Top DOT plumbing, heating, and air-conditioning contractors contractors
In the 12 months ending Oct 5, 2026, the Department of Transportation obligated $21.7M in net prime contract dollars under NAICS 238220, down 21.5% from $27.6M in the preceding 12 months. 58 prime contractors received positive obligations, and 13 of them accounted for 80% of that spend.
Prime contracts funded by the Department of Transportation. 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 DOT 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 | Sergents Mechanical Systems Inc | $6.1M | $4.2M | 27.8% | — |
| 2 | M. E. Tafoya Enterprises, Inc. | $2.0M | $284K | 9.3% | ▲ 14 |
| 3 | Cornerstone Construction Services, LLC | $1.7M | $7K | 7.6% | ▲ 62 |
| 4 | KEO & Associates Inc | $1.2M | $0 | 5.5% | New |
| 5 | WAM Industries, Incorporated | $1.0M | $0 | 4.8% | New |
| 6 | Core Sustainability, LLC | $959K | $0 | 4.4% | New |
| 7 | Ground Level Services LLC | $857K | $0 | 3.9% | New |
| 8 | Prow'ess Construction Corp. | $832K | $223K | 3.8% | ▲ 13 |
| 9 | TJ&B Air Conditioning and Electric, LLC | $767K | $3.8M | 3.5% | ▼ 6 |
| 10 | IBS L.L.C | $745K | $84K | 3.4% | ▲ 22 |
| 11 | Tripact, LLC | $603K | $0 | 2.8% | New |
| 12 | Lawdensky Construction Company Incorporated | $520K | $0 | 2.4% | New |
| 13 | The Blackledge Group, Inc. | $512K | $0 | 2.4% | New |
| 14 | Corsentino Construction, Inc. | $480K | $0 | 2.2% | New |
| 15 | MD Mckenzie LLC | $392K | $0 | 1.8% | New |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- J. Wayne Poole, Inc−$2.4M → $0 (+$2.4M) · no latest-period obligations
- Sergents Mechanical Systems Inc$4.2M → $6.1M (+$1.9M) · now #1
- M. E. Tafoya Enterprises, Inc.$284K → $2.0M (+$1.7M) · now #2
Largest declines
- Mckenzie Construction & Site Development LLC$3.8M → $236K (−$3.6M) · now #18
- Guardian Construction, Inc.$3.8M → $177K (−$3.6M) · now #22
- TJ&B Air Conditioning and Electric, LLC$3.8M → $767K (−$3.1M) · now #9
New to this market
23 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| WAM Industries, Incorporated | Aug 19, 2026 | $1.0M |
| Core Sustainability, LLC | Sep 18, 2026 | $959K |
| Tripact, LLC | Sep 22, 2026 | $603K |
| The Blackledge Group, Inc. | Jul 15, 2026 | $512K |
| Corsentino Construction, Inc. | Jun 16, 2026 | $480K |
| MD Mckenzie LLC | Aug 21, 2026 | $392K |
| Make Ready Construction Services, LLC | Feb 2, 2026 | $300K |
| Johnson Controls Building Solutions, LLC | Jun 15, 2026 | $181K |
Where the money comes from
Funding sub-agencies within the Department of Transportation, 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 |
|---|---|---|---|
| Federal Aviation Administration | $21.2M | $27.0M | Down $5.8M (21.6%) |
| Federal Railroad Administration | $480K | $0 | New |
| Maritime Administration | $31K | $348K | Down $316K (91.0%) |
| Federal Highway Administration | $25K | $153K | Down $129K (83.9%) |
| Saint Lawrence Seaway Development Corporation | $11K | $23K | Down $12K (52.7%) |
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 |
|---|---|---|---|
| 697DCK25C00267 | Guardian Construction, Inc. REPLACE HVAC AT SBN ATCT, SOUTH BEND INTERNATIONAL AIRPORT, SOUTH BEND, IN | $3.3M | Jan 7, 2027 |
| 697DCK26C00035 | Cornerstone Construction Services, LLC PUMP REPLACEMENT AT THE NEW YORK TRACON, WESTBURY, NY | $1.6M | Jan 14, 2027 |
| 697DCK25C00240 | TJ&B Air Conditioning and Electric, LLC REMOVE AND REPLACE MODULAR CHILLERS UNITS, REPAIR STORE FRONT DOORS, BREAK ROOM AND FACILITY ENTRANCE AT RSW TRACON AND ATCT FORT MYERS FL. | $2.5M | Mar 19, 2027 |
| 697DCK26C00215 | Sergents Mechanical Systems Inc ZAB ARTCC CHILLER 100, 200, 300, AND 400 DEMO AND REPLACEMENT. | $5.8M | Apr 4, 2027 |
| 697DCK25C00274 | Mckenzie Construction & Site Development LLC ORF HVAC REPLACEMENT SERVICES | $4.1M | Apr 22, 2027 |
Common questions
Who are the top DOT contractors for NAICS 238220?
In the latest 12 months, Sergents Mechanical Systems Inc ($6.1M), M. E. Tafoya Enterprises, Inc. ($2.0M), Cornerstone Construction Services, LLC ($1.7M) received the most DOT obligations for plumbing, heating, and air-conditioning contractors.
How concentrated is this market?
The eight largest primes held 67.1% of positive obligations, and Sergents Mechanical Systems Inc alone held 27.8%. 23 contractors won their first obligations in this market during the latest 12 months.
Are any large DOT NAICS 238220 contracts ending soon?
5 of the largest awards in this market reach their current end date in the next 18 months. The first is 697DCK25C00267 (Guardian Construction, Inc., $3.3M obligated), ending Jan 7, 2027. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$22.4MFigures 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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