C-4 — Boiler, Hot Water Heating and Steam Fitting Contractor
Compliance obligations for California C-4 (Boiler, Hot Water Heating and Steam Fitting Contractor) contractors. Keep every deadline tracked to stay licensed and avoid penalties.
Compliance Obligations
| Obligation | Agency | Cycle | Fee |
|---|---|---|---|
| CSLB Contractor License Renewal | Contractors State License Board (CSLB) | 2 years | $450 |
| Contractor License Bond | Contractors State License Board (CSLB) | continuous | $25,000 |
| Bond of Qualifying Individual | Contractors State License Board (CSLB) | continuous | $25,000 |
| LLC Employee/Worker Bond | Contractors State License Board (CSLB) | continuous | $100,000 |
| Workers' Compensation Insurance | Department of Industrial Relations (DIR) | annual | Varies by classification and payroll |
Workers' Compensation
Workers' comp is required for C-4 contractors.
Mandatory date: 2028-01-01 (Phase 2). Contractors with employees must carry workers' compensation insurance at all times.
Scope of Work
View full statutory scope of work ▼
A boiler, hot-water heating and steam fitting contractor installs, services and repairs power boiler installations, hot-water heating systems and steam fitting, including fire-tube and water-tube steel power boilers and hot-water heating low pressure boilers,steam fitting and piping, fittings, valves, gauges, pumps, radiators, convectors, fuel oil tanks, fuel oil lines, chimneys, flues, heat insulation and all other equipment, including solar heating equipment, associated with these systems.
Track your C-4 deadlines automatically.
PermitCal pre-loads every compliance deadline for C-4 (Boiler, Hot Water Heating and Steam Fitting Contractor) contractors. Join the waitlist.
City Business Licenses
In addition to state requirements, you may need a city business license.
Renewal: January 1 (calendar year)
Renewal: May 31 (registration renewal); March 1 (annual business tax return)
Renewal: January 1 (calendar year)
Renewal: December 31 (calendar year)
Renewal: March 1 (annual)
Renewal: January 31 (calendar year, certificate expires December 31)
Renewal: March 1 (calendar year)
Renewal: Anniversary of license issue date (annual)
Renewal: July 31 (fiscal year ending June 30)
Renewal: Anniversary of issue date (rolling annual renewal)
Renewal: January 31 (calendar year, renewal notices mailed in November)
Renewal: April 1 (fiscal year April 1 - March 31)
Renewal: Anniversary-based (rolling annual expiration)
Renewal: Annual (due first day of month after expiration) or quarterly (Jan 1, Apr 1, Jul 1, Oct 1)
Renewal: June 30 (fiscal year July 1 - June 30, renewal due July 31)