Updated: Mar 01, 2026
Location and Projects
Address
1143 KNOLLWOOD DR, Newbury Park, CA, 91320
Use our bidding system to
request a quote
Castleby Construction HVAC/Mechanical Contractor
Castleby Construction, 1143 Knollwood Dr, Newbury Park, CA (Owned by: Scott Willam Umpleby) holds a General Building 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 Castleby Construction, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Castleby Construction Services
Start a project today:
Castleby Construction Contact Information
Phone Number: (805) 427-5250
Edit
Address: 1143 KNOLLWOOD DR, Newbury Park, CA 91320
Edit
Do you work for this business? Unlock this free profile to update company info and see who's viewing your profile.
Castleby Construction Newbury Park
Quality
102
89th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
Castleby Construction has a BuildZoom score of 102, which places them above 89% of 336,931 contractors in California.
Activity
|
2 projects
|
2024 |
Our building permit records indicate that Castleby Construction has worked on at least
2.0 projects over the past 2 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
|
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 Castleby Construction
This is a sample of this contractor's permits. Click here to access their complete permit history.
Plumbing for: existing detached garage conversion to adu 600 sf. 1 bedroom 1 bathroom. return air from one dwelling unit shall not discharge into another dwelling unit through the heating or cooling air system. cmc 311.4
Valuation:
$90,000
Permit #:
PLM-2024-00688
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Mechanical for: existing detached garage conversion to adu 600 sf. 1 bedroom 1 bathroom. return air from one dwelling unit shall not discharge into another dwelling unit through the heating or cooling air system. cmc 311.4
Valuation:
$90,000
Permit #:
MEC-2024-00581
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Electrical for: existing detached garage conversion to adu 600 sf. 1 bedroom 1 bathroom. return air from one dwelling unit shall not discharge into another dwelling unit through the heating or cooling air system. cmc 311.4
Valuation:
$90,000
Permit #:
ELE-2024-00877
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Existing detached garage conversion to adu 600 sf. 1 bedroom 1 bathroom. return air from one dwelling unit shall not discharge into another dwelling unit through the heating or cooling air system. cmc 311.4
Valuation:
$90,000
Permit #:
BLD-2024-00966
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Garage addition to make a two car garage space adding 159 sq ft new outlets and ev charging unit
Valuation:
N/A
Permit #:
C22-001430
Status:
issued
Fee:
$1,851
Permit Type:
N/A
Building Type:
Building
Detached garage to adu conversion
Valuation:
$90,000
Permit #:
BLD-2024-00573
Status:
canceled
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
55 lf. 3 capped sewer line ofor future use for proposed adu only per plan
Valuation:
N/A
Permit #:
PLM-2024-00904
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Wall removal in kitchen/dining area
Valuation:
$40,000
Permit #:
2021-665-PR-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Wall removal in kitchen/dining area
Valuation:
$40,000
Permit #:
2021-665-MR-0-0-0
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Wall removal in kitchen/dining area
Valuation:
$40,000
Permit #:
2021-665-ER-0-0-0
Status:
expired
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Wall removal in kitchen/dining area
Valuation:
$40,000
Permit #:
2021-665-B-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition and interior remodel
Valuation:
$32,251
Permit #:
2020-3120-PR-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition and interior remodel
Valuation:
$32,251
Permit #:
2020-3120-MR-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition and interior remodel
Valuation:
$32,251
Permit #:
2020-3120-ER-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Addition and interior remodel
Valuation:
$32,251
Permit #:
2020-3120-B-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Balcony deck repair
Valuation:
$500
Permit #:
2022-2108-B-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
N/A
Permit #:
17-4224/000 000 PR 00
Status:
complete
Fee:
$162
Permit Type:
plumbing & mechan...
Building Type:
One family reside...
No Description Available
Valuation:
N/A
Permit #:
17-4224/000 000 MR 00
Status:
complete
Fee:
$162
Permit Type:
plumbing & mechan...
Building Type:
One family reside...
No Description Available
Valuation:
N/A
Permit #:
17-4224/000 000 ER 00
Status:
complete
Fee:
$162
Permit Type:
plumbing & mechan...
Building Type:
One family reside...
Water heater and fau to attic
Valuation:
N/A
Permit #:
2017-4224-PR-0-0-0
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Similar Contractors See more
142
BZ Score
$6K
Avg Project
-
Projects
138
BZ Score
-
Avg Project
-
Projects
146
BZ Score
$9.2K
Avg Project
-
Projects
Castleby Construction Reviews
BuildZoom hasn't received any reviews for Castleby Construction. Click here to be alerted when reviews are posted about them.
Recent Buildzoom Projects
Let us find you an HVAC pro in your area today
We'll search our vast network of HVAC Pros and connect
you with one that meets your needs today.
Verified License
BuildZoom confirmed this contractor's license
Castleby Construction License info
Verified License
| License # | 919991 |
| Status | Active |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- BuildZoom verified this license was active as of February 2026.
Verify this license's status for Castleby Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
102
BuildZoom Score
Insured
| Insurer | Cumis Specialty Insurance Company Inc |
| Insured up to | $1,000,000 |
Bonded
| Bonded Agent | Wesco Insurance Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | This License Has Workers Compensation Insurance With The |
14
Permits
- Building permit records show that Castleby Construction has worked on 14 permitted projects.
Castleby Construction Employees
CC
Cristen Anne Castner
Member
SU
Scott Willam Umpleby
Owner
SU
Scott William Umpleby
Sole Owner