Updated: Jul 14, 2026
Location and Projects
Address
729 FULTON SHIPYARD RD #B1, Antioch, CA, 94509
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DIABLO BOILER HVAC/Mechanical Contractor
DIABLO BOILER, 729 Fulton Shipyard Rd, Antioch, CA (Owned by: Timothy Jay Clay) holds a Boiler, Hot Water Heating And Steam Fitting license and 1 other license according to the California license board.
Their BuildZoom score of 93 ranks in the top 27% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring DIABLO BOILER, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
DIABLO BOILER Contact Information
Phone Number: (925) 776-5089
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Address: 729 FULTON SHIPYARD RD #B1, Antioch, CA 94509
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This is a sample of this contractor's permits. Click here to access their complete permit history.
Work category: 8p; installing a like for like unit
Valuation:
N/A
Permit #:
PW20181018361
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Water heater replacement(perform on an emergency basis). water heater removal and install (1) commercial gas water heater model bth 199
Valuation:
$0
Permit #:
PP20141215503
Status:
ISSUED
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Water heater replacement(perform on an emergency basis). water heater removal and install (1) commercial gas water heater model bth 199
Valuation:
N/A
Permit #:
PP20141215503
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 8p; installing a raypak hi-delta pool boiler
Valuation:
N/A
Permit #:
PW20170918010
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Work category: 8p; installing a new raypak boiler
Valuation:
N/A
Permit #:
PW20170424662
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
(m) - mechanical - 3+ residential units or commercial (building)
2014-12-17
Replace existing boiler(greater than 30hp)
Valuation:
N/A
Permit #:
M1400526
Status:
final
Fee:
$242
Permit Type:
N/A
Building Type:
N/A
Addition nat gas pipe for steam generator to commercial building
Valuation:
N/A
Permit #:
BP-0603270
Status:
final
Fee:
$60
Permit Type:
N/A
Building Type:
N/A
Gas line for temporary propane tank
Valuation:
$5,300
Permit #:
343030
Status:
issued
Fee:
$162
Permit Type:
N/A
Building Type:
N/A
Steam heating boiler and dometic hot water heater with 119 gallon storage tank
Valuation:
N/A
Permit #:
429085
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Replace existing 166, 000 btu low presusre steam heating boiler
Valuation:
N/A
Permit #:
437020
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
New domestic hot water boiler - amendment to permit no. 429085
Valuation:
N/A
Permit #:
433337
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Run gas line
Valuation:
N/A
Permit #:
P9500302
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
2 boilers
Valuation:
$0
Permit #:
M0700064
Status:
Final
Fee:
$350
Permit Type:
N/A
Building Type:
N/A
Run gas line
Valuation:
$0
Permit #:
P9500302
Status:
Final
Fee:
$42
Permit Type:
N/A
Building Type:
N/A
2 boilers
Valuation:
N/A
Permit #:
M0700064
Status:
FINAL
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
2 boilers
Valuation:
N/A
Permit #:
M0700064
Status:
final
Fee:
$350
Permit Type:
N/A
Building Type:
N/A
Work category: 1m; removing existing cast iron sectional low pressure steam boiler used for building radiant heat and replacing it with updated replacement of a cast iron sectional steam boiler for building radiant heat
Valuation:
N/A
Permit #:
PMW20251212233
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Boiler flue piping will be extended to the roof top
Valuation:
N/A
Permit #:
B2019-03660
Status:
canceled
Fee:
$7,667
Permit Type:
Alteration
Building Type:
N/A
Gas piping condensation drain line and flue pipe
Valuation:
$6,500
Permit #:
B02-1301
Status:
expired
Fee:
$65
Permit Type:
plumbing
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
DIABLO BOILER License info
Verified License
| License # | 530963 |
| Status | Active |
| State | California |
| Type | Boiler, Hot Water Heating And Steam Fitting |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for DIABLO BOILER at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 482642 |
| Status | Inactive |
| State | California |
| Type | Boiler, Hot Water Heating And Steam Fitting |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for DIABLO BOILER at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
12
Permits
- Building permit records show that DIABLO BOILER has worked on 12 permitted projects.
DIABLO BOILER Employees
EJ
Ernest Ray Clay Jr
Qualify Partner
TC
Timothy Jay Clay
Owner