NAICS 321912

Overview

The North American Industry Classification System (NAICS) is the federal standard used to classify U.S. business establishments for statistical purposes. Developed by the U.S. Office of Management and Budget in coordination with Canada and Mexico, NAICS is revised on a five-year cycle; the current structure is the 2022 vintage, which agencies are implementing across statistical programs through 2027. ²

NAICS 321912 covers establishments primarily engaged in one or more of the following: making dimension lumber from purchased lumber; producing dimension or cut stock (shapes); resawing sawmill output; and planing purchased lumber using equipment such as jointers, planers, lathes, and routers. Agencies use this code to classify millwork operations that transform purchased lumber without operating sawmills. ¹

See also on G2X:

• G2X — NAICS 321912 overview
• G2X — NAICS 321113 (Sawmills)
• G2X — NAICS 321918 (Other Millwork)

What this NAICS covers

• Dimension lumber production from purchased lumber, not from logs. ¹
• Manufacturing dimension stock or cut stock (e.g., shaped components) from purchased lumber. ¹
• Resawing the output of sawmills into boards, planks, or other sizes. ¹
• Planing and dressing purchased lumber to specified dimensions or finish. ¹
• Shaping wood using jointers, planers, lathes, routers, or similar woodworking machinery. ¹
• Contract planing or resawing services performed on purchased lumber. ¹

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	321113	Sawmills
NAICS	321918	Other Millwork (including Flooring)
PSC	5510	Lumber and Related Basic Wood Materials
PSC	5520	Millwork

Scope notes and exclusions

• Operations that make boards, beams, timbers, ties, shingles, shakes, siding, or wood chips directly from logs/bolts are classified in NAICS 321113, not in 321912. ¹
• Millwork such as wood stairwork, moldings, trim, shutters, and wood flooring is classified in NAICS 321918. ¹
• Fabricating wood windows and doors is classified in NAICS 321911. ¹

Frequently asked questions

• What activities define NAICS 321912?
  Establishments primarily make dimension lumber from purchased stock, produce dimension or cut stock, resaw sawmill outputs, and/or plane purchased lumber using woodworking machinery. The focus is transformation of purchased lumber rather than converting logs. ¹

• How is 321912 different from 321113 and 321918?
  321912 focuses on resawing/planing purchased lumber and producing cut or dimension stock. 321113 covers making lumber directly from logs, while 321918 covers millwork like stairwork, moldings, trim, shutters, and wood flooring. ¹

• Are wood flooring or shutters included in 321912?
  No. Wood flooring and wood shutters are treated as millwork and are classified in NAICS 321918, not 321912. ¹

• How does the 2022 NAICS vintage affect 321912 data?
  Census programs began publishing statistics aligned to NAICS 2022 with the 2022 Economic Census and will complete transitions across remaining programs by the end of 2027. Users should confirm the vintage before comparing time series. ²

• How does Census group 321912 in internal industry categories?
  Within Census employer guidance, 321912 is grouped under “Millwork” alongside 321911 and 321918. ³

Useful resources

• U.S. Census Bureau — NAICS 321912 description and cross-references. ¹
• U.S. Census Bureau — Implementation of the 2022 NAICS. ²
• U.S. Census Bureau — Employer categories and corresponding NAICS industries (Millwork grouping). ³
• Acquisition.gov — Product and Service Code Manual (relevant to PSC 5510/5520). ⁴

References

1. U.S. Census Bureau — NAICS 2022: Code 321912 (search result/detail page). https://www.census.gov/naics/?input=321912&year=2022
2. U.S. Census Bureau — The Census Bureau’s Implementation of the 2022 NAICS. https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
3. U.S. Census Bureau — Employer Categories and Corresponding Establishment NAICS Industries. https://www.census.gov/programs-surveys/esp/guidance/employer.html
4. Acquisition.gov — Product and Service Code Manual. https://www.acquisition.gov/psc-manual/all