Updated: May 21, 2026
Location and Projects
Address
21274 RUNNING BRANCH RD, Diamond Bar, CA, 91765
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Diamond Roofing Systems Inc
Diamond Roofing Systems Inc at 21274 RUNNING BRANCH RD, Diamond Bar, CA 91765, held a Roofer license (#693092) with the California contractors license board with an expiration date of 02-11-2012. We last verified the license was inactive on 04-09-2026.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.
Diamond Roofing Systems Inc Contact Information
Phone Number: (909) 861-7663
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Address: 21274 RUNNING BRANCH RD, Diamond Bar, CA 91765
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Diamond Roofing Systems Inc Diamond Bar
Quality
Alert*
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
*No active license on file. If you are Diamond Roofing Systems Inc, click “This is My Business” to update your information.
Activity
|
3 projects
|
2024 |
|
2 projects
|
2023 |
Our building permit records indicate that Diamond Roofing Systems Inc has worked on at least
5.0 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
|
5 projects
|
Roofing projects |
Analyzing permits over the last 4 years shows that Diamond Roofing Systems Inc mostly works on
roofing project
projects.
Pricing
|
2 projects
|
$5k-$20k |
|
2 projects
|
$20k-$50k |
|
1 project
|
$50k-$100k |
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 Diamond Roofing Systems Inc
This is a sample of this contractor's permits. Click here to access their complete permit history.
30 squares of cool roof shingles (iko cambridge cool colors) - black tear off existing roof to sheathing use existing sheathing (replace if needed) apply one layer synthetic underlayment slope 4:12 crrc# 1214-0010 sri: 20
Valuation:
$5,039
Permit #:
BLDR-2024-0001
Status:
complete
Fee:
$430
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material. replace wood and/or resheath as needed. reroof building c - units 1 through 8 (4500 sf) using crrc # 0676-0131a
Valuation:
$20,250
Permit #:
B202302340
Status:
final
Fee:
$362
Permit Type:
N/A
Building Type:
N/A
Remove existing shingle roof & install cool roof shingle crrc 0890-0033 & install torch on flat roof
Valuation:
$12,000
Permit #:
B24-47003
Status:
final
Fee:
N/A
Permit Type:
Rr residential al...
Building Type:
N/A
Rapiscan: commercial reroof/tearoff existing and install white torchdown (crrc#: 0616-0011a) (upper roof only)
Valuation:
$52,000
Permit #:
BLD23-00127
Status:
complete
Fee:
$2,015
Permit Type:
N/A
Building Type:
N/A
Rapiscan: commercial reroof/tearoff existing and install white torchdown (crrc#: 0616-0011a) (side roof only)
Valuation:
$41,000
Permit #:
BLD23-01108
Status:
final
Fee:
$1,625
Permit Type:
N/A
Building Type:
N/A
Installation of new cool roof over (1) layer of existing roof(68)sq. crrc #1214-0006
Valuation:
N/A
Permit #:
210041
Status:
issued
Fee:
$1,094
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material replace wood as needed. reroof residential units 1 - 8 of building j (3800 sqft) using crrc # 1214-0012
Valuation:
$13,000
Permit #:
B202200926
Status:
final
Fee:
$274
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material replace wood as needed. reroof residential units 1 - 8 of building i (3800 sqft) using crrc # 1214-0012
Valuation:
$13,000
Permit #:
B202200925
Status:
final
Fee:
$249
Permit Type:
N/A
Building Type:
N/A
Replace fire damaged truss & rafters plywood & roof repair with a 3ply hot tar
Valuation:
$16,500
Permit #:
BR-2021-00249
Status:
final
Fee:
$541
Permit Type:
N/A
Building Type:
N/A
Remove existing shingles & install new cool roof shingles (g.a.f reflector crrc# 0676-0136
Valuation:
$11,000
Permit #:
B202103716
Status:
final
Fee:
$221
Permit Type:
N/A
Building Type:
N/A
Remove existing shingles & install new cool roof shingles (g.a.f) crrc# 0676-0136
Valuation:
$12,000
Permit #:
B202103715
Status:
final
Fee:
$235
Permit Type:
N/A
Building Type:
N/A
Reroof: remove existing material resheath as necessary and install (38) squares onto apartment building
Valuation:
$12,000
Permit #:
BLD2019-03578
Status:
final
Fee:
N/A
Permit Type:
Reroof
Building Type:
N/A
Tear off (e) hot mop bur new sheathing as needed install firestone gt torchdown bur 20 squares. entered by: bollsd
Valuation:
N/A
Permit #:
B2019-005171
Status:
final
Fee:
$207
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material. replace wood and/or resheath as needed. reroof building a - units 1 through 8 (4800 sf) using crrc # 0890-0031 - owens corning - cliffside gray
Valuation:
$21,600
Permit #:
B202302001
Status:
issued
Fee:
$377
Permit Type:
N/A
Building Type:
N/A
Tear off existing roofing install dens deck and 60 mil tpo. install new metal coping (cool roof) coping to blend into wall color
Valuation:
$42,000
Permit #:
BMN2014-00819
Status:
Issued
Fee:
N/A
Permit Type:
Roof
Building Type:
N/A
Remove existing roofing material on appartment complex building # f units 1-8 and re-roof using crrc # 0676-0130a (4 000 sf)
Valuation:
$6,000
Permit #:
B202004860
Status:
final
Fee:
$151
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material on appartment complex building #e units 1-8 and re-roof using crrc # 0676-0130a (4 000 sf)
Valuation:
$6,000
Permit #:
B202004859
Status:
final
Fee:
$151
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material on appartment complex building #b units 1-8 and re-roof using crrc # 0676-0130a (4 000 sf)
Valuation:
$6,000
Permit #:
B202004856
Status:
final
Fee:
$151
Permit Type:
N/A
Building Type:
N/A
Remove exissting roofing material on appartment complex unit #d units 1-8 and re-roof using crrc # 0676-0130a (4 000 sf)
Valuation:
$6,000
Permit #:
B202004858
Status:
final
Fee:
$151
Permit Type:
N/A
Building Type:
N/A
Reroof: remove existing material resheath as needed and install 69 squares of shingles over apartment building
Valuation:
$12,000
Permit #:
BLD2019-03338
Status:
final
Fee:
N/A
Permit Type:
Reroof
Building Type:
N/A
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Diamond Roofing Systems Inc Reviews
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Diamond Roofing Systems Inc License info
Inactive License
| License # | 693092 |
| Status | Inactive |
| State | California |
| Type | Roofing |
| 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 Diamond Roofing Systems Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 971008 |
| Status | Inactive |
| State | California |
| Type | Roofing, General Building |
| 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 Diamond Roofing Systems Inc at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
- How the BuildZoom Score works
- *No active license on file. If you are Diamond Roofing Systems Inc, click “This is My Business” to update your information.
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $25,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
62
Permits
- Building permit records show that Diamond Roofing Systems Inc has worked on 62 permitted projects.
Diamond Roofing Systems Inc Employees
JK
Jay Ho Kim
Sole Owner