Updated: Mar 02, 2026
Location and Projects
Address
668 RAILROD AVE UNIT C, South San Francisco, CA, 94080
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J Gerstenkorn Builders Construction
Serving the South San Francisco area, J Gerstenkorn Builders specializes in residential remodeling and construction projects. With 22 years of experience, the company is equipped to handle a range of building needs, from interior renovations to home additions. J Gerstenkorn Builders works with homeowners throughout the region, providing project management and construction services tailored to each property. The firm’s experience includes modernizing living spaces, updating kitchens and bathrooms, and enhancing overall home functionality. Their project portfolio demonstrates capability across various phases of construction, reflecting a strong background in both new builds and existing structure updates. Clients in South San Francisco and the surrounding neighborhoods rely on J Gerstenkorn Builders for efficient, code-compliant work on single-family residences and other residential properties.
J Gerstenkorn Builders Services
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J Gerstenkorn Builders Contact Information
Phone Number: (415) 405-6716
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Address: 668 RAILROD AVE UNIT C, South San Francisco, CA 94080
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J Gerstenkorn Builders South San Francisco
Quality
101
88th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
J Gerstenkorn Builders has a BuildZoom score of 101, which places them above 88% of 336,931 contractors in California.
Activity
|
2 projects
|
2025 |
|
1 project
|
2024 |
|
4 projects
|
2023 |
Our building permit records indicate that J Gerstenkorn Builders 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.
Pricing
|
2 projects
|
< $5k |
|
1 project
|
$5k-$20k |
|
1 project
|
$20k-$50k |
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 J Gerstenkorn Builders
This is a sample of this contractor's permits. Click here to access their complete permit history.
Basic kitchen remodel in-kind addition 1 gfci to counter area addition recessed lighting in kitchen & living area replace angle stops p-trap addition floor tile all work in-kind
Valuation:
$50,000
Permit #:
202304055094
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
New cal-green single family dwelling with 2nd unit. single family dwelling 2324 sq. ft. with additional 2nd unit 810 sq.ft. main floor 4 bedroom 2.5 bathroom. second unit (lower floor garage level) 2 bedroom 1 bathroom with kitchen resubmittal # 1 - pvt - 02/06/2020 response to building and geo comments - architectural and structural plans ele mec & energy only. change designer - from... see more
Valuation:
N/A
Permit #:
BLD2018-02447
Status:
final
Fee:
$28,723
Permit Type:
N/A
Building Type:
N/A
Replace front facing stucco- repair dryrot in kind. replace front entry stairs in kind. replace (2) front windows in kind. 7 risers being removed and replaced. reference p/a # 202210023615
Valuation:
$2,000
Permit #:
202210285430
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
In kind replacement of (3) windows (windows in rear of building/not visible from street). replacement of the tile and shower pan in kind. replace old shower drain in kind
Valuation:
$20,000
Permit #:
202209011729
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Remove wall between dining and livning. addition beam and footings. replace extg rear bedroom windows to new vinyle 3x4 single hung. to comply with complaint 202294470
Valuation:
$20,000
Permit #:
202209021835
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Bathroom remodel/swap toiler vanity/add one recessed light replace tub. replace plumbing fixtures. repair dry rot exterior stairs under 50%. replace in kind
Valuation:
$20,000
Permit #:
202210033615
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Install recessed lighting (3 lights) in kitchen area and living area (5 lights) and 1 additional plug. pa#202304055094
Valuation:
N/A
Permit #:
E202304055978
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Amend to previous permit: e202304055978 - install retrofit 70a panel. replace all breakers to code. obtain a final inspection
Valuation:
N/A
Permit #:
E202308168754
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Reduction of work scope under pa 202308164545: reroof willnot be done
Valuation:
$1
Permit #:
202507211247
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Bathroom remodel swap toilet vanity reconfigure copper for swap reconfig drains new plumbing fixtures
Valuation:
N/A
Permit #:
PP20221003369
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage level storage bathroom to comply with complaint #202292535
Valuation:
N/A
Permit #:
E202304055979
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage level bathroom storage to comply with complaint #2022692535
Valuation:
N/A
Permit #:
PP20230405311
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace sink in kitchen angle stops p-trap (all in-kind)
Valuation:
N/A
Permit #:
PP20230405309
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
2 new circuits new lighting gfc outlets
Valuation:
N/A
Permit #:
E202210032779
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace (1) shower pan
Valuation:
N/A
Permit #:
PP20220901830
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage level - legalize storage w bathroom. comply w complaint# 200292535
Valuation:
$27,985
Permit #:
202209072012
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Replace belly band trim in front of building in kind
Valuation:
$1,000
Permit #:
202507150843
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Reroofing and non-structural deck repair
Valuation:
$10,000
Permit #:
202308164545
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Demolish existing stairs frame in walls construct circular stairs metal install concrete pad building two decks. remove (e) wooden stairs deck and construct new circular metal stairs with two light weight decks
Valuation:
$30,000
Permit #:
202104148543
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Upgrade to gfi 2 led cans in lower unit bathroom
Valuation:
N/A
Permit #:
E202107064058
Status:
filed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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J Gerstenkorn Builders Reviews
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J Gerstenkorn Builders License info
Verified License
| License # | 1064688 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for J Gerstenkorn Builders 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 | This License Filed A Contractor's Bond With |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
10
Permits
- Building permit records show that J Gerstenkorn Builders has worked on 10 permitted projects.
J Gerstenkorn Builders Employees
JG
John Gerstenkorn
Rmo / Ceo / Pres
JG
John Gerstenkorn
Rmo / Ceo / Pres