Updated: Apr 05, 2026
Location and Projects
Address
PO BOX 1231, Ripon, CA, 95366
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William Mulder Construction
William Mulder, Ripon, Po Box 1231, Ripon, CA (Owned by: William John Mulder) holds a General Building license according to the California license board.
Their BuildZoom score of 96 ranks in the top 20% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring William Mulder, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William Mulder Services
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William Mulder Contact Information
Phone Number: (209) 679-5446
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Address: PO BOX 1231, Ripon, CA 95366
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Addition to e single family residence to include master bedroom bathroom
Valuation:
N/A
Permit #:
BP-2002791
Status:
notice of code violation
Fee:
$2,128
Permit Type:
N/A
Building Type:
N/A
New single family dwelling w attached garage replacing dwelling c/s keyes rd
Valuation:
N/A
Permit #:
BLD2019-2750
Status:
final
Fee:
$7,075
Permit Type:
Residential repla...
Building Type:
Residential
Electrical service replacement & window change out c/s langworth rd
Valuation:
N/A
Permit #:
BLD2019-2000
Status:
final
Fee:
$235
Permit Type:
Other
Building Type:
Residential
Install and connect new sewer line to city main
Valuation:
$98,230
Permit #:
2019000207
Status:
issued
Fee:
N/A
Permit Type:
plumbing commercial
Building Type:
N/A
Pwsolid sw-const: solid waste construction pw: pw - public works
2019-08-23
N/a
Valuation:
N/A
Permit #:
SW-1903659
Status:
approved
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New 3 bedroom 2 bathroom single family residence with office family room covered porch patio attached 3 car garage with storage
Valuation:
N/A
Permit #:
BP-1903659
Status:
complete
Fee:
$11,987
Permit Type:
N/A
Building Type:
N/A
Remodel addition to convert bedroom to den addition bedroom bathroom and closet remove replace water heater for single family residence
Valuation:
N/A
Permit #:
BP-1802539
Status:
complete
Fee:
$1,665
Permit Type:
N/A
Building Type:
N/A
Disconnect clubhouse from septic and connect to city sewer (( 2 septics to be demolished )) c/s hwy 108 120
Valuation:
N/A
Permit #:
BLD2019-0942
Status:
issued
Fee:
$961
Permit Type:
N/A
Building Type:
N/A
Extend living room bed room kitchen addition of bed room front porch rear patio carport to existng single family residence
Valuation:
N/A
Permit #:
BP-1400344
Status:
complete
Fee:
$2,434
Permit Type:
N/A
Building Type:
N/A
Remodel dwelling (furr in walls rewire new panel replumbing hvac & ductwork enclose 4 exterior doors & windows replace porch) c/s langworth rd
Valuation:
N/A
Permit #:
BLD2019-2247
Status:
final
Fee:
$1,707
Permit Type:
N/A
Building Type:
Residential
Detached pool house with bathroom and game room
Valuation:
N/A
Permit #:
BP-1404297
Status:
complete
Fee:
$2,781
Permit Type:
N/A
Building Type:
N/A
Residence addition. 2274sf bd/bath living spc/and new attached garage
Valuation:
N/A
Permit #:
BP2022-0348
Status:
final
Fee:
$16,323
Permit Type:
Addition
Building Type:
N/A
Detached garage with covered porch and ag storage room w lights plugs
Valuation:
N/A
Permit #:
BP-1200131
Status:
complete
Fee:
$2,035
Permit Type:
N/A
Building Type:
N/A
1177 sqft detached pool house
Valuation:
$0
Permit #:
PS-1403498
Status:
APPLIED
Fee:
$0
Permit Type:
N/A
Building Type:
N/A
Bldres sfr: single family residence bldg: cdd -building
2004-05-19
Replacement 3 bedroom w office single family residence with attached garage and covered patios front and rear (demo bp-0402145)
Valuation:
$358,541
Permit #:
BP-0402141
Status:
final
Fee:
$5,263
Permit Type:
N/A
Building Type:
N/A
Detached restrm building with attached patio cover
Valuation:
N/A
Permit #:
BP-1302580
Status:
complete
Fee:
$1,178
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$355,538
Permit #:
BLD2000-44344
Status:
final
Fee:
$15,442
Permit Type:
Production
Building Type:
N/A
No Description Available
Valuation:
$275,000
Permit #:
479275-0
Status:
final
Fee:
$13,899
Permit Type:
Production
Building Type:
N/A
Bldres sfr: single family residence bldg: cdd -building
2002-06-19
3 bedroom single family residence w/game room office, great room attached 3 car garage front porch and rear patio cover
Valuation:
$206,801
Permit #:
BP-0202229
Status:
final
Fee:
$8,625
Permit Type:
N/A
Building Type:
N/A
Ip: improvement plan for a private right of way to access apn 257-050-37 from airport way. **** lcoation: on the south sie of airport way 3440 feet north of division avenue south of manteca
Valuation:
$0
Permit #:
PA-0800115
Status:
FINAL
Fee:
$341
Permit Type:
N/A
Building Type:
N/A
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Verified License
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William Mulder License info
Verified License
| License # | 401736 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for William Mulder at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
96
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
49
Permits
- Building permit records show that William Mulder has worked on 49 permitted projects.
William Mulder Employees
WM
William John Mulder
Owner