Addon Services LLC

Alexandria, VA

UEI
CZUVDNASMGP5
CAGE
8AU65
Primary NAICS
236220 Commercial and Institutional Building Construction
SAM.gov registration
Active through

Company facts

SBA certifications
Women-Owned Small Business
· Current
Economically Disadvantaged Women-Owned Small Business
· Current
Self-certified in SAM.gov
  • For Profit Organization
  • Limited Liability Company
  • Subcontinent Asian (Asian-Indian) American Owned
  • Woman Owned Business
  • Woman Owned Small Business
  • Minority Owned Business
  • Self Certified Small Disadvantaged Business
Entity structure
Corporate Entity (Not Tax Exempt)
Other NAICS codes in SAM.gov
Show all 172
SAM.gov registration date
Physical address
1800 Diagonal Rd #600, Alexandria, VA 22314, USA
Founded
2012
Employees
11-50
Estimated annual revenue
$1M-$10M
Industry
  1. Industrials
  2. Capital Goods
  3. Construction & Engineering
SIC code
87 Engineering & Management Services
Profiles

Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .

Contract obligations by fiscal year

Fiscal year Obligated
FY2027 To date $0
FY2026 $4,925,834
FY2025 $4,084,203
FY2024 $19,385,800
FY2023 $8,366,670

Top agencies by obligations

Rank Agency Obligated, FY2026–FY2027 Share
1 Department of Health and Human Services $4,553,894
2 Department of the Army $314,485
3 Washington Headquarters Service $57,454

Contract vehicles

Expired vehicles (2)

Contract awards

Award Agency Obligated Awarded
C115324 - RTP electrical underground distribution repair. Install new MV cable 75N99026F00001 NIH Construction $4,414,710
Design-build construction services to repair north parking structure at the mark center HQ003425FE568 Washington Headquarters Service $3,750,000
Design-bid-build construction to repair retaining wall HQ003424F0672 Washington Headquarters Service $9,491,535
Design-build construction for upgrade of north rotary road fern vehicle access control point fence HQ003424F0596 Washington Headquarters Service $3,042,425
C115956 - HVAC, electrical and architectural renovations to self service store [24-004628] 75N99024F00002 NIH Construction $712,822

Latest 5 listed here. See the rest on GovTribe.

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Vendor Location Primary NAICS
Knuckles-Williams Contracting, Inc. UEI JHRWDW21JMF7 Brookeville, MD 236220 Commercial and Institutional Building Construction
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2A LLC UEI GZ67CL86SJR6 Aberdeen, MD 236220 Commercial and Institutional Building Construction
Blue Construction Services LLC UEI N3MYJ5PNYYM7 Leesburg, VA 236220 Commercial and Institutional Building Construction
Sustainable Facilities Management Services, LLC UEI LJXED3JJ8161 Washington, DC 561210 Facilities Support Services

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About the company

Written by GovTribe AI ·

Addon Services LLC, a women-owned and economically disadvantaged women-owned small business (EDWOSB) based in Alexandria, Virginia, delivers design-build and design-bid-build construction, facility renovation, and infrastructure modernization services to the federal government as a prime contractor across three indefinite delivery contracts spanning Department of Defense, Department of the Navy, and National Institutes of Health customers. The company competes predominantly under 8(a) Competitive, 8(a) Sole Source, woman-owned small business, and total small business set-asides; recent awards show 100% of the company's federal work as prime contractor.

Addon Services' capability portfolio centers on construction and facility repair at federal research campuses and military installations. Representative work includes a $4.414 million electrical underground distribution repair and medium-voltage cable installation at NIH's Research Triangle Park campus in Durham, North Carolina (awarded August 2026 under the NIH 8(a) Construction Services at Research Triangle Park 2023-2028 IDIQ); a $9.497 million design-bid-build retaining wall repair at the Pentagon Reservation (awarded September 2024 under the Total Maximum Daily Load and Paving Contract); and a $2.422 million roof refurbishment project for Building 101 E Module at NIEHS Research Triangle Park (awarded July 2023 under the same NIH vehicle). The company also delivered HVAC and electrical renovations to an NIH self-service store ($712,822), air handling unit replacements ($1.465 million), and fire sprinkler system enhancements ($933,841), all at Research Triangle Park. At the Pentagon, Addon Services has executed multiple concurrent design-build and design-bid-build orders for security fencing upgrades and parking structure repairs, ranging from $3.04 million to $3.75 million per task order.

Customer concentration divides evenly between the Department of Health and Human Services (National Institutes of Health Construction, 6 awards at $62.3 million combined potential value) and the Department of Defense (Washington Headquarters Service, 6 awards at $64.5 million combined potential value), accounting for 94% of recent award count. The Department of the Navy's Naval Facilities Engineering Command anchors the majority of potential dollars: a single $450 million multiple-award indefinite delivery contract for the Hampton Roads Area of Virginia MACC (awarded April 2024, total small business set-aside, covering general construction projects in the Hampton Roads region through April 2029) represents 77% of Addon Services' combined contract potential value across all awards. The National Oceanic and Atmospheric Administration and the Department of the Army complete the customer roster with sub-million-dollar work.

Addon Services holds three parent indefinite delivery vehicles. The NIH 8(a) Construction Services at Research Triangle Park 2023-2028 contract ($49.999 billion ceiling, competitive 8(a) multiple-award, ultimate completion March 2028) has generated six task orders totaling $14.7 million in combined potential value for HVAC, electrical, structural, and fire safety work at the Research Triangle Park campus. The Total Maximum Daily Load and Paving Contract ($45 million ceiling, woman-owned small business set-aside multiple-award, ultimate completion September 2027) has yielded five task orders totaling $19.5 million for civil construction, parking structure repair, retaining wall work, and security fencing upgrades across the Pentagon Reservation and Mark Center in Alexandria. The Hampton Roads Area of Virginia MACC ($450 million ceiling, total small business set-aside, April 2029 ultimate completion) carries one $5,000 minimum-guarantee delivery order establishing ordering capacity for future task orders.

Activity growth peaked in 2024 with seven awards, contrasting with three awards in 2022 and five in 2023; awards per year declined to one each in 2025 and 2026 in the source snapshot. Four awards (combined potential value $11.2 million) face ultimate completion within the next twenty-four months, presenting recompete risk for Addon Services and opportunity for competitors. Service Contract Inventory data shows sparse SCI-reportable activity: $1.4 million in invoiced federal service-contract revenue in FY2024 across 1.6 FTEs, with zero SCI-reportable invoicing in FY2023 and FY2025. The median government-paid hourly rate across SCI prime records runs $36.48 per hour, with outlier rates reaching $1,775.14 per hour reflecting specialized or project-management labor. Across SCI-reportable prime contracts, Addon Services self-performed all reported hours with zero subcontractor engagement, indicating in-house delivery rather than sub-reliant execution on these service contracts.

SBA capabilities narrative

From the vendor's SBA profile

Addon Services LLC is successfully executing IDIQ and JOC federal contracts within military bases. The projects include historic building renovation construction. Design Build construction encompassing a comprehensive list of Definable Features of Work including Mechanical, Electrical, Plumbing (MEP), HVAC, Piping, Ductwork, Roofing, Paving, Architectural, Infrastructure. Our customers were impressed with Addon's successful completion of projects that they awarded us several contracts in the field of IT, Tech Pubs, Engineering & Professional support services.We are a distributer of UVSheltron UVC and Pure Air decontamination/disinfection products, PPE, masks, lab testing, medical and non-medical equipment sterilization, sanitization, bacteria/virus eradication.

Quick answers

Is Addon Services LLC registered in SAM.gov?

Yes. Addon Services LLC's SAM.gov registration is active through September 11, 2027.

Which SBA certifications does Addon Services LLC hold?

Addon Services LLC holds Women-Owned Small Business and Economically Disadvantaged Women-Owned Small Business certifications from the SBA.

Which contract vehicles does Addon Services LLC hold?

Addon Services LLC holds a place on 3 federal contract vehicles, including NIH 8(a) Construction Services at Research Triangle Park 2023 - 2028.

How much has Addon Services LLC received in federal contracts?

Federal contracts obligated $4,084,203 to Addon Services LLC in fiscal year 2025 and $36,762,507 in fiscal years 2023 through 2027.

How does Addon Services LLC rank among federal contractors?

Addon Services LLC ranked #2 in PSC Z2LZ, #34 in NAICS 62419 and #34 in PSC Z1HB in FY2025.

What is Addon Services LLC's most recent federal award?

Addon Services LLC's most recent federal contract award is C115324 - RTP electrical underground distribution repair. Install new MV cable (75N99026F00001), from NIH Construction, on August 6, 2026.

On GovTribe

See Addon Services LLC's full federal record

  • Federal contract awards
  • IDV awards
  • Contract vehicles
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