIn Portland.

Southwest and West Portland’s mix of older Craftsman homes and newer infill means driveways and siding age differently block to block — a shaded driveway under mature trees collects moss much faster than one that gets full sun most of the day.

Pricing depends mainly on square footage, surface type, and how much buildup there is to remove — a driveway with years of moss growth takes more time than a lightly dirty one. Oregon’s wet climate means moss and algae buildup is a bigger factor here than in drier parts of the country, which is part of why pressure washing tends to matter more for PNW homeowners than a one-time cosmetic fix.