Martin Herzfeld
Martin Herzfeld is an active, licensed contractor operating in El Sobrante, CA. Operating under a California contractor license established in 2004. They hold 5 license classifications including C-7 Low Voltage Systems Contractor, C-10 Electrical Contractor, and 3 others. They currently maintain an active contractor bond and a workers' compensation exemption. No disciplinary actions have been recorded against this license.
License Information
- License Number
- 833782
- Status
- Active
- Classification(s)
- C-7: Low Voltage Systems Contractor, C-10: Electrical Contractor, C-46: Solar Contractor, D31: Pole Installation and Maintenance, D56: Trenching Only
- Tenure
- Licensed since 2004 (22 years)
- Issue Date
- March 11, 2004
- Expiration Date
- March 31, 2028
- Disciplinary Record
- No Disciplinary Actions
Bond & Insurance
- Contractor Bond
- Bonded ($25000) – AMERICAN CONTRACTORS INDEMNITY COMPANY
- Workers’ Compensation
- Exempt
A contractor’s bond protects consumers up to the bond amount if the contractor fails to fulfill contractual obligations or violates CSLB regulations.
Workers’ compensation insurance protects homeowners from liability if a contractor’s employee is injured on the job site.
Location
- Address
- 6131 HILLSIDE DR
- City
- El Sobrante, CA
- ZIP Code
- 94803
- Phone
- (510) 243-0190
Need Coverage?
Quote and purchase a California contractor license bond online. Create a free account to compare rates and print your bond certificate instantly.
Get Started at Colonial Surety →
Free account required for rate quotes.
Get workers’ comp, general liability, or a bundled policy quoted online in minutes.
Get a Contractor Insurance Quote →
Via Ergo Next Insurance. No obligation.
About These License Types
C-7: Low Voltage Systems Contractor
Installs, services, and maintains communication and low voltage systems not exceeding 91 volts, including telephone, sound, cable television, closed-circuit video, satellite dish antennas, instrumentation, temperature controls, and low voltage landscape lighting.
Not authorized: Does not include low voltage fire alarm systems or systems exceeding 91 volts (see C-10).
C-10: Electrical Contractor
Places, installs, erects, or connects electrical wires, fixtures, appliances, apparatus, raceways, conduits, solar photovoltaic cells, or any part thereof which generate, transmit, transform, or utilize electrical energy.
Not authorized: Electricians working under a C-10 must be certified per CA Labor Code.
C-46: Solar Contractor
Installs, modifies, maintains, and repairs thermal and photovoltaic solar energy systems.
Not authorized: Shall not undertake building or construction trades except when required to install a solar energy system.
D31: Pole Installation and Maintenance
Installs and maintains utility and other poles.
D56: Trenching Only
Performs trenching operations only.
Licensing Resources
What does a workers' comp exemption mean?
Deposit and payment rules for California contracts
Home improvement contract requirements
Need a Contractor for Your Project?
Get free quotes from licensed, pre-screened contractors in your area. Compare ratings, reviews, and pricing before you hire.
Starting a Contracting Business in California?
Most California contractors operate as an LLC or sole proprietorship with a DBA. Forming your business entity is a separate step from obtaining your CSLB license.
Verify on Official CSLB Website
License data sourced from the California Contractors State License Board. Last data update: April 05, 2026.