Ralph Holden & Co
Ralph Holden & Co is an active, licensed contractor operating in Healdsburg, CA. Operating under a California contractor license established in 1975. They hold 6 license classifications including A General Engineering Contractor, B General Building Contractor, and 4 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
- 307640
- Status
- Active
- Classification(s)
- A: General Engineering Contractor, B: General Building Contractor, C-10: Electrical Contractor, C-16: Fire Protection Contractor, C-36: Plumbing Contractor, C-57: Well Drilling Contractor
- Tenure
- Licensed since 1975 (50 years)
- Issue Date
- July 01, 1975
- Expiration Date
- August 31, 2026
- Disciplinary Record
- No Disciplinary Actions
Bond & Insurance
- Contractor Bond
- Bonded ($25000) – HUDSON INSURANCE 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
- 6055 W DRY CREEK ROAD
- City
- Healdsburg, CA
- ZIP Code
- 95448
- Phone
- (707) 484-2558
About These License Types
A: General Engineering Contractor
Authorizes construction of fixed works requiring specialized engineering knowledge and skill, including irrigation, drainage, water power, water supply, flood control, inland waterways, harbors, docks, shipyards, dams, hydroelectric projects, levees, railroads, highways, tunnels, airports, sewers, bridges, pipelines, parks, refineries, and power plants.
Not authorized: Does not authorize work under a Class B General Building Contractor license or any specialty (C) classification unless incidental to the engineering project.
B: General Building Contractor
Authorizes construction of structures including residential, commercial, and industrial buildings requiring at least two unrelated building trades or crafts. May take prime contracts or subcontracts for framing or carpentry. May subcontract all specialty work but must hold the appropriate C license to self-perform specialty trade work.
Not authorized: Cannot self-perform specialty trade work (electrical, plumbing, HVAC, etc.) without holding the corresponding C license. Cannot contract for C-16 Fire Protection or C-57 Well Drilling without the appropriate license or subcontractor.
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-16: Fire Protection Contractor
Lays out, fabricates, and installs all types of fire protection systems including all associated equipment.
Not authorized: Does not include electrical alarm systems.
C-36: Plumbing Contractor
Provides means for a supply of safe water and proper disposal of fluid waste, including piping, storage tanks, venting, gas appliances and connections, water and gas piping, water heating equipment including solar, and health and safety devices such as backflow preventers and gas earthquake valves.
Not authorized: Does not include forced warm-air units (see C-20).
C-57: Well Drilling Contractor
Installs and repairs water wells and pumps by boring, drilling, excavating, casing, cementing, and cleaning to provide a supply of uncontaminated water.
Verify on Official CSLB Website
License data sourced from the California Contractors State License Board. Last data update: February 20, 2026.