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Updated: Apr 25, 2026
Location and Projects
Address
679 EL CENTRO RD, El Sobrante, CA, 94803
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Cornish Contracting Engineer
Cornish Contracting, 679 El Centro Rd, El Sobrante, CA (Owned by: Robert Clayton Cornish) holds a General Building, Well Drilling, General Engineering license according to the California license board.
Their BuildZoom score of 101 ranks in the top 12% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Cornish Contracting, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Cornish Contracting Services
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Cornish Contracting Contact Information
Phone Number: (925) 595-2420
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Address: 679 EL CENTRO RD, El Sobrante, CA 94803
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Cornish Contracting El Sobrante
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornish Contracting has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
1 project
|
2024 |
|
4 projects
|
2023 |
Our building permit records indicate that Cornish Contracting 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.
Experience
|
4 projects
|
Home Additions |
Analyzing permits over the last 4 years shows that Cornish Contracting mostly works on
home addition
projects.
Pricing
|
1 project
|
< $5k |
|
1 project
|
$5k-$20k |
|
3 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
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.
2955 sq ft tenant improvement for take-out only 1) demolish interior walls finishes plumbing electrical fixtures 2) addition of new partition walls for lobby bakers area and back of house 3) electrical alterations for power lighting fixtures and equipment 4) alteration to mechanical with new roof top units duct work hood and air terminals 5) plumbing alteration at existing restroom ne... see more
Valuation:
$285,000
Permit #:
2023 087578 CI
Status:
issued
Fee:
$6,500
Permit Type:
Retail
Building Type:
N/A
*8/3/23 revision #2: title 24 updated 3/18/23 revision 1: -hand sink added to front of bakery area behind display freezer wall shifting equipment and walls back to accommodate. -partial height wall added between new hand sink and boxing station 2955 sq ft tenant improvement for take-out only 1) demolish interior walls finishes plumbing electrical fixtures 2) addition of new partition ... see more
Valuation:
$285,000
Permit #:
2022 696091 CI
Status:
issued
Fee:
$6,651
Permit Type:
Retail
Building Type:
N/A
499 sq ft residential addition at rear side of home. includes laundry room bedroom and bathroom
Valuation:
$143,268
Permit #:
BLDG-2022-02630
Status:
issued
Fee:
$6,022
Permit Type:
N/A
Building Type:
N/A
Bathroom remodel and expansion; remove existing closet and expand bathroom into closet space. install recessed lights and bathroom fan. install new flooring
Valuation:
$8,100
Permit #:
BLDG-2022-02515
Status:
final
Fee:
$724
Permit Type:
N/A
Building Type:
N/A
454 sq ft addition that will include a bedroom bathroom with walk-in shower and closet
Valuation:
$129,620
Permit #:
BLDG-2022-02632
Status:
final
Fee:
$5,548
Permit Type:
N/A
Building Type:
N/A
Construct a 499 sq ft raised foundation wood framed addition constisting of master bedroom bathroom and closet. remove non-load bearing bedroom wall in existing home to increase living space
Valuation:
$146,250
Permit #:
BLDG-2023-02195
Status:
issued
Fee:
$6,939
Permit Type:
N/A
Building Type:
N/A
Relocate electrical panel to nw corner of new addition and upgrade panel from 100 to 200 amps
Valuation:
$2,500
Permit #:
BLDG-2023-01318
Status:
final
Fee:
$177
Permit Type:
N/A
Building Type:
N/A
Master bathroom remodel - remove existing vanities shower and closets. building new closet walls and shower. install new shower vanities and cabinets. new electrical outlets and lights will be installed
Valuation:
$14,900
Permit #:
B20-2481
Status:
final
Fee:
$561
Permit Type:
N/A
Building Type:
N/A
House addition of 432 s.f.; mechanical and electrical work for addition
Valuation:
$84,620
Permit #:
BLDG-2020-00614
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Crumbl cookies: revised back of house wall and electrical pa
Valuation:
N/A
Permit #:
B-RV22-0122
Status:
final
Fee:
$502
Permit Type:
Revision
Building Type:
N/A
275 sq ft bedroom bathroom closet addition to dwelling
Valuation:
$69,300
Permit #:
BLDG-2021-00218
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Construct 499 sq. ft. (36'-11 x 13'-6") light-frame wood construction addition to existing house. addition will include an addition to the existing family room and a new master bedroom bathroom and closet
Valuation:
$123,500
Permit #:
BLDG-2021-01454
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Crumbl cookies: tenant improvement of a take-out cookie bake
Valuation:
$130,000
Permit #:
B-BP21-0698
Status:
final
Fee:
$8,195
Permit Type:
Tenant improvement
Building Type:
N/A
Convert from overhead to underground electrical
Valuation:
$0
Permit #:
B2004-05436
Status:
Closed Complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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BZ Score
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Projects
Cornish Contracting Reviews
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Verified License
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Cornish Contracting License info
Verified License
| License # | 807527 |
| Status | Active |
| State | California |
| Type | General Building, Well Drilling, General Engineering |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Cornish Contracting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
101
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
10
Permits
- Building permit records show that Cornish Contracting has worked on 10 permitted projects.
Cornish Contracting Employees
RC
Robert Clayton Cornish
Owner