Updated: Jan 30, 2026
Location and Projects
Address
4910 MT ROYAL DRIVE, Los Angeles, CA, 90041
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Cornerstone Construction and Design
Based in Los Angeles, Cornerstone Construction and Design has operated for over two decades, focusing on residential remodeling and new home construction. The company serves neighborhoods throughout the greater Los Angeles area, completing a range of projects that include modern kitchen remodels, bathroom renovations, room additions, and custom home builds. Cornerstone Construction and Design’s portfolio features work on single-family homes and multi-unit properties, highlighting expertise in both interior and exterior transformations. The team manages all phases of construction, from initial design through final build, and often works directly with homeowners and property managers. Project examples include open-concept living areas, structural additions, updated facades, and complete property renovations tailored to meet the unique needs of Los Angeles clients.
Cornerstone Construction and Design Services
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Cornerstone Construction and Design Contact Information
Phone Number: (941) 702-3104
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Address: 4910 MT ROYAL DRIVE, Los Angeles, CA 90041
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Cornerstone Construction and Design Los Angeles
Quality
110
96th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Cornerstone Construction and Design has a BuildZoom score of 110, which places them above 96% of 336,931 contractors in California.
Activity
|
15 projects
|
2025 |
|
15 projects
|
2024 |
|
13 projects
|
2023 |
Our building permit records indicate that Cornerstone Construction and Design has worked on at least
43.0 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
|
11 projects
|
Home Additions |
|
3 projects
|
New Constructions |
|
6 projects
|
Kitchen remodels |
|
5 projects
|
Multi-room remodels |
Analyzing permits over the last 4 years shows that Cornerstone Construction and Design mostly works on
home addition
and kitchen remodel
projects.
Pricing
|
12 projects
|
< $5k |
|
9 projects
|
$5k-$20k |
|
6 projects
|
$20k-$50k |
|
4 projects
|
$50k-$100k |
|
4 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $8,750. 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 and Design
This is a sample of this contractor's permits. Click here to access their complete permit history.
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$6,000
Permit #:
25016-90000-15702
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Water damage termite damage dry rot repair less than 10% of replacement cost of residential buildings. application of an approved coating to an existing exterior balcony or deck
Valuation:
$5,500
Permit #:
25016-90000-10207
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Water damage termite damage dry rot repair less than 10% of replacement cost of residential buildings. application of an approved coating to an existing exterior balcony or deck
Valuation:
$5,500
Permit #:
25016-90000-10201
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Water damage termite damage dry rot repair less than 10% of replacement cost of residential buildings. application of an approved coating to an existing exterior balcony or deck
Valuation:
$5,500
Permit #:
25016-90000-10189
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Water damage termite damage dry rot repair less than 10% of replacement cost of residential buildings. application of an approved coating to an existing exterior balcony or deck
Valuation:
$5,500
Permit #:
25016-90000-10204
Status:
final
Fee:
N/A
Permit Type:
Apartment
Building Type:
N/A
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$7,500
Permit #:
24016-90000-36869
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$7,500
Permit #:
24016-90000-30136
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$4,700
Permit #:
24016-90000-27346
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$4,284
Permit #:
24016-90000-04681
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Single family residence - interior remodel 1068 sf & addition 584 sf city standard drainage
Valuation:
$425,000
Permit #:
XR2024-0195
Status:
final
Fee:
$14,025
Permit Type:
N/A
Building Type:
N/A
Partial remodel to single family dwelling work to include remodel kitchen and enclose an existing permitted 40 sqft covered porch. replacement of existing basement stairs with new spiral staircase. relocate laundry room to existing basement. new bathroom at basement level
Valuation:
$20,000
Permit #:
21016-10000-59340
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Addition sill plate anchor bolts and plywood to cripple walls (if existing) per la city standard plan #1; no foundation replacement (earthquake hazard reduction per chapter 92 of the los angeles building code). (houses residential buildings up to 3 stories and up to 4 units)
Valuation:
$6,000
Permit #:
23016-10000-15073
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Install new sub panel for adu to connect with new 3 gang meter. service located at 1603 isabel st. servicing 1603 isabel st. 1601 isabel st. and 1602 kemper st. ref.#23041-10000-07857 and 23041-10000-07858
Valuation:
N/A
Permit #:
23041-10000-07842
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Concrete block freestanding masonry fence walls constructed per information bulletin p/bc 2020-096 located in residential zones maximum 6 feet height above grade and not located in the required front yard or within 5 feet of the side street lot line of a reverse corner lot (subject to additional limitations of lamc section 12.22c20(f) and information bulletin p/zc 2002-002)
Valuation:
$15,000
Permit #:
22016-90000-32480
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Supplemental permit to permit #22041-10000-55519 to: change the address from 1309 1/2 w hepner ave to 1309 w hepner ave and correct the work description to read two gang meter servicing addresses 1309 and 1309 1/2 w hepner ave -- ref. permit #22041-10000-61225
Valuation:
N/A
Permit #:
22041-10001-55519
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
**no fee department error** supplemental to permit 20014-10000-02443 to revise the structural inventory and correct work description to match approved plans. updated work description to read: “convert portion (134 sf) of (e) detached garage (216 sf) to storage and convert remaining portion (82 sf) of (e) detached garage to accessory dwelling unit per ordinance and one-story ground flo... see more
Valuation:
N/A
Permit #:
20014-10002-02443
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Convert exisitng attached carport under 2nd level of existing 2 story duplex to adu per ordinance lamc 12.22 a.33(c) and (e)
Valuation:
$170,000
Permit #:
22014-10000-04276
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Supplemental permit to permit #21016-10000-37071 for changes to lid plans
Valuation:
$501
Permit #:
21016-10003-37071
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Building a new adu unit.
Valuation:
$250,000
Permit #:
2023-11964
Status:
N/A
Fee:
N/A
Permit Type:
N/A
Building Type:
Residential
**backroom johnny wu** supplemental to 20010-10000-01422. addition a 3'0"x4'6 window to the stair overrun on the roof level. no change to floor area height or footprint of the building. ** 2 of 4 **
Valuation:
$501
Permit #:
20010-10001-01422
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
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Verified License
BuildZoom confirmed this contractor's license
Cornerstone Construction and Design License info
Verified License
| License # | 775449 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of January 2026.
Verify this license's status for Cornerstone Construction and Design at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 713119 |
| 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. If this is your business, please update your license status.
Check this license's status for Cornerstone Construction and Design at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
110
BuildZoom Score
Bonded
| Bonded Agent | Accredited Surety & Casualty Company Inc |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | State Compensation Insurance Fund |
235
Permits
- Building permit records show that Cornerstone Construction and Design has worked on 235 permitted projects.
Cornerstone Construction and Design Employees
DH
Delmore Dean Holmstrom
Owner
MK
Michael Leecraft Kyle
Owner