NAICS Code 54135: Building Inspection Services
NAICS industry
Definition
This industry comprises establishments primarily engaged in providing building inspection services. These establishments typically evaluate all aspects of the building structure and component systems and prepare a report on the physical condition of the property, generally for buyers or others involved in real estate transactions. Building inspection bureaus and establishments providing home inspection services are included in this industry.
Code facts
- Part of
-
-
54
-
541
- 5413
-
541
-
54
- Codes under it
- 1
- Contract awards
- 247 In the last 12 months
- Contract obligations
- $171,685,954 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau, size standards from the SBA and contract spending from SAM.gov/FPDS.
Business activities under NAICS 541350
- Building inspection bureaus
- Building inspection services
- Energy efficiency inspection services
- Home inspection services
- Inspection bureaus, building
- Inspection services, building or home
- Prepurchase home inspection services
Looking for another activity? Search the NAICS code lookup or browse business activities from A to Z.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $12,696,170 |
| FY2026 | $202,162,568 |
| FY2025 | $171,685,954 |
| FY2024 | $155,871,153 |
| FY2023 | $175,408,046 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | National Opinion Research Center | $36,675,118 | |
| 2 | T2S, LLC | $24,825,550 | |
| 3 | OST Inc. | $22,290,493 | |
| 4 | Mathematica Inc. | $18,544,553 | |
| 5 | Vanguard Inspection Services | $17,430,391 | |
| 6 | Kearney & Company, P.C. | $14,575,579 | |
| 7 | ITC Federal, LLC | $8,516,753 | |
| 8 | Analex Corporation | $7,556,000 | |
| 9 | Heidelberg Resources, LLC | $6,525,000 | |
| 10 | WSP USA Services Inc. | $6,409,589 |
See the full FY2025 ranking of NAICS 54135 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of the Army | $59,784,344 | |
| 2 | Department of Health and Human Services | $43,676,976 | |
| 3 | Department of Homeland Security | $41,323,083 | |
| 4 | Air Force | $23,914,112 | |
| 5 | Department of Agriculture | $14,112,567 | |
| 6 | Department of Labor | $13,320,780 | |
| 7 | Department of Veterans Affairs | $7,017,202 | |
| 8 | Department of Housing and Urban Development | $3,825,922 | |
| 9 | Department of State | $2,015,483 | |
| 10 | Millennium Challenge Corporation | $1,032,970 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | AF32 Education, Training, Employment, & Social Services R&D Services; Social Services R&D; Applied Research | $40,609,612 | |
| 2 | H156 Quality Control Services: Construction and Building Materials | $35,078,707 | |
| 3 | R499 Other Professional Services | $27,622,814 | |
| 4 | AC12 National Defense R&D Services; Department of Defense – Military; Applied Research | $24,825,550 | |
| 5 | R425 Engineering and Technical Services | $22,636,096 | |
| 6 | AF21 Education, Training, Employment, & Social Services R&D Services; Training & Labor R&D; Basic Research | $13,320,780 | |
| 7 |
R408 Program Management/ |
$12,075,994 | |
| 8 | R710 Support – Management: Financial | $10,754,331 | |
| 9 | H956 Other Quality Control, Testing and Inspection Services: Construction and Building Materials | $6,631,297 | |
| 10 |
U008 Training/ |
$3,090,237 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Illinois | $37,068,053 | |
| 2 | Maryland | $34,493,669 | |
| 3 | Virginia | $30,217,753 | |
| 4 | Florida | $27,116,318 | |
| 5 | District of Columbia | $19,492,821 | |
| 6 | New Jersey | $18,693,734 | |
| 7 | Mississippi | $11,316,446 | |
| 8 | Alabama | $9,889,998 | |
| 9 | Tennessee | $7,139,387 | |
| 10 | Wisconsin | $6,838,825 | |
| 11 | Indiana | $6,706,745 | |
| 12 | Colorado | $5,921,876 | |
| 13 | Texas | $5,636,902 | |
| 14 | Louisiana | $5,110,165 | |
| 15 | California | $3,865,714 | |
| 16 | Northern Mariana Islands | $3,093,127 | |
| 17 | Washington | $2,331,093 | |
| 18 | South Carolina | $1,205,008 | |
| 19 | Puerto Rico | $968,536 | |
| 20 | Oregon | $873,959 | |
| 21 | Hawaii | $849,632 | |
| 22 | Guam | $820,394 | |
| 23 | Ohio | $491,638 | |
| 24 | North Dakota | $443,356 | |
| 25 | Nebraska | $306,228 | |
| 26 | Wyoming | $305,139 | |
| 27 | New York | $266,354 | |
| 28 | New Hampshire | $194,052 | |
| 29 | Alaska | $183,630 | |
| 30 | Oklahoma | $182,808 | |
| 31 | Idaho | $137,120 | |
| 32 | Massachusetts | $129,967 | |
| 33 | Iowa | $126,410 | |
| 34 | Arkansas | $123,379 | |
| 35 | South Dakota | $93,375 | |
| 36 | Delaware | $79,773 | |
| 37 | Utah | $78,181 | |
| 38 | Minnesota | $73,996 | |
| 39 | Arizona | $59,644 | |
| 40 | Montana | $55,329 | |
| 41 | Kansas | $42,633 | |
| 42 | New Mexico | $39,399 | |
| 43 | Maine | $33,150 | |
| 44 | Nevada | $7,299 | |
| 45 | West Virginia | $1,311 |
Show all 45
Shares are of everything obligated under NAICS 54135 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 37 more
Latest 47 of 2,220 listed here. See the rest on GovTribe.
Codes under 54135
| NAICS code | Size standard |
|---|---|
| 541350 Building Inspection Services | $11.5 million in average annual receipts |
Quick answers
What is NAICS 54135?
NAICS 54135 is Building Inspection Services, a NAICS industry in NAICS 54, Professional, Scientific, and Technical Services.
What is the NAICS code for home inspection services?
The NAICS code for home inspection services is 541350, Building Inspection Services. Its SBA small business size standard is $11.5 million in average annual receipts.
What is the NAICS code for building inspection bureaus?
The NAICS code for building inspection bureaus is 541350, Building Inspection Services. Its SBA small business size standard is $11.5 million in average annual receipts.
What is the NAICS code for prepurchase home inspection services?
The NAICS code for prepurchase home inspection services is 541350, Building Inspection Services. Its SBA small business size standard is $11.5 million in average annual receipts.
What codes are under NAICS 54135?
NAICS 54135 has one code under it with its own GovTribe page, 541350 Building Inspection Services.
How much do federal agencies spend under NAICS 54135?
Federal contracts under NAICS 54135 obligated $171,685,954 in fiscal year 2025 and $717,823,892 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 54135?
The contractors with the most obligated under NAICS 54135 in fiscal years 2026 and 2027 are National Opinion Research Center ($36,675,118); T2S, LLC ($24,825,550); and OST Inc. ($22,290,493).
Which agencies buy the most under NAICS 54135?
The agencies that obligated the most under NAICS 54135 in fiscal years 2026 and 2027 are Department of the Army ($59,784,344), Department of Health and Human Services ($43,676,976) and Department of Homeland Security ($41,323,083).
Which PSC codes are used with NAICS 54135?
The PSC codes with the most obligated under NAICS 54135 in fiscal years 2026 and 2027 are AF32 Education, Training, Employment, & Social Services R&D Services; Social Services R&D; Applied Research; H156 Quality Control Services: Construction and Building Materials; and R499 Other Professional Services.
Where is the work under NAICS 54135 performed?
By place of performance, the states with the most contract obligations under NAICS 54135 over the last 12 months are Illinois ($37,068,053), Maryland ($34,493,669) and Virginia ($30,217,753).
What is the latest contract opportunity under NAICS 54135?
The latest contract opportunity under NAICS 54135 is H961--Tri-Annual Electrical Inspection, solicitation from Veterans Integrated Service Network 21 (VHA), posted November 10, 2026.
On GovTribe
See everything under NAICS 54135
- Federal contract opportunities, awards and IDVs under this code
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