John C. Grimberg Company

What John C. Grimberg Company does

John C. Grimberg Company is a family-owned general and mechanical contractor established in 1951 and headquartered in Rockville, Maryland, with a satellite operations and procurement office in Manassas, Virginia. The firm provides integrated construction services — including design/build, design/bid/build, turnkey, IDIQ, and MACC delivery — for federal, state, local, and private sector clients across the Mid-Atlantic region. Its primary customer base is concentrated in U.S. federal agencies, with notable engagements at U.S. Army Corps of Engineers, NAVFAC (Washington and Mid-Atlantic), the Architect of the Capitol, FBI, DEA, GSA, NIH, NIST, NASA, the U.S. Naval Academy, and Walter Reed National Military Medical Center.

The company's core technology stack centers on LEED-certified sustainable construction and BIM (Building Information Modeling), supported by in-house LEED expertise, LEED-certified project managers, and an architecture/engineering staff. Service offerings span pre-construction management, mechanical and plumbing systems installation, LEED management, and full general contracting across facility types including healthcare, research/laboratory, military/defense, power plants, historic renovations, and administration facilities. The firm is recognized for executing the first Silver-rated LEED project in Virginia and has received more than two decades of consecutive AGC Washington Contractor Awards, including multiple BIM and sustainability honors.

Commercially, Grimberg operates a fee-for-service project-based revenue model, with pricing determined through competitive bidding on government solicitations and IDIQ/MACC task order awards. Go-to-market is enterprise field sales targeting federal, state, and local agencies in the Washington DC metropolitan area, with primary distribution through IDIQ/MACC contract vehicles held with NAVFAC, FBI, GSA, NIH, the National Gallery of Art, DC Air National Guard, and the Architect of the Capitol. Recent awards — including 2022 NAVFAC contracts valued at $13.1M and $12.5M, a USFWS MATOC covering CONUS and Hawaii, and a 2026 USACE Huntsville FRR D-B MATOC Phase 2 with OCONUS scope — indicate the firm is extending its geographic footprint beyond the Mid-Atlantic while deepening its federal agency penetration.

Name

John C. Grimberg Company

Legal name

John C. Grimberg Company, Inc.

Website

https://grimberg.com

Company type

Private

Founded year

1951

Operating status

Operating

Headcount range

101–250 employees

Short description

John C. Grimberg Company is a family-owned general and mechanical contractor, founded in 1951 and based in Rockville, Maryland, delivering LEED-certified design/build, BIM-enabled construction, and mechanical services primarily to U.S. federal agencies across the Mid-Atlantic region.

Ownership category

akta.pro rank

Product category

General Contracting Services

NAICS

Specialty Trade Contractors (238), Building Equipment Contractors (2382)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Construction - Special Trade Contractors (1700)

akta.pro primary industry

Commercial General Contracting (New Build) (IMAFAAAA)

akta.pro secondary industry

Self-Performing General Contractors (IMAFAAAI)

Keywords

• General contracting services
• Mechanical contracting
• LEED construction
• Design build services
• Government construction

Headquarters

HQ city

Rockville

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Technology or R&D

Revenue model

1. General Contracting Services: Fee-for-service construction contracting delivering design/build, design/bid/build, turnkey, and IDIQ/MACC contracts for federal, state, and private sector clients.
2. Mechanical and Plumbing Systems: Complete mechanical and plumbing contractor services as one of the largest mechanical contractors in the Washington, DC area.
3. Pre-construction Management: Services including estimating, value engineering, scheduling, constructability reviews, value and cost analyses, and permitting.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels1 record

Core offering

John C. Grimberg Co. is a family-owned general and mechanical contractor providing complete construction services — design/build, design/bid/build, turnkey delivery, IDIQ/MACC contract administration, pre-construction management, LEED-certified green construction, and mechanical and plumbing systems installation — to federal, state, and private clients throughout the Mid-Atlantic region.

Product overview

John C. Grimberg Co. is a family-owned general and mechanical contractor established in 1951, headquartered in Rockville, MD. The company offers a unified portfolio of construction services including Design/Build Delivery, Design/Bid/Build Delivery, IDIQ/MACC Contract Administration, Turnkey Delivery, LEED Management, Mechanical and Plumbing Systems, and Pre-construction Management. The company specializes in constructing and renovating diverse facility types including Administration, Medical and Healthcare, Research/Laboratory, Barracks and Housing, Power Plants, Historic Renovations, Water/Wastewater Treatment, Military Training, Command and Control/Headquarters, Airfield and Aircraft Hangar Facilities. The services work together as an integrated construction offering, enabling the company to serve federal, state, and private clients throughout the Mid-Atlantic region with complete project lifecycle support from pre-construction through delivery.

Differentiator

Problem solved

Functional benefit

Products and services

• Design/Build Delivery
• Design/Bid/Build Delivery
• IDIQ and MACC Contract Administration
• Turnkey Delivery
• LEED Management
• Mechanical and Plumbing Systems
• Pre-construction Management

Quantifiable outcome

• Completed first Silver-rated LEED project in Virginia (Langston Facility Replacement, Arlington, VA)
• +1 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Scale indicators3 records

Recent moves1 record

Expansion highlights4 records

Direct peers

• Manhattan Construction Company: Employee-owned national general contractor with strong federal, civic, and institutional portfolio. Comparable design/build delivery, federal contracting experience, and pursuit of complex renovation and new-build projects for agencies similar to Grimberg's customers.
• Balfour Beatty US: Large national general contractor with a significant federal, military housing, and institutional portfolio. Comparable in IDIQ/MACC pursuit strategy and in executing renovation, healthcare, and education projects for government clients.
• Clark Construction Group: Larger Bethesda-based general contractor with very similar federal and institutional client base in the DC metro area. Comparable in delivery methods (design/build, IDIQ) and in executing complex projects for agencies like NAVFAC, GSA, NIH, and the Architect of the Capitol.
• Hensel Phelps: Employee-owned design/build general contractor with a substantial federal, aviation, and institutional portfolio. Comparable in IDIQ/MACC pursuits for federal agencies and in self-performing mechanical and specialty work on complex government projects.
• Coakley & Williams Construction: Mid-Atlantic general contractor with deep federal and institutional client base in the DC metro area. Closely comparable in size, regional focus, design/build capability, and pursuit of NAVFAC, NIH, and federal tenant improvement work.
• The Walsh Group: Family-owned national general contractor (Walsh Construction and Archer Western) competing for federal, healthcare, and institutional work. Direct overlap with Grimberg in design/build federal projects and similar self-perform construction services.
• Gilbane Building Company: Large private general contractor with significant federal government and institutional portfolio. Comparable in delivery methods (design/build, CM-at-risk, IDIQ), self-perform capability, and pursuit of complex agency projects similar to Grimberg's NAVFAC and NIH work.
• Whiting-Turner Contracting Company: Mid-Atlantic-headquartered general contractor serving federal, healthcare, higher-education, and institutional clients. Directly comparable in project mix, self-perform MEP capability, and award-winning execution on large federal and institutional projects.
• Grunley Construction: Rockville, MD-based general contractor specializing in government, institutional, and historic renovation projects. Direct overlap in Mid-Atlantic federal market, including GSA, Architect of the Capitol, and Smithsonian work, with comparable size and self-perform capabilities.

Broad incumbents

• Skanska USA Civil & Building: Large national and global general contractor pursuing federal, healthcare, and institutional work. Wider geographic footprint and broader portfolio than Grimberg, but directly competes on IDIQ and design/build federal solicitations in the Mid-Atlantic.

Market position

Strengths2 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/john-c.-grimberg

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about John C. Grimberg Company