Updated: May 20, 2026
Location and Projects
Address
P O BOX 4275, Riverside, CA, 92514
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William Brennan HVAC/Mechanical Contractor
William Brennan Inc, Riverside, Po Box 4275, Riverside, CA (Employees: Sheila Dianne Brennan and William Patrick Brennan) holds a Warm Air Heating, Ventilating And Air Conditioning license according to the California license board.
Their BuildZoom score of 83 does not rank in the top 50% of California contractors.
Their license was verified as active when we last checked. If you are thinking of hiring William Brennan Inc, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William Brennan Inc Contact Information
Phone Number: (951) 780-4313
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Address: P O BOX 4275, Riverside, CA 92514
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Change out of 5 ton heating and cooling system
Valuation:
N/A
Permit #:
21044-90000-25560
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Installation of rooftop platforms for mechanical equipment: 5 hvac units [4- max 750# and one- max 550#] reinforce roof framing for added loads
Valuation:
$10,000
Permit #:
21016-10000-14259
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Supplemental permit to = 06044*70m*06492 for fire dampers bathroom & dryer vents. in addition to = install new hvac system for (roof top units) = new 3-story type v-n building with one unit artist-in-resident and retail space
Valuation:
N/A
Permit #:
06044-70001-06492
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
(1) circuit
Valuation:
N/A
Permit #:
70016-0273
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New hvac = install new hvac system for (roof top units) = new 3-story type v-n building with one unit artist-in-resident and retail space
Valuation:
N/A
Permit #:
06044-70000-06492
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Install new fau in attic and air conditioning condenser at side yard
Valuation:
N/A
Permit #:
MEC17-00181
Status:
complete
Fee:
$143
Permit Type:
N/A
Building Type:
N/A
Install new fau in attic and air conditioning condenser at side yard
Valuation:
N/A
Permit #:
ELE17-00271
Status:
final
Fee:
$85
Permit Type:
N/A
Building Type:
N/A
C/o (4)ton package unit system btu 90k
Valuation:
$5,000
Permit #:
2013BD0159
Status:
FINAL
Fee:
$206
Permit Type:
Residence
Building Type:
N/A
Hvac changeout single family dwelling
Valuation:
$0
Permit #:
BME130642
Status:
FINAL
Fee:
$193
Permit Type:
N/A
Building Type:
N/A
Changeout wall heater. same location (hallwy)
Valuation:
N/A
Permit #:
B201604010
Status:
final
Fee:
$48
Permit Type:
N/A
Building Type:
N/A
Installation of hvac system screen from street - duct testing required
Valuation:
N/A
Permit #:
MEC2006-00907
Status:
final
Fee:
N/A
Permit Type:
Mechanical permit
Building Type:
N/A
Install air conditioning and heating package unit with gas line
Valuation:
N/A
Permit #:
07044-70000-01792
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
1 fau 1 appliance 8 registers 1 boiler/compressor 1 gas outlet
Valuation:
$0
Permit #:
73642
Status:
FINAL
Fee:
$411
Permit Type:
N/A
Building Type:
N/A
Change out horizontal fau and duck work
Valuation:
N/A
Permit #:
10044-70000-08094
Status:
applied
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Change out 4-ton heat/cool system horizontal for the house
Valuation:
N/A
Permit #:
05044-70000-08300
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Ti- rework ductwork for 2 systems. jamba juice
Valuation:
N/A
Permit #:
98044-20000-04799
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Change out f.a.u.-a/c central system in attic. replace ducts
Valuation:
N/A
Permit #:
03044-30000-04736
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Change out htng cool system & addition air conditioning unit to the house
Valuation:
N/A
Permit #:
05044-70000-09412
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Change out (e) hvac sytem. (work is for for 2528 military)
Valuation:
N/A
Permit #:
06044-70000-08879
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Supplemental permit to addition gas for pre-fab fireplace
Valuation:
N/A
Permit #:
08044-70001-02813
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
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William Brennan Inc Reviews
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Verified License
BuildZoom confirmed this contractor's license
William Brennan Inc License info
Verified License
| License # | 611160 |
| Status | Active |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning |
| Business Type | Corporation |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for William Brennan Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
83
BuildZoom Score
Bonded
| Bonded Agent | American Contractors Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Clear Spring Property & Casualty Company |
77
Permits
- Building permit records show that William Brennan Inc has worked on 77 permitted projects.
William Brennan Inc Employees
SB
Sheila Dianne Brennan
Officer
WB
William Patrick Brennan
Sole Owner