Updated: Jun 12, 2026
Location and Projects
Address
357 EAST SCHOOL STREET, Cotati, CA, 94931
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William Underwood Construction
Serving Cotati, CA and the surrounding Sonoma County area, William Underwood Construction has over three decades of experience in residential building and remodeling. Active since 1988, the company specializes in custom home construction, additions, and home renovations. Projects include new single-family homes, kitchen and bath remodels, and whole-house improvements tailored for local homeowners. William Underwood is closely involved in project planning and on-site supervision, drawing on comprehensive building knowledge developed over his extensive career. The firm uses established construction methods and works with clients throughout the design and build process, offering guidance on materials and layout solutions. William Underwood Construction is known locally for managing projects that meet the specific functional and aesthetic needs of Sonoma County residents.
William Underwood Construction Services
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William Underwood Construction Contact Information
Phone Number: (707) 664-9415
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Address: 357 EAST SCHOOL STREET, Cotati, CA 94931
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William Underwood Construction Cotati
Quality
100
87th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
William Underwood Construction has a BuildZoom score of 100, which places them above 87% of 336,931 contractors in California.
Activity
|
3 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that William Underwood Construction has worked on at least
5.0 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.
Pricing
|
1 project
|
< $5k |
|
2 projects
|
$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.
Building Permits by William Underwood Construction
This is a sample of this contractor's permits. Click here to access their complete permit history.
Emergency repair for vehicle collision along the southern exterior wall at 492 2nd st within parcel for 494 2nd st
Valuation:
$15,000
Permit #:
BLDC-2024-0051
Status:
complete
Fee:
$818
Permit Type:
N/A
Building Type:
N/A
First 5 solano tenant improvement to install new
Valuation:
N/A
Permit #:
BP19-0938
Status:
final
Fee:
$11,193
Permit Type:
Tenant improvement
Building Type:
N/A
Like-for-like repair per ce19-0287 (vehicle into building at unit 104). non-structural repairs to: stucco drywall non-load baring demising wall door window exterior light fixture and gfi receptacle and patio fence. scope described on approved plan
Valuation:
$10,000
Permit #:
B19-2312
Status:
final
Fee:
$595
Permit Type:
N/A
Building Type:
N/A
Replace existing zinsco panel with new 125 amp electrical main panel and painting
Valuation:
$4,500
Permit #:
B24-3394
Status:
final
Fee:
$221
Permit Type:
N/A
Building Type:
N/A
Seismic retro fit foundation cripple wall less than 3’ in height install anchor bolts as needed
Valuation:
$11,200
Permit #:
BLDR-2023-0473
Status:
complete
Fee:
$395
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel
Valuation:
$6,000
Permit #:
BC19-013
Status:
final
Fee:
$712
Permit Type:
New construction
Building Type:
N/A
Replace stolen main panel 800 amps
Valuation:
N/A
Permit #:
EL23-00005
Status:
issued
Fee:
N/A
Permit Type:
325a to 1000a
Building Type:
N/A
30 square siding dryrot repair
Valuation:
N/A
Permit #:
BIRP23-009664
Status:
final
Fee:
$137
Permit Type:
N/A
Building Type:
N/A
Replacement of a 5 gal electric water heater
Valuation:
N/A
Permit #:
PL19-0347
Status:
issued
Fee:
$80
Permit Type:
Water heater repl...
Building Type:
N/A
Mr cool - repair stucco
Valuation:
N/A
Permit #:
BP-2021-1875
Status:
final
Fee:
N/A
Permit Type:
Alteration/remodel
Building Type:
N/A
For single family dwelling - repair follow fallen tree - re-roof with new sheathing - install 2 sq rolled roofing and 2 sq class a comparable shingles - minor re-siding replace (e) meter mast and subpanel 100 amps
Valuation:
N/A
Permit #:
BLD15-5823
Status:
final
Fee:
$586
Permit Type:
N/A
Building Type:
N/A
40 lights 35 switches 35 receptacles 3 fans 22 circuits 1 dishwasher 1 garbage disposal 1 microwave 1 range 6 smoke detectors
Valuation:
$0
Permit #:
E20150824994
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
40 lights 35 switches 35 receptacles 3 fans 22 circuits 1 dishwasher 1 garbage disposal 1 microwave 1 range 6 smoke detectors
Valuation:
N/A
Permit #:
E20150824994
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Coastal development permit for slope repair at 7591 caminito avola in the sf zone of la jolla shores planned district within the la jolla community plan, coastal overlay (non-appealable), residential tandem parking, transit area. approved by designated staff in development services on february 28, 2008, resolution no. cm-5959
Valuation:
$0
Permit #:
487051
Status:
Issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace (e) roof top hvac units-one 5 ton one
Valuation:
N/A
Permit #:
ME14-0184
Status:
issued
Fee:
$586
Permit Type:
Commercial
Building Type:
N/A
Commercial tenant improvement: installation of
Valuation:
N/A
Permit #:
BP16-0058
Status:
final
Fee:
$871
Permit Type:
Tenant improvement
Building Type:
N/A
To attain the tco for employee only offices. no
Valuation:
N/A
Permit #:
TCO20-0002
Status:
final
Fee:
$500
Permit Type:
Tenant improvement
Building Type:
N/A
Hot mop shower pan
Valuation:
$0
Permit #:
PP20150824379
Status:
COMPLETE
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace siding and trim and possible sheetrock for new electric panel. replace electric panel with work by licensed electrical contractor
Valuation:
N/A
Permit #:
B04-5000
Status:
final
Fee:
$90
Permit Type:
N/A
Building Type:
N/A
Termite repair dry rot repair as needed interior and exterior - dem05-0336. 8-2-2006 adding to the scope of work upgrade two existing meters one 200a and one 100a
Valuation:
N/A
Permit #:
BLD05-6645
Status:
final
Fee:
$873
Permit Type:
N/A
Building Type:
N/A
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Projects
William Underwood Construction Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
William Underwood Construction License info
Verified License
| License # | 686123 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for William Underwood Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 788221 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, 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 William Underwood Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 284900 |
| Status | Inactive |
| State | California |
| Type | Painting And Decorating |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, 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 William Underwood Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
100
BuildZoom Score
Bonded
| Bonded Agent | Business Alliance Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Benchmark Insurance Company |
54
Permits
- Building permit records show that William Underwood Construction has worked on 54 permitted projects.
William Underwood Construction Employees
JU
James Robert Underwood
General Partner
WU
William Arrington Underwood
Owner
WJ
William John Underwood Jr
Sole Owner