Updated: May 10, 2026
Location
Address
1803 Slaughter Station Rd, Hartly, DE, 19953
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Mark L. Letterman HVAC/Mechanical Contractor
Mark L. Letterman, 1803 Slaughter Station Rd, Hartly, DE holds a Hvacr license and 1 other license according to the Delaware license board.
Their BuildZoom score of 0 does not rank in the top 50% of Delaware contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Mark L. Letterman, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Mark L. Letterman Contact Information
Address: 1803 Slaughter Station Rd, Hartly, DE 19953
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License # HM-0000114
Newark, DE
111
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Mark L. Letterman License info
Verified License
| License # | HM-0000019 |
| Status | Active |
| State | Delaware |
| Type | Hvacr |
| Business Type | Individual |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Mark L. Letterman at the State of Delaware.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 2015100816 |
| Status | Inactive |
| State | New Castle County |
| Type | Resident Contractor |
| Business Type | Individual |
- According to the State of Delaware Department of Finance: Division of Revenue, 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 Mark L. Letterman at the State of Delaware Department of Finance: Division of Revenue.
This is a sample of licensing data; click here to access a complete history.
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Mark L. Letterman Employees
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Mark L. Letterman
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