Updated: Aug 18, 2026
Location and Projects
Headquarters Address
, Portland, OR, 97206
Local address
Seattle, WA, 98112
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Davidson, John Duncan Plumber
Davidson, John Duncan, Seattle, WA holds a Plumber, Plumber license and 1 other license according to the Washington license board.
Their BuildZoom score of 92 ranks in the top 32% of 128,670 Washington licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Davidson, John Duncan, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
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Davidson, John Duncan Contact Information
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Building Permits by Davidson, John Duncan
This is a sample of this contractor's permits. Click here to access their complete permit history.
12/11 adult family home for up to 6 adults
Valuation:
$0
Permit #:
ZZ-12-00861
Status:
final
Fee:
$92
Permit Type:
N/A
Building Type:
N/A
Commercial pertreatment review for st.clare hospital oncology conversion project
Valuation:
$0
Permit #:
407830
Status:
Final
Fee:
$50
Permit Type:
N/A
Building Type:
N/A
Mult revs to existing permit b93a2432
Valuation:
N/A
Permit #:
B93Q0329
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Detached shop and carport
Valuation:
$21,600
Permit #:
B94A3447
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Attached garage
Valuation:
$9,504
Permit #:
B93A4095
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Sfres only (oil)
Valuation:
N/A
Permit #:
R9108672
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Sfres only (elec)
Valuation:
N/A
Permit #:
R9108671
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
04-20903
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
PR2025-1579
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Check notes for description
Valuation:
N/A
Permit #:
D-06-0064
Status:
expired
Fee:
N/A
Permit Type:
Driveway residential
Building Type:
N/A
Approval to remove (2) douglas fir (dbh: 18.2 19.4") from the front yard. tree replacement is required at 1:1 ratio. tree replacement shall be primarily native evergreen 6-8 tall in height or native deciduous 2.5 inch caliper anywhere on site
Valuation:
N/A
Permit #:
TREE-2019-01393
Status:
expired
Fee:
N/A
Permit Type:
Single family
Building Type:
N/A
New single family residence includes clear and grade plumbing mechanical and electrical update: addition 2 decks
Valuation:
N/A
Permit #:
03 115123 BS
Status:
expired
Fee:
$4,644
Permit Type:
N/A
Building Type:
N/A
Garage addition to shop
Valuation:
$16,920
Permit #:
B94A2189
Status:
withdrawn
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Davidson, John Duncan License info
Verified License
| License # | DUNCAJB923PG |
| Status | Active |
| State | Washington |
| Type | Plumber, Plumber |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Davidson, John Duncan 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 # | 8582 |
| Status | Inactive |
| State | Washington |
| Type | Architect |
- According to the Washington State Business Licensing , 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 Davidson, John Duncan at the Washington State Business Licensing .
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
12
Permits
- Building permit records show that Davidson, John Duncan has worked on 12 permitted projects.
Davidson, John Duncan Employees
DD
Davidson, John Duncan
Owner