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TSP Roofing and Solar vs Diablo Solar Services
Contra Costa Electrical Contractors Comparison · Updated March 2026
TSP Roofing and Solar brings combined roofing and solar expertise with 3 years licensed, while Diablo Solar Services offers 42 years of specialized solar experience including pool systems.
| TSP Roofing and Solar | Diablo Solar Services | |
|---|---|---|
| Rating | ★ 5.0 | ★ 4.2 |
| Years Licensed | 3 years | 42 years |
| License # | 1096233 | 454228 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Hercules, CA | Martinez, CA |
| Website | www.tsproofingandsolar.com | diablosolar.com |
Key Differences
What Customers Say
TSP Roofing and Solar
Customers consistently praise TSP for responsive communication with regular progress updates, fast scheduling, and efficient project completion including one-day installations.
Diablo Solar Services
Customers highlight Diablo's thorough technical expertise, long-term service relationships spanning decades, and willingness to repair systems rather than recommend costly replacements.
Key Takeaway: TSP receives feedback emphasizing speed and frequent communication during active projects, while Diablo's reviews focus on diagnostic depth and trusted advisor relationships built over many years of service.
Customer Reviews
TSP Roofing and Solar
I can't recommend TSP Roofing & Solar enough. Mario and his team were absolutely incredible. I reached out to over 25 different companies trying to find someone who could handle both roofing and solar...
From beginning to end TSP roofing and solar did a fabulous job. They did a new roof for us along with solar battery bundle. They were efficient and well organized and most importantly they kept in tou...
Mario and crew over-delivered on everything! They recognized we’d need to upgrade our electrical panel and got it approved by PG&E and installed within 30 days, when other installers told us 3—4 m...
Diablo Solar Services
Mike and his team are incredible, and I don't say that lightly. From my own personal experience working with both solar and pool service companies, Diablo Solar is an easy one for me to recommend. The...
Diablo saved me from another solar company that tried to pressure me into a more expensive program for repair of my solar panel. Diablo saved me thousands of dollars with expert advice and a staff tha...
Unlike many of their competitors, Diablo were willing to expand and existing solar system, and were able to maximally exploit existing equipment to cut the total cost. They did not try to oversell, co...
Consider TSP Roofing and Solar if...
- ✓ You need roofing work done simultaneously with solar installation and want a single contractor accountable for both the roof integrity and solar performance
- ✓ Your project timeline is tight and you value quick scheduling with one-day installations for straightforward solar work
- ✓ You prefer high owner involvement with frequent progress updates including photos throughout the project
- ✓ Your solar system is relatively new or standard, not requiring deep troubleshooting of legacy equipment or obscure compatibility issues
Consider Diablo Solar Services if...
- ✓ You have a pool solar heating system or want one installed, as this is specialized work TSP doesn't advertise
- ✓ Your existing solar system is older and experiencing intermittent problems that require diagnostic expertise across decades of equipment generations
- ✓ You value long-term service relationships and want a contractor who can maintain your system for years, potentially decades
- ✓ Your project involves coordination with a separate roofing contractor and you need solar panels temporarily removed and reinstalled during roof replacement
Questions to Ask Before Hiring
- → Ask TSP for references from projects at least 2 years old to understand how their installations perform over time and how they handle warranty callbacks
- → Ask Diablo about typical response times during peak season, as reviews note scheduling challenges when demand is high
- → For complex diagnostic work, ask TSP how they handle issues outside their 3 years of direct experience and whether they consult with more experienced technicians
- → If your roof may need work, ask Diablo who they typically coordinate with for roofing repairs discovered during solar projects
The Bottom Line
Choose TSP Roofing and Solar if you need coordinated roofing and solar work, value fast project completion with hands-on communication, and have a relatively standard installation without legacy equipment complications. Their 3 years licensed is adequate for new installations and routine repairs on modern systems. Choose Diablo Solar Services if you have pool solar heating needs, own an older solar system requiring expert diagnostics, or want a contractor with proven longevity for ongoing maintenance relationships. Their 42 years of experience provides unmatched depth for complex troubleshooting and repair-versus-replace decisions that can save significant money. For straightforward photovoltaic installations on homes needing roof work, TSP's integrated approach offers clear advantages despite less experience.
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Frequently Asked Questions
Not necessarily less reliable, but differently experienced. TSP handles standard installations and common repairs competently with modern equipment and techniques. Diablo's four decades matter most when diagnosing obscure problems in older systems, working with discontinued equipment, or providing perspective on long-term system performance. For straightforward new installations or integrated roof-solar projects, TSP's recent training may actually reflect more current best practices.
TSP's documented work focuses on photovoltaic solar and roofing, with no mention of pool solar heating systems in their project types or reviews. Diablo explicitly specializes in pool solar with decades of experience in seasonal maintenance, leak repairs, and system optimization. If you have or want pool solar heating, Diablo is the clear choice based on proven expertise in this niche.
TSP Roofing and Solar is specifically structured for this scenario, with demonstrated success coordinating both scopes under one contract. This eliminates finger-pointing if leaks develop and ensures roof structure is properly assessed for solar load. Diablo would require you to hire and coordinate a separate roofing contractor, though they're experienced at panel removal and reinstallation if your roof project comes first.
Both handle repair calls, but their strengths differ. TSP demonstrates faster scheduling and quick turnarounds, which matters for urgent situations. Diablo's deeper diagnostic experience means they're more likely to correctly identify root causes on the first visit, especially with older or complex systems. Ask each about their typical response time for emergency service calls and whether they stock common replacement parts.
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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 09, 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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