Garage Addition & SB9 Unit at 10458 N De Soto Ave, Chatsworth - Porter Ranch
10458 N DE SOTO AVE, Chatsworth - Porter Ranch, 91311
Estimated Project Cost
$0
Bldg-Addition
Issued
April 29, 2026
Expires
—
License
—
About This Project
This permit authorizes the attachment of a new garage to an existing house, along with the conversion of that garage into a new SB9 unit, effectively creating a duplex in Chatsworth - Porter Ranch. This project includes the installation of fire sprinklers throughout.
Issued on April 29, 2026, the estimated cost for this significant addition and conversion project is $79,323. This figure provides a substantial data point for homeowners considering similar accessory dwelling unit (ADU) or duplex conversions under SB9 regulations.
What This Means For You
For Chatsworth - Porter Ranch residents, a project to add a garage and convert it into an SB9 unit, creating a duplex, is estimated to cost around $79,323.
The Business That Did This Work
Owner-Builder
Permit Details
| Tracking Number | 26014-20000-00332 |
| Work Permit # | — |
| Job Filing Number | — |
| Work Type | Bldg-Addition |
| Status | Issued |
| Job Description | EPLAN: attach (E)garage to house with NEW BREEZEWAY and convert (E) garage to NEW SB9 UNIT resulting in (N) duplex*NFPA-13D fire sprinklers thur-out* |
| Floor / Unit | — |
| Estimated Cost | $79,323 |
| Approved | January 29, 2026 |
| Issued | April 29, 2026 |
| Expires | — |
| BBL | — |
| BIN | — |
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