Master Plumber
We place this role between $75,000 and $115,000 a year at mid experience, before overtime, bonus and on-call.
What the job actually is.
Holds the licence the plumbing work is permitted under and carries code responsibility for it. The role combines technical authority - plan review, inspection liaison, methods and materials decisions - with supervision and, in smaller shops, estimating.
What this role pays.
That band is mid experience, built from our own engagement history. Experience and region move it - the salary calculator applies both.
The federal occupation this role reports under is Plumbers, Pipefitters, and Steamfitters (SOC 47-2152), May 2025. Nationally it reports a median of $63,800 , with the middle of the market between $44,150 and $108,420. BLS counts this job inside that occupation rather than publishing it separately, so the figures cover a slightly wider group than this exact title.
Where it pays most.
Plumbers, Pipefitters, and Steamfitters across the metros we cover, May 2025. BLS publishes a median for 100 of them and withholds the rest, where the local sample was too small to be reliable.
| Metro | Median | Employed there |
|---|---|---|
| San Jose | $107,560 | 3,830 |
| Chicago | $103,380 | 12,750 |
| Minneapolis | $101,630 | 6,730 |
| Portland | $101,010 | 4,600 |
| Boston | $96,760 | 9,200 |
| Seattle | $95,230 | 6,350 |
| Detroit | $86,370 | 5,520 |
| Madison | $85,160 | 1,590 |
| McAllen | $46,110 | 360 |
| Myrtle Beach | $48,340 | 460 |
| Little Rock | $49,190 | 890 |
BLS Occupational Employment and Wage Statistics, May 2025. The last three rows are the lowest-paying metros in the same set. Headcount is metro-wide across every industry, not this trade alone.
Master Plumber vs Journeyman Plumber (Commercial).
The licence is the job. A master is the person whose name goes on the permit, which makes this a company problem rather than a crew problem: a shop that loses its master can lose the ability to pull work in that jurisdiction until it replaces them. Licences do not move across state lines without reciprocity or re-examination, so the search is usually regional. The trade skills overlap almost entirely with a journeyman's; the search does not, because the pool is a fraction of the size and most of it is already carrying somebody else's licence.
Journeyman Plumber (Commercial): what it pays and what the search takes
Credentials that move an offer.
- State Master License
- Backflow
Licensing is a state question, not a national one. The Commercial Plumbing hiring page carries the state-by-state position, and every market page names the authority for that state.
What separates a strong candidate.
Everyone who applies for this seat will claim the experience. These are the things that distinguish the people who have it, and the questions that find out.
What to look for
- States which jurisdictions the licence covers and how it was obtained
- Has been the licence of record for a contractor, with the exposure that carries
- Can talk through a plan review conversation with an AHJ
Questions that find out
- Which jurisdictions are you licensed in, and which were reciprocity? A strong answer Names them with licence numbers and is straight about which came by reciprocity rather than examination. The distinction matters because reciprocity carries the licence but not the local amendments, and plumbing is amended locally more than most trades.
- Which plumbing code is in force where we work, and what changed in the last cycle that affects commercial jobs? A strong answer Knows which family of code is adopted here, because the two in common use differ in ways that matter, and knows it for this jurisdiction rather than the one they trained under. Then names an actual change affecting commercial work rather than saying codes get stricter.
- Describe a time you told a project manager a design would not pass. What happened? A strong answer A specific design, a specific section, raised early and in writing rather than at inspection, with an alternative offered rather than just an objection. The best versions include being overruled and turning out to be right, and what they did with that afterwards without making it a grievance.
- How do you approach a plan review comment on fixture count? A strong answer Goes back to the occupancy classification and the occupant load, because that is almost always where the disagreement actually lives rather than in the arithmetic. Replies with the calculation and the table rather than an opinion, and checks whether the architect occupancy assumption has changed since the drawings were issued.
- What changes in your process when a job carries medical gas or lab waste? A strong answer Everything tightens. Medical gas needs certified installers and certified brazers, specific cleaned materials, nitrogen purge brazing, and independent verification before the system can be used. Lab waste needs the right chemically resistant material and neutralisation. The theme: more certification, more documentation, no improvising, and nobody touches it who is not qualified.
- Cast iron or PVC on a commercial riser, beyond code minimum. How do you decide? A strong answer Raises noise first, because that is usually the real driver in a hotel, apartment or office riser and the complaint arrives after handover when it is expensive. Then fire penetration detailing, expansion, cost and labour, and what the owner will live with. Someone who only talks about price has not had the noise phone call.
- Walk me through permitting a job in a jurisdiction you have not worked in before. A strong answer Finds out which code and which amendments apply, who the authority is, what contractor registration they require, how they want submittals and how long review takes, and what their inspectors look hardest at. Rings the office and asks rather than submitting and finding out. Treats review time as a schedule activity.
- What do you check before you sign off another plumber work? A strong answer Does not sign for anything they have not seen tested. Reviews the permit and inspection record, tests what can still be tested, documents the as-found condition, and is explicit about what they will and will not put their licence against. Says the licence is the asset, in those terms or close to them.
- How do you approach a grease interceptor sizing question with the health department? A strong answer Establishes which sizing method that authority actually uses before doing any calculation, because jurisdictions differ, and confirms the method in writing. Then sizes to it, and considers pumping frequency and access, because an interceptor nobody can service becomes a violation within a year.
- What is your process for a backflow assembly that fails its annual test? A strong answer Treats it as a public health item rather than a maintenance item. Notifies, assesses whether it is repairable with certified parts or needs replacement, gets it retested by a certified tester, files the report with the water purveyor, and acts faster where the hazard is high. Does not leave a failed assembly in service quietly.
- How do you handle a code official interpreting a section differently from you? A strong answer In writing, with the text, respectfully, and up the chain to the chief inspector if it does not resolve - never as an argument on site. Accepts that the official holds the approval, and that they will be working with that office for years. Knows when the cost of being right exceeds the cost of complying.
- What is your approach to a building with recurring hot water complaints? A strong answer Maps it before touching anything: one zone or the whole building, one time of day or constant, how far from the source. Then checks recirculation - pump running, balancing valves set, check valves in the right way round - and looks hard for a crossover between hot and cold through a failed mixing valve or fixture, which is the classic cause and the one people miss for years.
- How do you decide when a repipe is cheaper than continued repairs? A strong answer Shows the arithmetic rather than a feeling. Repair frequency and cost trend, whether the failures are systemic or local, pipe material and water chemistry, the cost of disruption and damage each time, and the owner holding period. Pinholes appearing everywhere is a different conversation from one bad run.
- What do you check on another contractor rough-in before you take it over? A strong answer Photographs and documents the as-found condition before touching anything, establishes what has actually been inspected rather than installed, tests what can be tested, prices the unknowns as allowances, and limits what they warrant in writing. Does not inherit somebody else liability by being polite about it.
- How do you keep apprentices productive without putting them beyond their skill? A strong answer Matches tasks to where they actually are rather than where the schedule needs them, supervises directly on anything that gets covered or carries risk, and checks the work before it disappears into a wall. Gives responsibility in steps and is clear about what they do not touch yet.
- What is your approach to a job that needs a licensed medical gas installer? A strong answer Does not do it without the certification, and says so plainly. Brings in certified installers and brazers, and knows the independent verification is a separate requirement from the installation certification. Someone who suggests they could manage it because it is only copper has told you something important.
The mistake this seat invites
Treating the master licence as a seniority marker rather than a liability position. The person whose licence permits the work needs the authority to stop it.
Where the role goes next
Masters move into operations, estimating or ownership; the licence is what makes the last of those possible. Candidates ask this in the first conversation, and an employer who cannot answer it loses the people who had other options.
Interview kit for this role
- All interview questions for this role in the question bank.
- Printable interview scorecard built from these questions and signals.
- The Commercial Plumbing hiring kit - every role in the trade, with credentials and offer risks.
- Offer calculator starting from this role's pay band.
What the search actually takes.
We have closed 4 commercial plumbing searches in 2026 year to date, which is below the 8 we require before publishing a median. We would rather print the count than a number the sample cannot carry. The Hiring Index shows what we do and do not have.
What we have open in Commercial Plumbing right now.
3 live commercial plumbing searches on our board as of November 12, 2026. These are roles contractors have asked us to fill, not a sample set.
- Water/Wastewater Foreman - Pleasant Prairie, Wisconsin
- Senior HVAC/Plumbing Estimator - Bartlett, Tennessee
- Journeyman Plumber - Columbus, Ohio
Keep reading.
- 2026 Commercial Plumbing Salary Guide - the full benchmark by role.
- Commercial Plumbing recruiting - how we run this trade.
- Salary calculator - the band by experience and region.
- Commercial Plumbing hiring in Houston - one market in detail.
- Hiring Index - how long our searches actually take.
Other Commercial Plumbing roles we recruit
All 56 roles we recruit - every trade, every seat.
