Updated: May 31, 2026
Location and Projects
Address
21001 SAN RAMON VALLEY BLVD UNIT A4309, San Ramon, CA, 94583
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J J General Construction HVAC/Mechanical Contractor
J J General Construction Co, 21001 San Ramon Valley Blvd, San Ramon, CA (Employees: Jason Sangku Pak, John Sangjun Pak, and Jung Suk Pak) holds a General Building, Electrical license and 1 other license according to the California license board.
Their BuildZoom score of 111 ranks in the top 4% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring J J General Construction Co, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
J J General Construction Co Contact Information
Phone Number: (510) 364-1214
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Address: 21001 SAN RAMON VALLEY BLVD UNIT A4309, San Ramon, CA 94583
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J J General Construction Co San Ramon
Quality
111
96th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
J J General Construction Co has a BuildZoom score of 111, which places them above 96% of 336,931 contractors in California.
Activity
|
19 projects
|
2025 |
|
42 projects
|
2024 |
|
100 projects
|
2023 |
Our building permit records indicate that J J General Construction Co has worked on at least
161.0 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
|
7 projects
|
Home Additions |
|
4 projects
|
New Constructions |
|
160 projects
|
HVAC projects |
|
55 projects
|
Mechanical projects |
Analyzing permits over the last 4 years shows that J J General Construction Co mostly works on
hvac project
and mechanical project
projects.
Pricing
|
78 projects
|
< $5k |
|
73 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
The typical size of their permits is approximately $4,832. 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 J J General Construction Co
This is a sample of this contractor's permits. Click here to access their complete permit history.
Replace hvac system with heat pump communicating system. jj will include an indoor air handler + 3 ton outdoor unit at backyard side of home + run a new line set and 240v electrical circuit through attic for out-door unit
Valuation:
$5,276
Permit #:
BLD2025-05809
Status:
complete
Fee:
$309
Permit Type:
N/A
Building Type:
N/A
Install 3 ton single stage 80% carrier furnace + coil inside closet and demolish existing furnace and coil. jj will include a 3 ton air conditioning condenser and re-use existing line set and 240v electrical circuit. replace plenum and install two filter grills for returns
Valuation:
$4,838
Permit #:
B24-1438
Status:
final
Fee:
$252
Permit Type:
N/A
Building Type:
N/A
Replace existing heat pump unit on side of the house. install new supply and return plenums supply ducts (14 vents) with manual dampers new return ducts (2 returns) and enlarge or addition another return to increase return air. **hers report may be required at final inspection**
Valuation:
N/A
Permit #:
BIM24-003368
Status:
expired
Fee:
$421
Permit Type:
N/A
Building Type:
N/A
Install (1) 3 ton furnace in attic with new coil and remove garage furnace to install a new coil for existing lennox furnace. install (1) 3 ton air conditioning unit(comfort series) re-use line set flush + re use electrical circuits
Valuation:
$7,151
Permit #:
B24-0785
Status:
final
Fee:
$252
Permit Type:
N/A
Building Type:
N/A
Remove and dispose of old equipment in backyard downstairs closet and attic upstairs. place 5 ton smart multi mitsubishi heat pump on pad in backyard. place upstairs air handler horizontal on stands and pan pipe drains out of attic or into closet through same chase as lineset
Valuation:
$9,865
Permit #:
B24-0333
Status:
final
Fee:
$378
Permit Type:
N/A
Building Type:
N/A
Removing the old furnace and duct work and putting in its place a mitsubishi heat pump with ducted air handler with 5 supply runs 1 return and 1 cut in the kitchen. as well as 1 single head 9k highwall mini split in the master bedroom. new 220v 30 amp circuit to me run from panel in basement
Valuation:
$7,641
Permit #:
BLD2024-04706
Status:
complete
Fee:
$307
Permit Type:
N/A
Building Type:
N/A
Install 2.5 ton single stage 80% furnace inside exterior closet and demolish existing furnace & coil. jj will include a 2.5 ton air conditioning condenser + re-use a line set and install line set cover and extend 240v electrical circuit with conduit to code compliant location for outdoor unit. modify plenum and addition filter box. re-use existing thermostat and wire run
Valuation:
$2,083
Permit #:
B24-3285
Status:
final
Fee:
$252
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing 3 ton and 3.5 ton systems with new lennox 3 ton 19 seer2 and a lennox 4 ton 18.4 seer2 heat pump and 65 stage 99% communicating furnaces to create dual fuel hybrid systems and will be replacing the 4 ton system ducting all 10 supply ducts to be replaced and the existing return increased or second return ran for 4 ton syste... see more
Valuation:
$16,478
Permit #:
B23-2410
Status:
final
Fee:
$725
Permit Type:
N/A
Building Type:
N/A
All existing equipment will be removed and the areas prepped for the new equipment. an all new refrigerant line will be ran through the crawlspace from the outdoor condenser to the new evaporator coil. the new furnace evaporator coil and filter box will all be located in the same area as the existing equipment. lennox 4 ton variable-capacity furnace 97.5% afue model #slp99df090xv48c e... see more
Valuation:
$15,098
Permit #:
B23-2405
Status:
issued
Fee:
$242
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing system with a new mitsubishi smart multi system with ducted and ductless indoor units downstairs indoor units break down: 2.5 ton ducted system air handler relocating new air handler in garage to where the washer and dryer are currently sitting. will replace the existing 5 supply ducts and cut in 2 new ducts and resize pro... see more
Valuation:
$17,051
Permit #:
B23-2207
Status:
final
Fee:
$121
Permit Type:
N/A
Building Type:
N/A
New gas furnace and evaporator coil. new heat pump condenser chx35-42b-6f coil/3.5 ton/cased horizontal 3.5 ton txv (r410a) lennox dlsc slp99v 2-3.5 ton variable-capacity furnace model # slp99uh070xv36b signature sl25xpv-036 series 3 ton variable capacity air conditioner **hers may be required**
Valuation:
$12,629
Permit #:
BIM23-007576
Status:
final
Fee:
$602
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing 2.5 ton ruud air conditioning and evaporator coil with a new lennox 65 stage 18.4 seer2 heat pump air conditioning and adp 17” evaporator coil and new lennox 2 stage communicating 80% gas furnace to create a dual fuel hybrid system. lennox elite el18xpv series 3 ton quantum coil variable capacity heat pump model #el18xpv-0... see more
Valuation:
$6,368
Permit #:
B23-2407
Status:
final
Fee:
$242
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing downflow furnace and air conditioning with a new lennox 2 stage 80% communicating downflow furnace and 18.2 seer 65 stage heat pump to create a dual fuel hybrid system lennox downflow evaporator m#: cr33-30/36a lennox dlsc sl280v 80% afue downflow gas furnace 66 000 btu sl280df070v36a lennox elite el18xpv series 3 ton quan... see more
Valuation:
$7,717
Permit #:
B23-2215
Status:
final
Fee:
$362
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing furnace and air conditioning with a new goodman 2 stage 80% furnace and 17.2 seer2 2 stage air conditioning and also replacing the zoning in home goodman 2 stage 17.2 seer2 air conditioning m#: gsxc704810 goodman 2 stage 80% gas furnace m#: gm9c800804cn 4 ton adp horizontal evap coil c48h175p156
Valuation:
$4,772
Permit #:
B23-2201
Status:
final
Fee:
$242
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing downflow gas furnace in laundry room with a new lennox slp99 variable stage modulating downflow furnace. will remove outside air conditioning condensing unit and replace with a lennox ml18xcv 18 seer 65 stage air conditioning condenser
Valuation:
$10,192
Permit #:
B23-2147
Status:
final
Fee:
$242
Permit Type:
N/A
Building Type:
N/A
Replacing the existing 5 ton gas furnace and 4 ton air conditioning with a new lennox 5 ton 80% 2 stage communicating gas furnace and 5 ton 65 speed inverter 17.4 seer2 heat pump air conditioning and duct work ** hers report required at final**
Valuation:
$9,760
Permit #:
BIM23-007589
Status:
final
Fee:
$524
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing 10 supply ducts in home all supply ducts to be r-8 in value per ca zoning code and receive: manual adjustable dampers new boots and wye intersections proper sealing and insulation new supply plenum box
Valuation:
$1,900
Permit #:
B23-2426
Status:
final
Fee:
$121
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be installing a new mitsubishi m series 3 port heat pump mini split with 3 ceiling 1 way wall mounts for the upstairs of home. 0.75 ton mlz series 1-way cassette indoor unit mlz-kp09na-u1 1 ton mlz series 1-way cassette indoor unit 1tmlzs1wci 2.5 ton mxz series outdoor unit 2.5tmxzso **hers report may be required at final inspection**
Valuation:
$4,335
Permit #:
BIM23-007027
Status:
final
Fee:
$391
Permit Type:
N/A
Building Type:
N/A
Jj heating and air conditioning will be replacing the existing 3.5 ton furnace with a new daikin fit variable speed 16.8 seer2 heat pump all electric system 14 new supply cut ins for attic daikin daikin fit dz17vsa601ba split heat pump 17 seer & 8.7 hspf inverter 5 ton daikin dvfecd14 ducted multi-position air handler variable speed ecm motor 5 ton **hers report may be required at fin... see more
Valuation:
$4,656
Permit #:
BIM23-006961
Status:
final
Fee:
$395
Permit Type:
N/A
Building Type:
N/A
Residential hvac - heating ventilation air conditioning
2023-05-31
Permit deemed abandoned (r.§ 105.3.2) - jj heating and air conditioning will be installing a daikin 17 series mini split 9k btu wall mount system for shed. we will also be replacing all 11 duct runs in main home with new aluminum flex ducts. daikin 17 series outdoor mini-split heat pump 17 seer & hspf single zone
Valuation:
$2,532
Permit #:
M23-029525
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
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BZ Score
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Avg Project
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BZ Score
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BZ Score
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Verified License
BuildZoom confirmed this contractor's license
J J General Construction Co License info
Verified License
| License # | 972230 |
| Status | Active |
| State | California |
| Type | General Building, Electrical |
| Business Type | Corporation |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for J J General Construction Co at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1056813 |
| Status | Inactive |
| State | California |
| Type | Warm Air Heating, Ventilating And Air Conditioning |
| 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. If this is your business, please update your license status.
Check this license's status for J J General Construction Co at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
111
BuildZoom Score
Bonded
| Bonded Agent | Wesco Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
270
Permits
- Building permit records show that J J General Construction Co has worked on 270 permitted projects.
J J General Construction Co Employees
JP
Jason Sangku Pak
Officer
JP
John Sangjun Pak
Ceo / President
JP
Jung Suk Pak
Rmo
SL
Steve Hyun Lee
Rmo / Ceo / Pres
SL
Steve Lee
Ceo / President
SP
Sung Tae Pak
Officer