Location and Projects
Address
Torrance, CA, 90505
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Cornerstone Construction & Retrofitting Photos
Cornerstone Construction & Retrofitting Engineer
Cornerstone Construction & Retrofitting was founded in 1997 when it is owner realized the need for seismic upgrades on residential homes in order to protect them in the event of a large earthquake. Since it's inception Cornerstone Construction & Retrofitting has worked for the California Department of Insurance's earthquake grants and loan program and is on several earthquake insurance companies vendor list. If you’re still having doubts, then we recommend that you consult with one of our knowledgeable service representatives. They will answer any questions you may have about our efficient and expert service and help you realize that our company is pretty much the only choice you’ll ever need.
Residential earthquake retrofitting of homes and apartment buildings. Moment frame installation on soft story buildings as mandated by new L.A. City law.
From BuildZoom: Cornerstone Construction & Retrofitting, Torrance, CA (Owned by: Thomas Raymond Guadagno) holds a Roofing, General Building, Landscaping, Electrical, General Engineering license and 7 other licenses according to the California license board.
Their BuildZoom score of 61 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 Cornerstone Construction & Retrofitting, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Cornerstone Construction & Retrofitting Services
Start a project today:
Custom Home Build
New Home Construction
Medium Multi-Family New Con...
Other Residential New Const...
Multi-Room Remodel
Kitchen Remodel
Bathroom Remodel
Basement Remodel
Medium Multi-Family Remodel...
Other Residential Remodel
Office Renovation
Restaurant Renovation
Retail Renovation
Other Commercial Renovation
Roofing
Framing
Wood Fences
Backsplash and Countertops
Stonework
Tile Flooring
Other Stone and Tile
Drywall
Interior Plaster
Brick and Blockwork
Other Masonry
Flatwork Concrete
Foundations
Other Concrete
Demolition
Paving, Driveways, and Side...
Excavation and Grading
Other Site Work
Garage Construction
Skylights
Small Multi-Family New Cons...
Cornerstone Construction & Retrofitting Torrance
Quality
61
1st percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Construction & Retrofitting has a BuildZoom score of 61, which places them above 1% of all contractors in the United States.
Activity
|
7 projects
|
2025 |
|
5 projects
|
2024 |
|
6 projects
|
2023 |
Our building permit records indicate that Cornerstone Construction & Retrofitting has worked on at least
18.0 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.
Pricing
|
10 projects
|
$5k-$20k |
|
1 project
|
$20k-$50k |
|
1 project
|
$50k-$100k |
|
1 project
|
$100k-$250k |
The typical size of their permits is approximately $15,000. 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 Cornerstone Construction & Retrofitting
This is a sample of this contractor's permits. Click here to access their complete permit history.
Tear off (e) modified bitumen. no new sheathing. (n) certainteed flintlastic sa cap bitumen. total of 40 squares. ***flat pitch; missing crrc # **** ***manufacturer’s installation spec sheets to be onsite *** ***cool roof compliance is required in climate zone 6 for roof slopes less than 2:12***
Valuation:
N/A
Permit #:
B2025-001268
Status:
issued
Fee:
$622
Permit Type:
N/A
Building Type:
N/A
Tear off (e) shingle. (n) sheathing as needed. (n) 1 layer of synthetic underlayment. (n) owens corning comparable shingle. total of 35 squares. slope 4:12. ***manufacturer’s installation spec sheets to be onsite ***
Valuation:
N/A
Permit #:
B2025-006394
Status:
issued
Fee:
$627
Permit Type:
N/A
Building Type:
N/A
Construct 4-bedroom 2 455 sq ft single family residence with 815 sq ft attached garage and 958 sq ft p/p with roof mount solar
Valuation:
$170,264
Permit #:
K202500323
Status:
filed
Fee:
$1,807
Permit Type:
N/A
Building Type:
N/A
Reroof: remove and install (30) sq of composition shingles over the house and attached garage
Valuation:
$16,000
Permit #:
BLD2025-01289
Status:
final
Fee:
N/A
Permit Type:
Reroof
Building Type:
N/A
Remove existing roofing material. replace wood and/or resheath as needed. reroof residential apartments 628 630 632 & 634 w. vesta (2 200 sf) using crrc # 0890-0009 - ownes corning - amber
Valuation:
$13,000
Permit #:
B202402091
Status:
final
Fee:
$249
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material. replace wood and/or resheath as needed. reroof residential apartments (3 000 sf) using crrc # 0890-0009 - owens corning - amber
Valuation:
$18,000
Permit #:
B202402090
Status:
final
Fee:
$320
Permit Type:
N/A
Building Type:
N/A
(e-plan) pool bathroom addition and attached trellis over pool to (e) single family residence refer to bs2200886 for approved plans
Valuation:
$100,000
Permit #:
BS2202684
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Single family res...
Single family dwelling & attached garage. 4:12. 24 sq. tear off (e) comparable shingles. install (1) lyr synthetic underlayment & comparable shingles
Valuation:
$9,900
Permit #:
B23-00313
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
22 squares of comparable shingle tear off existing roof to sheathing use existing sheathing (replace as needed) apply 1 layer of synthetic underlayment slope 4:12
Valuation:
$3,695
Permit #:
BLDR-2021-0250
Status:
complete
Fee:
$287
Permit Type:
N/A
Building Type:
N/A
Slope stabilization w tecco mesh netting and soil nails into bedrock per soils engineer recommedation
Valuation:
$60,000
Permit #:
23020-10000-00741
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Tear off the existing asphalt shingles and install new composite shingles crrc#: 0890-0026 2300 sf
Valuation:
$13,000
Permit #:
BP-2022-20905
Status:
complete
Fee:
N/A
Permit Type:
Single family res...
Building Type:
N/A
No Description Available
Valuation:
$15,000
Permit #:
BLDR-2024-0912
Status:
complete
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Remove existing roofing material at apartment builiding 4800 sf and install comparable shingles crrc #0890-0009
Valuation:
$30,000
Permit #:
B202201994
Status:
issued
Fee:
$472
Permit Type:
N/A
Building Type:
N/A
Tear off (e) comparable shingles. new sheathing as needed. 1 layer synthetic underlayment. total 25 squares owens corning 30 yr comparable shingles crrc# 0890-0016 3:12 pitch. ***manufacturer's installation specs to be onsite for inspection***
Valuation:
N/A
Permit #:
B2023-004203
Status:
final
Fee:
$490
Permit Type:
N/A
Building Type:
N/A
Re-frame (e) roof tower domer (reduce 6'-00 height). voluntary upgrade to addition plywood and anchor bolt as per engineer of record. remove non- bearing wall beween (e) kitchen and remodel (e) kitchen replace cabinets and sink same location. replace (e) window (reduced in size) at living room
Valuation:
$17,000
Permit #:
13016-10000-17784
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Supplemental to 17014-10000-06553 revise foundation detail
Valuation:
$3,000
Permit #:
17014-10002-06553
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
New roof mounted photovoltaic solar panel modules 2.4kw
Valuation:
N/A
Permit #:
E2024-006200
Status:
final
Fee:
$450
Permit Type:
N/A
Building Type:
N/A
Residential and light commercial roof permit application
Valuation:
$28,000
Permit #:
RF-23-405
Status:
issued
Fee:
$585
Permit Type:
N/A
Building Type:
N/A
Replace 1 door(s) same size location number type. interior kitchen remodel/repair (no changes in walls or openings). interior bathroom remodel/repair (no changes in walls or openings)
Valuation:
$23,501
Permit #:
18016-90000-09934
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
(e-plan) pool remodel
Valuation:
$40,000
Permit #:
BS2200886
Status:
issued
Fee:
N/A
Permit Type:
N/A
Building Type:
Single family res...
Cornerstone Construction & Retrofitting Reviews
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Verified License
BuildZoom confirmed this contractor's license
Cornerstone Construction & Retrofitting License info
Verified License
| License # | 1092069 |
| Status | Active |
| State | California |
| Type | Roofing, General Building, Landscaping, Electrical, General Engineering |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of May 2026.
Verify this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 919784 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of July 2026.
Verify this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 867764 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | 919784 |
| Status | Active |
| State | California |
| Type | General Building |
| Class | B |
| Business Type | Sole Ownership |
- BuildZoom has not verified this license since May, 2025.
Verify this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1114461 |
| Status | Inactive |
| State | California |
| Type | General Landscaping license |
| Class | C-27 |
| 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.
Check this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 1114461 |
| Status | Inactive |
| State | California |
| Type | General Building, Landscaping |
| 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.
Check this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 755832 |
| Status | Inactive |
| State | California |
| Type | General Building |
| 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.
Check this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 573965 |
| Status | Inactive |
| State | California |
| Type | General Building |
| 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.
Check this license's status for Cornerstone Construction & Retrofitting at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
61
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
122
Permits
- Building permit records show that Cornerstone Construction & Retrofitting has worked on 122 permitted projects.
Cornerstone Construction & Retrofitting Employees
TY
Thomas Henry Young
Sole Owner
TG
Thomas Raymond Guadagno
Owner