Updated: May 03, 2026
Location and Projects
Address
18534 CENTER ST, Castro Valley, CA, 94546
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GX Construction Co
Serving Castro Valley and surrounding areas in the Bay Area, GX Construction Co specializes in residential remodeling and new construction projects. With 11 years of industry experience, the company manages a range of construction services, including kitchen and bathroom remodels, room additions, and custom home building. GX Construction Co works with homeowners to upgrade existing properties or create new living spaces, tailoring each project to client needs. The company emphasizes on-time project management and clear communication from initial consultation through project completion. GX Construction Co provides guidance on materials and design options to support clients throughout the construction process. Projects are coordinated to minimize disruption and ensure smooth progress from demolition to final finishes.
GX Construction Co Services
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GX Construction Co Contact Information
Phone Number: (415) 725-0938
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Address: 18534 CENTER ST, Castro Valley, CA 94546
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GX Construction Co Castro Valley
Quality
103
90th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
GX Construction Co has a BuildZoom score of 103, which places them above 90% of 336,931 contractors in California.
Activity
|
3 projects
|
2025 |
|
2 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that GX Construction Co has worked on at least
7.0 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
|
Kitchen remodels |
Analyzing permits over the last 4 years shows that GX Construction Co mostly works on
kitchen remodel
projects.
Pricing
|
2 projects
|
$20k-$50k |
|
2 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.
929 sq ft adu 10/27/2022 8:20:55 am (kathleen collins) kathleen the also still need to abandon the old service at the water main. last i heard from the contractor they were waiting on a clamp that ford had to made for them. edit note delete note 10/27/2022 8:22:21 am (kathleen collins) chantel delay service line plumbing chantel attached is the backflow test sheet as well as the meter... see more
Valuation:
$232,250
Permit #:
BD1902-017
Status:
final
Fee:
$26,150
Permit Type:
New second unit
Building Type:
N/A
Convert existing detached 2-car garage of 442 and storage room of 252 into a 1-car garage of 236sf and adu of 458sf. (square footage and envelope of structure to remain same size)
Valuation:
$135,286
Permit #:
BD-2023-292283
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace and upgrade the main service from 60 to 200 amp. relocate the subpanel to hallway. addition plywood to the cripple walls at the crawlspace. addition bolts and clips to the mudsill at the crawlspace addition sill plate connectors at the crawlspace. revision #1: relocate 3 plumbing vent pipes. (iss 9.3.25)
Valuation:
$40,000
Permit #:
BD-2023-291676
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition recess lights rep 2 windows 3 sliding doors
Valuation:
$5,000
Permit #:
B25-1292
Status:
final
Fee:
$431
Permit Type:
Alterations
Building Type:
N/A
Replace the damage wood at the house back side. replace all windows and sliding door. replace hand rail. install cement sliding. paint. u-factor
Valuation:
$85,000
Permit #:
202110080133
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
(rbc) - building residential combo alteration- 1 & 2 unit residential (building)
2019-04-19
Non-structural kitchen and bathroom remodel for single family dwelling with scope to include relocating the furnace to the attic and relocating both washer & dryer. no change to wall layout and no exterior work. meps included
Valuation:
$30,000
Permit #:
RBC1900414
Status:
final
Fee:
$1,453
Permit Type:
N/A
Building Type:
N/A
Replace windows. new m bathroom kitchen & bathroom remodel
Valuation:
$50,000
Permit #:
B2024-0321
Status:
final
Fee:
$4,014
Permit Type:
Alteration
Building Type:
N/A
Residential kitchen and bathroom remodel like for like
2024-02-01
Like-4-like remodel of kitchen and (2) bathrooms
Valuation:
$35,000
Permit #:
BLD2024-05162
Status:
complete
Fee:
$849
Permit Type:
N/A
Building Type:
N/A
Remodel bathroom #1: like for like. remodel bathroom #2: replace tubw shower, reduce window size addition dual sink see text
Valuation:
$57,000
Permit #:
201906299
Status:
complete
Fee:
$1,449
Permit Type:
Residential remodel
Building Type:
N/A
Update kitchen no wall moving (see notes!!!)
Valuation:
N/A
Permit #:
B24-2495
Status:
final
Fee:
N/A
Permit Type:
Residential
Building Type:
N/A
Dry rot repair around roof vent - install gutter - addition 1 layer of comparable shingles
Valuation:
$10,000
Permit #:
B19-1270
Status:
final
Fee:
$672
Permit Type:
N/A
Building Type:
N/A
Replace windows sliding door kitchen cabinets andcountertops move (e) subpanel from closet to hallway
Valuation:
$22,000
Permit #:
201803603
Status:
complete
Fee:
$691
Permit Type:
Residential remodel
Building Type:
N/A
Reset electrical meter.(b lic. contractor doing work on #201906299 also)
Valuation:
$1,800
Permit #:
201906985
Status:
complete
Fee:
$237
Permit Type:
Electrical permit
Building Type:
N/A
Reset electrical meter.(b lic. contractor doing work on #201906299 also)
Valuation:
$1,800
Permit #:
201906985
Status:
complete
Fee:
$237
Permit Type:
Electrical permit
Building Type:
N/A
Remodel the kitchen and bathrooms; remove the existing fireplace in the living room; replace 5 aluminum windows ;replace the existing furnace to high efficiency and relocate it into the ceiling; replace the sub panel in the garage. install new electrical for kitchen and hallway bathroom. install recessed lights to the living room dining room and hallway ceiling. install smoke detector... see more
Valuation:
N/A
Permit #:
BLD2021-04427
Status:
complete
Fee:
$2,394
Permit Type:
N/A
Building Type:
N/A
Construction power pole
Valuation:
$1,000
Permit #:
BD2003-022
Status:
final
Fee:
$127
Permit Type:
New
Building Type:
N/A
To addition to and remodel an existing single family dwelling per plans and calc's adding a second story (1, 072 sf addition 1, 425 sf remodel 180 sf deck). the first floor will have a living room dining room kitchen laundry 1/2 bathroom 2 bedrooms full bathroom. the second floor will have three bedrooms 2 baths family room hall deck
Valuation:
N/A
Permit #:
BLD2015-02229
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remodel kitchen & 2 - bathrooms remove & replace. addition 2-new exterior doors addition 3- new windows. new electrical system new hvac move weatherhead new water heater & change the location to new mechanical room in crawl space. new deck at rear with doors to access rear yard 12/22/17 racuff-- amended scope of work to include 200 amp service 100 amp subpanel vehicle charger at garage
Valuation:
N/A
Permit #:
BIAL17-006137
Status:
final
Fee:
$3,044
Permit Type:
N/A
Building Type:
N/A
New subpanel and rewire of three bedrooms and 3 bathrooms; 22 lights 15 switches 20 receptacles 3 fans 1 dishwasher 5 smoke detectors
Valuation:
$0
Permit #:
E201601274446
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
( n ) s f d 2 c a r g a r a g e & a t t a c h e d a d u
Valuation:
$1,060,850
Permit #:
B21-0298
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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GX Construction Co License info
Verified License
| License # | 1008387 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for GX Construction 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 | Business Alliance Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
20
Permits
- Building permit records show that GX Construction Co has worked on 20 permitted projects.
GX Construction Co Employees
GW
Gan Xin Wu
Owner