G & M Services, LLC – Commercial, 
Institutional, Public

G & M Services is a Union Shop, offering comprehensive concrete cutting, drilling, and firestop installation services to clients throughout Washington, D.C., Maryland, Pennsylvania, and Virginia. We emphasize safety in all we do while focusing on building long-term relationships with our clients devising unique solutions performing quality work at a fair price.

G.H. Nitzel, Inc. – Commercial, Nitzel No Back

G.H. Nitzel is a full-service Mechanical Contractor.

GCS Security Services, LLCGCS Security
Residential, Commercial, Institutional, Public

GCS Security Services is a certified Minority Business Enterprise (MBE) full service risk mitigation firm providing a variety of end to end security and risk advisory services to a broad range of customers in the private and public sectors, licensed in Maryland, Virgina and Washington DC.

Genco Masonry, Inc. – Commercial, Institutional

Since 1929, Genco Masonry has been a leader in masonry construction in the MD, DC and VA areas. Our longevity is based on the company’s commitment to quality and safety.  We serve the commercial, multi-family, educational and institutional markets as well as performing historic masonry and concrete restorations and renovations.

Georgetown Insurance Service, Inc. – 
Bonding, Insurance

Delivering customized insurance solutions with exceptional service since 1977. We are headquartered in Silver Spring, MD with offices in Frederick, MD and Fairfax, VA. We service over 5,000 clients with over 25 licensed agents. 95% of our business is comprised of repeat customers because of the personal relationships we build.

Geo-Technology Associates, Inc. – Residential,Geo Technology Logo Commercial, Public

Geo-Technology Associates, Inc. is a professional engineering firm providing quality services that create opportunities for our clients through land and property enhancement.

Gettle, Inc. – Commercial, Institutional, PublicGettle

Gettle provides electrical, automation, fire, security and data communication services. Being one of the largest and most experienced design-build specialty contractors with offices in Central Pennsylvania and Northern Maryland. We work with businesses of all sizes spanning industries including commercial, industrial, healthcare, retail, service, manufacturing, mining, power generation and others.

Green Contracting Company, Inc. – Commercial, Green ContractingInstitutional, Public

Green Contracting is a premier heavy mechanical contractor serving the Mid-Atlantic region. Our other services include industrial construction, boiler repair, retubing and erection, rigging and equipment setting, chiller plant installation, process piping and structural steel erection. We can provide Construction Management – Design/Build construction for multi-million-dollar projects.

Green Job Works –

Gross, Mendelsohn & Associates, P.A.Gross-Mendelsohn-Baltimore-CPA-Accountant-Logo
Accounting – Residential, Commercial, Institutional

Gross, Mendelsohn & Associates is a Baltimore based CPA and consulting firm serving privately-held businesses, nonprofits and families in the Mid-Atlantic region. Our construction industry specialists guide construction contractors, architects and engineers through good and bad economies, always focusing on improving the bottom line.