Driveway surface type
Plain concrete is the cheapest to pressure wash — the surface is durable and tolerates high PSI. Stamped or decorative concrete costs slightly more because contractors slow down to avoid chipping the texture. Pavers add 30–50% on top because the joints need targeted cleaning and re-sanding afterward. Light asphalt driveways are best soft-washed at low PSI to avoid stripping the seal coat — pick Soft wash in the calculator, not the Heavy setting.
Oil stains and heavy organic buildup
Visible oil stains, decade-old mildew, or thick algae require chemical pre-treatment plus a slower wash. That's what the Heavy intensity setting captures — roughly a 40% bump over Standard. If you see large dark patches from a parked vehicle, expect the operator to quote Heavy. For a driveway with nothing visible but the normal grey patina of two years of weather, Standard is the right pick.
Regional cost-of-living
Pressure washing labor scales with regional cost of living more than any other variable. The same 1,000 sqft driveway costs roughly $135 in Atlanta (0.95× multiplier), $200 in San Francisco (1.35× multiplier), and $280 in Manhattan ZIP 100xx (1.40× multiplier). The calculator applies the multiplier from your ZIP's USPS prefix band, so the estimate adjusts automatically.
Sealing is a separate service
Many homeowners ask about sealing after pressure washing. Sealing is a separate trade — typically $0.50–$1.50 per square foot, billed on top of the pressure washing line. It's a year-1 or year-3 add-on, not annual. The calculator does not include sealing in the estimate; if you want sealing, expect a second quote line.
Is it worth DIY-ing?
Renting a pressure washer for a day runs $80–$120 at most home improvement stores, and a residential-grade machine costs $300–$600 to buy. If your driveway estimate is under $200, the rental math is borderline; if it's $300+, hiring a pro almost always wins on time and finish quality. A pro will finish a 1,000 sqft driveway in 60–90 minutes; DIY usually takes 3–5 hours because the technique (surface cleaner attachment, even passes, avoiding etching) matters more than the equipment.
How often should you pressure wash a driveway?
Every 12–18 months is the sweet spot for sun-belt regions where organic growth is fast (algae, moss, pollen). Snow-belt regions can stretch to every 18–24 months — winter freeze kills surface biology, so the spring wash mostly clears road salt and accumulated grime. If you wait 3+ years, surface staining sets permanently and the next wash costs more (Heavy intensity).