Compare Local Pros
Thor Contracting Corporation vs West Coast Solar
Contra Costa Roofing Contractors Comparison · Updated March 2026
These companies serve different needs: Thor is a dedicated roofing contractor with 4 years of experience, while West Coast Solar is an 18-year veteran solar installer that also does tile roofing.
| Thor Contracting Corporation | West Coast Solar | |
|---|---|---|
| Rating | ★ 4.9 | ★ 4.3 |
| Years Licensed | 4 years | 18 years |
| License # | 1093228 | 908549 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | El Sobrante, CA | Concord, CA |
| Website | thorcontractingcorporation.com | www.westcoastsolar.com |
Key Differences
What Customers Say
Thor Contracting Corporation
Thor customers consistently emphasize fast project completion, on-time performance, and budget-conscious pricing with multiple options to control costs.
West Coast Solar
West Coast Solar customers appreciate no-pressure sales consultations and single-day installations, though some note post-installation service response delays for equipment issues.
Key Takeaway: Thor's feedback centers on speed and efficiency in dedicated roofing work, while West Coast Solar's reviews focus on managing complex solar permitting processes with roofing mentioned as protective work during installations rather than the primary service.
Customer Reviews
Thor Contracting Corporation
Alex arrived right on time within 10 minutes. He was able to give me a price as we went over the details. He knew the inspector that came to do the inspection from prior roof. All the workers were pol...
This company is highly responsive very professional and worked with my budget and even saved me a Little money. To the high work quality I received and the time frame it all got done in was all to the...
Alex has been a great resource. My clients that I've sent to him have all enjoyed his professionalism, patience and honesty with his work.
West Coast Solar
Craig and the customer service staff were awesome! They listened to my concerns and were open to my service options. Craig was very nice and explained everything for me to understand.
Communication was great from the start, to the time they left. Great job WCS!!
On time and did a great job
Consider Thor Contracting Corporation if...
- ✓ You need dedicated roofing work without solar installation, including repairs, re-roofing, or ongoing maintenance as the primary project scope
- ✓ Fast turnaround matters and you want a crew focused solely on completing your roof quickly, with multiple reviews citing completion within tight timeframes
- ✓ Budget flexibility is important and you want competitive pricing with options to work within spending constraints
- ✓ You prefer a contractor whose entire operation and crew training centers on residential roofing rather than solar installation
Consider West Coast Solar if...
- ✓ You're installing solar panels and need roofing work done as part of that project, particularly if you have a tile roof requiring careful handling during mounting
- ✓ You value the deep permitting and inspection navigation experience that comes with 18 years of managing complex solar projects through city approvals
- ✓ Your project involves battery storage like Powerwall units and you want a single contractor handling both the electrical system and roof penetrations
- ✓ You're looking at a solar-plus-roofing package where the roofing component supports the solar installation rather than standalone roof work
Questions to Ask Before Hiring
- → Ask Thor Contracting for references from projects similar in scope and material to your roof, and confirm their typical completion timeline for your specific project type
- → Ask West Coast Solar whether they take on standalone roofing contracts or if roofing services are primarily offered alongside solar installations, and how their crew structure differs between solar and roofing-only projects
- → If choosing West Coast Solar for roofing only, ask about their service response timeline for roof warranty issues separate from solar equipment, given feedback about post-installation service delays
The Bottom Line
If you need roofing work without solar installation, Thor Contracting is the straightforward choice. They're a dedicated roofing contractor with consistent feedback about fast completion, budget flexibility, and clean work practices. Their 4 years of focused roofing experience directly addresses residential roof projects. West Coast Solar's 18 years of experience is impressive but centers on solar installations where roofing is a supporting component. Choose them if you're installing solar panels and need tile roof work integrated into that project, or if you're specifically looking for a solar-plus-roofing package. For standalone roof repairs, replacements, or maintenance, Thor's specialization and speed make them the better fit for most homeowners.
Get Up to 3 Free Quotes
Compare prices from licensed, verified contractors
Frequently Asked Questions
West Coast Solar's description and review patterns suggest their roofing work is primarily tied to solar installations, particularly tile roof expertise for panel mounting. While they're licensed and experienced, their operational focus is solar energy systems. Ask them directly whether they regularly take standalone roofing contracts and how their pricing and timeline compare to their solar-integrated roofing work.
Four years represents a growing contractor rather than a newcomer, and reviews don't flag missed issues or callbacks. However, an 18-year veteran has seen more roof configurations, hidden damage scenarios, and complication patterns. For straightforward re-roofing or repairs on standard residential structures, Thor's focused roofing experience matters more than raw years. For complex or older roofs with potential underlying issues, ask Thor specifically about their diagnostic process and how they handle unexpected discoveries.
The service delay feedback relates to post-installation solar equipment repairs like inverter or optimizer issues, not roofing work. This suggests their service department prioritizes solar system troubleshooting over roofing callbacks. If you're considering them for roofing work, clarify whether roof warranty service runs through the same department and what their typical response timeline is for roof-specific issues versus solar equipment problems.
West Coast Solar has specific tile roof expertise developed through years of mounting solar panels without damaging tiles, and reviews highlight their protective approach. Thor's reviews don't specifically reference tile work, though they handle various roofing projects. If your tile roof replacement is standalone work, ask Thor about their tile experience and typical tile project timeline. If it's part of a solar installation, West Coast Solar's integrated approach makes more sense.
Looking for the Best?
See our ranked list of top roofing contractors in Contra Costa.
Other Contra Costa Roofing Contractors Comparisons
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.
Get in Touch
Have questions or feedback? We'd love to hear from you.