What path do most building engineers take?
Most people come up through the trades. A common start is a maintenance technician job in an apartment community or office building, or an HVAC helper role. You learn to read gauges, change filters, service pumps and chase work orders. After a few years you are trusted with chillers, boilers, controls and the building automation system, and the title changes to building engineer.
The Bureau of Labor Statistics files this work under stationary engineers and boiler operators. It lists a high school diploma as the typical entry education and long-term on-the-job training as the norm. Trainees start by watching temperatures and pressures on heating and cooling systems and low-pressure boilers, then move on to harder repairs once they show they can handle the basics.
How does an IUOE stationary engineer apprenticeship work?
The International Union of Operating Engineers runs stationary engineer apprenticeships through local joint committees made up equally of employer and union members. The national guidelines filed with the U.S. Department of Labor set a 4-year term with about 8,000 hours of paid on-the-job training. They also call for at least 144 hours of classroom instruction a year. Applicants must be at least 18 and hold a high school diploma or GED.
Each local sets its own intake. In Oregon and southwest Washington, IUOE Local 701 runs a registered program with an 8,000-hour term. Openings come and go, so contact your local's training coordinator directly. BLS notes that employers often prefer apprenticeship graduates because they need less training on the job.
Which certifications and licenses matter?
EPA Section 608 is the baseline credential. Federal rules require it for anyone who maintains, services, repairs or disposes of equipment containing regulated refrigerants. There are Type I, II, III and Universal certifications. Type II, Type III and Universal require a closed-book, proctored exam given by an EPA-approved certifying program. Since January 1, 2018, refrigerants including HFCs can only be sold to certified technicians.
Licensing for stationary engineers is set at the state or city level, and many places have none. Where licenses do exist, there are usually several classes, and each class limits the size and type of equipment you can run without supervision. Moving to a new state or city may mean passing a new exam. BOMI's Systems Maintenance Technician (SMT) designation covers HVAC, plumbing, electrical and controls and has no experience requirement to enroll. The Systems Maintenance Administrator (SMA) builds on it.
How do you move up?
According to BLS, engineers advance by earning higher license classes that let them run larger and more varied equipment. Where there is no license, employers use their own exams to decide who can operate which boilers. The top-class engineer can run a whole large facility and supervise others. In commercial buildings, the next steps are chief engineer, then director of engineering or facilities manager. At that level, budgets, vendor contracts and energy reporting take up as much time as the mechanical room.
Pay
USD a year, before tax. Anchor rows are BLS OEWS May 2025, moved to 2026 with the Employment Cost Index. The facilities series is the closest match for this role. It mostly reflects chief engineers and facilities managers, so a working building engineer will usually earn closer to the stationary engineer median from the BLS Occupational Outlook Handbook. License class, union coverage and building size move pay the most. Refer to the Facilities & Building Engineering salary guide for figures from live adverts.
What you need
- EducationA high school diploma or equivalent is the usual minimum. BLS recommends taking math, science and mechanical courses, and vocational or college courses help you advance later.
- EPA Section 608This federal certification is required to service equipment containing regulated refrigerants. Type II, Type III and Universal certifications require a proctored, closed-book exam.
- Apprenticeship or on-the-job trainingAn IUOE stationary engineer apprenticeship runs 4 years, with about 8,000 hours of on-the-job training and at least 144 classroom hours a year. Applicants must be 18 or older.
- State or city licenseThis applies only where your jurisdiction requires one. Licenses come in classes tied to equipment size, and applicants usually need documented experience and a passing written exam.
- BOMI SMT (optional)This designation covers every major building system. There is no experience requirement to enroll, and courses can be taken online or in a classroom.
State by state
| Massachusetts | The Department of Fire Services licenses First, Second and Third Class Engineers. Applicants must be 18 or older and U.S. citizens, pass written and oral exams, and get an endorsement from a holder of an equal or higher license. Fees are $100 for Third Class and $150 for First or Second Class, with renewal at $90. |
|---|---|
| Oregon and southwest Washington | No state license was confirmed in our sources. IUOE Local 701 runs a registered 8,000-hour stationary engineer apprenticeship, approved by Oregon's Bureau of Labor and Industries. |
How to get there
- Year 0-1Get a maintenance or HVAC helper jobStart as an apartment maintenance technician, porter-to-tech, or HVAC helper. Earn a high school diploma or GED if you don't have one, since apprenticeships require it.
- Year 1Pass EPA Section 608Earn Universal certification if you can, so you are cleared for every equipment type you might service.
- Year 1-5Enter an apprenticeship or engineer trainee roleApply to an IUOE stationary engineer apprenticeship, or take an assistant engineer job in a large building where you can learn under a licensed engineer.
- Year 2-6Earn a license where one is requiredStart at the lowest license class your city or state offers, then test up as your logged hours grow.
- Year 3-7Add BOMI SMT or SMAUse these designations to show employers you know every building system and can manage energy and safety issues.
- Year 7+Move to chief engineerRun the engineering team for one building or a portfolio. Your work shifts toward budgets, vendors and capital planning.
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Questions people ask
Do you need a degree to become a building engineer?
No. BLS lists a high school diploma or equivalent as the typical entry education, and most people learn on the job or through an apprenticeship. College or vocational courses can help when you go after chief engineer roles.
How long is a stationary engineer apprenticeship?
Under the IUOE national guidelines, the term is 4 years with about 8,000 hours of on-the-job training. It also includes at least 144 hours of classroom instruction each year.
Is EPA 608 certification required for building engineers?
Yes, if you work on equipment containing regulated refrigerants, which covers most HVAC work. Since 2018, refrigerants including HFCs can only be sold to certified technicians. Existing 608 holders did not have to retest when the rules changed.
Does every state require a stationary engineer license?
No. Some state and local governments license stationary engineers and many do not. Where licenses exist, they come in classes that limit the equipment you can run alone, and moving to a new jurisdiction can mean passing a new exam.
Is the BOMI SMT worth getting?
It's optional and has no experience requirement, which makes it a practical credential for technicians moving into engineering. It covers HVAC, plumbing, electrical and controls. Holders can go on to the SMA designation, which adds energy management and administration.
Sources
- U.S. Bureau of Labor Statistics: Stationary Engineers and Boiler Operators
- U.S. Department of Labor: IUOE stationary engineer apprenticeship guidelines
- Oregon BOLI: IUOE Local 701 Stationary Engineer JATC
- eCFR: 40 CFR Part 82 Subpart F, Appendix D, technician certification
- O*NET: EPA Section 608 Certification
- National Apartment Association: EPA regulations for handling HFCs
- Mass.gov: Apply for Fireman and Engineer Licenses
- BOMA: Systems Maintenance Technician designation
- BOMI International: Systems Maintenance Administrator (SMA)
