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Updated: May 10, 2026
Location and Projects
Address
3450 3RD STREET UNIT 4D, San Francisco, CA, 94124
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Fontenoy Engineering Photos
Fontenoy Engineering
Fontenoy Engineering is a San Francisco-based General Engineering Contractor specializing in underground utility construction across the Greater Bay Area.
Established in 2012, Fontenoy Engineering has 40 years of combined leadership experience and has completed more than 200 public works contracts.
Fontenoy Engineering delivers safe, cost-effective, and technically precise solutions for complex infrastructure projects, continuing to be a trusted partner for Public Works contracts and seeking quality infrastructure solutions that meet the unique demands of the Bay Area.
From BuildZoom: Fontenoy Engineering, 3450-3 Rd St, San Francisco, CA (Employees: Aidan John O Sullivan and Sean Padraig Burke) holds a General Engineering, Construction Zone Traffic Control, Landscaping license and 1 other license according to the California license board.
Their BuildZoom score of 98 ranks in the top 16% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Fontenoy Engineering, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Fontenoy Engineering Services
Start a project today:
Medium Multi-Family Remodel...
Office Renovation
Restaurant Renovation
Retail Renovation
Other Commercial Renovation
Flatwork Concrete
Foundations
Other Concrete
Demolition
Paving, Driveways, and Side...
Excavation and Grading
Other Site Work
Seismic Retrofit
Sea Walls
Drafting
Industrial Renovation
Hotel Renovation
Warehouse Renovation
Large Multi-Family Remodel ...
Healthcare Facility Renovation
Fontenoy Engineering Contact Information
Phone Number: (415) 559-4097
Address: 3450 3RD STREET UNIT 4D, San Francisco, CA 94124
This is a sample of this contractor's permits. Click here to access their complete permit history.
Underground electrical
Valuation:
$10,000
Permit #:
DPW-000852
Status:
issued
Fee:
$400
Permit Type:
N/A
Building Type:
N/A
Plumbing repair/replace building sewer on property only. sl & x required beyond pl. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
SL1303174
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repair/replace building sewer on property only. sl & x required beyond pl. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
SL1303174
Status:
issued
Fee:
$407
Permit Type:
N/A
Building Type:
N/A
Repair/replace sewer lateral and excavate in public right-of-way. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
X1302639
Status:
issued
Fee:
$436
Permit Type:
N/A
Building Type:
N/A
Repair/replace sewer lateral and excavate in public right-of-way. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
SL1303175
Status:
issued
Fee:
$407
Permit Type:
N/A
Building Type:
N/A
Installatin of new storm drain catch basin. installation of new irrigation system
Valuation:
N/A
Permit #:
PP20160817144
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repair/replace sewer lateral and excavate in public right-of-way. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
X1302639
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Repair/replace sewer lateral and excavate in public right-of-way. overflow device may be needed. call pwa inspection prior to start: 510-238-3651. 4th floor
Valuation:
N/A
Permit #:
SL1303175
Status:
PERMIT ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of underground utilities - sewer in addition to pp20160205714
Valuation:
N/A
Permit #:
PP20160223165
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Location: in front of 1298 potrero avenue: install services (electrical sewer water) to prefabricated sfmta restroom facility
Valuation:
$0
Permit #:
E201410013214
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Location: in front of 4101 third street: install services (electrical sewer water) to prefabricated sfmta restroom facility
Valuation:
$0
Permit #:
E201410013213
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installing pipes for irrigation system
Valuation:
$0
Permit #:
PP20151023018
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installing underground conduits for lighting (7 lights)
Valuation:
N/A
Permit #:
E201510232476
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of undeground utilities- water gas
Valuation:
N/A
Permit #:
PP20160205714
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installing pipes for irrigation system
Valuation:
N/A
Permit #:
PP20151023018
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Storm line and manhole installtion sewer line connection
Valuation:
N/A
Permit #:
PP20190820654
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installation of egro utilities- water gas
Valuation:
$0
Permit #:
PP20160205714
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Water and sewer service lines for area designated for food truck come and go
Valuation:
N/A
Permit #:
PP20180411446
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Install underground fire service and storm drain
Valuation:
N/A
Permit #:
PP20180307458
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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Fontenoy Engineering License info
Verified License
| License # | 981726 |
| Status | Active |
| State | California |
| Type | General Engineering, Construction Zone Traffic Control, Landscaping |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Fontenoy Engineering at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 980640 |
| Status | Inactive |
| State | California |
| Type | General Engineering |
| Business Type | Corporation |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed.
Check this license's status for Fontenoy Engineering at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
98
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Hartford Insurance Company Of The Midwest |
9
Permits
- Building permit records show that Fontenoy Engineering has worked on 9 permitted projects.
Fontenoy Engineering Employees
AS
Aidan John O Sullivan
Rmo / Ceo / Pres
SB
Sean Padraig Burke
Officer