Soft washing quotes can vary wildly—from $300 to $3,000+ depending on roof size, siding material, and contamination level. Without knowing what to compare, you'll either overpay or hire someone who cuts corners and damages your home. This guide walks you through the exact criteria that separate a fair quote from a rip-off.
Understand What Soft Washing Actually Includes
Soft washing isn't pressure washing. It uses low-pressure water (usually under 500 PSI) combined with eco-friendly cleaning solutions to dissolve algae, mold, lichen, and stains without blasting away protective coatings or granules from asphalt shingles.
A legitimate soft washing quote should explicitly state:
- PSI range they'll use (aim for 100–300 PSI for roofs)
- Cleaning solution type (biodegradable, roof-safe, appropriate for your region)
- Dwell time (how long the solution sits before rinsing)
- Post-treatment (sealers or treatments applied after cleaning)
If a quote just says "roof cleaning" with no method details, ask for specifics. Low-quality operators sometimes use pressure washing on roofs, which voids warranties and causes costly damage.
Compare Pricing by Square Footage
Soft washing prices scale with the area being cleaned. A typical breakdown:
- Roof cleaning: $0.10–$0.35 per square foot depending on region, pitch, and contamination
- Siding cleaning: $0.08–$0.25 per square foot
- Combined roof + siding: Often a 10–15% discount versus separate jobs
For a 2,000 sq ft roof with moderate algae in most U.S. markets, expect $200–$700. A 3,000 sq ft home's exterior (roof + siding) typically runs $400–$1,500. If a quote is 50% below or above these ranges, dig into why.
Red flags:
- Flat rates with no square footage breakdown
- Quotes that don't account for roof pitch or accessibility
- Prices that seem "too good to be true" (they usually are)
Ask About Travel and Minimum Fees
Some companies charge trip fees ($50–$150) if you're outside their service area, or minimums ($300–$500) for small jobs. This is normal and fair—they're covering fuel and equipment setup.
Request quotes from providers within 20 miles of your address to avoid surprise travel charges. If a company operates regionally but quotes no travel fee, confirm they're factoring it into their per-square-foot rate or total.
Verify Insurance and Guarantees
A professional soft washing provider should carry:
- General liability insurance (minimum $1M coverage)
- Workers' compensation (if they have employees)
Ask for proof before hiring. A $500 mistake becomes your liability if they're uninsured.
Also ask what they guarantee:
- How long does the cleaning last? Most algae prevention lasts 2–3 years on roofs; some companies offer 1-year guarantees
- What if the stain returns? Some offer a free re-wash within 30 days if results are poor
- Coverage for sealers? If they apply a protective coating, confirm the warranty length
Check Turnaround and Weather Conditions
Soft washing requires specific weather. Quotes should mention:
- Ideal conditions: No rain for 24–48 hours after cleaning; temps above 50°F
- Timeline: Most roof + siding jobs take 3–8 hours
- Scheduling: Reputable companies book 2–4 weeks out during peak season (spring/summer)
A company offering to start tomorrow might be desperate or cutting safety corners. Ask why they have immediate availability.
Don't Overlook the Details in Writing
Get every quote in writing, including:
- Square footage of roof and siding
- Cleaning solution brand/type
- PSI and equipment specifications
- Warranty or guarantee terms
- Payment schedule (e.g., 50% down, 50% on completion)
- Start and completion dates
Verbal quotes disappear when disputes arise. Written estimates protect both you and the contractor.
Use a Comparison Platform
Comparing quotes manually across five different companies takes hours. Platforms like Mercoly let you submit details once and receive multiple tailored quotes from trusted soft washing providers in your area, all in one dashboard—saving time and ensuring you're comparing apples to apples.
Frequently Asked Questions
Q: Should I get soft washing done if my roof doesn't look stained? A: Not necessarily. If you don't see algae, mold, or lichen, annual inspections may be enough. Soft washing is preventative if you're in high-humidity areas or have a history of rapid algae growth.
Q: Can I negotiate soft washing prices? A: Slightly, yes—especially for combined roof + siding jobs or if you're flexible on scheduling. However, don't push contractors below their per-square-foot baseline; it signals they'll cut corners.
Q: What's the difference between a quote and an estimate? A: A quote is a firm price; an estimate is an approximation. Always get quotes in writing to avoid surprise charges at checkout.
Compare at least three quotes using this framework, then book with the company that balances fair pricing, clear methods, and proven insurance.