Location and Projects
John Kostrowski Jr Plumbing and Heating
John Kostrowski Jr Plumbing and Heating, 445 Hill St, Boonton, NJ holds a Plumber license and 1 other license according to the New Jersey license board.
Their BuildZoom score of 90 indicates that they are licensed or registered but we do not have additional information about them.
Their license was verified as active when we last checked. If you are thinking of hiring John Kostrowski Jr Plumbing and Heating, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
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Building Permits by John Kostrowski Jr Plumbing and Heating
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John Kostrowski Jr Plumbing and Heating License info
Verified License
| License # | 36BI00782000 |
| Status | Active |
| State | New Jersey |
| Type | Plumber |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for John Kostrowski Jr Plumbing and Heating at the New Jersey Department of Law & Public Safety.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 13VH00057900 |
| Status | Inactive |
| State | New Jersey |
| Type | Home Improvement Business Contr |
- According to the New Jersey Department of Law & Public Safety, 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 John Kostrowski Jr Plumbing and Heating at the New Jersey Department of Law & Public Safety.
This is a sample of licensing data; click here to access a complete history.