Updated: Apr 12, 2026
Location and Projects
Address
P O BOX 1111, San Ramon, CA, 94583
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O'sullivan & Son Construction Inc
O'sullivan & Son Construction Inc serves residential and commercial clients throughout San Ramon, California, and the surrounding Bay Area. With over a decade of experience, the company handles a variety of construction projects including custom home building, remodeling, and additions. Project examples include kitchen renovations, bathroom remodels, garage conversions, and full home renovations. O'sullivan & Son Construction Inc also undertakes commercial buildouts and tenant improvements for local businesses. The team manages all phases of construction, from planning and permitting to framing, finish carpentry, and final inspections. Whether working on single-family homes or commercial properties, O'sullivan & Son Construction Inc draws on 14 years of experience to deliver project solutions suited to the needs of property owners in San Ramon and nearby communities.
O'sullivan & Son Construction Inc Services
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O'sullivan & Son Construction Inc Contact Information
Phone Number: (415) 235-5006
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Address: P O BOX 1111, San Ramon, CA 94583
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O'sullivan & Son Construction Inc San Ramon
Quality
109
95th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
O'sullivan & Son Construction Inc has a BuildZoom score of 109, which places them above 95% of 336,931 contractors in California.
Activity
|
3 projects
|
2025 |
|
7 projects
|
2024 |
|
10 projects
|
2023 |
Our building permit records indicate that O'sullivan & Son Construction Inc has worked on at least
20.0 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
|
Commercial Renovations |
|
6 projects
|
Kitchen remodels |
Analyzing permits over the last 4 years shows that O'sullivan & Son Construction Inc mostly works on
kitchen remodel
and commercial renovation
projects.
Pricing
|
3 projects
|
< $5k |
|
3 projects
|
$5k-$20k |
|
7 projects
|
$20k-$50k |
|
2 projects
|
$100k-$250k |
The typical size of their permits is approximately $24,800. This graph shows the distribution of these job values.
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 O'sullivan & Son Construction Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Renovation of (e) kitchen and bathrooms. main floor bathroom exterior wall to be infilled to align with footprint of (e) floor above. (e) fixtures to be replaced. new lighting electrical and exhaust fans to be installed. (2) new awning windows to be installed at bathrooms (2) new sliding doors to
Valuation:
$112,000
Permit #:
202409251547
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Rev 202409251547 to include demolish of (e) rear deck and construction of (n) deck. replace windows within the same opening facing the side and rear. (n) opening for fire rated door between garage and interior stairway
Valuation:
$25,000
Permit #:
202412025893
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Reface 2 existing pole signs
Valuation:
$6,695
Permit #:
202303284531
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
-
Rev to pa# 2022-0516-4277 & 2022-1102-5735: to reflect (e) as-built conditions at ground fl. remodel w horizontal expansion to garage space below (e) habitable space & stair within an (e) light well
Valuation:
$25,000
Permit #:
202303234247
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Fire alarm tenant improvement basement fire pump room 202209021794 provide 1 new smoke in existing fire pump room. 3 new modules for monitoring and control of men fsds provide 2 new monitoring points for new fire pump controller
Valuation:
$5,000
Permit #:
202304034887
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Ref physical inspection report #8489 legalize existing kitchen sink & wet bar sink at the commercial unit retail space
Valuation:
$5,000
Permit #:
202302172242
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
15 - retail sales
Revision to pa# 2024-1202-5893 revision to lower exterior deck foot print & deck foundation
Valuation:
$1
Permit #:
202501249078
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Ground level of interior tenant improvemnet for interior design firm scope of work includes new finishes new non-structural partitions new doors and glazing new ada restroom new plumbing fixtures and new electrical
Valuation:
$150,000
Permit #:
202304045043
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
10 - office
#5: remodel bathroom room and make closet bigger. close up door between bathroom and closet. move bathroom entry door. new tub vanity and toilet
Valuation:
$50,000
Permit #:
202405011186
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Remodel existing bathroom addition new bathroom upstairs. down stairs: 2 rooms update existing plugs and ceiling lights. 3 lights 4 switches 10 receptacles 2 fans
Valuation:
N/A
Permit #:
E202307067893
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
1/f: ugrade electrical in living room & bedroom 3 remove fireplace patch floor/walls in-kind; 2/f: addition new bathroom remodel (e) bathroom; garage: install new car charger
Valuation:
$40,000
Permit #:
202305268691
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Remove lowest fire escape platform serving rear unit (2-story unit so fire escape access is maintained) replace/extend ladder to rear yard deck below. (2) means of egress for building fully sprinklered
Valuation:
$8,150
Permit #:
202302162087
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Remove (e) kitchen supply and install new kitchen upgrade electrical and chanage location of existing gas line
Valuation:
$25,000
Permit #:
202302172223
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Voluntary structural strengthening in garage along north east west & south wall by adding plywood sheathing and sill anchors
Valuation:
$40,000
Permit #:
202406063921
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
28 - 2 family dwe...
Remove existing countertop and replace with new countertop in kitchen
Valuation:
$1,500
Permit #:
202509175466
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
No expansion of existing building envelope. alterations to kitchen and bathrooms. structural work to accommodate layout changes
Valuation:
$250,000
Permit #:
201708296332
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
27 - 1 family dwe...
Down stairs reinstall 4 can lights in the new bedroom. relocate light switches. new outlet for fridge
Valuation:
N/A
Permit #:
E202103222235
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Unit #6: remodel kitchen in-kind - replace cabinets and counter tops
Valuation:
$24,600
Permit #:
202305177959
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
Unit #6: remodel kitchen in-kind - replace cabinets and counter tops
Valuation:
$24,600
Permit #:
202305177959
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
24 - apartments
No Description Available
Valuation:
$7,000
Permit #:
BLD2024-0121
Status:
issued
Fee:
$492
Permit Type:
Alteration
Building Type:
N/A
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O'sullivan & Son Construction Inc License info
Verified License
| License # | 902262 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for O'sullivan & Son Construction Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
109
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Benchmark Insurance Company |
29
Permits
- Building permit records show that O'sullivan & Son Construction Inc has worked on 29 permitted projects.
O'sullivan & Son Construction Inc Employees
MO
Mollie Kay O'sullivan
Officer
OO
Oliver John O'sullivan
Rmo/Ceo/Pres