Two pipe trades — very different work environments, codes, and career paths. Here's how to tell them apart and choose the right one.
| Factor | Plumber | Pipefitter |
|---|---|---|
| Training hours required | 8,000 hrs (~~4 years) | 8,000 hrs (~~5 years) |
| National median salary | $59,880/yr | $61,550/yr |
| Apprentice wage range | $17–$26/hr | $18–$28/hr |
| Journeyman wage range | $26–$42/hr | $28–$46/hr |
| Primary code | UPC or IPC (plumbing code) | ASME B31 piping codes |
| Work environment | Residential and commercial buildings | Industrial plants, power stations, refineries |
| Welding required? | Rarely | Often (ASME/AWS certification) |
| Union organization | UA (United Association of Plumbers and Pipefitters) | UA (United Association of Plumbers and Pipefitters) |
| Travel required? | Local (residential service) | Often — industrial shutdowns, power plants |
| Training cost (union) | $0–$3,000 (UA apprenticeship programs are typically free) | $0–$2,000 (UA apprenticeship is free; independent candidates pay prep course costs) |
Plumbers install, repair, and maintain water supply, drain/waste/vent (DWV), and gas piping systems primarily in residential homes, apartment buildings, and commercial structures. They work with PVC, copper, PEX, and cast iron pipe on systems that operate at relatively low pressures.
Plumbing is service-oriented: much of the work is diagnosing and repairing existing systems (leaks, clogs, water heater replacements, fixture installations) in addition to new construction rough-in and finish plumbing.
Pipefitters install and maintain high-pressure industrial piping systems: steam lines, hydraulic circuits, process piping, compressed air systems, and cooling water systems in power plants, refineries, chemical plants, and manufacturing facilities.
Pipefitting is project-oriented: major work happens during plant construction or scheduled maintenance shutdowns. This often involves travel and extended away-from-home assignments. The technical demands are higher — including blueprint reading for complex 3D piping systems and welding qualifications.
Pipefitters earn a slightly higher national median ($61,550/yr) compared to plumbers ($59,880/yr). The gap is more pronounced at the journeyman level in industrial markets, where prevailing wage rates on major industrial projects can push pipefitter wages to $50–$65/hr in high-cost states.
Plumbers who build service businesses with strong residential clientele can earn comparable or higher total income through business revenue, even if their hourly rate is lower.
Plumbing is licensed in all 50 states through state-specific boards. The exam is based on the UPC or IPC plumbing code depending on the state. The path: apprentice registration → 8,000 supervised hours → journeyman exam → license.
Pipefitting licensing is less uniform. Some states require a specific pipefitter license; others license pipefitters under a broader mechanical or plumber's license. The UA represents both trades and their apprenticeship programs often run on parallel tracks. Industrial pipefitters may also hold welding certifications (AWS/ASME) in addition to their state trade license.