NAICS Code 423390 — Other Construction Material Merchant Wholesalers

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 42339 (Other Construction Material Merchant Wholesalers).

Code	423390
Title	Other Construction Material Merchant Wholesalers
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	100 employees

Official definition (2022 NAICS)

This industry comprises (1) establishments primarily engaged in the merchant wholesale distribution of manufactured homes (i.e., mobile homes) and/or prefabricated buildings and (2) establishments primarily engaged in the merchant wholesale distribution of construction materials (except lumber, plywood, millwork, wood panels, brick, stone, roofing, siding, electrical and wiring supplies, and insulation materials).

Illustrative Examples:

Flat glass merchant wholesalers

Prefabricated buildings (except wood) merchant wholesalers

Ornamental ironwork merchant wholesalers

Fencing and fencing accessories (except wood) merchant wholesalers

Plate glass merchant wholesalers

Storage bins merchant wholesalers

Is a business under 423390 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 423390 qualifies as a small business if it does not exceed 100 employees. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — employee count is averaged over the latest 24 months.

Where 423390 sits in the hierarchy

Level	Code	Title
Sector	42	Wholesale Trade
Subsector	423	Merchant Wholesalers, Durable Goods
Industry Group	4233	Lumber and Other Construction Materials Merchant Wholesalers
NAICS Industry	42339	Other Construction Material Merchant Wholesalers
National Industry	423390	Other Construction Material Merchant Wholesalers

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
5039	Construction Materials, Not Elsewhere Classified

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.