Sheet Metal Worker Job Description

A sheet metal worker turns flat coils and sheets of galvanized steel, aluminum, stainless and copper into parts that move air or shed water. On a commercial building that means the supply, return and exhaust ductwork carrying air from rooftop units and air handlers to every room. It also means the metal on the outside of the building: coping caps, gutters and downspouts, through-wall flashing, standing-seam roof panels and wall cladding. The same craft covers kitchen exhaust hoods, industrial fume systems and the casings around big mechanical equipment.

In the fabrication shop

Shop work looks like light manufacturing. A detailer pulls dimensions from the coordinated model, and the shop crew turns them into rectangular sections, round and spiral pipe, and fittings: elbows, transitions, offsets, wyes and plenums. BLS notes that some fabrication shops run automated machinery, such as computer-controlled saws, lasers, shears, and presses, which measure, cut, bend and fasten the metal. A person still sets up each machine, checks gauge and seam type against the spec, labels every piece for its spot on the floor plan, and catches the pattern that will not fit the opening waiting for it in the field.

On the job site

Field crews set inserts or beam clamps, hang threaded rod and strut, and raise sections into place from scissor lifts and boom lifts. Joints get drive cleats, slips, flanges or welded seams, followed by mastic, tape or gaskets. Where a duct passes through a rated wall, floor or shaft, the crew installs fire or smoke dampers and the access doors that let inspectors and service techs reach them later. On a large project the sheet metal foreman sits in coordination meetings with plumbers, electricians and sprinkler fitters to settle who gets which inches of the ceiling cavity, because a large duct main is difficult to reroute once other trades have hung their work.

Specialty branches

Some workers settle into one lane. Architectural sheet metal workers handle roofing and building envelope metal, often in copper or prefinished steel, where every visible seam and hem has to look right from the street. Kitchen exhaust crews build welded grease duct for restaurants and commercial kitchens. Others move into testing, adjusting and balancing, measuring airflow at grilles and diffusers and setting dampers until a system meets its design numbers. Service and maintenance workers repair, clean and reseal duct systems already in place.

Working conditions

The work is physical and hard on hands, knees and shoulders. BLS lists cuts from sharp metal, burns from soldering or welding, and falls from ladders or scaffolding as common injuries in the occupation. Field workers spend long stretches overhead and inside buildings that are not yet heated or cooled, while shop workers stand at machines around noise and moving parts. Cut-resistant gloves, safety glasses and hearing protection are daily gear, and a harness comes out whenever the work moves to an open edge or a roof.

BLS says sheet metal workers employed in construction typically learn their trade through an apprenticeship, while those working in manufacturing typically learn on the job or at a technical school. A high school diploma or equivalent is the usual starting point. Algebra, geometry and some comfort reading drawings help on an apprenticeship entrance test and every day after it.

The registered apprenticeship

On the union side, local joint apprenticeship committees run programs under National Guideline Standards developed by the International Training Institute (ITI), the training organization whose programs are jointly funded by SMACNA (the Sheet Metal and Air Conditioning Contractors' National Association) and SMART (the International Association of Sheet Metal, Air, Rail and Transportation Workers). The 2024 revision of those standards uses a hybrid approach that blends time and demonstrated competency: a term of either 4 or 5 years, a minimum of 6,400 hours of on-the-job learning, and at least 144 hours of related instruction every year. Apprentices learn construction basics such as blueprint reading, math, building code requirements, and safety and first aid, and some programs add welding. Pay rises in steps as hours and classes are completed.

Non-union contractors may run their own registered programs or train helpers on the job. Before signing on, check that a program is registered with the U.S. Department of Labor or your state apprenticeship agency and ask what credential you receive at completion.

Credentials after journey level

Journey workers can keep building their resumes. ITI's advanced training list includes testing, adjusting and balancing, HVAC fire life safety, infection control risk assessment (ICRA) and Building Information Modeling (BIM) courses. Third-party certifications in the trade include those of the International Certification Board (ICB), whose credentials include TABB Technician, Fire and Smoke Damper Technician, and Duct Air Leakage Testing (DALT) Technician. An OSHA 10-Hour Construction card from OSHA's voluntary Outreach Training Program is a sensible early credential for anyone new to job sites.

Skills that set people apart

• Layout geometry: developing transitions, offsets and odd fittings by triangulation and parallel-line methods, by hand and in software.
• Reading coordinated BIM models and shop drawings well enough to spot a clash before metal gets cut.
• Working knowledge of SMACNA's HVAC Duct Construction Standards and the mechanical code your jurisdiction has adopted.
• Clean welds and solder joints on stainless, aluminum and copper.
• Safe rigging and lift operation for overhead installs.

A rough timeline

As a rough guide, first-year apprentices split time between the shop and basic field tasks, take on full installs by the middle of the program, and reach journey level at the end of the term. Foreman, detailer and estimator roles typically follow several years of journey-level work.

BLS counted about 131,100 sheet metal worker jobs in 2025 and projects employment to grow 3 percent from 2025 to 2035, which it rates as about as fast as the average for all occupations. That is a projected gain of 3,300 jobs over the decade. Openings tell the bigger story for job seekers: BLS expects about 9,800 openings a year on average, with many of them resulting from the need to replace workers who transfer to different occupations or exit the labor force, such as to retire.

Where the jobs are

Construction holds the largest share of the work. BLS reports that specialty trade contractors employed 56 percent of sheet metal workers in 2025, manufacturing 23 percent, self-employed workers 8 percent, government (excluding state and local education and hospitals) 5 percent, and construction of buildings 3 percent. For a job seeker, that split matters. Construction work follows the bid calendar and the regional project pipeline, while manufacturing roles track a plant's production schedule and product line.

Factories and model-driven jobs

SMACNA's March–April 2026 issue of SMACNews said that in the race to build the factories of the future, from cannabis grow operations to lithium battery plants, success often depends not on software or robotics but on something more elemental: air. The same issue profiled a project where, by the estimate of a project manager at Evergreen quoted in the article, roughly 60 percent of the under-slab ductwork and approximately 90 percent of the in-slab ductwork was prefabricated directly from BIM models and delivered before the surrounding walls were formed. Those are single-project figures, not industry averages, but they show what a model-driven job asks of the people installing it: the field crew has to set every piece exactly where the model says.

Automation in the shop

Fab shops are adding equipment. A plant manager at Harris, writing in ACHR News in January 2026, said more automation and even some robotic welders are making their way into mechanical fabrication shops, and that early AI-driven machinery is beginning to filter in and can help offset the effects of skilled labor shortages. In those shops someone still programs and sets up the machines, checks output against the drawings and stages the load for the truck. Field installation is still done by crews on lifts.

Heat on the job

Crews on roofs and inside buildings without working HVAC deal with heat exposure through the summer. OSHA published a proposed standard, Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings, on August 30, 2024. It held a virtual public hearing in June and July 2025 and accepted additional comments through October 30, 2025. The Congressional Research Service's insight on OSHA heat regulation, updated August 18, 2026, said no further action had been taken on the proposal and that OSHA did not have any specific heat exposure standards. As of that update, the federal heat rule was still a proposal, not an enforceable standard.

Moving up

The trade offers several paths off the tools. Journey workers can move into foreman and general foreman roles, become detailers who build fabrication models, train as testing and balancing technicians, or step into estimating and project management with a contractor. Each of those paths starts with the same base: knowing how a fitting gets made and how it goes up.

Dear Hiring Manager,

I am applying for the Sheet Metal Worker opening at [Company]. I topped out of my apprenticeship last spring and have spent the time since as a journey-level installer on commercial HVAC work, mostly overhead on mains and branch duct in office and school buildings.

My shop rotation as an apprentice is the part of my training I lean on most. I spent a full year on the plasma table, the brake and the Pittsburgh machine, and I learned to lay out transitions by hand before the software did it for me. That habit pays off in the field. When a fitting arrives that does not match the opening, I can usually tell whether the drawing, the shop or the building moved, and I can fix it without stopping the crew.

On my current project, a three-story middle school, I ran a two-person crew installing the second-floor supply system. I set hangers from the coordination drawings, worked out a ceiling conflict with the sprinkler fitter before either of us had to cut anything, and kept our damper and access door locations matched to the fire-rated wall plan so the inspection went through on the first visit.

I want to grow toward testing and balancing and, eventually, a foreman role. [Company]'s work on labs and healthcare buildings is the kind of demanding air-side work where I think I can learn the most, and your reputation for clean, well-documented installs is the reason I am writing.

I hold a current OSHA 10-hour card and am comfortable on scissor and boom lifts. I would welcome the chance to talk with you about the role.

Thank you for your time,

[Your Name]