Compare Local Pros
Bay Valley Roofing & Solar vs Northstar Solar
Contra Costa General Contractors Comparison · Updated March 2026
Bay Valley brings 13 years of roofing expertise with solar capabilities, while Northstar is a dedicated solar specialist with 10 years focused exclusively on photovoltaic systems.
| Bay Valley Roofing & Solar | Northstar Solar | |
|---|---|---|
| Rating | ★ 4.8 | ★ 4.7 |
| Years Licensed | 13 years | 10 years |
| License # | 982745 | 1006316 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | Concord, CA | Danville, CA |
| Website | bayvalleyroofing.com | www.gonorthstarsolar.com |
Key Differences
What Customers Say
Bay Valley Roofing & Solar
Customers emphasize Bay Valley's detailed roof inspections with photo documentation, responsiveness throughout projects, and ability to troubleshoot complex issues like leak diagnosis and storm damage assessment.
Northstar Solar
Customers highlight Northstar's thorough energy usage consultations, transparent system design explanations with multiple equipment options, and efficient handling of solar-specific permitting and utility coordination.
Key Takeaway: Bay Valley's reviews focus on roofing diagnostics and worksite management, while Northstar's feedback centers on solar system optimization and project timeline efficiency, reflecting their different core specializations.
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...
Northstar Solar
I never write reviews, but NorthStar Solar truly earned it. After soliciting multiple bids, Patrick stood out right away - he took the time to do a Zoom call to understand my property and my goals ins...
I had a great experience with my solar and battery installation. The team was very knowledgeable and responsive. The whole installation was very fast from start to finish.
I had a solar system installed by Northstar Solar this past winter, and I am thoroughly impressed with their service. I obtained several bids from different companies, Northstar Solar's bid stood out ...
Consider Bay Valley Roofing & Solar if...
- ✓ Your roof is more than 15 years old or has visible wear, making it critical to assess structural integrity before adding solar panel weight
- ✓ You're dealing with existing leak issues, inadequate ventilation, or storm damage that needs expert roofing diagnosis alongside solar planning
- ✓ You want a single contractor accountable for both roof warranties and solar installation rather than coordinating between separate companies
- ✓ Your project involves solar shingles or integrated roofing products where roof and solar installation are inseparable
Consider Northstar Solar if...
- ✓ Your roof is in solid condition and confirmed by inspection to have 15+ years of remaining life
- ✓ You're focused on maximizing solar system performance, comparing battery storage options, or planning a ground-mounted array where roofing expertise isn't relevant
- ✓ You want deep expertise in utility interconnection, net metering optimization, and navigating solar-specific permitting
- ✓ You're comparing multiple panel brands, inverter types, or battery systems and need a specialist who works across equipment manufacturers daily
Questions to Ask Before Hiring
- → Ask Bay Valley: Who handles ongoing solar system monitoring and repairs if panels underperform, and what is your warranty coverage for solar-specific components versus roofing elements?
- → Ask Northstar: If your roof inspection reveals damage or wear during site assessment, what is your process for coordinating roof repairs, and who do you partner with for roofing work?
- → Ask both: What happens if a roof leak occurs within five years—who diagnoses whether it's a roofing or solar installation issue, and who is responsible for the repair?
- → Ask both: Can you provide references from projects where both roof replacement and solar installation were completed, and how was that coordination managed?
The Bottom Line
Choose Bay Valley Roofing & Solar if your roof's condition is uncertain, you're dealing with leaks or storm damage, or you want one contractor accountable for both roof integrity and solar installation. Their 13 years of roofing expertise means they'll catch structural issues that could compromise solar warranties down the road. Choose Northstar Solar if your roof is in confirmed good condition with at least 15 years of life remaining and your focus is optimizing solar system performance, battery storage, or equipment selection. Their dedicated solar specialization delivers deeper expertise in system design and utility coordination. For projects requiring significant roof work alongside solar, Bay Valley's integrated approach reduces risk; for straightforward solar installations on sound roofs, Northstar's focused expertise likely delivers better value.
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Frequently Asked Questions
Bay Valley handles both as an integrated project with a roofing contractor's perspective, which simplifies warranty accountability and ensures roof structure drives decisions. Northstar would coordinate with a roofing partner, giving you solar specialists designing your system but requiring you to manage the roofing relationship separately. The integrated approach typically reduces coordination risk but may limit solar equipment options.
It depends on the problem source. Bay Valley's roofing expertise makes them better equipped to diagnose whether water intrusion stems from flashing, underlayment, or solar mounting penetrations. Northstar's solar focus means they'll better troubleshoot inverter failures, panel performance issues, or battery system problems. Ask each company specifically about their process for diagnosing issues that span both disciplines.
Customer reviews mention solar shingles and panel installations, but Bay Valley notes that solar servicing may be limited, suggesting their solar capabilities support roofing projects rather than functioning as a full-service solar division. Northstar offers battery storage, ground mounts, and works with multiple equipment brands, indicating broader solar-specific capabilities. If system complexity or battery integration matters, confirm Bay Valley's current solar service scope directly.
Bay Valley is described as fair but potentially not the lowest bid, likely reflecting their thorough roofing assessments that may uncover additional structural work. Northstar is noted as competitively priced for solar, probably due to volume purchasing and installation efficiency from specialization. If your project requires roof repairs, Bay Valley's pricing includes that expertise; if your roof is sound, Northstar may deliver better solar value.
Looking for the Best?
See our ranked list of top general contractors in Contra Costa.
Other Contra Costa General Contractors Comparisons
Bay Valley Roofing & Solar
★ 4.8
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★ 4.9
Bay Valley Roofing & Solar
★ 4.8
Apollo Roofing Company
★ 5.0
Bay Valley Roofing & Solar
★ 4.8
Got Watts?
★ 4.9
Bay Valley Roofing & Solar
★ 4.8
High Definition Solar
★ 4.1
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.
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