Updated: Nov 20, 2025
Location
Address
690 Rt 25, Setauket, NY, 11733
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Carlstrom, John H Construction
Carlstrom, John H, 690 Rt, Setauket, NY (Employees: Carl O Ritter and John H Carlstrom) holds a Home Improvement Contractors license and 2 other licenses according to the Nassau County license board.
Their BuildZoom score of 0 does not rank in the top 50% of New York contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Carlstrom, John H, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Carlstrom, John H Services
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Carlstrom, John H Contact Information
Phone Number: (631) 544-4279
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Address: 690 Rt 25, Setauket, NY 11733
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Carlstrom, John H License info
Verified License
| License # | H2039300000 |
| Status | Active |
| County | Nassau County |
| Type | Home Improvement Contractors |
- BuildZoom verified this license was active as of November 2025.
Verify this license's status for Carlstrom, John H at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | H20393000 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office of Consumer Affairs, 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 Carlstrom, John H at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | H20393000 |
| Status | Inactive |
| County | Nassau County |
| Type | Home Improvement Contractors |
- According to the Nassau County Office of Consumer Affairs, 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 Carlstrom, John H at the Nassau County Office of Consumer Affairs.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
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- *No active license on file. If you are Carlstrom, John H, click “This is My Business” to update your information.
Carlstrom, John H Employees
CR
Carl O Ritter
V Pres
JC
John H Carlstrom
Pres