4 G Plumbing And Heating, Inc.

4 G Plumbing And Heating, Inc., a Missoula, Montana–based small business Subchapter S corporation, provides mechanical construction, plumbing repairs, and HVAC system renovations to the federal government exclusively as a prime contractor on 98% of its recent awards, operating entirely outside SCI-reportable service-contract vehicles. The company competes under total small business set-asides on all recurring work and holds no parent IDIQs, GWACs, or agency-wide vehicles; it operates solely under single-award Blanket Purchase Agreements with individual agencies.

4 G Plumbing And Heating is heavily concentrated at one customer: the National Institutes of Health Construction program (NIH Construction) accounts for 24 awards and $9.3 million of the $12.4 million combined potential value across the company's recent footprint—74% of all awards and 75% of all dollars. The company holds a $7 million single-award BPA with NIH Construction, effective September 25, 2022 through September 25, 2029, under which 22 task orders have been issued to date carrying $2.3 million in combined potential value. The remaining customer base is fragmented: the Department of Agriculture Forest Service (R1-Northern Region and Job Corps) placed 8 awards for $97 thousand, the General Services Administration Public Buildings Service placed 7 awards, and the Occupational Safety and Health Review Commission placed 4 awards. The top five customer agencies account for 83% of recent awards. The tension between award count and dollar concentration is minimal—NIH Construction dominates both metrics.

Representative work under the NIH Construction BPA includes mechanical repairs and renovations spanning air handler conversions (Building A AH-3, AH-6, and AH-A.1 fan wall conversions), laboratory vacuum system upgrades (Building 31), compressed air system renovations (Building 31), steam coil and humidification grid replacement (Building 13), heat recovery unit installation (Building 26 boiler plant), control valve and stainless steel panel installation, LN2 modifications (Building 13B), temporary chiller provision and removal, and building utilities and facilities operations support. Task orders range from $19,677 to $180,000 in ceiling value, with ultimate completion dates scattered from 2024 through 2029. The most recent awards include a $150,000 mechanical and plumbing emergency repairs task order (August 1, 2026), a $100,000 utilities and facilities operations task order (September 21, 2026), and earlier 2025 and 2024 task orders for cooling tower media fill replacement ($128,400), air handler renovation ($169,972), and building infrastructure modifications. All NIH Construction awards carry total small business set-aside designations.

Activity trajectory shows decline in recent years—the company received 10 awards in 2023, 6 in 2024, 3 in 2025, and 2 through mid-2026—but carries minimal near-term recompete exposure. Only one award ($150,000 potential value) has an ultimate completion date within the next twenty-four months; the majority of active task orders extend through September 2029 under the parent BPA, which itself completes on that date and constitutes the primary recompete event. The vendor operates almost entirely as a prime contractor; a single sub-award appears in the source data: a medical gas piping task under Copper Creek, LLC for an FHVA exam rooms project in 2024. No SCI reporting is generated from prime contracts, reflecting that the company's work falls below or outside SCI thresholds; the SCI dataset shows 13 records as a named subcontractor with only 5.5 FTEs in FY2025, confirming that sub work is minimal relative to prime activity. The company has maintained federal contracting relationships continuously since 1991 and remains localized to NIH Rocky Mountain Laboratories operations in Hamilton, Montana, with geographic scope limited to that single federal campus.