If your roof has black streaks, green moss, or dark patches, you don't need a new roof — you need it cleaned. Here's what roof cleaning costs in New Jersey in 2026 and what goes into the price.
Typical roof cleaning cost in NJ
Roof cleaning ranges widely — from a few hundred dollars for a small ranch to several thousand for a large, steep, or complex roof. There's no flat rate because every roof is different. The big variables:
- Roof size & pitch — more square footage and steeper slopes take longer and more care.
- How much growth — heavy moss and lichen need more dwell time and product.
- Access — landscaping, height, and safety setup.
Why those black streaks happen
The streaks are Gloeocapsa magma, a hardy algae that feeds on the limestone in asphalt shingles. Left alone it spreads, holds moisture, and shortens your roof's life. Cleaning it isn't just curb appeal — it protects the roof you already paid for.
Soft wash, never pressure
The only roof-safe method is soft washing — low pressure plus a cleaning solution that kills the algae at the root. High pressure strips the protective granules off your shingles and can void manufacturer warranties. It's the method the top three shingle makers actually recommend.
Get an exact number
Every roof is different. Gallo Bros gives free, upfront quotes across Morris, Bergen, and all of North Jersey — backed by 800+ five-star reviews. Request your free roof cleaning quote →