2022 NAICS national industry in sector 31-33 Manufacturing
321114 Wood Preservation
NAICS 321114 is the US industry code for wood preservation. This U.S.
- Code
- 321114 (2022 NAICS)
- Title
- Wood Preservation
- Part of
- Sawmills and Wood Preservation
- SBA small business limit
- Up to 550 employees
- Closest UK SIC
- 16100 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This U.S. industry comprises establishments primarily engaged in (1) treating wood sawed, planed, or shaped in other establishments with creosote or other preservatives, such as alkaline copper quat, copper azole, and sodium borates, to prevent decay and to protect against fire and insects and/or (2) sawing round wood poles, pilings, and posts and treating them with preservatives.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in manufacturing wood products (except round wood poles, pilings, and posts) and treating them with preservatives are classified elsewhere in Subsector 321, Wood Product Manufacturing, based on the related production process.
Activities listed under 321114
The Census index assigns these 25 activities to this code. If your business matches one, this is your code.
- Bridge and trestle parts, wood, treating
- Creosoting of wood
- Crossties, treating
- Flooring, wood block, treating
- Millwork, treating
- Mine props, treating
- Mine ties, wood, treated, manufacturing
- Pilings, foundation and marine construction, treating
- Pilings, round wood, cutting and treating
- Pilings, wood, treating
- Poles, round wood, cutting and treating
- Poles, wood, treating
- Posts, round wood, cutting and treating
- Posts, wood, treating
- Preserving purchased wood and wood products
- Pressure treated lumber made from purchased lumber
- Railroad ties (i.e., bridge, cross, switch) treating
- Structural lumber and timber, treating
- Ties, wood railroad bridge, cross, and switch, treating
- Timber, structural, treating
- Treating purchased wood and wood products
- Treating wood products with creosote or other preservatives
- Trestle parts, wood, treating
- Wood fence (i.e., pickets, poling, rails), treating
- Wood products, creosoting purchased wood products
SBA size standard for 321114
To count as a small business for SBA loans and federal contracts under NAICS 321114, your business (including affiliates) must not exceed 550 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: 1610), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.