Updated: Mar 23, 2026
Location and Projects
Address
8321 SHEILA ST, El Cajon, CA, 92021
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Mad Construction
Mad Construction, 8321 Sheila St, El Cajon, CA (Owned by: Michael Anthony Diepenhorst) holds a General Building license and 1 other license according to the California license board.
Their BuildZoom score of 93 ranks in the top 27% of 336,931 California licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Mad Construction, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
Mad Construction Services
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Mad Construction Contact Information
Phone Number: (951) 255-6281
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Address: 8321 SHEILA ST, El Cajon, CA 92021
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This is a sample of this contractor's permits. Click here to access their complete permit history.
New residential detached accessory structure - plan check-permit
2013-09-11
Cross street: los coches rd foundation: slab description of work: 480 sqft detached unfinished garage w 100 amp subpanel
Valuation:
$18,749
Permit #:
PDS2013-RESACC-000459
Status:
complete
Fee:
$1,742
Permit Type:
N/A
Building Type:
N/A
New residential detached accessory structure - plan check-permit
2011-09-16
Cross street: brockway description of work: 196 sf deck for existing single family dwelling
Valuation:
$3,391
Permit #:
PDS2011-1005-20110501
Status:
complete
Fee:
$474
Permit Type:
N/A
Building Type:
N/A
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Mad Construction Reviews
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Recent Buildzoom Projects
Verified License
BuildZoom confirmed this contractor's license
Mad Construction License info
Verified License
| License # | 840102 |
| 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 Mad Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 892880 |
| 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 Mad Construction at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
Bonded
| Bonded Agent | Suretec Indemnity Company |
| Bond Value | $15,000 |
Insured
| Workers Comp Provider | Technology Insurance Company Inc |
Mad Construction Employees
MD
Michael Anthony Diepenhorst
Owner
MD
Michael Anthony Donohue
Sole Owner