Before researching a specific local, it helps to know exactly which of NABTU's 14 affiliate unions actually represents your target trade (the full federation overview). Here's the fast, practical lookup.
| Union | Represents | Covered Elsewhere in This Network |
|---|---|---|
| IBEW | Electricians, linemen, electrical construction | Yes — electrical & linework spokes |
| United Association (UA) | Plumbers, pipefitters, HVAC/steamfitters, sprinkler fitters | Yes — plumbing & HVAC spokes |
| SMART | Sheet metal workers, HVAC ductwork | Partially — HVAC-adjacent |
| IUOE | Operating engineers — heavy equipment operators | Adjacent to industrial/CNC spokes |
| Iron Workers (IW) | Structural and reinforcing ironworkers | Not directly covered |
| Boilermakers | Boiler and pressure vessel construction/repair | Adjacent to industrial maintenance |
| BAC | Bricklayers, masons, trowel trades | Not directly covered |
| IUPAT | Painters, glaziers, allied finishing trades | Not directly covered |
| LIUNA | Construction laborers | Not directly covered |
| Roofers | Roofing installation and repair | Not directly covered |
| Insulators | Mechanical and thermal insulation | Not directly covered |
| IUEC | Elevator construction and maintenance | Not directly covered |
| OPCMIA | Plasterers and cement masons | Not directly covered |
| Teamsters | Construction-related transportation and hauling | Not directly covered |
If you already know your target trade, this table tells you exactly which national union to research first — and from there, which specific local in your region actually represents that trade.
What to Do With This Information
- Identify your target trade's affiliate union from the table above.
- Search for that union's specific local covering your geographic region — most national unions maintain a local-finder tool on their national website.
- Contact that specific local directly to begin the actual apprenticeship or membership inquiry process (the full process, explained).
A Note on Trades This Network Covers Without a Single Dominant Union
Several trades covered across this network's occupation-specific spokes — solar installation, wind technician work, CNC machining, automation/robotics, diesel mechanics — don't map to a single dominant NABTU-affiliate union the way electrical or plumbing do. These trades' union presence, where it exists, is often more fragmented or emerging, reflecting their comparatively newer status as organized, unionized crafts relative to century-old building trades like IBEW or the UA.
The Practical Takeaway
Use this table as your starting orientation point, then go directly to the source — the specific national union's own website — for the most current, accurate information on locals, apprenticeship programs, and jurisdiction specifics in your target region.