Compare Local Pros
Quattro Solar vs SonoMarin Solar & Electric
Marin Solar Contractors Comparison · Updated March 2026
Quattro Solar brings nearly double the licensing history (15 years vs 8 years), while SonoMarin offers broader service capabilities including battery storage and generators.
| Quattro Solar | SonoMarin Solar & Electric | |
|---|---|---|
| Rating | ★ 4.7 | ★ 4.6 |
| Years Licensed | 15 years | 8 years |
| License # | 954020 | 1035189 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Novato, CA | San Rafael, CA |
| Website | www.quattrosolar.com | sonomarinsolar.com |
Key Differences
What Customers Say
Quattro Solar
Customers consistently emphasize David Quattro's personal integrity and the knowledgeable, friendly approach of staff throughout the solar installation process.
SonoMarin Solar & Electric
Customers highlight SonoMarin's competitive pricing and direct leadership involvement from initial quotes through permitting and installation completion.
Key Takeaway: Quattro earns reputation for relationship integrity and expertise, while SonoMarin gets recognized for value pricing and hands-on project coordination through regulatory processes.
Customer Reviews
Quattro Solar
Absolute quality! Quattro Solar IS a name you can count on! Very friendly and knowledgeable staff. The owner David Quattro is a man of integrity and cares deeply about the work, his clients, and the e...
SonoMarin Solar & Electric
SonoMarin Solar went above and beyond in their installation of solar panels and battery back-up storage. We had gotten royally played by Tesla. When forced to look for alternatives, the two biggest n...
Top shelf from beginning to end. Sonomarin was the lowest price of 4 bids I received. Local shop that seems very efficient and professional. Nick did a great job explaining how to monitor the system a...
Overall very happy with the team at SonoMarin Solar. Nick was both our salesperson and installer (with a team of course) for a roof stop solar installation in the town of Sonoma. We had an issue on ...
Consider Quattro Solar if...
- ✓ Your roof is older, complex, or has unusual angles where veteran experience diagnosing structural concerns and planning optimal panel placement will prevent costly mistakes
- ✓ You're prioritizing pure solar expertise over bundled services, wanting a contractor who has specialized in photovoltaic systems through multiple technology generations
- ✓ Owner integrity and long-term business stability matter significantly to you for a 25-year investment, and you value Quattro's 15-year proven track record in the local market
- ✓ Your project is straightforward solar without battery storage or generator needs, making SonoMarin's broader service menu unnecessary
Consider SonoMarin Solar & Electric if...
- ✓ You're planning battery backup storage or generator installation alongside solar panels, making SonoMarin's integrated electrical capabilities more efficient than coordinating multiple contractors
- ✓ Competitive pricing is a priority and you're obtaining multiple bids, as customer feedback specifically mentions SonoMarin delivering the lowest quotes
- ✓ You need significant permitting assistance and appreciate contractors who actively coordinate with local agencies, an area where SonoMarin receives specific customer recognition
- ✓ Your project involves complex electrical work beyond basic solar installation, where their dual solar-electrical licensing provides broader problem-solving capabilities
Questions to Ask Before Hiring
- → Ask Quattro Solar about their experience with your specific roof type and age, requesting references from similar installations to leverage their veteran expertise
- → Ask SonoMarin whether their pricing includes battery storage consultation and whether bundling services provides cost advantages over separate contractors
- → Ask both companies how many solar installations they've completed in the past 12 months to understand current crew experience and workload capacity
- → Request detailed warranty information for both equipment and installation labor, asking who handles service calls if issues arise years from now
The Bottom Line
For straightforward solar installations, especially on older or complex roofs, Quattro Solar's 15-year veteran expertise and reputation for integrity make them the safer choice for a 25-year investment. Their specialized solar focus means deeper pattern recognition when complications arise. Choose SonoMarin if you're bundling battery storage or generators with your solar project, where their integrated electrical capabilities and competitive pricing deliver better value than coordinating multiple contractors. If you're purely comparing solar-only installations, Quattro's nearly doubled licensing history provides meaningful additional protection against installation problems. Get quotes from both, but weight Quattro's veteran experience heavily unless SonoMarin's expanded services specifically match your needs.
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Frequently Asked Questions
The additional seven years means Quattro has handled more equipment generations, roof complications, and permitting changes—valuable when installers encounter surprises like outdated electrical panels or unusual roof structures. SonoMarin's 8 years still represents solid experience through significant industry maturation. The gap matters most for complex or older homes where veteran pattern recognition prevents problems.
Only if you're seriously considering battery backup or generators within your decision timeline. Having one contractor handle integrated systems simplifies warranties and service calls later. However, if you're purely focused on solar panels now, Quattro's specialized 15-year solar focus may deliver better value. You can always add batteries later through a separate contractor if needed.
Not necessarily. Customer feedback highlights SonoMarin's competitive bids, but pricing depends on your specific project scope, equipment choices, and current workload. Quattro's veteran status might command premium pricing, or their established supplier relationships might offset costs. Get detailed quotes from both, ensuring you're comparing equivalent equipment and warranties before deciding on price alone.
Quattro customers specifically praise David Quattro's integrity and personal care about work quality and relationships. SonoMarin customers note leadership involvement from sales through installation and permitting. Both suggest you'll get personal attention rather than being handed off to subcontractors. The difference appears more in emphasis—relationship integrity versus hands-on project coordination—than in actual access to ownership.
Looking for the Best?
See our ranked list of top solar contractors in Marin.
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How We Compare Contractors
License Verification
All license data is sourced from official California CSLB records and verified regularly.
Review Analysis
Customer reviews are aggregated from Google and analyzed to identify patterns in service quality.
Detailed Comparison
We analyze credentials, insurance, experience, and feedback to highlight meaningful differences.
Not all licensed contractors are created equal. While a valid license is the baseline requirement in California, contractors can vary significantly in experience, insurance coverage, and customer satisfaction.
- Experience matters: A contractor with 15+ years of experience has likely encountered and solved problems that newer contractors haven't faced yet.
- Workers' compensation protects you: If a contractor without workers' comp insurance has an employee injured on your property, you could be held liable.
- Reviews reveal patterns: Individual reviews can be misleading, but patterns across many reviews often reveal a contractor's true strengths and weaknesses.
- Bond amounts vary: A contractor's bond provides financial protection if they fail to complete work as agreed. Higher bonds offer more protection.
Taking time to compare contractors on these factors can save you from costly mistakes and help ensure your project is completed by a qualified professional.
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified March 12, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.
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