Updated: Apr 05, 2026
Location and Projects
Address
4945 GRANGE RD, Santa Rosa, CA, 95404
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Quantum Mechanical of Sonoma County Inc
Quantum Mechanical of Sonoma County Inc, 4945 Grange Rd, Santa Rosa, CA (Employee: Gregory Scott Quackenbush) holds a General Building, Fire Protection, Plumbing license according to the California license board.
Their BuildZoom score of 92 ranks in the top 32% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Quantum Mechanical of Sonoma County Inc, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Quantum Mechanical of Sonoma County Inc Services
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Quantum Mechanical of Sonoma County Inc Contact Information
Phone Number: (707) 479-6950
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Address: 4945 GRANGE RD, Santa Rosa, CA 95404
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Building Permits by Quantum Mechanical of Sonoma County Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
Garage add'n of rv garage - 54 x 14
Valuation:
N/A
Permit #:
BLD16-4162
Status:
final
Fee:
$2,044
Permit Type:
N/A
Building Type:
N/A
Law library tenant improvement. 8/27/10 applied for temp occ
Valuation:
N/A
Permit #:
BLD09-4877
Status:
complete
Fee:
$15,408
Permit Type:
N/A
Building Type:
N/A
Install office trailer 720 sq ft. 6-17-2010 temp occ applied for on this date
Valuation:
N/A
Permit #:
BLD10-1879
Status:
expired
Fee:
$768
Permit Type:
N/A
Building Type:
N/A
Install security system @ airport - install card readers @ various gates - install 7 camera masts
Valuation:
N/A
Permit #:
BLD11-0449
Status:
final
Fee:
$2,856
Permit Type:
N/A
Building Type:
N/A
Replace emergency generator and transfer switch for emergency operations ctr
Valuation:
N/A
Permit #:
BLD11-3616
Status:
expired
Fee:
$136
Permit Type:
N/A
Building Type:
N/A
Overlay one layer 120 squares single ply class a roofing system sierra building
Valuation:
N/A
Permit #:
BLD06-4857
Status:
final
Fee:
$19
Permit Type:
N/A
Building Type:
N/A
Annual maintenence permit for juv justice ctr
Valuation:
N/A
Permit #:
BLD08-4947
Status:
expired
Fee:
$2
Permit Type:
N/A
Building Type:
N/A
Annual maintenence permit sierra youth center
Valuation:
N/A
Permit #:
BLD08-4946
Status:
expired
Fee:
$2
Permit Type:
N/A
Building Type:
N/A
Relocate gas meter
Valuation:
N/A
Permit #:
BLD10-2106
Status:
expired
Fee:
$70
Permit Type:
N/A
Building Type:
N/A
Library remodel ada upgrade to restrooms
Valuation:
N/A
Permit #:
BLD07-0430
Status:
final
Fee:
$26
Permit Type:
N/A
Building Type:
N/A
Zone c- ada transition plan- public right of way improvements
Valuation:
N/A
Permit #:
BLD10-2485
Status:
final
Fee:
$600
Permit Type:
N/A
Building Type:
N/A
Annual maintenence permit
Valuation:
N/A
Permit #:
BLD08-4948
Status:
expired
Fee:
$2
Permit Type:
N/A
Building Type:
N/A
Zone d- transition plan- public right of way improvements
Valuation:
N/A
Permit #:
BLD10-2486
Status:
final
Fee:
$601
Permit Type:
N/A
Building Type:
N/A
Zone d- transition plan- public right of way improvements
Valuation:
N/A
Permit #:
BLD10-2487
Status:
final
Fee:
$600
Permit Type:
N/A
Building Type:
N/A
Replace existing 2 doors & windows with new metal systems
Valuation:
N/A
Permit #:
BLD07-1060
Status:
final
Fee:
$9
Permit Type:
N/A
Building Type:
N/A
Tear-off and replace with class a asphalt shingle 240 squares vets hall
Valuation:
N/A
Permit #:
BLD07-2957
Status:
final
Fee:
$42
Permit Type:
N/A
Building Type:
N/A
Assessors office: tenant improvmnt
Valuation:
N/A
Permit #:
BLD10-2626
Status:
final
Fee:
$835
Permit Type:
N/A
Building Type:
N/A
Convert conf room d to lafco office conduit in the 2 walls
Valuation:
N/A
Permit #:
BLD06-3788
Status:
expired
Fee:
$5
Permit Type:
N/A
Building Type:
N/A
To complete bld01-3852 issued for a 180 sf shed with electrical
Valuation:
N/A
Permit #:
BLD08-5387
Status:
final
Fee:
$156
Permit Type:
N/A
Building Type:
N/A
Remove temporary office trailer
Valuation:
N/A
Permit #:
DEM10-0080
Status:
expired
Fee:
$168
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Quantum Mechanical of Sonoma County Inc License info
Verified License
| License # | 731245 |
| Status | Active |
| State | California |
| Type | General Building, Fire Protection, Plumbing |
| Business Type | Corporation |
- BuildZoom verified this license was active as of April 2026.
Verify this license's status for Quantum Mechanical of Sonoma County Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
92
BuildZoom Score
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $25,000 |
17
Permits
- Building permit records show that Quantum Mechanical of Sonoma County Inc has worked on 17 permitted projects.
Quantum Mechanical of Sonoma County Inc Employees
GQ
Gregory Scott Quackenbush
Sole Owner