Updated: Jun 20, 2026
Location and Projects
Address
9689 GERWIG LANE 4E, Columbia, MD, 21046
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Onesource Window Systems LLC
Onesource Window Systems LLC, 9689 Gerwig Ln E, Columbia, MD (Owned by: Onesource Window Systems Llc) holds a Gen Contr Construction Mngr license and 4 other licenses according to the District of Columbia license board.
Their BuildZoom score of 95 ranks in the top 22% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Onesource Window Systems LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Onesource Window Systems LLC Contact Information
Phone Number: (240) 755-0435
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Address: 9689 GERWIG LANE 4E, Columbia, MD 21046
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Building Permits by Onesource Window Systems LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
Single family dwelling construct 12 x 18 open deck adjacent to existing deck**subject to field inspection**
Valuation:
N/A
Permit #:
B25002557
Status:
complete
Fee:
$55
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Onesource Window Systems LLC License info
License Not Verified
| License # | 410521000047 |
| Status | Active |
| City | District Of Columbia |
| Type | Gen Contr Construction Mngr |
- When BuildZoom last verified this license, it had an expiration date of September, 2024. Check the current license status of Onesource Window Systems LLC with the Department of Consumer and Regulatory Affairs
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 106847 |
| Status | Active |
| State | Maryland |
| Type | Home Improvement |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Onesource Window Systems LLC at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 131028 |
| Status | Active |
| State | Maryland |
| Type | Contractor (Corppart) Home Improvement |
- When BuildZoom last verified this license, it had an expiration date of August, 2015. Check the current license status of Onesource Window Systems LLC with the Maryland Department of Labor, Licensing & Regulation
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-58665-3 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
- According to the United States Environmental Protection Agency, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Onesource Window Systems LLC at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | NAT-58665-2 |
| Status | Inactive |
| Nation | Environmental Protection Agency |
| Type | Renovation |
- According to the United States Environmental Protection Agency, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Onesource Window Systems LLC at the United States Environmental Protection Agency.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
Onesource Window Systems LLC Employees
OL
Onesource Window Systems Llc
Owner
WM
William Marciniak