Location and Projects
Ralph Donald Mellinger HVAC/Mechanical Contractor
Ralph Donald Mellinger, Cockeysville, MD (Employee: Ralph D. Mellinger) holds a Heating, Ventilation, Air Conditioning And Refrigeration license and 3 other licenses according to the Maryland license board.
Their BuildZoom score of 91 ranks in the top 37% of 58,058 Maryland licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Ralph Donald Mellinger, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Ralph Donald Mellinger Contact Information
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Building Permits by Ralph Donald Mellinger
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Ralph Donald Mellinger License info
Verified License
| License # | 2572 |
| Status | Active |
| State | Maryland |
| Type | Heating, Ventilation, Air Conditioning And Refrigeration |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Ralph Donald Mellinger at the Maryland Department of Labor, Licensing & Regulation.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | HM-0000661 |
| Status | Active |
| State | Delaware |
| Type | Hvacr |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Ralph Donald Mellinger at the State of Delaware.
This is a sample of licensing data; click here to access a complete history.
Verified License
| Status | Active |
| City | Annapolis |
| Type | Mech Cont, Master |
- BuildZoom has not verified this license since August, 2015.
Verify this license's status for Ralph Donald Mellinger at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-479 |
| Status | Inactive |
| City | Annapolis |
| Type | Mech Cont |
- According to the The City of Annapolis, MD, 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 Ralph Donald Mellinger at the The City of Annapolis, MD.
This is a sample of licensing data; click here to access a complete history.