Southcoast Welding & Manufacturing, Llc.

Southcoast Welding & Manufacturing, LLC, a for-profit limited liability company headquartered in Chula Vista, California, delivers structural steel and aluminum fabrication, welding, machining, and comprehensive ship maintenance and repair services to the U.S. Navy as a prime contractor (72% of recent awards) and subcontractor on defense shipbuilding programs. The vendor competes predominantly full-and-open; it holds multiple total small business set-aside IDIQs alongside unrestricted prime vehicles, reflecting a mixed posture that leans toward small business set-asides on amphibious and Norfolk-homeported surface combatant work but pursues full-and-open competition on larger San Diego LCS and surface fleet sustainment contracts.

Southcoast's customer concentration is extreme: Naval Sea Systems Command (NAVSEA) funds 480 of 564 total awards (85% by count) and anchors $5.93 billion of the $6.04 billion combined potential value across the vendor's portfolio. The top five customers by potential value are NAVSEA ($5.93 billion), National Oceanic and Atmospheric Administration ($73.8 million), Military Sealift Command ($29.4 million), GSA Federal Acquisition Service ($4.3 million), and U.S. Coast Guard ($362 thousand). NAVSEA dominance reflects Southcoast's strategic positioning on four major NAVSEA IDIQs: the $1.68 billion Littoral Combat Ships Class Sustainment Execution Contract–West Coast Part III (14 task orders, $6.7 million potential value); the $1.14 billion CNO Availabilities for Fast Attack Submarines OPW Lot 2 non-critical systems engineering contract (awarded September 2, 2025, through September 1, 2033); the $300.2 million Complex and Non-Complex Maintenance on Surface Combatant and Amphibious Class Ships–Norfolk total small business set-aside (amphibious and cruiser/destroyer work homeported in Norfolk); and the $177.1 million Complex and Non-Complex Maintenance on Surface Combatant and Amphibious Class Ships–Norfolk non-complex maintenance IDIQ (also a total small business set-aside). Southcoast also holds a $73.8 million total small business set-aside IDIQ with NOAA (Fleetwide Dockside and Ship Maintenance, through August 2028) for dockside repair services on NOAA research vessels.

The vendor's heaviest transactional volume flows through the Complex and Non-Complex Maintenance on Surface Combatant and Amphibious Class Ships–San Diego IDIQ, which generated 192 task orders against $205.4 million in combined potential value. Representative delivery order awards include a $7.92 million firm fixed-price order for USS Ashland (LSD-48) FY24 Total Ship Readiness Assessment maintenance work (January 8, 2024); a $6.22 million order for USS Pearl Harbor (LSD-52) FY25 Continuous Maintenance Availability (January 13, 2025); a $4.95 million definitive contract for ARCO (ARDM-5) Service Craft Overhaul (May 15, 2025); and a $3.82 million delivery order for USS Boxer (LHD-4) FY25 amphibious maintenance (December 2, 2024). Task orders span planned maintenance, continuous maintenance availability, emergent repairs, and facility maintenance on Littoral Combat Ships, guided-missile destroyers, cruisers, and amphibious transport dock ships homeported in San Diego and Norfolk. Work is performed in San Diego, California, with place of performance at Southcoast's primary operational facility on Mission Bay.

Activity trajectory shows strong growth: awards jumped from 58 in 2022 to 124 in 2025, with 16 recorded in 2026 year-to-date. However, only two awards with ultimate completion within the next twenty-four months carry material recompete exposure ($215 thousand combined potential value), suggesting most active delivery orders extend beyond the June 2026 horizon. The vendor's prime-to-sub ratio (72% / 28%) indicates it operates primarily as a prime contractor, though subcontract teaming appears substantial: Southcoast subcontracts to major primes including Huntington Ingalls Incorporated (DDG 51 class ship construction, long lead-time material for LPD-28 and LHA-9, structural steel and welding work); HII Fleet Support Group LLC (C4ISR and network systems structural, HVAC, and piping installations on USS Carl Vinson CVN-70, USS Kidd DDG-100, and other carriers in San Diego and Seattle); BAE Systems Maritime Solutions San Diego and Norfolk (USS Essex LHD-2 docking selected restricted availability direct material, USS Paul Hamilton DDG-60 SRA, USS Fitzgerald DDG-62 delivery orders); Serco Inc. (USS Stout DDG-55 installation services, C4ISR hardware installations on multiple carriers in San Diego); Marinette Marine Corporation (FFG(X) guided missile frigate manhole covers and rings); and General Dynamics Mission Systems (Littoral Combat Ship Independence class in-service engineering and life cycle support). SCI data are sparse—ten records covering FY2022–FY2024 with zero invoiced revenue reported on prime contracts—reflecting that ship maintenance delivery orders often exceed the $150,000 SCI threshold but are classified as goods or products rather than reportable services, or carry classified scope precluding SCI inclusion.

Southcoast Welding & Manufacturing has served the U.S. Navy since 2004. Its capability footprint centers on ship fabrication, welding, machining, and maintenance across destroyer, cruiser, amphibious assault, and littoral combat vessel classes. The vendor's established role as a critical supplier to NAVSEA fleet sustainment, combined with its positioning on four multi-billion-dollar IDIQ vehicles and a mixed small-business-set-aside and full-and-open competitive posture, positions it as a strategic provider for Navy maintenance and modernization operations at San Diego and Norfolk homeports.