Demetri Giakoumatos

CEO

For more than 20 years, Demetri Giakoumatos has focused on building one of the region’s most customer-focused exterior remodeling companies. As Chief Executive Officer of American Custom Contractors, he leads the company’s long-term growth strategy, vision, sales & professional development, and technology innovation.

Demetri works closely with every department to ensure homeowners receive a consistent, transparent experience from their first phone call through project completion and long-term warranty support. His leadership emphasizes continuous improvement, professional development, and creating systems that allow every customer to receive the same high level of service.

In addition to leading the company, Demetri is actively involved in coaching and mentoring the sales organization, helping consultants improve their communication, product knowledge, and ability to educate homeowners so they can make confident decisions.

Areas of Expertise

Demetri regularly provides leadership and guidance in:

Professional Experience

Throughout his career, Demetri has helped shape the systems and processes that support thousands of successful exterior remodeling projects.

His responsibilities include:

Leadership & Innovation

Demetri believes that exceptional craftsmanship must be supported by exceptional systems.

He continually evaluates new technologies, customer communication tools, and operational processes that improve the homeowner experience, including:

Industry Involvement

Demetri believes the best companies never stop improving.

Manufacturer Education Programs

Leadership Development & Executive Education

Technology and Innovation Conferences

Community Involvement

As a second-generation leader of American Custom Contractors, Demetri believes successful businesses have a responsibility to invest in the communities they serve.

He supports initiatives that strengthen local neighborhoods while encouraging a culture of service, integrity, and accountability throughout the company.  Demetri has organized company support for Central World Kitchen and through the St. George Greek Orthodox Church charitable initiatives.

What my Customers Say

Alix Rodowa

Rockville, MD •
Trim •
Google
Updated Dec 18: We opted to have new gutters, downspouts, and fascia board added to the outside of our house. The crew was incredibly fast and efficient and the work was completed in a single day. The project manager, Frank, was responsive over email and text and we finished the walk through of work the next day (today). Via email I was also sent pictures of the work (before, during, and after) which was a nice touch. For a fairly small change it made a very big impact on the way our house looks. We are very pleased with the quality of work! Updated on Dec 9: After hearing about the interaction described below, one of the owners reached out. Demetri really went above and beyond to hear us out and understand our concerns. We opted for a “do-over” quote and are considering our options. Demetri and ACC clearly take pride in their work and their brand and I really appreciated the follow up. Edited first review: Ultimately, our first interaction with ACC came down to an unfortunate miscommunication that left a bad impression. Please note, this is just related to the quote and doesn’t reflect any work from ACC. The front office staff communicated to the field staff that we wanted a roof quote rather than a roof certification. I did attempt to reiterate that we needed a certification at the start of the field visit, but the field tech, Manoa, verbally gave us a quote for a whole new roof replacement. We were looking to add solar and have a 15 year old roof. We knew it wasn’t new but wanted an unbiased opinion as to weather or not solar was possible. Ultimately, the solar went on with no problem, but the interaction with ACC didn’t factor in the way I had hoped.

Chris B

Potomac, MD •
Roofing •
Yelp
Another review mentioned that you cannot spell contractor without “con”. While in a spelling contest that may be accurate, I think that in reality American Custom Contractors breaks the trend. I recognize that everyone has their own experience, but mine was completely different in a positive way! Taking longer than estimated to do a good job is not called a “con” it’s called “patience”. About a year ago I had American Custom Contractors along with others come to my house for estimates on a new roof. Having a corporate sales background I carefully did my best to weed through the quotes of desperation (those guys who always come in cheaper) and those who I simply lacked confidence in. After careful consideration I chose them for a variety of reasons: I felt comfortable with the explanations given, the price was reasonable, their reputation was strong, and the referrals from previous customers were solid. Needless to say I was not disappointed. I will admit that everything didn’t go as planned, but most importantly, it was all resolved to my liking in an efficient and timely manner. In fact, one of the owners (Demetri) came to my house after the completion of the job to make sure I was satisfied. I’m confident that I received quality products and a company that will back them for years to come at a reasonable price. Being a year later, my roof looks great and I am still confident in my decision. Two other families I know have used them and have had positive experiences as well. In fact, I plan on calling them again soon to get an estimate on windows and some trim that needs to be replaced.

Eric U

Maryland •
Roofing •
Yelp
A good friend referred me to American Custom Contractors. We thought we had some roof issues and they came out to evaluate things. After more than 45 minutes checking out our roof, we were told that “all is well” and we do not have any roof issues. So wonderful to deal with an honest and ethical contractor. If and when we have challenges in the future, I will always call Demetri Giakoumatos. Appreciate you doing what is right.

Rafi I

Dayton, MD •
Roofing •
Yelp
Late last summer, we noticed a lot of signs for American Custom Contractors (ACC) going up in our neighborhood. When we asked about it, we found out that nearly every house in our neighborhood experienced extensive roof damage due to a hail storm that occurred while we were on vacation. We couldn’t tell that from looking at our roof, so we contacted our insurance company regarding their assessment of storm damage and the contractors doing roof replacements. They acknowledged that the storm had caused significant damage in our area and that they had a good relationship with resolving claim issues with American Custom Contractors. Based on the positive feedback from our neighbors and our insurance company, we met with Demetri, the CEO of ACC. He personally assessed the damage at our house and outlined the claim process and met with the insurance adjuster whose assessment matched exceptionally close with his own: we needed to have our roof, siding and gutters replaced – nearly all covered by our insurance. Demetri took considerable time to explain what would be done and offered us some excellent advice about the selection of roofing and siding materials. We asked for several additional things be done at our expense (e.g., removing leaky skylights) and these were nicely folded into his very detailed statement of work. It all came off without a hitch …. Well with the exception of a few bad weather delays. The roof replacement was a large job, but efficiently well done within two consecutive days. Cleanup was very thorough – not an easy task in itself. We are indebted to Gabriel who led the roofing crew. Next followed siding replacement scheduled for 5 days, but an early winter weather pattern forced this into a two-week span – even so, the crew had to work a few days in below-freezing weather. Their craftsmanship was so excellent that we put in additional work orders (reasonably priced!) to replace the ceiling for our wrap-around front porch as well as some additional trim work. We got to know this crew fairly well and would certainly recommend this team led by Michael Ko to anyone. The gutter replacement followed the siding work and this crew was also excellent and readily accepted a last minute change order for larger 6″ gutters. What really made all of this work so well for us was the onsite field management by Steve who also facilitated the last minute change orders, and the timely communications with Suzanne who also ordered materials, scheduled the crews, and followed up with us on nearly every aspect of the project. We were really impressed with how well she juggled all of this and kept us up-to-date. In summary…this was a great team effort and we could not have been more pleased. We also learned a lot from the craftsmen and as a result came to not only appreciate their craft but respect their work ethic as well. Great job by and thanks to everyone at American Customer Contractors.

Connect with Demetri

To learn more about American Custom Contractors or request an estimate, visit our Contact Us page.  You can also connect with Demetri on LinkedIn.

Editorial Role

Demetri reviews educational content that relates to the homeowner experience, sales process, and overall remodeling journey to ensure information is clear, accurate, and easy for homeowners to understand.

Content may be reviewed for:

  • Homeowner buying guides
  • Exterior remodeling planning resources
  • Roofing and siding project expectations
  • Insurance restoration process education
  • Financing and project planning
  • Customer experience resources
  • Home improvement decision guides

Articles reviewed by Demetri display a “Reviewed by Demosthenis Giakoumatos” attribution and are periodically updated to reflect current best practices, technology, and homeowner expectations.

 

Recent Articles Reviewed