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Bay Valley Roofing & Solar vs Star Waterproofing and Roofing
Contra Costa Roofing Contractors Comparison · Updated March 2026
Bay Valley brings 13 years of roofing and solar experience versus Star's 8-year track record focused on waterproofing and leak diagnosis.
| Bay Valley Roofing & Solar | Star Waterproofing and Roofing | |
|---|---|---|
| Rating | ★ 4.8 | ★ 4.3 |
| Years Licensed | 13 years | 8 years |
| License # | 982745 | 1036279 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Walnut Creek, CA |
| Website | bayvalleyroofing.com | www.starwaterproofingco.com |
Key Differences
What Customers Say
Bay Valley Roofing & Solar
Bay Valley customers consistently praise thorough photo-documented inspections, organized communication including remote video coordination, and professional crews who maintain clean worksites throughout projects.
Star Waterproofing and Roofing
Star customers emphasize the company's diagnostic expertise for difficult leaks, detailed waterproofing proposals, and reliability across repeat engagements for multi-unit properties.
Key Takeaway: Bay Valley's strength is process organization and documentation across standard roofing with solar integration, while Star specializes in hands-on leak investigation and waterproofing systems for complex envelope challenges.
Customer Reviews
Bay Valley Roofing & Solar
Putting on a new roof is a daunting project, but Bay Valley made everything a breeze for us! The process started with a thorough inspection, and then a very comprehensive video chat with Nathan, who e...
We're so glad we chose Bay Valley Roofing and Solar company to replace our roof. Working with Ryan was top notch customer service. Something we don't see as much anymore. He's professional, detailed, ...
Bay Valley Roofing did a great job in replacing our roof. Although we were out of the area, they did an outstanding job of documenting their work and communicating with us in planning and executing t...
Star Waterproofing and Roofing
Gilber, Linda and the crew are top notch professionals. They waterproofed an outside deck at our building in San Francisco and did an A+ job. They were on time and very responsive to my needs and the ...
I recently hired Star Waterproofing to waterproof my 3 outdoor decks in S.F., they were leaking everywhere . With the amount of rain we have been receiving these past few years , I needed a specialis...
I recently hired Star to replace the flat commercial roof for an apartment building in Oakland (6,500 sq ft). I had an excellent experience from start to finish, and I'm glad to leave a glowing recomm...
Consider Bay Valley Roofing & Solar if...
- ✓ You have a sloped residential roof that needs replacement or major repairs, especially if you're coordinating with existing or planned solar panels
- ✓ Your project requires detailed documentation and remote communication, such as video calls and photo-based proposals for out-of-area decision-makers
- ✓ You value a longer track record—13 years means Bay Valley has navigated more material transitions, code changes, and uncommon roof complications
- ✓ You need follow-up troubleshooting for water intrusion issues, as reviews mention responsive post-project support for leak concerns
Consider Star Waterproofing and Roofing if...
- ✓ You're dealing with a persistent leak that previous contractors haven't successfully diagnosed or resolved
- ✓ Your project involves deck waterproofing, balcony waterproofing, or flat/low-slope roofing systems that require specialized membrane knowledge
- ✓ You manage a multi-unit property or have multiple buildings requiring coordinated exterior envelope work including weatherproofing
- ✓ You prefer working with a specialist who focuses on waterproofing challenges rather than a generalist roofing approach
Questions to Ask Before Hiring
- → Ask Bay Valley how they coordinate between roofing and solar work, and whether solar servicing is handled in-house or subcontracted
- → Ask Star about their follow-up protocols, as some reviews mention missed follow-up communication
- → Request references from projects similar to yours—solar-integrated roofs for Bay Valley, or complex leak diagnosis for Star
- → Clarify warranty terms for both the roofing materials and the waterproofing or installation work specific to your project type
The Bottom Line
If you have a sloped residential roof, especially with solar integration needs or plans, Bay Valley's 13 years of roofing experience and documented communication process make them the stronger choice for most homeowners. Their additional years mean more institutional knowledge for handling complications and code requirements. Choose Star Waterproofing if you're specifically dealing with deck or balcony waterproofing, flat roof systems, or a persistent leak that requires diagnostic expertise—their niche focus and hands-on approach to challenging waterproofing scenarios is their clear differentiator. For standard pitched roof replacements without waterproofing complexity, Bay Valley's broader experience and solar capabilities provide more long-term value.
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Frequently Asked Questions
Yes, if you might add solar within the roof's lifespan. Bay Valley's experience with solar shingles and panel coordination means they understand flashing details, structural load considerations, and weatherproofing around penetrations that a roof-only contractor might not prioritize. Even without solar plans, their 13 years provide broader exposure to complex scenarios.
Customer feedback suggests Star has specific depth in flat and low-slope systems like torch-down and tar-and-gravel roofs, particularly for multi-unit buildings. Bay Valley's reviews focus more on sloped residential roofs. If you have a flat roof or complex waterproofing challenge, Star's specialization is directly aligned with that need.
Yes, particularly for diagnosing hidden damage or handling unexpected complications. Thirteen years means Bay Valley has seen more unusual failure patterns, worked through more material generation changes, and navigated more permitting evolutions. For straightforward replacements the gap matters less, but for older roofs or storm damage, experience depth helps.
Star's customer feedback specifically emphasizes leak diagnosis expertise and detective work for difficult-to-find water intrusion, making them well-suited if previous attempts have failed. Bay Valley shows strong follow-through when leaks arise post-project, but Star's core focus on waterproofing gives them an edge for mysterious or persistent leak challenges.
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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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