Delaware Plumber Salary: What Apprentices, Journeymen, and Masters Earn

Pay Jumps at Every License Level

Delaware plumber earnings follow a clear staircase pattern tied directly to credentials. Each step up the licensing ladder — from apprentice to journeyperson to master — unlocks higher-paying work, and the gaps between levels are substantial.

Master plumbers in Delaware earn wages roughly 32% above the national average for the trade, reflecting the state's strict regulatory environment and the limited number of licensed masters relative to demand.

Apprentice Wages

Apprentice plumbers in Delaware earn progressive wages that increase with experience. First-year apprentices typically start between $14 and $18 per hour, depending on the sponsoring contractor and whether the position is union or non-union.

Union apprenticeships through UA Local 74 follow a structured wage scale that increases in set increments as you advance through each year of the program. By the fourth or fifth year of an apprenticeship, wages typically reach $20 to $25 per hour before benefits.

Non-union apprentice wages vary more widely by employer. Some open-shop contractors pay at or above union scale to attract workers; others start at the lower end and increase based on performance.

Beyond hourly wages, apprentices should factor in the cost of RTI classes ($400 to $850 per year) and textbooks (around $750 total). These are out-of-pocket expenses that reduce your effective take-home during the training period.

Journeyperson Pay

After completing the apprenticeship and receiving your DOL Journeyperson Certificate, the pay range shifts to roughly $25 to $35 per hour. The exact figure depends on your employer, specialization (residential vs. commercial), and location within the state.

New Castle County and Wilmington tend to pay at the higher end of the journeyman range due to the concentration of commercial construction projects. Kent and Sussex counties are typically lower, though residential service work in beach communities can command premium rates during the summer season.

The journeyperson ceiling is real. Without a master plumber license, you cannot pull permits, sign contracts, or operate your own business. Your earning potential is capped by your employer's willingness to pay — not by the market value of the work you can bring in.

Master Plumber Earnings

The master license is where earnings break away from the hourly wage model. Licensed master plumbers working as employees typically earn $40 to $45 per hour or more. But the real financial upside comes from independent contracting.

A master plumber operating their own business sets their own rates, pulls their own permits, and captures the full margin on every job. In Delaware's market, independent master plumbers regularly bill $75 to $150 per hour for residential service calls and negotiate project-based pricing on commercial work.

The income difference between a journeyperson stuck at $30 per hour and a master plumber running their own shop is not incremental — it is the difference between trading time for wages and building equity in a business.

What Drives Delaware's Above-Average Pay

Several factors push Delaware plumber wages above the national average:

Limited supply of masters: Delaware's strict licensing requirements (two-year post-apprenticeship experience, Board review, ProV exam) limit the number of active master plumbers relative to demand.

Multi-jurisdictional permitting complexity: The state's split between DPR licensing, DPH permitting, and local county/city inspections creates administrative overhead that favors experienced practitioners who know the system.

Commercial construction concentration: New Castle County's proximity to Philadelphia drives consistent demand for commercial plumbing work, which commands higher wages than residential service.

New CE requirements: The new five-hour continuing education mandate starting in 2026 adds another compliance layer that may thin the active licensee pool further as some older practitioners choose not to renew.

Making the Jump

The financial case for advancing from journeyperson to master is straightforward. Even a conservative estimate — moving from $30/hour to $40/hour as an employed master — adds over $20,000 annually. Building your own contracting business multiplies that further.

The Delaware Plumber License Guide maps out every step of the advancement process, from documenting your experience to navigating the DELPROS application, so you can make that jump as efficiently as possible.

See more Delaware guides →