2022 NAICS national industry in sector 23 Construction

237990 Other Heavy and Civil Engineering Construction

NAICS 237990 is the US industry code for other heavy and civil engineering construction. It covers establishments primarily engaged in heavy and civil engineering construction projects (excluding highway, street, bridge, and distribution line construction).

Code
237990 (2022 NAICS)
Title
Other Heavy and Civil Engineering Construction
Part of
Other Heavy and Civil Engineering Construction
SBA small business limit
Average annual receipts up to $45 million (plus 1 exception, below)
Closest UK SIC
43120 (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 industry comprises establishments primarily engaged in heavy and civil engineering construction projects (excluding highway, street, bridge, and distribution line construction). The work performed may include new work, reconstruction, rehabilitation, and repairs. Specialty trade contractors are included in this industry if they are engaged in activities primarily related to heavy and civil engineering construction projects (excluding highway, street, bridge, distribution line, oil and gas structure, and utilities building and structure construction). Construction projects involving water resources (e.g., dredging and land drainage), development of marine facilities, and projects involving open space improvement (e.g., parks and trails) are included in this industry.

Examples Census gives

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:

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

Activities listed under 237990

The Census index assigns these 77 activities to this code. If your business matches one, this is your code.

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 237990

To count as a small business for SBA loans and federal contracts under NAICS 237990, your business (including affiliates) must not exceed $45 million in average annual receipts. Check your business.

Exceptions within 237990
ActivitySize standard
Dredging and Surface Cleanup Activities$37 million

SBA footnote 2: NAICS code 237990 – Dredging: To be considered small for purposes of Government procurement, a firm or its similarly situated subcontractors must perform at least 40 percent of the volume dredged with their own equipment or equipment owned by another small dredging concern.

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: 4210, 4220, 4290, 4312), so treat them as a starting point and check the definition.

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

Data last changed November 14, 2026. How this page is built.