New Construction Plumbing: Rough-In, Top-Out and Trim as a Career

A new construction plumber installs plumbing systems in buildings being built, rather than repairing systems in buildings already standing.

The job follows the construction sequence: set the pipes below ground first, run the drain-waste-vent and water piping through the open framing, then come back after the walls are finished to set fixtures and make everything work.

On the job title list, this lane includes the production crews on new subdivisions, the commercial crews on offices and towers, and the underground specialists who connect it all to the mains.

The segment sits inside one licensed trade, but the licence itself can carry scope limits that matter exactly here.

Texas, for example, licenses a Tradesman Plumber-Limited whose holders may construct, install, repair, service or renovate plumbing for one- and two-family dwellings under the supervision of a Responsible Master Plumber, and Utah licenses separate Residential Journeyman and Residential Master classes alongside its general journeyman and master tiers.

What a residential-scoped class like that covers — and what you need to work beyond it — is set by the state that issues it.

The residential plumber and commercial plumber guides cover the two settings; this page covers the build side they share.

The trade's other half, keeping occupied buildings running, is the service lane, and it runs on a different rhythm: diagnosis and repair instead of install-and-move-on.

If you are starting from zero, the plumber career guide maps the whole trade — the licence ladder, every job title and every work setting.

This page stays on the construction segment: what each stage of the build involves, how the crews and pay are organized, and whether it is a good first job.

Every build starts below grade.

The underground stage sets the piping that goes in before the foundation is poured: the building drain lines running under the slab or basement floor, the sewer connection out to the main, and the water service bringing supply in from the street.

Getting this stage right matters — the pipe ends up buried in concrete or dirt, so depth, slope and joints have to be correct before anyone backfills.

Underground work is where new construction plumbers learn to read a site plan instead of a floor plan, and where trenching, bedding and grade-checking become daily skills.

On larger projects the site's water and sewer mains are a separate crew's job altogether.

BLS counts the workers who lay those mains as their own occupation — Pipelayers, SOC 47-2151, median $23.56 an hour or $49,000 a year in May 2025.

That is mains work, not building plumbing, but the two kinds of crew can end up on the same site.

Rough-in is the heart of the job.

Once the framing is standing and before insulation and drywall close the walls, the crew runs the drain-waste-vent system and the water supply piping through the studs, joists and ceiling cavities — setting the connections for every toilet, sink, tub and appliance the plans call for.

The stage ends with the system filled and tested, ready for the rough-in inspection.

Top-out is the trade's name for finishing that rough plumbing: extending the vent stacks through the roof, making the final tie-ins at the top of the system, and leaving the piping ready to test and inspect.

Names shift by region and contractor — some shops say stack-out, some use top-out for the whole rough phase, and some split the crew that does it — but the work is the same: complete the system in the open framing so it can pass inspection before anything gets covered.

Rough-in is also the stage where reading blueprints becomes the morning routine.

Routing, elevations and fixture locations all come off the engineer's drawings, and the routing has to be coordinated with the electricians and HVAC crews running through the same wall cavities.

Trim — some contractors call it trim-out or set-out — is the return trip after the walls are closed, painted and finished.

The crew installs the fixtures and makes the plumbing live: setting toilets and lavatories, hanging faucets and shower trim, setting the water heater, connecting the dishwasher and the disposal, and testing every drain and supply one last time.

What rough-in built hidden, trim makes visible, and the finish quality is what the owner sees.

Trim work rewards a different hand than the earlier stages.

The piping decisions are already made, so the job is precision, clean finishes, and a punch list worked down to zero before the final inspection signs the building off.

On production housing the same trim sequence repeats unit after unit; on commercial work, fixtures and equipment arrive on the building's schedule and the stage stretches across weeks.

New construction plumbing is crew work, sequenced by the builder's schedule: underground when the site is open, rough-in when the framing frees up, trim when the finishes land.

The pace is production pace — the same floor plans repeat across a subdivision, and the crew that moves cleanly stage to stage is the crew that gets the next phase.

"Production pay" means bonuses tied to schedules or output.

If an offer includes one, how it is earned, on what measure, and when it is paid are questions to ask before you sign — the statistics cannot answer them for you.

Federal wage data measure such bonuses only by category: OEWS wages include base pay, commissions, production bonuses and incentive pay, while overtime pay, shift differentials and nonproduction bonuses like sign-on money are excluded.

The published categories don't settle where a schedule bonus falls, and earnings in a heavy-overtime year can exceed the OEWS figures.

Now the honest limit: there is no "new construction plumber salary" in BLS statistics.

The Occupational Employment and Wage Statistics program publishes one combined occupation — Plumbers, Pipefitters, and Steamfitters, SOC 47-2152 — and no separate wage for service versus new construction.

Across 465,840 wage-and-salary jobs in May 2025 (released May 15, 2026), that combined occupation shows a median of $30.67 an hour, or $63,800 a year, with the 10th percentile at $21.22 an hour ($44,150 a year) and the 90th at $52.13 an hour ($108,420).

The 75th percentile was $85,110, so somewhere between 10% and 25% of the trade earned $100,000 or more in OEWS-measured pay; BLS does not publish the exact share.

The closest cut to employer type is industry, and it still mixes settings.

BLS's May 2025 median annual wages for the combined trade, by top industry:

• government (excluding education and hospitals): $71,660
• manufacturing: $65,770
• heavy and civil engineering construction: $63,270
• plumbing, heating, and air-conditioning contractors: $63,010

At the plumbing-and-HVAC-contractor industry alone (NAICS 238220) — the employers that hold most of these jobs — the combined occupation counted 330,570 jobs.

Different employers, one combined table; the full national and state versions are on our plumber salary page.

Union statistics come from BLS's CPS tables, and those publish only broad occupation groups — no plumber-specific rate.

In 2025, 16.4% of wage-and-salary workers in construction and extraction occupations were union members (17.4% represented by a union), and 12.5% of workers in installation, maintenance, and repair occupations were members (13.6% represented).

Neither number is the trade's.

Full-time union members in construction and extraction occupations had median weekly earnings of $1,561 versus $1,004 for non-union workers in the same broad group (BLS CPS) — a raw comparison across a mixed occupation group, not a plumber-specific premium.

Our plumbers and pipefitters union guide covers how UA membership works.

Construction employment is project employment.

Contractors staff crews to a backlog of builds, and when a project's plumbing is done the crew rolls to the next site.

That is the job's structure, and it is also its honest weakness: the span between one project's finish and the next's start, and the way the segment rides the local build cycle, is real.

Our research vault does not quantify layoff or seasonality rates for this segment, so we will not invent numbers here; what the vault does have is the outlook data below.

What the data does measure is steady.

In 2025, 65% of the trade's jobs were with plumbing, heating and air-conditioning contractors and 8% of workers were self-employed, out of 510,600 total jobs including the self-employed.

BLS projects the occupation to grow 6.8% from 2025 to 2035 — faster than the 3.5% average across all occupations — with about 42,000 openings a year on average.

Practically, the levers are the ones the work itself suggests: build skills across all the stages so more crews can use them, keep contacts across more than one contractor, and be ready to cross between the build side and the service side when the local cycle turns.

The licence you earn is what makes those moves possible — subject to the scope limits above, so confirm what your class covers with the board that issued it.

The case for it is the sequence: the stages hand you the whole trade in order — you see the system go in the ground, then through the framing, then finished behind the fixtures, on building after building.

Repetition builds speed, and whether the hours you log count toward a journeyman licence is set by your state licensing board — or your city or county, where licensing is local — so register and document them as it requires.

Career and pay information, not legal or licensing advice. Requirements and wages vary by state, city and employer — confirm what applies to you with your state licensing board, or the city or county where licensing is local, before you make a decision.