Pressure washing restores your home's exterior fast, but hiring the wrong contractor can damage siding, void warranties, or waste thousands. Knowing what separates quality operators from amateurs saves time and money. This guide shows you exactly what to look for, what to expect, and how to compare services in your area.
Why Professional Pressure Washing Matters
DIY pressure washers rent for $50–$100 per day, but at 3,000+ PSI, they strip paint, etch wood, and crack stucco in seconds. Professional crews understand surface-specific pressure settings: vinyl siding needs 1,200–1,500 PSI, concrete handles 3,000–4,000 PSI, and roofs require soft washing at 500 PSI or less with biodegradable detergent. A single mistake costs $2,000–$5,000 in repairs.
Key Differences: Pressure Washing vs. Soft Washing
Pressure washing uses high-force jets for driveways, patios, and concrete. It's aggressive and removes built-up grime, salt, and rust stains effectively.
Soft washing relies on low pressure (under 500 PSI) plus specialized detergents for delicate surfaces: roofs, siding, stucco, and natural stone. It kills mold, mildew, and algae at the source rather than just blasting them away.
Most reputable companies offer both services because your property needs different approaches. Ask contractors specifically which method they recommend for each surface.
What to Look For in a Pressure Washing Contractor
Insurance and licensing Verify general liability and workers' compensation insurance. A $2 million general liability policy is standard. Request certificates of insurance before work begins. Check your state's contractor licensing board—requirements vary, but most states require at least a business license and proof of liability coverage.
Equipment and approach Ask about their equipment brand and maintenance schedule. Professional-grade units from companies like PowerVac, Hot Shot, or Cat cost $15,000–$35,000 and receive regular service. Avoid contractors who show up with a consumer-grade machine from a big-box store.
References and ratings Request at least three recent references for similar jobs. Call them—don't just read Google reviews. Ask specifically: "Did they protect your plants and landscaping?" "Did they discuss pressure settings before starting?" "Was cleanup thorough?" Look for contractors with 4.7+ stars and 50+ verified reviews across platforms.
Pre-service inspection Legitimate companies send someone to assess the job. They should note existing damage, discuss pressure settings, cover plants and outdoor electronics, and explain their process. If a quote comes via phone without a site visit, that's a red flag.
Typical Pricing and Timeline
- Driveway/walkway (2,000 sq ft): $250–$450
- House exterior (2-story, 3,000 sq ft): $400–$800
- Roof soft wash: $600–$1,500 depending on pitch and square footage
- Pool deck/patio: $200–$500
- Gutter cleaning (if offered): $150–$300
Most residential jobs finish in 2–4 hours. Larger properties or heavily soiled areas may take a full day. Reputable contractors provide written estimates with start dates and weather contingencies.
Red Flags to Avoid
- No proof of insurance or licensing
- Pressure estimates that seem too low (often means inexperience or corners cut)
- Refusing to discuss pressure settings or surface types
- No references available
- Demand for full payment upfront (standard is 50% deposit, 50% on completion)
- Pressure washing roofs with high PSI instead of soft washing
Making Your Final Choice
Compare 3–4 quotes from contractors in your area. Use platforms like Mercoly to see verified providers, their insurance status, customer reviews, and past work photos side by side—it cuts comparison time significantly.
Before hiring, confirm: which surfaces they'll treat, exact pressure settings or soft-wash method per surface, timeline, cleanup responsibility, and warranty against damage. Get everything in writing.
Ask about seasonal discounts. Spring and fall are peak seasons; winter jobs sometimes earn 10–20% discounts.
Frequently Asked Questions
Q: Can pressure washing damage my roof, and why do some companies refuse the job? Yes—high-pressure jets can strip granules from shingles or cause leaks. Reputable companies soft wash roofs instead (500 PSI max with detergent), which kills algae and mold without damage. Many refuse high-pressure roof cleaning specifically to protect your warranty.
Q: What should I do to prepare before the contractor arrives? Move cars and outdoor items like grills or planters, water any delicate plants heavily the morning-of (saturation protects them), and ensure someone's home to discuss specifics. Turn off exterior electronics like smart speakers.
Q: How long does the cleaned surface stay clean? Driveways and decks typically stay clean 1–2 years depending on weather, shade, and debris. Roofs may stay algae-free for 3–5 years if soft washed properly. Annual maintenance washing costs less than deep cleans.
Start comparing verified pressure and soft washing providers in your area today.