What NAICS 541330 Covers
NAICS 541330 is the code federal agencies use to buy engineering services that are not construction. It covers structural, mechanical, civil, electrical, environmental, geotechnical, and systems engineering — the planning, analysis, design, and inspection work that precedes and supports physical infrastructure.
What it does not cover: actual construction (that falls under the 200000s), architectural services (541310), or computer systems design (541512). If your firm does both engineering and construction, you may compete under either code depending on what the contract primarily requires.
Under this code, agencies buy things like:
- Bridge and roadway design packages for the Federal Highway Administration
- Facility condition assessments and design at military installations
- Environmental engineering and remediation design for the Army Corps
- Airfield pavement design and evaluation for Air Force bases
- Structural assessment of federal buildings after seismic events
- Water and wastewater system design for Bureau of Reclamation projects
The work tends to be study-and-design rather than build-and-operate, though many task orders include construction administration and construction management services billed under the same NAICS.
Federal Spend Under This Code
Federal agencies obligated roughly $15–18 billion annually under 541330 in fiscal years 2022–2024, based on USASpending.gov data. The figure fluctuates with defense supplemental spending and infrastructure bill allocations.
The Infrastructure Investment and Jobs Act (IIJA), signed in November 2021, injected an estimated $550 billion into physical infrastructure over five years. A significant portion funds engineering design services — planning, permitting, environmental review — before a shovel hits the ground. Demand under 541330 has been elevated since FY2022 and is expected to remain so through at least FY2027 as IIJA projects reach execution.
Defense spending drives the largest single share. Department of Defense obligations under this code consistently represent 40–50% of total federal awards. Army Corps of Engineers, Naval Facilities Engineering Systems Command (NAVFAC), and Air Force Civil Engineer Center (AFCEC) each run multi-billion dollar engineering programs annually.
Civilian agencies add significant volume: Department of Transportation (FHA, FAA), Department of Energy, Environmental Protection Agency, and Department of Veterans Affairs all use 541330 regularly.
SBA Size Standard
The SBA size standard for 541330 is $25.5 million in average annual receipts over the prior three fiscal years. This was updated in 2022 from the earlier $16.5 million threshold.
Some sub-specialties within engineering services carry different standards when the work is classified under related NAICS codes (for example, certain oil and gas engineering falls under different codes entirely). Verify the exact NAICS listed in each solicitation — agencies sometimes use 541330 broadly or split work across 541380 (Testing Laboratories) or 541620 (Environmental Consulting).
If your firm is near the $25.5M threshold, monitor your three-year rolling average carefully. Crossing it mid-contract does not disqualify you from existing awards, but it affects eligibility for future set-aside competitions.
Which Set-Asides Appear Most Frequently
8(a) small business set-asides are common in engineering services, particularly for design-build task orders at military installations. Army Corps districts award significant 8(a) task orders under their IDIQ vehicles. If your firm is 8(a) certified, direct awards (sole-source) are available up to $4.5 million for services — and that ceiling matters because many engineering task orders land in the $1M–$4M range.
HUBZone set-asides appear regularly in states with large rural or economically distressed areas adjacent to federal facilities. If your office is HUBZone-certified and located near a military base or tribal land, look specifically at Army Corps and Navy task orders in those regions.
SDVOSB set-asides at the Department of Veterans Affairs are significant. VA runs major capital improvement programs and medical facility upgrades. Veteran-owned engineering firms with the right technical capabilities compete well here.
WOSB set-asides under 541330 are active. Engineering Services is not an underrepresented industry for WOSB purposes — it qualifies for both WOSB and EDWOSB set-asides. The SBA's WOSB program historically flagged industries where women-owned firms were underrepresented, and engineering has remained on that list.
DBE (Disadvantaged Business Enterprise) is not a federal prime contracting set-aside in the SBA sense, but it matters enormously on transportation infrastructure. Federal Highway Administration and FAA require DBE participation goals on federally-funded state and local projects. If you pursue state DOT or airport authority prime contracts with federal funding, DBE certification from your state's UCP (Unified Certification Program) opens subcontracting and teaming opportunities on nearly every project.
Key Contract Vehicles
Most engineering services contracts flow through IDIQ (Indefinite Delivery/Indefinite Quantity) vehicles. Getting on the right IDIQ is often more important than chasing individual solicitations.
Army Corps of Engineers IDIQ contracts: Corps districts each maintain their own A-E (Architect-Engineer) IDIQ pools for their geographic area. These are typically 5-year IDIQs with task orders competed among pool members. Application is via SF 330 (Standard Form for A-E Services). New IDIQ pools open periodically — watch beta.SAM.gov for Synopsis notices under 541330 from USACE districts.
NAVFAC A-E IDIQs: Similar structure. NAVFAC regions (Atlantic, Pacific, Mid-Atlantic, etc.) each maintain design pools. Some are unrestricted; others are small business set-asides.
AFCEC (Air Force Civil Engineer Center): Runs large multiple-award IDIQs for facility design and environmental work. Recent vehicles include the Architect-Engineer IDIQ for Air Force Installations Worldwide.
GSA Multiple Award Schedule (MAS): Schedule SIN 541330ENG covers engineering services. Having a GSA Schedule contract does not guarantee work, but it gives federal agencies a simplified acquisition path for orders under $25K (and simplified competition above that). It also signals credibility to prime contractors looking for qualified subs.
Seaport-NxG: Navy's primary vehicle for engineering, financial, and program management services. Covers 23 functional areas including engineering. Open seasons occur periodically; check Navy NAVSEA's website for the schedule.
OASIS+: GSA's multi-agency vehicle for professional services including engineering. It replaced the original OASIS contract. OASIS+ has small-business pools including 8(a), HUBZone, WOSB, and SDVOSB tracks. The next on-ramp opening is worth monitoring if your firm missed the initial awards.
Certifications That Create Competitive Edge
For this NAICS code, these certifications carry the most practical weight:
8(a) Business Development Program: The single highest-leverage certification for engineering services if you qualify. Direct award authority and set-aside competitions inside established IDIQ pools give 8(a) firms consistent pipeline. Apply to SBA early — the process takes 90 days at minimum, often longer.
HUBZone: Useful if your primary office is in a qualified area. HUBZone gives a 10% price evaluation preference on full-and-open competitions and qualifies you for set-aside pools. Geographic fit matters more here than for other certifications.
SDVOSB / VOSB: Essential for VA work. Self-certification is now verified through VA's Veteran Small Business Certification (VetCert) program, not just the old self-reporting system. Complete the VetCert application before pursuing VA solicitations.
WOSB / EDWOSB: Needed to compete in WOSB set-aside pools. EDWOSB (Economically Disadvantaged) opens additional sole-source authority. Certify through SBA directly or an approved third-party certifier.
Professional Licenses: While not a federal certification in the SBA sense, licensed Professional Engineers (PEs) are often required by solicitation. Make sure key personnel PEs are listed in your SF 330 and that at least one PE holds licensure in the state(s) where work will be performed. Many federal agencies require the prime or sub to carry PE licensure — verify in each solicitation's Section L qualifications criteria.
Finding Active Solicitations
beta.SAM.gov is the primary source. Set up a saved search with: - NAICS: 541330 - Set-aside type: your applicable codes (SBA, 8A, HZC, SBP, etc.) - Agency: start with USACE, NAVFAC, AFCEC, DOT, VA
Beta.SAM.gov sends email alerts when new notices match your saved search. Use this rather than manual searches.
Agency forecast websites: Most large agencies publish annual procurement forecasts. Army Corps districts publish their A-E IDIQ procurement plans. NAVFAC publishes a similar forecast. These show upcoming IDIQ openings 6–18 months out — far enough ahead to form teams before the solicitation drops.
FedBizOpps (now integrated into beta.SAM.gov): Historical data. USASpending.gov shows past awards by NAICS, agency, and set-aside type. Pull the last 3 years of 541330 awards filtered to your target agency — it shows what vehicles they used, typical award size, and who won. That research guides your teaming strategy.
PTAC (Procurement Technical Assistance Centers): Free matching and counseling for small businesses pursuing federal work. PTACs can alert you to local opportunities and help you read solicitations correctly. Find your nearest PTAC at aptac.org.
What a First Contract Realistically Looks Like
Most engineering firms win their first federal prime contract as a task order under an IDIQ, not through an open-market solicitation. The path usually looks like this:
First, get onto a vehicle. SF 330 submissions for Army Corps or NAVFAC A-E IDIQs are your target. These require a qualifications package: past performance on similar work (government or private sector counts), key personnel with relevant PEs, and a geographic alignment to the district's footprint. A small firm can submit a credible SF 330 with 3–5 years of relevant private-sector work if the project descriptions match what the Corps buys.
Second, team before you submit. Most IDIQs have teaming requirements or at minimum benefit from having subs with complementary specialties listed. Find a prime or large sub relationship before the first IDIQ competition — it strengthens your qualifications package and gives you a network for task order competition.
Third, understand the task order cadence. Once on an IDIQ pool, agencies send Requests for Task Order Proposals (RTOPs) to pool members. These are competed among pool members only, which cuts the competition from hundreds of firms to 5–15. First task orders are often in the $300K–$1.5M range. The goal in year one is to perform well and build documented past performance under federal contract numbers — that past performance is currency for the next IDIQ competition and the next task order.
Timeline: From starting your SF 330 to first task order award is typically 12–18 months. The IDIQ evaluation takes 3–6 months. Then task orders may not appear immediately. Plan for 18 months of investment before revenue flows.
The firms that win consistently in this space maintain three things: current federal PE licenses in their target regions, documented past performance with federal contract numbers, and relationships with agency program offices built through industry days and small business outreach events. None of those happen quickly, but all are within reach for a firm starting from zero.
