NAICS Subsector 237: Heavy and Civil Engineering Construction

Subsector

Definition

The Heavy and Civil Engineering Construction subsector comprises establishments whose primary activity is the construction of entire engineering projects (e.g., highways and dams), and specialty trade contractors, whose primary activity is the production of a specific component for such projects. Specialty trade contractors in the Heavy and Civil Engineering Construction subsector generally are performing activities that are specific to heavy and civil engineering construction projects and are not normally performed on buildings.

Read the full definition

The work performed may include new work, additions, alterations, or maintenance and repairs. Specialty trade activities are classified in this subsector if the skills and equipment present are specific to heavy or civil engineering construction projects. For example, specialized equipment is needed to paint lines on highways. This equipment is not normally used in building applications so the activity is classified in this subsector.

Traffic signal installation, while specific to highways, uses much of the same skills and equipment that are needed for electrical work in building projects and is therefore classified in Subsector 238, Specialty Trade Contractors. Construction projects involving water resources (e.g., dredging and land drainage) and projects involving open space improvement (e.g., parks and trails) are included in this subsector.

Establishments whose primary activity is the subdivision of land into individual building lots usually perform various additional site-improvement activities (e.g., road building and utility line installation) and are included in this subsector. Establishments in this subsector are classified based on the types of structures that they construct. This classification reflects variations in the requirements of the underlying production processes.

Code facts

Part of
Codes under it
4
Contract awards
2,882 In the last 12 months
Contract obligations
$14,008,789,558 In FY2025

NAICS codes and definitions come from the U.S. Census Bureau and contract spending from SAM.gov/FPDS.

Contract obligations by fiscal year

Fiscal year Obligated
FY2027 To date $73,069,666
FY2026 $16,826,255,627
FY2025 $14,008,789,558
FY2024 $15,438,262,883
FY2023 $14,313,135,108

Top contractors by obligations

Rank Contractor Obligated, FY2026–FY2027 Share
1 Thalle Construction Co Inc. $1,983,978,115
2 Barnard Construction Company, Incorporated $1,338,826,655
3 Ferrovial Construccion PR, LLC $1,079,074,401
4 Thalle - Bauer LLC $699,345,424
5 PCL Construction Inc. $445,975,526
6 Pittman-Sealevel, L.L.C. $420,667,904
7 Kiewit Infrastructure South Co $386,899,177
8 Dragados / Hawaiian Dredging / Orion JV $355,187,394
9 Flatiron-Aecon Joint Venture $320,187,168
10 Kiewit-Alberici Siop Macc AJV $291,891,408

See the full FY2025 ranking of NAICS 237 contractors, by parent company.

Top funding agencies by obligations

Rank Agency Obligated, FY2026–FY2027 Share
1 Department of the Army Department of Defense $10,631,976,379
2 Department of the Navy Department of Defense $1,833,997,647
3 Department of the Interior $1,469,612,307
4 Department of Transportation $884,188,932
5 Department of Agriculture $618,766,230
6 International Boundary and Water Commission U.S.-Mexico $448,343,639
7 Department of Veterans Affairs $361,932,159
8 Air Force Department of Defense $253,454,076
9 Department of Homeland Security $112,628,283
10 National Aeronautics and Space Administration $94,544,247
Rank PSC code Obligated, FY2026–FY2027 Share
1 Y1KB Construction of Canals $3,139,855,382
2 Z2KA Repair or Alteration of Dams $1,892,049,181
3 Y1PZ Construction of Other Non-Building Facilities $1,654,513,551
4 Y1LB Construction of Highways, Roads, Streets, Bridges, and Railways $1,158,868,339
5 Y1KA Construction of Dams $1,070,114,059
6 Y1ND Construction of Sewage and Waste Facilities $762,024,905
7 Y1ED Construction of Ship Construction and Repair Facilities $653,075,925
8 Z2LB Repair or Alteration of Highways/Roads/Streets/Bridges/Railways $597,294,578
9 Y1KF Construction of Dredging Facilities $534,537,593
10 Z1KF Maintenance of Dredging Facilities $519,910,721

Contract obligations by state

Rank Place of performance Obligated, last 12 months Share
1 California $2,960,515,173
2 Florida $2,575,918,572
3 Puerto Rico $1,171,305,867
4 Washington $725,665,636
5 Hawaii $685,245,033
6 Louisiana $625,290,370
7 Texas $562,886,141
8 Virginia $511,339,266
9 Kentucky $430,421,716
10 Tennessee $371,593,313
11 Alaska $361,155,583
12 Wyoming $319,230,288
13 New Mexico $285,121,552
14 Oregon $279,011,386
15 Pennsylvania $249,926,805
16 North Carolina $210,920,053
17 Arizona $205,407,677
18 Maryland $202,899,532
19 Illinois $198,751,945
20 New Jersey $193,033,487
21 Mississippi $184,836,952
22 Michigan $183,441,026
23 Alabama $180,846,024
24 Missouri $176,556,586
25 Montana $175,330,001
26 South Carolina $173,429,915
27 Georgia $172,521,498
28 Arkansas $168,646,934
29 Oklahoma $157,033,178
30 New York $146,312,607
31 Colorado $134,184,440
32 Ohio $106,086,646
33 Maine $106,079,010
34 Iowa $88,785,464
35 Nevada $88,317,254
36 West Virginia $68,563,687
37 Minnesota $68,430,837
38 Idaho $66,437,621
39 Nebraska $62,651,941
40 Utah $61,296,212
41 Delaware $59,366,879
42 South Dakota $42,808,660
43 Guam $35,576,638
44 Indiana $31,896,370
45 North Dakota $30,294,946
46 Massachusetts $22,400,431
47 District of Columbia $19,879,148
48 Wisconsin $19,064,643
49 Connecticut $13,206,792
50 Kansas $12,309,124
51 Northern Mariana Islands $9,747,025
52 Rhode Island $5,129,344
53 New Hampshire $2,351,680
54 U.S. Virgin Islands $1,097,094
55 American Samoa $926,100
56 Vermont $852,519
Show all 56

Shares are of everything obligated under NAICS 237 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.

Contract opportunities

Notice Posted Due
NJ-NY ERFO FW WARI 2019-1(1) - Wallkill River National Wildlife Refuge Solicitation · Federal Highway Administration
LAKE PONTCHARTRAIN & VICINITY (LPV), FORESHORE RISK REDUCTION REPAIRS, REACH-1, 2, 3, & 4 Jefferson Parish, Louisiana (ED 24-006) Award Notice · ENDIST New Orleans (USACE) —
Great Lakes Restoration Initiative (GLRI) Monguagon Creek Upper Trenton Channel (MCUTC) Solicitation · ENDIST Detroit (USACE)
Or-malheur NWR-domestic well Solicitation
Electrical Upgrades to Support Future Three-Phase Power Supply Service at Lac qui Parle Dam near Watson, MN Pre-Solicitation · ENDIST St Paul (USACE)
W9127827SC002 FY28 Horizontal Launch Infrastructure, SPOTFi (OTA) Progressive-Design-Build OT Special Notice · ENDIST Mobile (USACE)
Tybee Island Shoreline Protection Project Solicitation · ENDIST Savannah (USACE)
NAS whiting field airfield pavement repairs Special Notice · Naval Facilities Engineering Command (Navy)
South fork bunkhouse well abandonment project Solicitation · Forest Service
USACE SPK DBB Construction - LAR C3B North - Sacramento, CA Solicitation · ENDIST Sacramento (USACE)
Cripple Creek Veg Management Roads Reconstruction Solicitation · Forest Service
Access Road Repair National Elk Refuge Solicitation
Borough of Etna, Pennsylvania, Local Protection Project (LPP) PL84-99 Rehabilitation Award Notice · ENDIST Pittsburgh (USACE) —
Barriers and Bunkers Pre-Solicitation · Air Forces Europe and Africa (USAF)
Mud Mountain Dam Sewage Lagoon Repair Solicitation · ENDIST Seattle (USACE)
GRCA 318719 North Rim & Springs Rehabilitation Pro Solicitation
Joe Pool Dam Slide Repairs Award Notice · ENDIST Fort Worth (USACE) —
CONSTRUCTION HAZMAT & AML RESPONSE IDIQ - CO, Fair Award Notice —
Road Paving IAH (Houston Bush) Airport Solicitation · Southwestern Region (FAA)
Construction of the Charleston Peninsula Coastal Storm Risk Management (CSRM) - Westside Pre-Solicitation · ENDIST Charleston (USACE)
Bill Parkin (MAK) Award Notice · Indian Health Service —
Thimble Shoal Channel Maintenance Dredging Pre-Solicitation · ENDIST Wilmington (USACE) —
GAOA Sherando Recreation Area Rehabilitation, George Washington-Jefferson National Forest Award Notice · Forest Service —
Pensacola Harbor Navigation Channel Maintenance Dredging Solicitation · ENDIST Mobile (USACE)
SAS4408 Pedestrian Bridge Replacement Solicitation · Naval Facilities Engineering Command (Navy)
FAIR Route 3 - 96-inch CMP Replacement Project Solicitation · Central Office (BIA)
Y1AZ--504-21-703 Training and Admin Support Space Construction Pre-Solicitation · Veterans Integrated Service Network 17 (VHA)
Northeast Region Pavement and Bridge Preservation Construction - NP NER PMS BMS FY25(2) Solicitation · Federal Highway Administration
Borough of Millvale, Pennsylvania, Local Protection Project (LPP) PL84-99 Rehabilitation Solicitation · ENDIST Pittsburgh (USACE)
Electrical Projects – Use of Progressive Design Build (PDB) with Other Transaction Authority (OTA) - Request for Information Pre-Solicitation · Nuclear Weapons Center (AFMC)
Z1DA--550-26-121 FY27 NRM Emergent Repairs North Water Tower 71 & South Water Tower 94 CON Pre-Solicitation · Veterans Integrated Service Network 12 (VHA)
Natchez Trace Parkway Pre-Solicitation · Federal Highway Administration
IDIQ small business set-aside MACC for paving projects at various government installations located in CA, AZ, NV, UT, CO, and NM Solicitation · Naval Facilities Engineering Command (Navy)
VI DPC A34(1) – Veterans Drive Contract 2 Improvements to RTE 30 Pre-Solicitation · Federal Highway Administration
2027-2029 Maintenance Dredging, Anchorage Harbor, Alaska Solicitation · ENDIST Alaska (USACE)
Bonneville Powerhouse II Unwatering Pump Replacement Solicitation · ENDIST Portland (USACE) · W9127N27BA012
Access Control Point (ACP) Active Vehicle Barrier (AVB) Systems and Guard Booths Pre-Solicitation · Engineering Support Center Huntsville (USACE)
Notice of Cancellation of Solicitation- Building refurbishment in Hutchinson, KS at the HTI ARSR Solicitation · Franchise Acquisition Servies (FAA)
VA-rappahannock RIV VLY NWR-HQ well drill Limited / Sole Source Justification —
RFI Other Transaction Authority (OTA) FY28 Fort Bliss Microgrid Construction Services Special Notice · ENDIST Louisville (USACE)
Avon Park Delta Ramp Repairs Award Notice · ENDIST Pittsburgh (USACE) —
Bonneville Powerhouse II Unwatering Pump Replacement Pre-Solicitation · ENDIST Portland (USACE) · W9127N27BA012 —
Denison Valve Replacement Pre-Solicitation · ENDIST Tulsa (USACE)
Mill Creek Section 205 Flood Risk Management Improvements Pre-Solicitation · ENDIST Walla Walla (USACE)
Bonners Ferry Road Grading Award Notice · Forest Service —
63100PR270000009 Repair Floating Dock Special Notice
Beach Renourishment, Kennedy Space Center, Brevard County, Florida Pre-Solicitation · ENDIST Jacksonville (USACE)
FY27 harlingen placement area (PA)13 and 10 improvements Solicitation · ENDIST Galveston (USACE)
W9123627BA004: NASA Wallops Breakwater Project in Wallops Island, Virginia Pre-Solicitation · ENDIST Norfolk (USACE)
Calcasieu Bar River Channel, Pascagoula Harbor, and Panama City Harbor Maintenance Dredging Solicitation · ENDIST Wilmington (USACE)
Show 40 more

Latest 50 of 70,944 listed here. See the rest on GovTribe.

Codes under 237

NAICS code
2371 Utility System Construction
2372 Land Subdivision
2373 Highway, Street, and Bridge Construction
2379 Other Heavy and Civil Engineering Construction

Quick answers

What is NAICS 237?

NAICS 237 is Heavy and Civil Engineering Construction, a subsector in NAICS 23, Construction.

What codes are under NAICS 237?

NAICS 237 has 4 codes under it with their own GovTribe pages, including 2371 Utility System Construction; 2372 Land Subdivision; and 2373 Highway, Street, and Bridge Construction.

How much do federal agencies spend under NAICS 237?

Federal contracts under NAICS 237 obligated $14,008,789,558 in fiscal year 2025 and $60,659,512,842 in fiscal years 2023 through 2027.

Who are the largest contractors under NAICS 237?

The contractors with the most obligated under NAICS 237 in fiscal years 2026 and 2027 are Thalle Construction Co Inc. ($1,983,978,115); Barnard Construction Company, Incorporated ($1,338,826,655); and Ferrovial Construccion PR, LLC ($1,079,074,401).

Which agencies buy the most under NAICS 237?

The agencies that obligated the most under NAICS 237 in fiscal years 2026 and 2027 are Department of the Army ($10,631,976,379), Department of the Navy ($1,833,997,647) and Department of the Interior ($1,469,612,307).

Which PSC codes are used with NAICS 237?

The PSC codes with the most obligated under NAICS 237 in fiscal years 2026 and 2027 are Y1KB Construction of Canals, Z2KA Repair or Alteration of Dams and Y1PZ Construction of Other Non-Building Facilities.

Where is the work under NAICS 237 performed?

By place of performance, the states with the most contract obligations under NAICS 237 over the last 12 months are California ($2,960,515,173), Florida ($2,575,918,572) and Puerto Rico ($1,171,305,867).

What is the latest contract opportunity under NAICS 237?

The latest contract opportunity under NAICS 237 is NJ-NY ERFO FW WARI 2019-1(1) - Wallkill River National Wildlife Refuge, solicitation from Federal Highway Administration, posted November 12, 2026.

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See everything under NAICS 237

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