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Dollens Electric vs Backflow Prevention Specialists
Santa Clara General Contractors Comparison · Updated March 2026
These contractors serve completely different needs: Dollens Electric handles general electrical work while Backflow Prevention Specialists only performs backflow testing and compliance.
| Dollens Electric | Backflow Prevention Specialists | |
|---|---|---|
| Rating | ★ 4.9 | ★ 4.5 |
| Years Licensed | 20 years | 43 years |
| License # | 867376 | 427328 |
| Workers' Comp | ✓ Yes | ✓ Yes |
| Bond Amount | $25,000 | $25,000 |
| Location | San Jose, CA | Sunnyvale, CA |
| Website | dollenselectric.com | www.backflow-prevention.com |
Key Differences
What Customers Say
Dollens Electric
Dollens Electric customers consistently emphasize quick response times, detailed technical explanations, and repeat business over multiple years across diverse electrical projects.
Backflow Prevention Specialists
Backflow Prevention Specialists customers highlight responsive scheduling and parts availability, but some note significant pricing differences compared to other backflow contractors.
Key Takeaway: Dollens Electric feedback focuses on technical communication and project complexity handling, while Backflow Prevention Specialists reviews emphasize the importance of price comparison for specialized backflow compliance work.
Customer Reviews
Dollens Electric
Great Company, very happy every time they do work for us.
I needed to upgrade my electrical panel. Dollens Electric did a load calculation and recommended a new panel that would accommodate the electrification of my furnace and water heater down the road. Th...
Fixed my problem and replaced my electronic door lock promptly.
Backflow Prevention Specialists
The Best place to go for all your backflow needs.
They always have the backflow repair parts I need in stock! Also if I have any questions, they are very knowledgeable and helpful.
Best of the best. Other companies are horrible at scheduling/ communication/ and price. BPS are very honest, scheduling is simple, communication is top notch. New backflow on the side of HWY 17, no ne...
Consider Dollens Electric if...
- ✓ You need any standard electrical work including panel upgrades, circuit installation, lighting, generator installation, EV charging stations, or electrical troubleshooting
- ✓ You're looking for a general electrical contractor who can diagnose and solve varied electrical problems in residential or commercial settings
- ✓ You value detailed technical explanations and want a contractor with strong communication throughout the project
- ✓ You need emergency electrical service or planned installation work handled by experienced technicians with two decades in the trade
Consider Backflow Prevention Specialists if...
- ✓ You specifically need backflow prevention device testing, certification, repair, or replacement to meet regulatory water safety compliance requirements
- ✓ You're looking for specialized expertise in backflow assemblies rather than general plumbing services
- ✓ You need access to backflow parts inventory or technical guidance on backflow prevention equipment
- ✓ You want a contractor with over four decades of focused experience in this specific compliance area, though you should obtain multiple quotes given feedback about pricing variability
Questions to Ask Before Hiring
- → Confirm with each contractor whether your specific project falls within their service scope, as these companies serve entirely different trades
- → If considering Backflow Prevention Specialists, ask for detailed pricing breakdown and obtain at least two additional quotes from backflow specialists for comparison
- → Ask Dollens Electric for references from projects similar to yours in complexity, particularly if your electrical work involves code compliance or system upgrades
- → Verify timeline expectations and whether either contractor anticipates permitting requirements for your specific project type
The Bottom Line
This comparison only makes sense if you're uncertain about your project type. For any electrical work whatsoever, Dollens Electric is your contractor with 20 years of broad electrical experience and strong customer feedback on communication and technical knowledge. For backflow prevention device testing, repair, or replacement required for water safety compliance, Backflow Prevention Specialists brings 43 years of focused expertise. You cannot substitute one for the other. Identify your actual need first, then contact the appropriate specialist. If you genuinely need both electrical and backflow work, plan to hire both contractors separately.
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Frequently Asked Questions
If your project involves wiring, circuits, panels, outlets, lighting, generators, or anything powered by electricity, you need an electrical contractor like Dollens Electric. If you've received a notice about backflow testing, need a backflow prevention device installed or repaired for water system compliance, or are dealing with cross-connection control requirements, you need Backflow Prevention Specialists. These are completely separate trades.
Customer feedback indicates Backflow Prevention Specialists' pricing may differ substantially from other backflow contractors for similar work. Since backflow testing and device replacement is often mandated by water districts with specific deadlines, obtaining multiple quotes before committing is recommended. The specialized nature of the work doesn't necessarily mean uniform pricing across providers.
Not for your decision, because they work in different trades entirely. Backflow Prevention Specialists' 43 years versus Dollens Electric's 20 years would only matter if they competed for the same projects, which they don't. Both have veteran-level experience in their respective specialties, which is what matters for the work each performs.
No. Dollens Electric operates under an electrical contractor license and handles electrical projects exclusively. Backflow Prevention Specialists focuses solely on backflow prevention assemblies and compliance work. If you need both electrical work and backflow services, you'll need to hire two separate contractors with the appropriate specialized licenses for each trade.
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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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