Roof soft wash: what to charge (or expect to pay)
The typical US rate for roof soft wash is $0.20 – $0.45 per square foot, adjusted for soil level. Below: how the price is built, what pushes it up or down, and how to quote it line by line.
Typical price range
| Soil level | Multiplier | Effective rate |
|---|---|---|
| Light (maintenance clean) | ×1.00 | $0.20 – $0.45/sq ft |
| Medium (typical job) | ×1.15 | $0.23 – $0.52/sq ft |
| Heavy (algae, neglect) | ×1.35 | $0.27 – $0.61/sq ft |
What moves a roof price
Roof cleaning is soft washing by definition: shingles and tiles cannot take pressure. The cost driver is chemistry, not time — a proper sodium hypochlorite mix, surfactant, plant protection and runoff control. Black streaks (gloeocapsa magma) respond well; moss takes longer. Steep pitch and three-story access push quotes to the top of the range. A 2,000 sq ft roof typically lands at $400–$900.
Quoting it in writing
WashQuote prices roof soft wash by square footage with the soil factor built in, applies your minimum job charge automatically, and exports a professional PDF quote while you are still on the customer's driveway. Free, no account, nothing leaves your phone.
Frequently asked questions
How much does roof soft washing cost?
$0.20–$0.45 per sq ft of roof area. A 2,000 sq ft roof typically costs $400–$900 depending on pitch, access and moss or algae severity.
Why not pressure wash a roof?
High pressure strips granules from asphalt shingles and voids most warranties. Soft washing kills the growth chemically at garden-hose pressure.