Updated: Jun 02, 2026
Location and Projects
Address
P O BOX 281, Mill Valley, CA, 94942
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Zak Plumbing Co
Zak Plumbing Co, Mill Vly, Po Box 281, Mill Valley, CA (Employees: John Erwin Zak and Spencer Joseph Zak) holds a Plumbing license according to the California license board.
Their BuildZoom score of 103 ranks in the top 10% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Zak Plumbing Co, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Zak Plumbing Co Services
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Zak Plumbing Co Contact Information
Phone Number: (415) 383-6317
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Address: P O BOX 281, Mill Valley, CA 94942
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Zak Plumbing Co Mill Valley
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Zak Plumbing Co has a BuildZoom score of 103, which places them above 90% of 336,931 contractors in California.
Activity
|
1 project
|
2025 |
|
2 projects
|
2023 |
Our building permit records indicate that Zak Plumbing Co has worked on at least
3.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Experience
|
3 projects
|
Plumbing projects |
Analyzing permits over the last 4 years shows that Zak Plumbing Co mostly works on
plumbing project
projects.
Pricing
|
1 project
|
$5k-$20k |
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Work category: 2pb; installing new toilet sink and shower. installing hook up for washing machine
Valuation:
N/A
Permit #:
PW20240725421
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
2 -100 gallon water heaters in ground floor utility room
Valuation:
N/A
Permit #:
PG2308-0005
Status:
final
Fee:
$141
Permit Type:
Residential tank ...
Building Type:
N/A
Replacing a 30 gal water heater with a 30 gal water heater
Valuation:
$2,800
Permit #:
B26987
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
Residential - replace tanked water heater w/tankless water h
Valuation:
$5,500
Permit #:
B-043225
Status:
issued
Fee:
$204
Permit Type:
N/A
Building Type:
N/A
Replace existing water heater all work shall comply to curr
Valuation:
$1,500
Permit #:
B-037009
Status:
final
Fee:
$72
Permit Type:
Minimum plumbing
Building Type:
N/A
Residential- install new water heater
Valuation:
$3,500
Permit #:
B-040462
Status:
final
Fee:
$72
Permit Type:
Minimum plumbing
Building Type:
N/A
Work category: 1p; installing new plumbing in master bathroom. relocate waste and vents in ceiling
Valuation:
$0
Permit #:
PW20160324158
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pa; installing new plumbing in master bathroom.toilet sinks shower and bathtub
Valuation:
$0
Permit #:
PW20150811412
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pa; installing new tub value and bathroom sink. installing new kitchen sink and gas range
Valuation:
$0
Permit #:
PW20150129595
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 5p; install new bar sink capping off existing floor drains installing new water heater to existing bathroom
Valuation:
N/A
Permit #:
PW20180719262
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 1p; installing new plumbing in master bathroom. relocate waste and vents in ceiling
Valuation:
N/A
Permit #:
PW20160324158
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pb; install new bathroom in basement. toilet bathtub and sink. and run new sewer line to sidewalk. also install new sink in kitchen
Valuation:
N/A
Permit #:
PW20121213596
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pb; install new bathroom in basement. toilet bathtub and sink. and run new sewer line to sidewalk. also install new sink in kitchen
Valuation:
$0
Permit #:
PW20121213596
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pa; install new plumbing for two bathrooms lary and kitchen.rough and trimout
Valuation:
$0
Permit #:
PW20150513324
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Address correction from 1385 baker st. to 1383 - 1385 baker st. amendment to pp20131028459. also obtain final inspection
Valuation:
N/A
Permit #:
PP20131205485
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Address correction from 1385 baker st. to 1383 - 1385 baker st. amendment to pp20131028459. also obtain final inspection
Valuation:
$0
Permit #:
PP20131205485
Status:
COMPLETE
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 1p; install new gas line to fireplace range dryer water heater and furnace
Valuation:
$0
Permit #:
PW20150330194
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pa; install new plumbing for master bathroom two guest bathrooms and laundry room for washer dryer
Valuation:
N/A
Permit #:
PW20140618997
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 2pa; install new plumbing for master bathroom two guest bathrooms and lary room for washer dryer
Valuation:
$0
Permit #:
PW20140618997
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 1p; install new plumbing rough and trim out for two kitchens four bathrooms and laundry in garage
Valuation:
N/A
Permit #:
PW20140324864
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Zak Plumbing Co Reviews
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Verified License
BuildZoom confirmed this contractor's license
Zak Plumbing Co License info
Verified License
| License # | 654608 |
| Status | Active |
| State | California |
| Type | Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Zak Plumbing Co at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
103
BuildZoom Score
Bonded
| Bonded Agent | Hudson Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Security National Insurance Company |
88
Permits
- Building permit records show that Zak Plumbing Co has worked on 88 permitted projects.
Zak Plumbing Co Employees
JZ
John Erwin Zak
Sole Owner
SZ
Spencer Joseph Zak
Continuance