Top Interior architectural services contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $20.4M in net prime contract dollars under NAICS 541310, down 57.2% from $47.7M in the preceding 12 months. 29 prime contractors received positive obligations, and 10 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 541310
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 | Gwwo, Inc. | $3.4M | $3.9M | 16.1% | ▲ 3 |
| 2 | DHM Design Corporation | $3.0M | $4.7M | 14.1% | ▲ 1 |
| 3 | Anderson Hallas Architects, PC | $2.8M | $7.8M | 13.3% | ▼ 2 |
| 4 | HDR Engineering Inc | $1.4M | $1.5M | 6.5% | ▲ 6 |
| 5 | AECOM Services, LLC | $1.3M | $1.2M | 6.3% | ▲ 9 |
| 6 | Rolluda Architects, LLC | $1.2M | $574K | 5.7% | ▲ 14 |
| 7 | Strata Architecture Inc. | $1.1M | $2.8M | 5.0% | ▼ 2 |
| 8 | Quinn Evans Architects Inc | $1.0M | $6.2M | 4.8% | ▼ 6 |
| 9 | Ayers/Saint/Gross, Incorporated | $924K | $0 | 4.3% | New |
| 10 | Vitetta Group Incorporated | $921K | $183K | 4.3% | ▲ 18 |
| 11 | Architects Hawaii Ltd | $785K | $1.7M | 3.7% | ▼ 3 |
| 12 | Houser Walker Architecture, LLC | $719K | $2.0M | 3.4% | ▼ 6 |
| 13 | Croft and Associates, Inc. | $539K | $1.7M | 2.5% | ▼ 6 |
| 14 | Liollio Architecture PC | $390K | $1.3M | 1.8% | ▼ 2 |
| 15 | The Schemmer Associates Inc. | $358K | $706K | 1.7% | ▲ 4 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Ayers/Saint/Gross, Incorporated$0 → $924K (+$924K) · now #9
- Vitetta Group Incorporated$183K → $921K (+$737K) · now #10
- Rolluda Architects, LLC$574K → $1.2M (+$633K) · now #6
Largest declines
- Quinn Evans Architects Inc$6.2M → $1.0M (−$5.2M) · now #8
- Anderson Hallas Architects, PC$7.8M → $2.8M (−$5.0M) · now #3
- Strata Architecture Inc.$2.8M → $1.1M (−$1.7M) · now #7
New to this market
2 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Summer Consultants, Inc. | Jun 30, 2026 | $73K |
| Richter Associates Architects Inc | Dec 12, 2025 | $63K |
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 | $19.5M | $42.5M | Down $23.0M (54.2%) |
| U.S. Geological Survey | $864K | $2.6M | Down $1.7M (66.7%) |
| Departmental Offices | $73K | −$54K | Up $127K (235.0%) |
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 |
|---|---|---|---|
| 140P2025F0024 | Gwwo, Inc. NERI 326119 AE DESIGN SERVICES DD-CD REMOVE EXCESS STRUCTURES AND ABANDONED BUILDINGS PARKWIDE AND ADDRESS UTILITY NEEDS, WEST VIRGINIA | $3.4M | Nov 20, 2026 |
| 140P8525F0106 | Anderson Hallas Architects, PC TITLE II DESIGN DEVELOPMENT AND FINAL CONSTRUCTION DOCUMENTS SERVICES, REPLACE HVAC SYSTEMS IN THE YOSEMITE VALLEY MUSEUM AND EXPLORATION CENTER, YOSEMITE NATIONAL PARK, CALIFORNIA | $1.2M | Dec 30, 2026 |
| 140P2025F0007 | Quinn Evans Architects Inc MACA 258442 - ARCHITECTURAL & ENGINEERING DESIGN SERVICES FOR PREDESIGN (PD) AND SCHEMATIC DESIGN (SD) DOCUMENTS, REPAIR AND REPLACE COMMUNICATIONS UTILITY INFRASTRUCTURE PHASE I… | $1.9M | Jan 11, 2027 |
| 140P2024F0063 | Wiss Janney Elstner Associates Inc LYJO 290111 TITLE III SERVICES | $1.2M | Jan 31, 2027 |
| 140P2025F0317 | DHM Design Corporation CUVA 324044 DEMOLISH EXCESS STRUCTURES PDSD AND SUPPLEMENTAL SERVICES | $1.9M | Feb 26, 2027 |
| 140G0321C0003 | Architects Hawaii Ltd ARCHITECTURAL AND ENGINEERING SERVICES - DESIGN PHASE, REPLACE USGS FACILITIES IN HAWAII | $3.8M | Feb 28, 2027 |
| 140P2025F0251 | Anderson Hallas Architects, PC OLYM 340147 - "CONSTRUCT VISITOR CENTER AT HURRICANE RIDGE." | $1.6M | Jun 30, 2027 |
| 140G0322C0007 | Flad Affiliated Design Partnership ARCHITECTURAL AND ENGINEERING SERVICES, PHASED MODERNIZATION OF USGS NATIONAL WILDLIFE HEALTH CENTER IN MADISON, WI | $10.8M | Sep 30, 2027 |
| 140P2026F0130 | DHM Design Corporation GRCA 352837 - NORTH RIM DESIGN SERVICES, AT GRAND CANYON NATIONAL PARK, ARIZONA; ARCHITECTURAL AND ENGINEERING (A-E) SERVICES PLANNING SERVICES TASK ORDER | $2.9M | Sep 30, 2027 |
| 140P2024F0040 | Quinn Evans Architects Inc CAHA TITLE III REPAIR CAPE HATTERAS LIGHTHOUSE (CAHA 213068), RESTORE OR RECONSTRUCT HISTORIC FIRST ORDER FRESNEL LENS IN CAPE HATTERAS LIGHTHOUSE (CAHA 319350), IMPROVE AND… | $1.8M | Dec 31, 2027 |
Common questions
Who are the top Interior contractors for NAICS 541310?
In the latest 12 months, Gwwo, Inc. ($3.4M), DHM Design Corporation ($3.0M), Anderson Hallas Architects, PC ($2.8M) received the most Interior obligations for architectural services.
How concentrated is this market?
The eight largest primes held 71.9% of positive obligations, and Gwwo, Inc. alone held 16.1%. 2 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 541310 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P2025F0024 (Gwwo, Inc., $3.4M obligated), ending Nov 20, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 541310 across all agencies
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$111.3MState Department · NAICS 541310
$67.8MDOJ · NAICS 541310
$54.9MVA · NAICS 541310
$42.9MHHS · NAICS 541310
$29.2MUSAID · NAICS 541310
$20.4MDHS · NAICS 541310
$19.7MFigures 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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