9406.90.01.30/Steel Modular Office Building/Mexico

Steel Modular Office Building from Mexico

A prefabricated steel office structure finished in the factory with internal fittings like walls, doors, and electrical wiring, designed for on-site assembly into a permanent office space. It falls under HTS 9406.90.0130 as a prefabricated building of metal, other than houses or greenhouses, entered as elements to be assembled. This classification applies because it meets the definition of modular building units substantially pre-fitted internally.

Duty Rate — Mexico → United States

27.9%

Rate breakdown

9903.82.0925%Except as provided for in headings 9903.82.16, 9903.82.20–9903.82.26 and 9903.85.68, articles of copper and derivative aluminum and steel articles, as provided for in subdivisions (c)(vi)–(viii) and (xi) of U.S. note 16 to this subchapter

9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)

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Import Tips

• Verify that all modular units are entered together with assembly instructions to qualify as prefabricated buildings; obtain structural engineering certifications for compliance with US building codes

• Common pitfall: misclassifying as mere metal structures without proving prefabricated intent

• Ensure documentation shows factory pre-fitting to avoid reclassification