How Long Does It Take to Pressure Wash a House or Deck?
Typical timelines by surface
A standard driveway or sidewalk usually takes 30–90 minutes depending on square footage and how much oil, mildew, or built-up grime has to be broken down first. A full house exterior wash (siding, trim, and foundation) typically runs 2–4 hours for an average single-family home, longer if there's two stories or significant algae growth on north-facing walls that get less sun.
A deck is usually the quickest single surface — 1–2 hours for cleaning — but the full process, including drying time before staining or sealing, stretches the project over 2–3 days, not 2–3 hours. That gap between 'cleaned' and 'ready to seal' is where most DIY timelines go wrong.
Why the drying window matters more than the washing itself
Wood needs to fully dry — not surface-dry, but dry all the way through the fibers — before stain or sealant is applied, otherwise the coating traps moisture underneath and fails within a season. In Chicago's humidity, that's typically 24–48 hours minimum in warm, dry weather, and can stretch to 72+ hours if it's cloudy or the deck doesn't get direct sun.
Pressure washing too aggressively can also gouge softer woods like cedar or pine, which then need a light sanding before staining — another step that gets skipped when people are trying to compress the timeline into a single weekend.
What determines the final cost
Square footage is the baseline, but the real cost driver is condition: a driveway with years of oil staining or a deck with heavy mildew takes meaningfully longer than routine seasonal maintenance, because it requires pre-treatment before the pressure washing itself does any good. Homes that get washed annually are consistently cheaper to maintain than ones that wait 3–4 years between cleanings.
We handle house washing, driveway and sidewalk cleaning, and deck and fence prep washing across Chicago and the North Shore — happy to give you a straight estimate based on your specific surfaces and condition rather than a generic per-square-foot number.
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AfterNeed Pressure & Soft Washing in Chicago?
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