423310 Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers

Official definition

This industry comprises establishments primarily engaged in the merchant wholesale distribution of lumber; plywood; reconstituted wood fiber products; wood fencing; doors and windows and their frames (all materials); wood roofing and siding; and/or other wood or metal millwork.

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Merchant wholesale distribution of nonwood roofing and siding materials are classified in Industry 423330, Roofing, Siding, and Insulation Material Merchant Wholesalers.
• Merchant wholesale distribution of timber and timber products, such as railroad ties, logs, firewood, and pulpwood are classified in Industry 423990, Other Miscellaneous Durable Goods Merchant Wholesalers.
• Installing doors and windows are classified in Subsector 238, Specialty Trade Contractors.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 423310

The Census index assigns these 32 activities to this code. If your business matches one, this is your code.

• Building board (e.g., fiber, flake, particle) merchant wholesalers
• Buildings, prefabricated wood, merchant wholesalers
• Cabinets, kitchen, built-in, merchant wholesalers
• Countertops, wood and wood fiber, merchant wholesalers
• Doors and door frames merchant wholesalers
• Drywall board merchant wholesalers
• Fencing, wood, merchant wholesalers
• Fiberboard merchant wholesalers
• Flooring, wood, merchant wholesalers
• Kitchen cabinets, built-in, merchant wholesalers
• Laminates, wood, merchant wholesalers
• Lumber (e.g., dressed, finished, rough) merchant wholesalers
• Millwork merchant wholesalers
• Molding (e.g., sheet metal, wood) merchant wholesalers
• Paneling merchant wholesalers
• Particleboard merchant wholesalers
• Plywood merchant wholesalers
• Prefabricated buildings, wood, merchant wholesalers
• Railings, wood, merchant wholesalers
• Roofing materials, wood, merchant wholesalers
• Screens, window and door, merchant wholesalers
• Shingles, wood, merchant wholesalers
• Siding, wood, merchant wholesalers
• Stairs, wood, merchant wholesalers
• Structural assemblies, prefabricated wood, merchant wholesalers
• Veneer, wood, merchant wholesalers
• Wallboard merchant wholesalers
• Windows and window frames merchant wholesalers
• Wood fencing merchant wholesalers
• Wood flooring merchant wholesalers
• Wood shingles merchant wholesalers
• Wood siding merchant wholesalers

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 423310

To count as a small business for SBA loans and federal contracts under NAICS 423310, your business (including affiliates) must not exceed 150 employees. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 4649, 4663), so treat them as a starting point and check the definition.

• 46491Wholesale of musical instrumentsUK SIC
• 46499Wholesale of household goods (other than musical instruments) n.e.c.UK SIC
• 46630Wholesale of mining, construction and civil engineering machineryUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

• 423320Brick, Stone, and Related Construction Material Merchant Wholesalers
• 423330Roofing, Siding, and Insulation Material Merchant Wholesalers
• 423390Other Construction Material Merchant Wholesalers