Power washing a roof can restore curb appeal, remove algae and debris, and extend roof life, but homeowners often ask: How much does a roof power wash cost? This guide breaks down typical price ranges, the factors that influence cost, what to expect from contractors, and practical tips to save money while protecting the roof.
| Service | Typical Cost Range (US) | Notes |
|---|---|---|
| Soft Wash Roof Cleaning | $150 – $600 | Safer for shingles; common for asphalt roofs |
| Pressure/Power Wash Roof | $200 – $1,000+ | Higher risk; used sparingly on durable surfaces |
| Commercial/Steep Roofs | $500 – $2,000+ | More labor and safety equipment required |
| Moss/Algae Removal Treatments | $100 – $600 | Often combined with cleaning; preventive treatments raise cost |
How Much Does Roof Power Washing Cost
Typical residential roof power wash cost varies by method and roof complexity. Soft wash services for asphalt shingles commonly range from $150 to $600 for average single-story homes. More intensive pressure washing or large, steep roofs can push costs to $1,000 or more.
Local labor rates, accessibility, and whether the job requires scaffolding or safety harnesses strongly affect price. Many contractors price by square footage, roof pitch, and the severity of staining or biological growth.
Factors That Affect Power Wash Roof Cost
Understanding cost drivers helps homeowners estimate expenses. The major factors are roof size, roof material, roof pitch and access, cleaning method, severity of stains or moss, and local labor rates. Each factor can increase or decrease the final price by 10–100% depending on conditions.
- Roof Size: Larger roofs require more time, materials, and equipment.
- Roof Material: Asphalt shingles, metal, tile, and slate have different cleaning requirements and risks.
- Roof Pitch and Access: Steeper roofs and multi-story homes increase safety needs and labor costs.
- Cleaning Method: Soft washing uses chemical cleaners and low pressure; power washing uses high-pressure equipment and can be riskier.
- Extent Of Contamination: Heavy moss, lichen, or oil stains require more intensive treatment and possible repeat visits.
Soft Wash Vs Power Wash: Cost And Suitability
Soft wash uses low-pressure sprayers and specialized detergents to kill algae and moss, while power wash uses high pressure to blast away debris. Soft washing is typically safer and often less expensive for asphalt shingle roofs.
For delicate roofing materials, soft wash prevents granule loss and leaks. Power washing may be appropriate for metal or concrete tile roofs, but improper use can void warranties and damage shingles.
Price Breakdown By Roof Type
Roof material influences both the chosen cleaning method and cost. The following ranges are approximate and assume an average-sized, two-story American home.
| Roof Type | Typical Cleaning Method | Price Range |
|---|---|---|
| Asphalt Shingles | Soft Wash | $150 – $600 |
| Metal Roof | Soft Wash Or Low-Pressure Wash | $200 – $900 |
| Tile Roof (Concrete/Clay) | Soft Wash Or Low-Pressure Wash | $300 – $1,200 |
| Slate Roof | Specialized Low-Pressure Clean | $500 – $2,000+ |
| Commercial/Flat Roofs | Pressure Or Soft Wash Based On Material | $400 – $3,000+ |
Additional Costs And Fees To Expect
Beyond the base cleaning fee, contractors may add charges for pre-treatment, heavy moss removal, repairs, warranty options, and disposal of runoff materials. Safety equipment, rental of lift or scaffolding, and travel fees can add hundreds to the bill.
- Pre-treatment or algae inhibitor application
- Moss scraping and manual removal
- Minor roof repairs or replacement of damaged shingles
- Scaffold or lift rental, especially for multi-story homes
- Permit fees in areas with strict runoff regulations
How Contractors Typically Price Roof Cleaning
Contractors use several pricing models: per-square-foot, per-square (100 sq ft), flat-rate by pitch and floors, or by the hour. Commonly, companies charge $0.20–$0.80 per square foot or $20–$80 per square (100 sq ft).
Hourly rates vary, often $50–$150 per hour per crew member depending on region. Always request a written estimate showing the pricing method, itemized costs, and any warranties or guarantees.
How To Hire A Reliable Roof Power Washing Contractor
Hiring a qualified contractor reduces risk and protects the investment. Homeowners should verify insurance, experience, references, and written contracts. Ask for proof of general liability and workers’ comp insurance before work begins.
- Check reviews on Google, Angie’s List, and Better Business Bureau.
- Request before-and-after photos of similar jobs.
- Compare at least three written estimates.
- Confirm the cleaning method and responsibility for potential roof damage.
DIY Considerations And Risks
DIY roof cleaning may save money but carries significant risks, especially for steep roofs and delicate materials. Homeowners who attempt DIY should have proper fall protection, the right cleaning agents, and a low-pressure sprayer. Improper pressure washing can void warranties and cause shingle damage, water intrusion, or mold problems.
For light algae or moss on low-pitch roofs, commercial zinc or sodium hypochlorite solutions and soft-brush techniques can work. Avoid high-pressure washers on asphalt shingles and always protect landscaping from runoff chemicals.
Preparing For A Roof Power Wash
Preparation helps contractors work efficiently and reduces risk. Homeowners should clear the work area, secure pets, and move vehicles away from runoff zones. Notify neighbors if runoff or noise is likely to affect adjacent properties.
- Trim branches touching the roof to allow full access.
- Cover or remove fragile rooftop items and satellite dishes if requested.
- Ensure clear access to water sources and electrical outlets for equipment.
- Discuss chemical use and environmental safeguards with the contractor.
How Long Does A Roof Power Wash Take
Time depends on roof size, complexity, and method. Most residential jobs finish within 2–6 hours; larger or heavily contaminated roofs can take a full day. Soft washes often require dwell time for chemicals to work, so drying and rinsing extend total job time.
Contractors may schedule follow-up inspections or recommend periodic maintenance every 1–3 years depending on local climate and biological growth rates.
Cost-Saving Tips Without Sacrificing Quality
Save money by bundling services, choosing off-season scheduling, and maintaining the roof to reduce buildup. Always prioritize reputable contractors over the lowest bid. Routine maintenance and preventive treatments are often more cost-effective than frequent deep cleans.
- Bundle gutter cleaning and roof cleaning for discounted combined pricing.
- Schedule work during shoulder seasons when contractors have lower demand.
- Ask about long-term maintenance plans or loyalty discounts.
- Remove debris regularly and address minor moss early to avoid heavy buildup.
Frequently Asked Questions
Is Power Washing Bad For Shingles?
High-pressure power washing can damage asphalt shingles by stripping granules and forcing water under shingles. Soft wash is the recommended alternative for asphalt roofs to avoid damage.
How Often Should A Roof Be Cleaned?
Frequency depends on climate and nearby trees; typical cycles are every 1–3 years for areas with heavy algae or moss. Homes in dry, tree-free areas may need cleaning much less frequently.
Will Roof Cleaning Remove Moss Permanently?
Cleaning removes existing moss and, when combined with chemical treatments and zinc/copper strips, can significantly slow regrowth. Permanent prevention requires physical fixes like trimming trees and installing preventive metal strips.
Does Home Insurance Cover Roof Cleaning?
Most homeowner insurance policies do not cover routine maintenance like roof cleaning. Coverage typically applies to accidental damage, not preventive services.
Resources And Next Steps
Homeowners should gather multiple estimates, verify insurance, and ask for written guarantees on workmanship. Choosing the right method—soft wash for shingles or low-pressure for tile and metal—protects roof integrity and provides the best value.
For an accurate estimate, measure roof square footage, note pitch and access issues, photograph problem areas, and request itemized quotes from local, insured contractors who specialize in roof cleaning.