Darwin Chambers Co LLC

Darwin Chambers Co LLC, a St. Louis-based small business Subchapter S corporation, manufactures and installs specialized environmental control chambers and related laboratory equipment for federal research agencies as a pure prime contractor (100% of recent awards), competing predominantly under full-and-open and Total Small Business set-asides rather than 8(a) or HUBZone vehicles.

The company's capability footprint centers on thermoelectric and walk-in environmental chambers—plant growth chambers, insect rearing chambers, stability chambers, and climate-controlled test systems—engineered for pharmaceutical stability testing, biological research, materials durability assessment, and controlled-environment experimentation. Representative recent work includes a $229,768 NIST purchase order (September 2025) for environmental and curing chamber replacement at Building 226 in Gaithersburg, Maryland, supporting infrastructure materials research; a $386,371 Bureau of Reclamation retrofit contract (2021) for six large environmental chambers at the Concrete and Structural Laboratory in Denver, Colorado; a $132,780 NOAA purchase order (August 2024) for two 8-by-8-foot walk-in environmental chambers at the Lake Michigan Field Station in Muskegon, Michigan; and a $42,382 USDA Agricultural Research Service award (September 2025) for two IN034 insect rearing chambers to the Tropical Crop and Commodity Protection Research Unit in Hilo, Hawaii. Deliverables span equipment procurement, installation, calibration traceable to NIST standards, commissioning, operator training, and multi-year maintenance contracts.

Customer concentration reflects a diffuse federal R&D footprint across 41 agencies. The U.S. Army Corps of Engineers' Engineer Research and Development Center anchors the portfolio with 11 awards worth $499 thousand (14% of combined potential value), followed by the Department of the Interior's Bureau of Reclamation (1 award, $386 thousand), the National Institute of Standards and Technology (3 awards, $250 thousand), the Department of Veterans Affairs (1 award, $223 thousand), and the USDA Agricultural Research Service across multiple geographic Area offices (14 awards combined, $333 thousand). These five customer clusters represent 45% of combined potential value. The portfolio spans the National Institutes of Health, the National Oceanic and Atmospheric Administration, the Office of Naval Research, the U.S. Geological Survey, and the Environmental Protection Agency, indicating Darwin Chambers serves as an incumbent or preferred vendor across civilian R&D infrastructure.

Darwin Chambers does not sit on government-wide contract vehicles, GWACs, BPAs, or GSA Schedules; all awards in the source are direct purchase orders issued under simplified acquisition procedures (FAR Part 13) or firm fixed-price definitive contracts. The company maintains a multi-year maintenance contract with the Army Corps of Engineers' ERDC running through July 2028 (base year plus four option years, $86,659 option year 2 award in August 2023), indicating customer retention and recurring revenue potential. Four awards with combined potential value of $339 thousand reach ultimate completion within the next twenty-four months, representing recompete exposure concentrated at NIST and the Veterans Administration. Activity has remained modest and cyclical—four awards in 2022, five in 2023, two in 2024, four in 2025, and three in 2026—with combined potential value across all 79 awards totaling $3.5 million and 99% obligated. Darwin Chambers has been registered in SAM.gov since 2004 and competes exclusively under the full-and-open and Total Small Business set-aside categories; the company does not pursue 8(a), HUBZone, SDVOSB, or WOSB designations.

Manufacturer of environmental chambers, incubators, testing chambers, humidity and temperature chambers, humidified incubators, walk-in temperature/humidity rooms, stability testing chambers -- from bench top to floor standing