NAICS 336611

Overview

The North American Industry Classification System (NAICS) is the federal standard for categorizing business establishments to produce and share statistical data on the U.S. economy. Developed under the Office of Management and Budget (OMB) with Canada and Mexico, it replaced SIC in 1997 and is maintained through periodic revisions to reflect structural changes in the economy. These standards underpin many federal statistical and administrative programs in the United States. ¹

NAICS 336611 covers establishments primarily engaged in operating shipyards—fixed facilities with drydocks and fabrication equipment—capable of building, converting, repairing, and maintaining ships (watercraft intended for other than personal or recreational use). This industry includes construction of cargo, passenger, and military vessels; significant conversion and modernization; and the production of prefabricated ship and barge sections, as well as certain offshore platforms. It excludes personal/recreational boat building. ²

See also on G2X:

• G2X — NAICS 336611 overview
• G2X — NAICS 336612 Boat Building
• G2X — PSC 1905 Combat Ships and Landing Vessels

What this NAICS covers

• Operation of shipyards with drydocks and heavy fabrication equipment.
• Construction of cargo, passenger, and military ships.
• Ship conversion, alteration, and modernization performed in shipyards.
• Ship maintenance and repair executed within shipyard facilities.
• Building floating drilling and production platforms for oil and gas.
• Production of prefabricated ship and barge sections and specialized ship services (e.g., scaling). ²

Related NAICS and PSC codes

Type	Code	Descriptor
NAICS	336612	Boat Building
NAICS	488390	Other Support Activities for Water Transportation
PSC	1905	Combat Ships and Landing Vessels
PSC	J019	Maintenance, Repair, and Rebuilding of Equipment—Ships, Small Craft, Pontoons, and Floating Docks

Note: PSC descriptors per the official Product and Service Code Manual. ³

Key exclusions (where work is classified instead)

• Personal/recreational boat manufacturing is in NAICS 336612. ²
• Ship repairs performed in floating drydocks fall under NAICS 488390. ²
• Inflatable rubber boats are in NAICS 326299. ²
• Inflatable plastics boats are in NAICS 326199. ²
• Subcontractors doing painting, joinery, carpentry, or electrical wiring are classified by the production process, not under 336611. ²

SBA small business size standard

For NAICS 336611, the SBA small business size standard is 1,300 employees (effective March 17, 2023). ⁴

NAICS 2022 implementation context

Census began publishing detailed industry statistics using the 2022 NAICS vintage in January 2024 (First Look) and expects most programs to adopt 2022 NAICS by the end of 2027; programs are revised every five years via OMB’s Economic Classification Policy Committee (ECPC). ⁵

Frequently asked questions

• What activities are included in NAICS 336611?
  NAICS 336611 includes operating shipyards that build, convert, maintain, and repair ships; it also covers prefabricated ship/barge sections and specialized shipyard services such as scaling. The term “ship” here means watercraft intended for other than personal or recreational use. ²

• How does NAICS 336611 differ from NAICS 336612?
  NAICS 336611 covers shipyards and ships (non-personal craft). NAICS 336612 covers boats—watercraft typically for personal or recreational use—including many activities not performed in shipyards. See also on G2X: NAICS 336612. ²

• Are repairs in floating drydocks coded under 336611?
  No. Ship repairs performed in floating drydocks are classified in NAICS 488390 (Other Support Activities for Water Transportation), not in 336611. ²

• Which PSC codes commonly align with shipbuilding and repair buys?
  Common PSCs include 1905 (Combat Ships and Landing Vessels), 1915 (Cargo and Tanker Vessels), and J019 (Ship equipment maintenance/repair). PSCs describe “what was bought” and complement the NAICS industry code. ³

Useful resources

• G2X — NAICS 336611
• U.S. Census Bureau — NAICS 336611 definition and cross-references. ²
• Census — Implementation of 2022 NAICS (overview and timeline). ⁵
• SBA — Table of Small Business Size Standards (effective March 17, 2023). ⁴
• Acquisition.gov — Product and Service Code (PSC) Manual (April 2025). ³

References

1. U.S. Census Bureau — Classifying Businesses (NAICS developed under OMB; adopted 1997; trilateral coordination). https://www.census.gov/about/history/historical-censuses-and-surveys/census-programs-surveys/economic/classifying-businesses.html
2. U.S. Census Bureau — NAICS 2022 Manufacturing sector detail (includes 336611 definition and cross-references). https://www.census.gov/naics/resources/archives/sect31-33.html
3. Acquisition.gov — Product and Service Code Manual (April 2025). https://www.acquisition.gov/psc-manual
4. U.S. Small Business Administration — Table of Small Business Size Standards (effective March 17, 2023). https://www.sba.gov/sites/default/files/2023-06/Table%20of%20Size%20Standards_Effective%20March%2017%2C%202023%20%282%29.pdf
5. U.S. Census Bureau — The Census Bureau’s Implementation of the 2022 NAICS (vintage/timeline). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html