Updated: Jun 12, 2026
Location
Address
1720 Broadway, Denison, IA, 51442
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Granzen Plumbing and Heating
Granzen Plumbing and Heating, 1720 Broadway, Denison, IA (Owned by: John C Granzen) holds a Contractor license and 3 other licenses according to the Iowa license board.
Their BuildZoom score of 0 does not rank in the top 50% of Iowa contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Granzen Plumbing and Heating, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Granzen Plumbing and Heating Contact Information
Phone Number: (712) 263-5244
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Address: 1720 Broadway, Denison, IA 51442
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Granzen Plumbing and Heating Reviews
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Verified License
BuildZoom confirmed this contractor's license
Granzen Plumbing and Heating License info
Verified License
| License # | C131782 |
| Status | Active |
| State | Iowa |
| Type | Contractor |
| Business Type | Sole Proprietorship |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Granzen Plumbing and Heating at the Iowa Workforce Development Agency.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| Status | Active |
| State | Iowa |
| Type | Plumbing, Mechanical |
| Business Type | Sole Proprietorship |
- When BuildZoom last verified this license, it had an expiration date of June, 2023. Check the current license status of Granzen Plumbing and Heating with the Iowa Department of Public Health
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | 50366-CL |
| Status | Active |
| State | Iowa |
| Type | Plumbing And Mechanical |
| Business Type | Sole Proprietorship |
- When BuildZoom last verified this license, it had an expiration date of June, 2023. Check the current license status of Granzen Plumbing and Heating with the Iowa Department of Public Health
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | C093477 |
| Status | Inactive |
| State | Iowa |
| Type | Contractor |
| Business Type | Sole Proprietorship |
- According to the Iowa Workforce Development 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 Granzen Plumbing and Heating at the Iowa Workforce Development Agency.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
- How the BuildZoom Score works
- *No active license on file. If you are Granzen Plumbing and Heating, click “This is My Business” to update your information.
Bonded
| Bond Value | $1 |
Granzen Plumbing and Heating Employees
JG
John C Granzen
Owner
JS
John C Granzen Sr
Owner
JG
John Granzen
Owner