American Custom Contractors

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American Custom Contractors
100 SURVEYS
SINCE JUNE 2026
CERT 2942

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100
Verified Customers
Surveyed
Customer Loyalty
Customer Satisfaction
Helpful Expertise

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  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance

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American Custom Contractors
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American Custom Contractors
Roofing, Windows, Doors & Siding Contractor
|
District of Columbia  Fairfax  Montgomery  Prince George's Counties
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1 CONSECUTIVE YEAR

Diamond Certified Researched Articles on American Custom Contractors

researched article

A recent residential roofing project by American Custom Contractors

company logo

American Custom Contractors repairs, replaces, maintains, and inspects roofs for residential and commercial clients in Maryland, Eastern-West Virginia, Northern Virginia, D.C., and Southern Pennsylvania. In addition to working on all types of roofing systems (including asphalt, cedar, slate, metal, flat and Spanish tile), the family-owned company has the in-house capabilities to install siding, windows, gutters and other exterior home renovation products.

Co-owner William Giakoumatos says American Custom Contractors is driven by a passion for performing at a high level. “We love transforming properties and providing our clients with the best possible work at the best possible price. Ultimately, our favorite part of the job is seeing the smiles on their faces when we’re able to exceed their expectations.”

American Custom Contractors takes a detail-oriented approach to every aspect of its work, which Mr. Giakoumatos says is important for ensuring positive results. “Whether we’re navigating an insurance claim or handling a straightforward retail transaction, our clients know we’re going to execute at the highest level. They hold us to a higher standard because they trust that we’ll do the right thing.”

Diamond Certified Researched Capabilities on American Custom Contractors

Service Area

serving area
Serving Maryland
Eastern-West Virginia
Northern Virginia
D.C.
Southern Pennsylvania
Serving Maryland, Eastern-West Virginia, Northern Virginia, D.C. and Southern Pennsylvania

Main Services

Siding Contractor
  • Aluminum Siding
  • Board And Batten Siding
  • Cedar Siding
  • Fiber Cement Siding
  • Hardie Board Siding
  • House Siding
  • Metal Siding
  • Siding Installation
  • Siding Replacement
  • Stucco Siding
  • Vinyl Siding
  • Wood Siding
Roofing
  • Cedar Shake
  • Metal Shingles
  • Residential Roofing
  • Roof Coatings
  • Roof Inspection
  • Roof Leak Repair
  • Roof Repair
  • Roof Replacement
  • Roofing Installation
  • Steel Roofing
Windows
  • Replacement Windows
  • Velux Skylights
  • Window Installation
  • Window Replacement

Additional Services

Roofing Replacement, Repair & Maintenance
Siding
Windows & Doors
Gutters
Skylights
Complimentary Inspections

Company Info

Hours
Mon
08:00 am - 06:00 pm
Tue
08:00 am - 06:00 pm
Wed
08:00 am - 06:00 pm
Thu
08:00 am - 06:00 pm
Fri
08:00 am - 06:00 pm
Sat
09:00 am - 01:00 pm
Sun
Closed
Closed
Mon – Fri: 8am – 6pm
Sat: 9am – 1pm
Website
Contact
American Custom Contractors
15728 Crabbs Branch Way, Rockville, MD 20855

Capabilities Table

Company Name
American Custom Contractors
Phone Number
DCID Number
DCID3014171000
Managers
William Giakoumatos and Demetri Giakoumatos, Owners
Years in Industry
50+ (Combined)
# of Employees
43
License
MD License #279, VA License #2705088927A, DC License #68000436, WV License #057909, PA License #0811
Insurance
Liability Insurance,
Workers' Compensation
Founded
1972
Customer Type
Residential, Commercial
Payment Accepted
american express,
discover,
mastercard,
visa

Certifications & Awards

Brands

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Select Photos From American Custom Contractors

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Diamond Certified Expert Contributor Advice & Tips

William Giakoumatos is owner of American Custom Contractors, a Diamond Certified company. He can be reached at (301) 640-5454 or info@americancustomcontractors.com.

William Giakoumatos is owner of American Custom Contractors, a Diamond Certified company. He can be reached at (301) 640-5454 or info@americancustomcontractors.com.

William Giakoumatos: Born Builder

By Caitlyn Stair, Diamond Certified Research Reporter

William Giakoumatos was introduced to construction long before he was old enough to consider it a career. “My dad would take my brother and I to jobsites on Saturday mornings when we wanted to stay home and watch cartoons,” he details. “We were basically born and raised with hammers in our hands.”

William officially entered the construction industry in the mid-1990s, while his younger brother, Demetri, followed suit in 2002 after e...

Read Full Article - William Giakoumatos: Born Builder

American Custom Contractors Website and External Feeds

Website

FAQs
By American Custom Contractors

How long has American Custom Contractors been in business?

Where is ACC located and what areas do you serve?

Is ACC licensed, bonded and insured?

Do you work on commercial properties as well as residential?

What certifications does ACC hold?

Does ACC offer any discounts?

Is ACC involved in the local community?

What exterior services does ACC provide?

What roofing materials do you work with?

What siding options do you install?

Do you install skylights?

What gutter services do you offer?

Do you offer free roof inspections?

How do I get started with ACC?

Are estimates really free?

Who should be present for the estimate appointment?

How long is a written quote valid?

How long does a typical project take?

What does the project process look like from start to finish?

Do you handle permits?

What warranties does ACC offer?

Why does it matter that ACC holds elite manufacturer certifications?

What is the Diamond Certified Performance Guarantee?

Does ACC offer financing?

Is there any obligation to finance?

American Custom Contractors Ratings and Survey Responses (reviews)

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American Custom Contractors
100 SURVEYS
  • 4.8
  • star image
  • star image
  • star image
  • star image
  • star image
SINCE JUNE 2026
CERT 2942

Diamond Certified Ratings Dashboard

Customer Satisfaction

Customer Loyalty

Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance
American Custom Contractors

Based in Rockville, MD

4.8 avg. star score from 100 Verified Customer Phone Survey Responses

(Reviews: Scroll down to read them.)

Our surveys of only verified real customers produce the country’s most accurate ratings of local companies. American Custom Contractors scored Highest in Quality and Helpful Expertise and passed the credential-based checks to earn Diamond Certified.

A Star Equivalent Score is calculated for each verified customer rating by weighting the 1–10 Quality score, the YES/NO Loyalty (intent to return) score and the YES/NO Helpful Expertise score. If Helpful Expertise wasn’t surveyed or didn’t apply, it’s simply not shown.