Updated: Jul 28, 2026
Location and Projects
Address
509 NE 6TH ST, North Bend, WA, 98045
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Mt Si Plumbing & Heating Inc
Mt Si Plumbing & Heating Inc, 509 NE 6th St, North Bend, WA (Owned by: Dochnahl, Richard D) holds a Plumbing Contractor, Journey Level license and 4 other licenses according to the Tukwila license board.
Their BuildZoom score of 95 ranks in the top 22% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Mt Si Plumbing & Heating Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Mt Si Plumbing & Heating Inc Contact Information
Phone Number: (206) 999-4759
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Address: 509 NE 6TH ST, North Bend, WA 98045
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Building Permits by Mt Si Plumbing & Heating Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
1 basin & 1 water heater
Valuation:
$600
Permit #:
P21004748
Status:
issued
Fee:
$112
Permit Type:
N/A
Building Type:
N/A
Project name: gas piping
Valuation:
N/A
Permit #:
PLMB2020-008
Status:
issued
Fee:
$45
Permit Type:
N/A
Building Type:
N/A
Clawson gas piping, gas piping for outdoor gas fire place
Valuation:
N/A
Permit #:
PLM16-00030
Status:
final
Fee:
$38
Permit Type:
N/A
Building Type:
N/A
Max cafe backflow a (nonresidential) (repair or replacement) project involving 1 back flow preventer
Valuation:
N/A
Permit #:
PLM19-00105
Status:
issued
Fee:
$109
Permit Type:
N/A
Building Type:
N/A
Relocate hot water tank. new washer dryer. addition hose spiget. new water line to house
Valuation:
$10,000
Permit #:
BLD2018-4996
Status:
issued
Fee:
$77
Permit Type:
N/A
Building Type:
plumbing
Gas piping for outdoor firepit
Valuation:
N/A
Permit #:
BLD2017-00379
Status:
expired
Fee:
$144
Permit Type:
N/A
Building Type:
N/A
Adding new master bedroom family room and deck. includes clear/grade plumbing mechanical and elect (lights outlets receptacles)
Valuation:
N/A
Permit #:
04 113606 BR
Status:
final
Fee:
$4,813
Permit Type:
N/A
Building Type:
N/A
Project name: fire station-temporary side sewer permit for trailer being used as a living/sleeping quarters for temporary fire station. ref bld98-00394
Valuation:
N/A
Permit #:
PLM00-00007
Status:
FINALED
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Project name: replumbing house from street water piping meter to house gas , , description - replumbing house from street water piping meter to house gas h2o heater fixtures mt si plumbing - contractor
Valuation:
N/A
Permit #:
2007-145
Status:
filed
Fee:
$51
Permit Type:
N/A
Building Type:
N/A
Install backflow device for water service protection for sunset square cleaners
Valuation:
$500
Permit #:
P110206
Status:
complete
Fee:
$55
Permit Type:
N/A
Building Type:
N/A
Piping for outside fireplace
Valuation:
$750
Permit #:
BLD2020-5746
Status:
issued
Fee:
$55
Permit Type:
N/A
Building Type:
Mechanical
A multi-family alteration project installing {showers, toilet}
Valuation:
N/A
Permit #:
09 126657 BN
Status:
final
Fee:
$49
Permit Type:
N/A
Building Type:
N/A
Replace existing 40 gal water heater with new 50 gal water heater
Valuation:
$900
Permit #:
BLD2014-3327
Status:
issued
Fee:
$35
Permit Type:
N/A
Building Type:
plumbing
Install double check valve for irrigation
Valuation:
$800
Permit #:
BLD2016-3738
Status:
issued
Fee:
$56
Permit Type:
N/A
Building Type:
Miscellaneous
Install gas to range
Valuation:
$600
Permit #:
BLD2016-3737
Status:
final
Fee:
$55
Permit Type:
N/A
Building Type:
Mechanical
Gas to range
Valuation:
$300
Permit #:
BLD2016-3748
Status:
final
Fee:
$55
Permit Type:
N/A
Building Type:
Mechanical
Community church of issaquah, back flow device
Valuation:
N/A
Permit #:
PLM10-00006
Status:
final
Fee:
$79
Permit Type:
N/A
Building Type:
N/A
Remove & replace cast iron w/abs for kitchen area
Valuation:
$10,000
Permit #:
BLD2014-3061
Status:
issued
Fee:
$171
Permit Type:
N/A
Building Type:
plumbing & mechan...
Moving master bathroom fixtures powder room kit sink
Valuation:
N/A
Permit #:
PLM07032
Status:
final
Fee:
$142
Permit Type:
N/A
Building Type:
N/A
Install 75 gal gas water heater in single family residence
Valuation:
N/A
Permit #:
MEC07070
Status:
final
Fee:
$37
Permit Type:
N/A
Building Type:
N/A
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Mt Si Plumbing & Heating Inc Reviews
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Verified License
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Mt Si Plumbing & Heating Inc License info
License Not Verified
| License # | MTSIPSP770MQ |
| Status | Active |
| City | Tukwila |
| Type | Plumbing Contractor, Journey Level |
| Class | Corporation |
| Business Type | Corporation |
- When BuildZoom last verified this license, it had an expiration date of November, 2025. Check the current license status of Mt Si Plumbing & Heating Inc with the The City of Tukwila, WA
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | MTSIPSP770MQ |
| Status | Active |
| State | Washington |
| Type | Plumbing Contractor, Plumbing Contractor |
| Business Type | Corporation |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Mt Si Plumbing & Heating Inc at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | MTSIPSP957KP |
| Status | Inactive |
| City | Tukwila |
| Type | Construction Contractor, Plumbing |
| Class | Corporation |
| Business Type | Corporation |
- According to the The City of Tukwila, WA, 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 Mt Si Plumbing & Heating Inc at the The City of Tukwila, WA.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | MTSIPSP957KP |
| Status | Inactive |
| City | Sammamish |
| Type | Contractor |
| Business Type | Corporation |
- According to the The City of Sammamish, WA, 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 Mt Si Plumbing & Heating Inc at the The City of Sammamish, WA.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | MTSIPSP957KP |
| Status | Inactive |
| State | Washington |
| Type | Construction Contractor, Construction Contractor |
| Business Type | Corporation |
- According to the Washington State Department of Labor & Industries, 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 Mt Si Plumbing & Heating Inc at the Washington State Department of Labor & Industries.
This is a sample of licensing data; click here to access a complete history.
95
BuildZoom Score
Insured
| Insurer | Security National Insurance |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Rli Ins Co |
| Bond Value | $6,000 |
27
Permits
- Building permit records show that Mt Si Plumbing & Heating Inc has worked on 27 permitted projects.
Mt Si Plumbing & Heating Inc Employees
DD
Dochnahl, Richard D
Owner
DD
Dochnahl, Richard Dean
Owner
RD
Richard Dochnahl
President