Down Under Construction LLC
Sterling, VA
- UEI
- MQZGLGMBZ4H9
- CAGE
- 1YD24
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- SAM.gov registration date
- Physical address
- 105 Executive Dr # 100, Sterling, VA 20166, USA
- Website
- hylan.com
- Founded
- 1960
- Employees
- 251-1K
- Estimated annual revenue
- $50M-$100M
- Industry
-
- Industrials
- Capital Goods
- Construction & Engineering
- SIC code
- 87 Engineering & Management Services
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract subawards
| Prime contractor | Prime award | Amount | Awarded |
|---|---|---|---|
| M.c. Dean, Inc. | N6523624F0747 | $99,692 | |
| M.c. Dean, Inc. | N6523623F0776 | $126,298 | |
| M.c. Dean, Inc. | N6523623F0776 | $74,740 |
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About the company
Down Under Construction LLC, a for-profit limited liability company based in Sterling, Virginia, operates exclusively as a subcontractor to primes on federal infrastructure and facilities work, with no prime awards in its recent footprint. The vendor has earned three sub-awards between December 2024 and March 2026, all from a single Department of Navy customer, totaling $301 thousand in obligated dollars.
Down Under Construction subcontracts to M.c. Dean, Inc. on infrastructure modernization and upgrade projects for the Naval Information Warfare Systems Command (NIWC). The three sub-awards span a narrow capability set centered on in-ground infrastructure support and physical plant installation: a December 2024 sub task providing in-ground infrastructure support for the recorded NCR ESS upgrade to enable M.c. Dean design submissions to NIWC; a September 2025 infrastructure upgrade sub-award for removal, reinstallation, and base-structure improvement work on reader pedestals and bollards at four locations; and a March 2026 sub-award for CCTV intrusion-detection system upgrades involving conduit installation under modification 51063117. All three sub-awards flow through Indefinite Delivery Contract N6523620D8001, which the source lists as the parent vehicle for three task orders.
Activity has held flat at one award per year — 2024, 2025, and 2026 each carrying a single sub-award. The vendor's federal presence remains nascent: confined to a single customer (Navy Information Warfare Systems Command at 100% of awards), operating entirely as a subcontractor beneath M.c. Dean, with $301 thousand in recorded obligations. Down Under Construction carries secondary NAICS classification in both Engineering Services and Other Building Finishing Contractors, consistent with its infrastructure and facilities-support posture. No set-aside designations appear in the source.
Quick answers
Is Down Under Construction LLC registered in SAM.gov?
Yes. Down Under Construction LLC's SAM.gov registration is active through March 26, 2027.
On GovTribe
See Down Under Construction LLC's full federal record
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
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