Professional roof cleaning typically costs a fraction of what you’d pay for roof replacement—often saving homeowners thousands of dollars. In Crozet, where median home values exceed $500,000, protecting that investment makes financial sense. A roof replacement can easily cost $15,000-$30,000 or more, while cleaning extends the life of your existing roof for years. Many roofs that look like they need replacement actually just need proper cleaning to restore their appearance and function. The key is catching problems early. Once algae and moss cause structural damage or significant granule loss, cleaning alone won’t fix the underlying issues. But when done as preventive maintenance, cleaning can double your roof’s lifespan.