Updated: May 27, 2026
Location
Address
Black Diamond, WA, 98010
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Koch, Karl H Construction
Koch, Karl H, Black Diamond, WA holds a Plumber, Plumber license and 5 other licenses according to the Washington 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 Koch, Karl H, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
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Verified License
BuildZoom confirmed this contractor's license
Koch, Karl H License info
Verified License
| License # | KOCH*KH074D3 |
| Status | Active |
| State | Washington |
| Type | Plumber, Plumber |
| Business Type | Individual |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Koch, Karl H at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | KOCH*KH949N9 |
| Status | Active |
| State | Washington |
| Type | Electrician, Electrician, Electrician |
| Business Type | Individual |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Koch, Karl H at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | KOCHKH940LM |
| Status | Active |
| State | Washington |
| Type | Medical Gas, General |
| Business Type | Individual |
- When BuildZoom last verified this license, it had an expiration date of August, 2018. Check the current license status of Koch, Karl H with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | KOCH KH074D3 |
| Status | Active |
| State | Washington |
| Type | Plumber |
| Business Type | Individual |
- When BuildZoom last verified this license, it had an expiration date of August, 2018. Check the current license status of Koch, Karl H with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | KOCH KH940LM |
| Status | Active |
| State | Washington |
| Type | Medical Gas, General |
| Business Type | Individual |
- When BuildZoom last verified this license, it had an expiration date of August, 2018. Check the current license status of Koch, Karl H with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.
License Not Verified
| License # | KOCH KH949N9 |
| Status | Active |
| State | Washington |
| Type | Electrician, Hvac/Rfrg, Maintenance |
| Business Type | Individual |
- When BuildZoom last verified this license, it had an expiration date of August, 2018. Check the current license status of Koch, Karl H with the Washington State Department of Labor & Industries
This is a sample of licensing data; click here to access a complete history.