Top Interior plumbing, heating, and air-conditioning contractors contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $29.9M in net prime contract dollars under NAICS 238220, up 19.6% from $25.0M in the preceding 12 months. 312 prime contractors received positive obligations, and 75 of them accounted for 80% of that spend.
Prime contracts funded by the Department of the Interior. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top Interior contractors for NAICS 238220
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | g1 Construction, Inc. | $3.9M | $0 | 12.7% | New |
| 2 | DLJ Management Services, LLC | $2.0M | $0 | 6.7% | New |
| 3 | WRX Contracting, LLC | $895K | $0 | 2.9% | New |
| 4 | Axiom Builders Inc | $847K | $2.4M | 2.8% | ▼ 3 |
| 5 | Superior Structures LLC | $687K | $0 | 2.3% | New |
| 6 | Vedant Construction Inc | $649K | $0 | 2.1% | New |
| 7 | DAP Management Group, LLC | $622K | $0 | 2.0% | New |
| 8 | Massillon Construction and Supply LLC | $583K | $635K | 1.9% | ▼ 1 |
| 9 | Eleven Bravo Group, LLC | $542K | $74K | 1.8% | ▲ 54 |
| 10 | Hamilton Pacific Chamberlain LLC | $444K | $22K | 1.5% | ▲ 138 |
| 11 | HJ GOV Contracting Corp | $423K | $0 | 1.4% | New |
| 12 | Pacific Coast Contracting Group | $418K | $0 | 1.4% | New |
| 13 | Mooweep LLC | $401K | $43K | 1.3% | ▲ 88 |
| 14 | Xenturis LLC | $393K | $72K | 1.3% | ▲ 53 |
| 15 | Western Mechanical, Inc. | $389K | $0 | 1.3% | New |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- g1 Construction, Inc.$0 → $3.9M (+$3.9M) · now #1
- DLJ Management Services, LLC$0 → $2.0M (+$2.0M) · now #2
- WRX Contracting, LLC$0 → $895K (+$895K) · now #3
Largest declines
- Mckenzie Construction & Site Development LLC$1.6M → $9K (−$1.6M) · now #258
- Axiom Builders Inc$2.4M → $847K (−$1.5M) · now #4
- Takota Flats-SEG JV LLC$1000K → $0 (−$1000K) · no latest-period obligations
New to this market
152 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| g1 Construction, Inc. | Sep 3, 2026 | $3.9M |
| DLJ Management Services, LLC | Sep 1, 2026 | $2.0M |
| WRX Contracting, LLC | Sep 21, 2026 | $895K |
| Superior Structures LLC | Aug 24, 2026 | $687K |
| Vedant Construction Inc | Aug 21, 2026 | $649K |
| DAP Management Group, LLC | Mar 18, 2026 | $622K |
| HJ GOV Contracting Corp | Apr 17, 2026 | $423K |
| Pacific Coast Contracting Group | Mar 23, 2026 | $418K |
Where the money comes from
Funding sub-agencies within the Department of the Interior, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| National Park Service | $20.8M | $16.1M | Up $4.8M (29.7%) |
| Bureau of Indian Affairs and Bureau of Indian Education | $3.0M | $2.3M | Up $664K (28.7%) |
| U.S. Fish and Wildlife Service | $1.9M | $1.6M | Up $351K (22.2%) |
| Bureau of Land Management | $1.7M | $2.9M | Down $1.2M (41.6%) |
| U.S. Geological Survey | $1.4M | $1.3M | Up $183K (14.6%) |
| Bureau of Reclamation | $626K | $447K | Up $179K (40.2%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 140P4525C0029 | Mckenzie Construction & Site Development LLC 140P4525C0029: REHABILITATE MECHANICAL SYSTEM, STEAMTOWN NATIONAL HISTORIC SITE, SCRANTON, PA | $1.6M | Dec 31, 2026 |
| 140L0625C0012 | Axiom Builders Inc HVAC CONTROL SYSTEM, OR | $3.1M | Jul 6, 2027 |
| 140P8426C0001 | g1 Construction, Inc. REHABILITATE HVAC SYSTEM COMPONENTS AT PARK HEADQUARTERS (HQ) AND NORTH OPERATIONS CENTER (NOC), REDWOOD NATIONAL AND STATE PARKS, DEL NORTE COUNTY, CALIFORNIA. | $3.9M | Jul 31, 2027 |
| 140P6026C0011 | DLJ Management Services, LLC JEFF REPLACE COOLING TOWER AND BOILER | $2.0M | Nov 24, 2027 |
Common questions
Who are the top Interior contractors for NAICS 238220?
In the latest 12 months, g1 Construction, Inc. ($3.9M), DLJ Management Services, LLC ($2.0M), WRX Contracting, LLC ($895K) received the most Interior obligations for plumbing, heating, and air-conditioning contractors.
How concentrated is this market?
The eight largest primes held 33.4% of positive obligations, and g1 Construction, Inc. alone held 12.7%. 152 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 238220 contracts ending soon?
4 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P4525C0029 (Mckenzie Construction & Site Development LLC, $1.6M obligated), ending Dec 31, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 238220 across all agencies
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$338.1MDoD · NAICS 238220
$330.6MUSDA · NAICS 238220
$81.5MDOJ · NAICS 238220
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$30.2MState Department · NAICS 238220
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$21.7MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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