About American Custom Contractors — Family-Owned Exterior Contractor Since 1972
Unparalleled - Our Story
I’m proud to share a little bit about who we are and where we come from. American Custom Contractors was started back in 1972 by our parents, Alex and Angie Giakoumatos. At the time, they were living in Gaithersburg, Montgomery County, raising a small family and chasing the dream of building something meaningful. What began as a modest carpentry business slowly grew into a full-service remodeling company, fueled by their hard work, commitment to quality, and genuine care for the people they served.
Alongside the business, our family also grew. Our parents raised four children, and all of us have, in one way or another, stayed connected to this community that gave us so much. In 1997, my brother Demetri and I, officially joined the family business. Stepping into the company felt natural—it was less about taking over and more about carrying forward a legacy that was already deeply rooted in service and craftsmanship. With fresh energy and a shared vision, we worked to expand our reach and offerings, and it was during this time that our Commercial Services division was born.
As the company continued to grow, so did the need for a central hub where we could manage projects more efficiently and connect with customers more easily. In 2005, we moved into our current location at 15728 Crabbs Branch Way in Rockville. This move wasn’t just about convenience—it was about positioning ourselves where we could best serve our clients, respond quickly to estimates, and stay connected to the neighborhoods we’ve always valued.
Community has always been at the heart of American Custom Contractors. It’s more than where we work—it’s where we live, raise our families, and build relationships that last for decades. That’s why we’re proud members of the Rockville Chamber of Commerce and why we encourage you to come get to know us and discover more about us. When you choose to work with us, you’re not just hiring a contractor; you’re partnering with a family that’s been committed to craftsmanship and community for over 50 years.
-William Giakoumatos, President
Our Mission
When my parents, Alex and Angie, first started American Custom Contractors, they built the business on a foundation of honesty, integrity, and a simple promise—to get the job done right the first time. Those values weren’t just words to them; they were the guiding principles behind every project, big or small.
Now, more than 50 years later, I’m proud to say we still live by that same mission. Our work has expanded far beyond its early beginnings, and today we serve homeowners, businesses, and insurance restoration projects across Maryland, Virginia, West Virginia, Pennsylvania, and Washington, DC. Even as the industry has evolved, our commitment to craftsmanship and integrity has never wavered.
For us, success isn’t measured in numbers alone—it’s measured in the satisfaction of our clients and the trust they place in us when they recommend our team to their friends and family. Every project is an opportunity to carry forward the legacy that my parents started, and we approach each one with the determination to exceed expectations.
We’ve become one of the most trusted names in home improvement in the region because we never lose sight of what matters most: delivering quality work with care, precision, and respect for the people we serve. That’s our mission, and it will always be at the heart of who we are.
-Demetri Giakoumatos, CEO
We are Licensed, Bonded and Insured in:
MD License #279 | VA License #2705088927A | DC License #68000436
WV License #057909 | PA License #081101
William Giakoumatos, President
William has spent more than 25 years helping homeowners protect and improve their homes through quality exterior remodeling. He oversees production operations, craftsmanship standards, and installation quality to be sure every project meets the standards we have set since his parents started the company in 1972.
Areas of Expertise:
- Roofing, Siding, Windows, Gutters
- Specialty roofing systems, including natural slate, cedar, copper, synthetic slate, and synthetic cedar
- Exterior design, material selection, and curb appeal improvements
- Storm damage restoration and insurance claims
- Installation best practices and quality assurance
- Customer experience and service improvement
Demetri Giakoumatos, CEO
Demetri has spent more than 20 years leading the growth and direction of American Custom Contractors. As CEO he focuses on strategy and vision, while building a company culture that fosters employee growth and customer satisfaction. He works closely with every department to ensure homeowners receive a consistent, transparent experience from start to finish.
Areas of Expertise:
- Roofing, Siding, Windows, Gutters
- Sales training, mentoring, and performance coaching
- Technology, innovation, and process automation
- Business operations and organizational leadership
- Strategic growth and innovation
- Professional development
What Does It Mean to Be Part of The Diamond Certified Resource?
The Diamond Certified symbol represents the foundation of everything we do at American Custom Contractors. Like two perfectly balanced forces, it reflects the partnership between a customer seeking the highest quality and a company fully committed to delivering on its promises. Diamond Certified is earned only by companies that consistently score highest in quality and helpful expertise through ongoing customer satisfaction research — a standard rooted in thousands of years of the diamond’s legacy as the ultimate symbol of excellence. Our team takes pride in every project, bringing passion and professionalism to each job, backed by the Diamond Certified Performance Guarantee so you can trust that every transaction is held to the highest standard. Ultimately, your satisfaction is the true measure of our success, and this recognition reflects our unwavering commitment to earning it.