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Thor Contracting Corporation vs High Definition Solar
Contra Costa Roofing Contractors Comparison · Updated March 2026
You're comparing a roofing specialist with 4 years experience to a 16-year solar veteran that also does roofing work.
| Thor Contracting Corporation | High Definition Solar | |
|---|---|---|
| Rating | ★ 4.9 | ★ 4.1 |
| Years Licensed | 4 years | 16 years |
| License # | 1093228 | 949189 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | El Sobrante, CA | Concord, CA |
| Website | thorcontractingcorporation.com | highdefinitionsolar.com |
Key Differences
What Customers Say
Thor Contracting Corporation
Customers consistently praise Thor Contracting for fast project completion, on-time performance, competitive pricing, and maintaining clean worksites throughout roofing projects.
High Definition Solar
High Definition Solar receives praise for professional installation crews, thorough explanations without sales pressure, and long-term service relationships spanning years after initial solar installation.
Key Takeaway: Thor's reviews focus exclusively on roofing execution speed and value, while High Definition Solar's feedback centers on solar system performance and ongoing technical support, with roofing mentioned as secondary work.
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.
High Definition Solar
Super effort to install my job on the scheduled day. The crew arrived at exactly 8:oo AM as promised and were completely finished at 2:00 pm. Everything worked! The crew was very professional. I aam ...
Quick response, took time to explain the process and were able to process everything on time. It went smoothly. Jairo was super helpful and patient!
We had HD Solar do a big install for us in Richmond California. They did a great job, very professional, and we love saving huge amounts of money of electricity now! Plus, no more power outages due to...
Consider Thor Contracting Corporation if...
- ✓ You need a straightforward roof repair, replacement, or maintenance project without solar considerations, and want a contractor whose entire business revolves around roofing execution
- ✓ Timeline is a priority and you value the fast completion windows repeatedly mentioned in Thor's reviews, including crews finishing projects in tight timeframes
- ✓ Budget is a significant concern and you want competitive bids from a company that customers say helped them save money while meeting expectations
- ✓ You prefer working with a specialized roofing contractor who maintains focus on jobsite cleanliness and organized scheduling throughout the permit and construction process
Consider High Definition Solar if...
- ✓ You're planning a solar installation now or in the near future and need roof work done first, making High Definition Solar's ability to coordinate both projects under one contract valuable
- ✓ You value the depth of experience that comes with 16 years in business, particularly for diagnosing structural issues or handling permit complexities across multiple counties
- ✓ You want a contractor with a documented track record of long-term service relationships, as reviews mention ongoing support for systems installed over a decade ago
- ✓ Your roof work involves preparing for solar panel installation and you want the roofing contractor to understand mounting requirements, load considerations, and waterproofing specific to solar arrays
Questions to Ask Before Hiring
- → If choosing High Definition Solar for roofing only, ask what percentage of their roof projects are standalone versus solar-related, and request references specifically from non-solar roofing customers
- → If choosing Thor Contracting, ask for references from projects with similar scope and complexity to yours, particularly if your roof is older or may have hidden structural issues
- → Ask both companies about their warranty coverage for roofing work specifically, including what's covered and for how long
- → Confirm crew availability and projected timeline, as Thor emphasizes speed while High Definition Solar may prioritize solar scheduling
The Bottom Line
If you need roofing work without solar involvement, Thor Contracting is the more straightforward choice—they specialize in roofing, consistently deliver fast timelines, and show a pattern of competitive pricing and budget flexibility. Their 4 years of experience is sufficient for standard residential roofing projects, and their reviews demonstrate reliable execution. Choose High Definition Solar if you're planning solar installation and want to coordinate roof work simultaneously, or if you specifically value their 16 years of veteran experience for a complex project. For a standalone roof repair or replacement this week, Thor's focused expertise and rapid turnaround track record makes them the better fit for most homeowners.
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Frequently Asked Questions
Yes, but the significance depends on your project. For straightforward roof replacements or repairs on standard homes, Thor's 4 years provides adequate experience, and their reviews show consistent execution. For complex projects involving structural concerns, unusual roof configurations, or coordination with solar installations, High Definition Solar's 16 years offers deeper problem-solving experience and a longer track record of handling permit processes across multiple jurisdictions.
High Definition Solar does perform standalone roofing work, as evidenced by leak repairs and roof replacements mentioned in reviews. However, their primary business is solar installation, so roofing appears to be a complementary service. Ask them directly about their workload balance and request references from recent customers who hired them for roofing only, to ensure you're not competing with solar projects for scheduling priority.
Thor Contracting has a clear pattern in reviews of fast completion timelines, with multiple customers mentioning jobs finished within short windows. High Definition Solar's reviews focus more on solar installation speed than roofing-specific turnaround times. If you need quick execution on a roofing project, Thor's track record makes them the stronger choice for timeline-sensitive work.
Thor's reviews repeatedly mention budget-conscious options, competitive bids, and helping customers save money, suggesting flexibility and value positioning. High Definition Solar's feedback focuses on transparent pricing explanations and avoiding overselling on solar systems, but doesn't emphasize competitive pricing on roofing specifically. For cost-sensitive roofing projects, Thor appears more likely to work within tighter budgets based on customer feedback patterns.
Looking for the Best?
See our ranked list of top roofing contractors in Contra Costa.
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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 13, 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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