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Maz Plumbing Under Ground And Sewer Services vs Rosenberg Plumbing
San Mateo Plumbing Contractors Comparison · Updated March 2026
Rosenberg Plumbing's 31 years of licensing and workers comp coverage provide significantly more protection than Maz's 2-year license without workers comp.
| Maz Plumbing Under Ground And Sewer Services | Rosenberg Plumbing | |
|---|---|---|
| Rating | ★ 5.0 | ★ 4.6 |
| Years Licensed | 2 years | 31 years |
| License # | 1111601 | 700149 |
| Workers' Comp | — | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | San Mateo, CA | Pacifica, CA |
| Website | mazplumbing.com | www.rosenbergplumbing.net |
Key Differences
What Customers Say
Maz Plumbing Under Ground And Sewer Services
Customers emphasize Maz's exceptional responsiveness with same-day and emergency availability, transparent upfront pricing, and the owner's direct hands-on involvement and technical problem-solving.
Rosenberg Plumbing
Customers highlight Rosenberg's honest diagnostic assessments, willingness to recommend simpler solutions over costly replacements, and long-term repeat relationships built over many years.
Key Takeaway: Both receive similar praise for owner involvement and fair pricing, but Maz stands out for rapid emergency response while Rosenberg is noted more for diagnostic honesty and suggesting cost-saving alternatives.
Customer Reviews
Maz Plumbing Under Ground And Sewer Services
Fantastic experience with Al - quality work and great service! Al did an excellent job installing my new bathtub, shower kit, valves, and bath spout. His workmanship is top-notch, everything looks and...
Maz plumbing is SUPERB. Family owned (the actual owner, Al, comes in to do the work with his helper), he has been in business for almost 30 years. Top quality, speed, clear communication, honest, tid...
Al is the only plumber you need to know around this area. I have hired many plumbing companies before I got to know Al and hated all of them so much. Especially big plumbing companies that send out am...
Rosenberg Plumbing
Rosenberg Plumbing was a second opinion when my last plumber quoted $2000+ to replace a leaking faucet. Mike came, explained the cause of the issue, corrected the issue with a wrench, and advised me h...
This company is terrific. We had a hot water issue and Mike took care of it immediately for us. It didn't just need a quick fix, it entailed installing a brand new heater - which he had done the next ...
Rosenberg Plumbing came in a very timely manner and quickly solved my water heater problem. They are courteous and professional.
Consider Maz Plumbing Under Ground And Sewer Services if...
- ✓ You need same-day or emergency service and Maz has current availability, and you're willing to verify your homeowner's insurance covers contractor injuries
- ✓ Your project is straightforward (fixture replacement, simple water heater swap) where the workers comp risk is minimal because the owner works alone
- ✓ You've confirmed the owner will personally perform all work without assistants, eliminating the injury liability concern
- ✓ You're getting competitive quotes and Maz's transparent pricing approach comes in significantly lower for identical scope
Consider Rosenberg Plumbing if...
- ✓ You want full workers compensation coverage protecting you from liability if anyone is injured during the project
- ✓ Your project involves complex diagnostics on an older home where 31 years of verifiable experience matters for identifying hidden issues
- ✓ You prefer working with an established business with three decades of documented operation and customer relationships
- ✓ You need a crew for larger projects and want assurance they're properly insured
Questions to Ask Before Hiring
- → For Maz Plumbing: Will you be working alone or bringing assistants? If assistants are involved, ask for proof of your homeowner's policy covering contractor injuries since they lack workers comp.
- → For both: Can you provide references from projects completed in the past year that match my specific scope and complexity?
- → For Maz Plumbing: How do you verify the nearly 30 years of experience claimed beyond the 2-year license on record?
The Bottom Line
For most homeowners, Rosenberg Plumbing is the safer choice with 31 years of verifiable licensing, full workers comp coverage, and no liability gaps to navigate. The workers comp issue alone creates real financial risk with Maz unless you verify coverage through your homeowner's policy and confirm the owner works alone. If Maz offers significantly better availability or pricing for a simple project and you've addressed the insurance concern directly, their owner's technical skills may suffice. But for complex work, crew-involved projects, or risk-averse homeowners, Rosenberg's established track record and complete coverage make the decision straightforward.
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Frequently Asked Questions
Yes, because Rosenberg's 31 years of continuous licensing is verifiable through state records, while Maz's claimed 30 years of personal experience predates their 2-year contractor license. Established licensing history demonstrates sustained business operations, complaint resolution, and regulatory compliance over decades, not just technical skills.
If the owner works entirely alone, risk is minimal. If assistants or crew members are involved and someone gets injured on your property, your homeowner's insurance may need to cover medical costs and lost wages, potentially leading to claims against your policy. Before hiring Maz, contact your insurance agent to confirm coverage and any premium implications.
Customer feedback suggests both deliver quality work with transparent, fair pricing and similar project capabilities. The practical difference isn't likely in routine installations but in complex diagnostics and handling unexpected complications where Rosenberg's three decades of documented problem-solving provides more verified depth.
Only if you've confirmed your homeowner's insurance covers contractor injuries and verified who will actually be performing the work. A few hundred dollars saved isn't worth potential liability exposure if multiple workers are involved and someone gets hurt on your property.
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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 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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