Servicing Maryland, Virginia, and the District since 1979.

Carlos Izquieta,

Director of Operations 

Carlos has over 35 years of experience in the industry and is certified in Green Cleaning, Floor Care, Cleaning Processes and Chemical Safety. His knowledge and expertise extends to all the staff at Capital Building Services.

About Us

The CBS Team

Capital Building Services, Inc. was founded in 1979 by former CEO Donald Nguyen. We are a certified minority owned company and have been servicing the Metropolitan Area for over 41 years. 


We are experienced in providing full service custodial and maintenance for commercial, construction, retail and medical buildings for the government, public, and private sectors.

We value every client relationship and strive to provide consistent quality service backed by our experienced and dedicated management team.

oVER 40 YEARS OF quality Custodial And BUIlding Maintenance

Christina Phan,

Director of Human Resources 

‚ÄčChristina is certified with Paycom and as a payroll specialist she is very knowedgeable with all the related rules and regulations.

Our Mission

‚ÄčExperience You Can Trust 

We guarantee an effective cleaning process and a knowledgeable management team that will preserve the condition of your buildings. Our reputation and history of success with our clients and their business needs speaks for itself. There is no substitution for the best.


Dedicated Management Team


The core of every successful business relies on the strength of their management team. Here at Capital, we train, incentivize, and treat our staff like family. As as result, they are equipped to better serve our clients fully.   


Your Needs First

Whether your facility is new or old, our Clean Slate Program will make your building look and feel like new again. We are committed to providing you with a seamless transition that is convenient with your schedule. We approach every client with a focus on integrity, advocacy, and understanding. 

William Nguyen,

CEO/ President

William has been in this industry since he was old enough to work. He quickly learned the business as his father's right hand man and helped to grow the company to where it is today.

Loan Nguyen, 

Director of Accounting

Loan has over 20 years of experience in AR, AP and Cost Proposals. Her attention to detail and accuracy is appreciated by all of our clients.