NAICS Code 541330: Engineering Services for Government Contracts

What Is NAICS Code 541330?

NAICS code 541330 — Engineering Services covers establishments primarily engaged in applying physical laws and principles of engineering in the design, development, and utilization of machines, materials, instruments, structures, processes, and systems. This includes civil, mechanical, electrical, environmental, and industrial engineering firms that provide design, consulting, and project management services.

If your business provides engineering design, analysis, or consulting — whether that's structural engineering for buildings, environmental remediation design, or mechanical systems engineering — this is likely your primary NAICS code for federal contracting.

What Services Fall Under 541330?

The Census Bureau defines 541330 to include:

• Civil engineering consulting and design services
• Mechanical engineering services
• Electrical and electronic engineering services
• Environmental engineering consulting
• Industrial and manufacturing engineering services
• Structural engineering services
• Acoustical engineering consulting
• Traffic and transportation engineering consulting
• Marine engineering and naval architecture services
• Mining and geological engineering services

The key distinction is that 541330 covers engineering design and consulting services — if you're applying engineering principles to solve technical problems and produce designs, specifications, or analyses, this is your code. If you perform the actual construction based on those designs, that falls under construction NAICS codes (236xxx series). If you provide architectural services alongside engineering, that's 541310 (Architectural Services) or 541330 depending on the primary service.

541330 SBA Size Standard

The Small Business Administration (SBA) size standard for NAICS 541330 is $47 million in average annual receipts. This means your company qualifies as a "small business" for government contracting purposes if your average annual revenue over the past 3-5 years is below $47 million.

This is one of the higher revenue thresholds in the professional services category. Many mid-sized engineering firms with 100-300 employees still qualify as small businesses for set-aside contracts under this code, making it a competitive but accessible market for growing engineering companies.

Note that some engineering contracts may use an exception size standard. For example, contracts related to military and aerospace engineering sometimes fall under different NAICS codes with different thresholds. Always check the specific solicitation for the applicable size standard.

Set-Aside Programs for 541330

If your company qualifies as small under the 541330 size standard, you're eligible for several set-aside programs that limit competition to small businesses:

• Small Business Set-Aside — Open to all qualifying small businesses
• 8(a) Business Development Program — For socially and economically disadvantaged businesses
• HUBZone — For businesses in Historically Underutilized Business Zones
• SDVOSB — Service-Disabled Veteran-Owned Small Business
• WOSB / EDWOSB — Women-Owned Small Business / Economically Disadvantaged WOSB

Engineering services are heavily procured by the Department of Defense, Army Corps of Engineers, Department of Energy, EPA, and NASA. Many of these agencies have aggressive small business contracting goals, making set-aside contracts under 541330 a significant opportunity for qualifying firms.

How Many 541330 Contracts Are Posted on SAM.gov?

NAICS 541330 is one of the most active codes on SAM.gov for professional services. On any given day, there are typically 30-100 active solicitations under this code. These range from small task orders under $100,000 to large indefinite-delivery/ indefinite-quantity (IDIQ) contracts worth hundreds of millions.

Common contract types under 541330 include:

• Environmental remediation design and engineering
• Facility condition assessments and structural analysis
• Civil engineering for military construction (MILCON) projects
• HVAC and mechanical systems engineering for federal buildings
• Transportation and infrastructure engineering studies
• Energy efficiency audits and engineering solutions
• Water and wastewater system engineering

Major Contract Vehicles for 541330

Several government-wide and agency-specific contract vehicles frequently use NAICS 541330. Being on one of these vehicles can give you access to task orders without competing on the open market for each individual project:

• MATOC / SATOC — Multiple Award / Single Award Task Order Contracts, commonly used by Army Corps of Engineers and NAVFAC
• GSA Schedule (MAS) — Multiple Award Schedule under the Professional Services category
• Agency-specific IDIQs — DOE, EPA, and DoD agencies regularly issue IDIQ contracts for engineering services

Related NAICS Codes

If you work in engineering services, you should also consider registering under these related NAICS codes in SAM.gov to maximize your opportunity matching:

• 541310 — Architectural Services (if you offer A/E services)
• 541340 — Drafting Services (CAD, technical drawing)
• 541350 — Building Inspection Services
• 541360 — Geophysical Surveying and Mapping Services
• 541620 — Environmental Consulting Services (if environmental is a focus)
• 541990 — All Other Professional, Scientific, and Technical Services

How to Find 541330 Contract Opportunities

The primary source for federal contract opportunities is SAM.gov. You can search for active solicitations by filtering on NAICS code 541330. However, manually searching SAM.gov daily is time-consuming and easy to miss opportunities.

GovConToday monitors SAM.gov overnight and matches contract opportunities to your NAICS codes — including 541330. Instead of spending 30 minutes each morning searching SAM.gov, you get a curated list of relevant solicitations on your dashboard.