NAICS Code 423330 — Roofing, Siding, and Insulation 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 42333 (Roofing, Siding, and Insulation Material Merchant Wholesalers).

Code	423330
Title	Roofing, Siding, and Insulation Material Merchant Wholesalers
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	225 employees

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in the merchant wholesale distribution of nonwood roofing and nonwood siding and insulation materials.

Cross-References.

Is a business under 423330 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 423330 qualifies as a small business if it does not exceed 225 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 423330 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	42333	Roofing, Siding, and Insulation Material Merchant Wholesalers
National Industry	423330	Roofing, Siding, and Insulation 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
5033	Roofing, Siding, and Insulation Materials

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.