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Updated: Jun 03, 2026
Location and Projects
Address
19031 CARLTON AVENUE, Castro Valley, CA, 94546
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Welch Construction Engineer
Welch Construction, 19031 Carlton Ave, Castro Valley, CA (Owned by: Deanna Joan Welch, Mark Thomas Welch) holds a General Building license and 5 other licenses 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 Welch Construction, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Welch Construction Services
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Welch Construction Contact Information
Phone Number: (415) 425-3263
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Address: 19031 CARLTON AVENUE, Castro Valley, CA 94546
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Welch Construction Castro Valley
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Welch Construction has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
1 project
|
2025 |
|
1 project
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Welch Construction has worked on at least
4.0 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
|
3 projects
|
$100k-$250k |
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.
New building or addition commercial coach ground mount solar light pole standard electric vehicle ch
2025-07-22
Remodel existing space for use as a coffee shop. work includes: demolishing an existing bathroom and partition walls building new partition walls to create two gender-neutral bathrooms (one ada compliant) a scullery a storage closet a coffee bar and a seating area. installing new hvac electrical and plumbing. installing new storefront doors a secondary exit door and 5 new windows. bui... see more
Valuation:
$200,000
Permit #:
CBNC2024-00308
Status:
issued
Fee:
$25,163
Permit Type:
Addition
Building Type:
N/A
Tenant improvement alteration apartment/condo kitchen-bath remodel
2024-11-20
Remodel existing space for use as a coffee shop. work includes: demolishing an existing bathroom and partition walls building new partition walls to create two gender-neutral bathrooms (one ada compliant) a scullery a storage closet a coffee bar and a seating area. installing new hvac electrical and plumbing. installing new storefront doors a secondary exit door and 5 new windows. bui... see more
Valuation:
$200,000
Permit #:
CBAC2024-00635
Status:
canceled
Fee:
$2,631
Permit Type:
Alteration - remodel
Building Type:
N/A
Epc- revision to com-2213315- change to accessible stall location- revising to utilize those stalls and addition signage to clarify
Valuation:
N/A
Permit #:
COM-2312037
Status:
complete
Fee:
$89
Permit Type:
N/A
Building Type:
N/A
Epc - interior build-out of coffee storage warehouse for office and conditioned storage
Valuation:
$100,000
Permit #:
COM-2213315
Status:
final
Fee:
$6,141
Permit Type:
N/A
Building Type:
N/A
Expedited - revision to com-1905796 to redesignate one door as 2nd required exit (new door was installed on other side of building to satisfy requirement)
Valuation:
N/A
Permit #:
COM-2002328
Status:
complete
Fee:
$430
Permit Type:
N/A
Building Type:
N/A
Building a residential elevator in existing light well
Valuation:
$150,000
Permit #:
202306099670
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
(b) - building alteration - 3+ residential units or commercial (building)
2020-12-19
Replace dry rot & waterproofing at (2) existing residential condo decks of (6) unit residential building. no change to deck footprints or guardrails. (1st & 3rd flrs) 3/12/19 rev#1 addition sister framing and brackets to (e) deck in unit #301
Valuation:
$10,000
Permit #:
B1805129
Status:
expired
Fee:
$689
Permit Type:
N/A
Building Type:
N/A
Tenant improvement for r vida cantina - int/ext alterations & inst
Valuation:
$45,000
Permit #:
2019-03425
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel kitchen and two bathrooms. replace flooring cabinets plumbing fixtures appliances tile upgrade lighting
Valuation:
$125,000
Permit #:
201604043862
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Epc - move kitchen & rplc lb wall in living room
Valuation:
N/A
Permit #:
REAL21-01364
Status:
final
Fee:
$1,020
Permit Type:
N/A
Building Type:
N/A
Main floor of house: install (n) openings (2) in (e) load-bearing wall on study room & dining room
Valuation:
$20,000
Permit #:
201709259447
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
(e) - electrical - 3+ residential units or commercial (building)
2018-11-21
Senior living high rise apartments: 3rd floor: partition existing rec room into 2 rec rooms with hallway - adding 3 receptacles and 3 switches
Valuation:
N/A
Permit #:
E1802787
Status:
final
Fee:
$207
Permit Type:
N/A
Building Type:
N/A
Epc-tenant improvements for temple coffee
Valuation:
N/A
Permit #:
COAL20-03949
Status:
final
Fee:
$2,001
Permit Type:
N/A
Building Type:
N/A
(p) - plumbing - 3+ residential units or commercial (building)
2018-12-20
Replace (3) tub/showers (3) dishwashers (3) water lines at front units of (6) unit residential building
Valuation:
N/A
Permit #:
P1803175
Status:
expired
Fee:
$413
Permit Type:
N/A
Building Type:
N/A
Commercial/multi-family/condo/apt. - change order
2019-10-25
Ch-01 inspector requested a reflected ceiling plan with all lighting
Valuation:
N/A
Permit #:
CBAC2019-00351-01
Status:
issued
Fee:
N/A
Permit Type:
Alteration - remodel
Building Type:
N/A
Demolish work for future tenant improvement temple coffee - epr
Valuation:
N/A
Permit #:
CODE20-02966
Status:
issued
Fee:
$614
Permit Type:
Commercial
Building Type:
N/A
Expedited-10-5-5 - shared plan set com-1905798-remodel existing office space to coffee shop 2413sf non-sprinklered new interior partitions demolish old partitions electrical mechanical plumbing new hvac.*****revision : change masonry block wall to a - pour in place ; addition drop ceiling within dining room area; clarifying shear transfer ( all changes per inspector correction list (s... see more
Valuation:
$225,000
Permit #:
COM-1905796
Status:
complete
Fee:
$7,695
Permit Type:
N/A
Building Type:
N/A
Remodel kitchen new cabinets & countertops update lighting and plumbing addition a new sink. remodel bathrooms with new tiles fixtures vanity & countertops
Valuation:
$150,000
Permit #:
201601217596
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
(expedited - 3-3-3) - revision to com-1905796 : change masonry block wall to a - pour in place ; addition drop ceiling within dining room area; clarifying shear transfer ( all changes per inspector correction list (shared plans com-1920950)
Valuation:
N/A
Permit #:
COM-1920946
Status:
complete
Fee:
$443
Permit Type:
N/A
Building Type:
N/A
(b) - building alteration - 3+ residential units or commercial (building)
2021-03-31
Senior living high rise apartments: 11th floor: install demountable partition wall of frosted glass panes and doors to divide existing dining rooms. scope includes upgrading 2 restrooms on same floor. no exterior work
Valuation:
$10,000
Permit #:
B1901434
Status:
expired
Fee:
$689
Permit Type:
N/A
Building Type:
N/A
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Welch Construction Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Welch Construction License info
Verified License
| License # | 605159 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Partnership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Welch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 772107 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Partnership |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Welch Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 859922 |
| Status | Active |
| State | California |
| Type | General Engineering, Earthwork And Paving |
| Business Type | Partnership |
- BuildZoom verified this license was active as of December 2025.
Verify this license's status for Welch 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 # | 961916 |
| Status | Inactive |
| State | California |
| Type | General Engineering, Earthwork And Paving |
| Business Type | Partnership |
- 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 Welch 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 # | 960111 |
| Status | Inactive |
| State | California |
| Type | General Engineering |
| Business Type | Partnership |
- 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 Welch 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 # | 563055 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Partnership |
- 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 Welch Construction 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 | Hudson Insurance Company |
| Bond Value | $15,000 |
37
Permits
- Building permit records show that Welch Construction has worked on 37 permitted projects.
Welch Construction Employees
BW
Bhaskar James Welch
Sole Owner
DW
Deanna Joan Welch
Qualify Partner
DW
Deanna Joan Welch, Mark Thomas Welch
Owner
MW
Mark Franklin Welch
Sole Owner
MW
Mark Thomas Welch
General Partner
SW
Steve Owen Welch
Sole Owner