Sierra Roofing and Solar vs Thor Contracting Corporation
East Bay Roofing Comparison · Updated January 2026
| Sierra Roofing and Solar | Thor Contracting Corporation | |
|---|---|---|
| Rating | ★ 4.8 | ★ 4.9 |
| Years Licensed | 22 years | 4 years |
| License # | 835854 | 1093228 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Dublin, CA | El Sobrante, CA |
| Website | www.sierraroofing.com | thorcontractingcorporation.com |
Our Analysis
Thor Contracting Corporation operates from El Sobrante in Contra Costa County. Customer feedback focuses primarily on roofing projects, emphasizing timely arrivals, clear communication about scope and pricing, and an organized process from planning through completion. Several accounts mention efficient scheduling and fast turnaround times, as well as jobsite organization and coordination around inspections and permits. Budget considerations are also referenced, with some customers noting competitive bids and efforts to work within a budget. Both companies report active licensing, workers’ compensation coverage, and the same bond amount, while differing in years licensed and the breadth of services mentioned.
Why choose Sierra Roofing and Solar?
- ✓ You want a contractor described as covering roofing plus gutters and solar-related work, which may simplify coordinating multiple exterior projects.
- ✓ You value detailed on-site evaluations, written estimates, and explanations of findings before deciding on repairs or replacement.
- ✓ You may need help diagnosing leaks, including situations described as time-sensitive during heavy rain.
- ✓ You can plan ahead for scheduling if availability is a concern based on customer comments.
Why choose Thor Contracting Corporation?
- ✓ You want a roofing-focused experience described as organized, with clear communication on scope and pricing from planning through completion.
- ✓ You prioritize efficient scheduling and fast turnaround times, as referenced by customers.
- ✓ You expect coordination around inspections and permits as part of the process.
- ✓ You are comparing bids and want a contractor described as mindful of budget considerations and competitive pricing.
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Frequently Asked Questions
Yes. Both Sierra Roofing and Solar and Thor Contracting Corporation list an active license status and workers’ compensation coverage.
Sierra Roofing and Solar is described as handling solar-related work in addition to roofing and gutters.
Sierra Roofing and Solar is based in Dublin, Alameda County, California. Thor Contracting Corporation is based in El Sobrante, Contra Costa County, California.
Both companies list a $25,000 bond.
Other East Bay Roofing Comparisons
Data Sources: License information from California CSLB. Ratings and reviews from Google. Last verified January 13, 2026.
This comparison is based on publicly available information. We recommend getting multiple quotes and verifying all credentials directly before hiring.