Michigan Government & Commercial Welding, Structural Fab, Millwright & HVAC Bids

We monitor SIGMA VSS & MDOT, USACE Detroit District (Soo Locks) & MDOT, and local county/utility boards every morning at 7:00 AM Eastern so Michigan mobile rig welders, structural steel fabricators, and mechanical contractors never miss an open T&M or lump-sum solicitation.

Key NAICS & Commodity Codes for Michigan (MI) Bidders

• NAICS 238990 — All Other Specialty Trade Contractors (Primary code used by Michigan counties, airports, and water authorities for multi-year On-Call Welding T&M contracts)
• NAICS 332312 — Fabricated Structural Metal Manufacturing (DOT bridge diaphragms, bearings, handrails, and structural steel shop fab)
• NAICS 238120 — Structural Steel & Precast Concrete Contractors (Field welding, structural erection, lock/dam gate repairs)
• NAICS 238220 — Plumbing, Heating & Air-Conditioning Contractors (VA Medical Center ASME Section IX welded steam/heating pipe & boiler plant repairs)
• NAICS 238290 / 811310 — Industrial Millwright & Commercial Machinery Welding Repair
• NIGP 914-85 — State & Municipal Welding Services (SIGMA VSS & MDOT)

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