Updated: Dec 09, 2025
Location and Projects
Address
18809 ROSELLE AVENUE, Torrance, CA, 90504
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Williams Mark Irwin Architect
Their BuildZoom score of 0 does not rank in the top 50% of California contractors.
If you are thinking of hiring Williams Mark Irwin, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Williams Mark Irwin Services
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Williams Mark Irwin Contact Information
Address: 18809 ROSELLE AVENUE, Torrance, CA 90504
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Williams Mark Irwin Torrance
Quality
Alert*
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
*No active license on file. If you are Williams Mark Irwin, click “This is My Business” to update your information.
Activity
|
10 projects
|
2025 |
|
1 project
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Williams Mark Irwin has worked on at least
12.0 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
|
10 projects
|
Home Additions |
Analyzing permits over the last 4 years shows that Williams Mark Irwin mostly works on
home addition
projects.
Pricing
|
1 project
|
< $5k |
|
1 project
|
$5k-$20k |
|
4 projects
|
$20k-$50k |
|
2 projects
|
$50k-$100k |
|
4 projects
|
$100k-$250k |
|
1 project
|
$250k-$500k |
The typical size of their permits is approximately $63,670. 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.
This is a sample of this contractor's permits. Click here to access their complete permit history.
*eplan.* new addition (front side rear) to (e) 1-story single family dwelling. major remodel (ext. & int). roof re-frame and re-roof. < nfpa 13d fire sprinklers req thru-out building. >
Valuation:
$150,000
Permit #:
25014-10000-01484
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
*eplan* major remodel to existing single family dwelling; remove dwelling except for 2 of wall/foundation on north side of lot; addition new 37 x 53 single family dwelling with attached garage; equipped with nfpa 13-d fire sprinklers throughout
Valuation:
$314,000
Permit #:
25010-10000-00236
Status:
applied
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan. remodel existing 1-story single family dwelling and remove attached carport
Valuation:
$100,000
Permit #:
25014-10000-00438
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan: ground floor addition w vaulted ceiling to extend detached 1-story garage
Valuation:
$38,170
Permit #:
24014-10000-01206
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan. supplemental to 23014-10000-04119 to extend existing bedroom and remodel existing single family dwelling addition of new laundry room **plan check only permit**
Valuation:
$23,670
Permit #:
23014-10001-04119
Status:
approved
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan: major remodel and first and second story addition to (e) 1-story single family dwelling fire sprinkler nfpa13d
Valuation:
$218,889
Permit #:
24014-10000-02507
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Building alteration to replace roof for existing storage. all work per engineered design. comply with department order effective date 12/18/2019. permit will expire 30 days from issuance date
Valuation:
$3,000
Permit #:
19016-40000-40715
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan: addition and convert (e) 1-story garage to 2-story accessory dwelling unit per lamc 12.22.a.33.(c)-(d)
Valuation:
$80,000
Permit #:
24014-10000-03218
Status:
plancheck
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan (n) 19'-10 x 15'-10 addition to (e) single family dwelling for master bedroom convert (e) master bedroom into (n) master bathroom
Valuation:
$40,000
Permit #:
23014-10000-05292
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
**eplan***alteration to (e) single family dwelling scope of work to include: remodel existing single family dwelling addition new covered porch laundryroom and addition at the rear of the dwelling
Valuation:
$63,670
Permit #:
23014-10000-04119
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan. remodel and addition to existing single family residence
Valuation:
$35,000
Permit #:
25014-10000-02336
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan. storage room addition to an existing detached garage
Valuation:
$40,600
Permit #:
24014-10000-04243
Status:
plancheck
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Convert (e) garage with addition to detached adu per ordinance (2-story)
Valuation:
$118,000
Permit #:
23014-10000-01497
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
New 1200 sqft detached adu at rear
Valuation:
N/A
Permit #:
22010-10000-00759
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan- convert existing garage to adu with 2nd floor addition ( 1024 sf) and addition of recreation room (242 sf)
Valuation:
$137,000
Permit #:
22014-10000-04709
Status:
final
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Addition to existing living room and porch addition
Valuation:
N/A
Permit #:
22014-10000-00696
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
1-story addition (400 sf) and remodel to (e) single story single family dwelling (1 410 sf) to addition a bedroom bathroom and convert (e) attach. laundry room (220 sf) to an attach. 1-car garage (220 sf) per za-2021-8847-zaa
Valuation:
$65,000
Permit #:
20014-30000-05334
Status:
issued
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan: new retaining wall and block wall
Valuation:
$10,000
Permit #:
25020-10000-02439
Status:
triage
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
Eplan: demolish existing detached garage
Valuation:
$2,000
Permit #:
25019-10000-04250
Status:
applied
Fee:
N/A
Permit Type:
1 or 2 family dwe...
Building Type:
N/A
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Williams Mark Irwin License info
License Not Verified
| License # | C28727 |
| Status | Active |
| State | California |
| Type | Architect |
- When BuildZoom last verified this license, it had an expiration date of September, 2025. Check the current license status of Williams Mark Irwin with the California Architect License Board
This is a sample of licensing data; click here to access a complete history.
Inactive License
| Status | Inactive |
| State | Florida |
| Type | Architect |
- According to the Florida Department of Business & Professional Regulation, 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.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
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- *No active license on file. If you are Williams Mark Irwin, click “This is My Business” to update your information.
12
Permits
- Building permit records show that Williams Mark Irwin has worked on 12 permitted projects.
Williams Mark Irwin Employees
WI
Williams Mark Irwin
Owner