Updated: Mar 18, 2026
Location and Projects
Address
1142 S DIAMOND BL #169, Diamond Bar, CA, 91765
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Cal Steam Company Plumber
Cal Steam Company, 1142 S Diamond Blvd, Diamond Bar, CA (Owned by: Johnny Unhyong Kim) holds a Boiler, Hot Water Heating And Steam Fitting, Warm Air Heating, Ventilating And Air Conditioning, Plumbing license according to the California license board.
Their BuildZoom score of 102 ranks in the top 11% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Cal Steam Company, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Cal Steam Company Services
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Cal Steam Company Contact Information
Phone Number: (213) 798-4693
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Address: 1142 S DIAMOND BL #169, Diamond Bar, CA 91765
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Cal Steam Company Diamond Bar
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cal Steam Company has a BuildZoom score of 102, which places them above 89% of 336,931 contractors in California.
Activity
|
1 project
|
2025 |
|
2 projects
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Cal Steam Company has worked on at least
4.0 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
|
4 projects
|
Plumbing projects |
Analyzing permits over the last 4 years shows that Cal Steam Company mostly works on
plumbing project
projects.
Pricing
|
1 project
|
< $5k |
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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Revision to remove scope to replace (3) water heaters remove slab cut for (n) boiler pad and redesign pad for boiler ref: plmc-2022-0117 as per approved plans
Valuation:
N/A
Permit #:
MIS-2023-0159
Status:
complete
Fee:
$300
Permit Type:
N/A
Building Type:
N/A
Supplemental to permit# 24044-90000-07895 addition vents to existing permit
Valuation:
N/A
Permit #:
24044-30001-07895
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace boiler. structural plan check is required for new or replaced equipment weighing 400 lbs. or more when supported by a building and in case of a replacement the new equipment exceeds the weight of the old one. lamc section 91.1632
Valuation:
N/A
Permit #:
06045-10000-00427
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install gas line/water heater
Valuation:
$2,000
Permit #:
COM-PLB-25-023
Status:
complete
Fee:
$188
Permit Type:
New
Building Type:
N/A
Hvac duct and vents to existing havc unit
Valuation:
N/A
Permit #:
24044-90000-07895
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Rite steam boiler installation
Valuation:
N/A
Permit #:
22045-90000-00244
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Rite boiler vent install
Valuation:
N/A
Permit #:
22044-90000-11473
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Floor drain water heater sinks
Valuation:
N/A
Permit #:
21042-90000-02076
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Plumbing sewage and grease
Valuation:
N/A
Permit #:
24042-90000-01326
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install 2 electric steam boilers
Valuation:
N/A
Permit #:
23045-90000-00501
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Boiler vent install
Valuation:
N/A
Permit #:
20044-90000-08733
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace steam boiler
Valuation:
N/A
Permit #:
20045-90000-00217
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install a new low pressure gas line
Valuation:
N/A
Permit #:
18042-90000-01393
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace steam boiler
Valuation:
N/A
Permit #:
18045-90000-00027
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install boiler vent
Valuation:
N/A
Permit #:
18044-90000-01208
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install (1) boiler vent. structural plan check is required for new or replaced equipment weighing 400 lbs. or more when supported by a building and in case of a replacement the new equipment exceeds the weight of the old one. lamc section 91.1632
Valuation:
N/A
Permit #:
06044-10000-11482
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Install (1) boiler. structural plan check is required for new or replaced equipment weighing 400 lbs. or more when supported by a building and in case of a replacement the new equipment exceeds the weight of the old one. lamc section 91.1632
Valuation:
N/A
Permit #:
06045-10000-00490
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace boiler. structural plan check is required for new or replaced equipment weighing 400 lbs. or more when supported by a building and in case of a replacement the new equipment exceeds the weight of the old one. lamc section 91.1632
Valuation:
N/A
Permit #:
06045-10000-00426
Status:
final
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Replace boiler. structural plan check is required for new or replaced equipment weighing 400 lbs. or more when supported by a building and in case of a replacement the new equipment exceeds the weight of the old one. lamc section 91.1632
Valuation:
N/A
Permit #:
06045-10000-00428
Status:
issued
Fee:
N/A
Permit Type:
Commercial
Building Type:
N/A
Cal steam - for the annual fire permit and inspection for the period of january 2015 to january 2016
Valuation:
$0
Permit #:
FIRE-2015-00012
Status:
final
Fee:
$280
Permit Type:
N/A
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Cal Steam Company License info
Verified License
| License # | 674646 |
| Status | Active |
| State | California |
| Type | Boiler, Hot Water Heating And Steam Fitting, Warm Air Heating, Ventilating And Air Conditioning, Plumbing |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of March 2026.
Verify this license's status for Cal Steam Company at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
Bonded
| Bonded Agent | Western Surety Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Sentry Insurance A Mutual Company |
60
Permits
- Building permit records show that Cal Steam Company has worked on 60 permitted projects.
Cal Steam Company Employees
JK
Johnny Unhyong Kim
Owner
I find CAL SDM, is a very honesty business, J.Kim is a strong Christian man who is taken advantage of by others. Mr Kim tries his level best to satisfy his customers by providing quality goods and fair prices.
People think they are living in the 1940s and that he should ave prices from that era, reallity is it is 2011 and the economy isn't getting better, but business must keep going and it seems that people want something for nothing. Mr. Kim tries to help as much as the economy allows.
Thank you (Mr. Kim)
Rev. Dr. John J. Goodson
Chorch Of Our Lord (COOL)