423310 — Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers
Description
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 (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- 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;
- and
- Installing doors and windows--are classified in Subsector 238, Specialty Trade Contractors.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 5031 - Lumber, Plywood, Millwork, and Wood Panels (via SIC1987:5031→NAICS1997:42131→2002:423310→2007:423310→2012:423310→2017:423310→2022:423310)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC L055 — Technical Representation Services: Lumber, Millwork, Plywood, and Veneer
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 423310 valid in 2022? ▾
Yes, 423310 is a valid 6-digit 2022 NAICS national industry code representing 'Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers' under Sector 42 in the official classification index.
What is the SBA size standard for NAICS code 423310? ▾
The Small Business Administration (SBA) has established a small business size standard of 150 employees for NAICS code 423310 (Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers), calculated based on employees.
What is the legacy SIC equivalent for NAICS 423310? ▾
According to official Census Bureau concordance tables, NAICS code 423310 (Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 5031 - Lumber, Plywood, Millwork, and Wood Panels.
Related Pages & Tools
Further regulatory reference links for NAICS code 423310:
- Sector 42 Directory Hub — List of related industries in the Wholesale Trade sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 423310 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.