About this data
- Neighborhood pages cover 2020 onward: City of Los Angeles Department of Building and Safety permits in this neighborhood's Neighborhood Council area, which may not match every local definition of the neighborhood. Build type is classified automatically from permit descriptions.
- Costs are declared permit valuations (single-ADU permits only), not final construction costs.
Permits by year
Permits by year and type (table)
| Year | All ADU permits | Garage conversions | Detached |
|---|---|---|---|
| 2020 | 5 | 4 | 1 |
| 2021 | 1 | 0 | 1 |
| 2022 | 11 | 4 | 2 |
| 2023 | 4 | 2 | 0 |
| 2024 | 4 | 3 | 0 |
| 2025 | 11 | 5 | 4 |
| 2026 so far | 10 | 5 | 1 |
“—” means the source for that year does not report ADU type.
Read more: ADU types explained
How Porter Ranch compares
- Porter Ranch has the 28th-most ADU permits (46) among Los Angeles' San Fernando Valley neighborhoods (28 on this site).
- Garage conversions are 50% of Porter Ranch's ADU permits, higher than across Los Angeles' San Fernando Valley neighborhoods (43%).
- The median time from application to permit here is 131 days, longer than the median across Los Angeles' San Fernando Valley neighborhoods (123 days).
ADU rules
Los Angeles' ADU rules apply citywide, with extra rules for hillside, fire-zone and coastal lots: see the rules table.
How long permits take
| Type | Median days, application to permit | Middle half | Permits |
|---|---|---|---|
| Detached ADU | too few to say | 9 | |
| Attached ADU | too few to say | 8 | |
| Garage conversion | 77 | 42 – 165 | 23 |
| Junior ADU (JADU) | too few to say | 5 | |
| Unclassified | too few to say | 1 |
Middle half: the range covering the middle 50% of permits (a quarter were lower, a quarter higher).
Read more: How long ADU permits take in Los Angeles (and other cities) · How long ADUs take to build
What happened to these permits
Of the 21 ADU permits issued in Porter Ranch from 2020 through 2023, including ones that later expired or were cancelled, 86% have been signed off by the city as finished. Where the certificate of occupancy date is recorded, it came a median of 12 months after the permit.
| What became of the permit | Share |
|---|---|
| Finished (signed off by the city) | 86% |
| Still open | 14% |
| Expired or cancelled | 0% |
Expired and cancelled permits aren't in this page's totals; they're included here so the table covers every permit issued. A still-open permit may be under construction or stalled.
What neighbors declared as cost
| Type | Median declared value | Middle half | Permits |
|---|---|---|---|
| Detached ADU | too few to say | 9 | |
| Attached ADU | too few to say | 5 | |
| Garage conversion | $28,000 | $20,000 – $47,500 | 23 |
| Junior ADU (JADU) | too few to say | 5 | |
| Unclassified | too few to say | 1 |
Declared permit valuations often understate real construction cost.
Read more: What ADUs cost in Los Angeles
Read more: How to choose an ADU builder
An ADU builder serving Los Angeles? Feature your business on this page.
Recent ADU permits in Porter Ranch
- Detached ADU on Derwent Pl (Aug 2026)
- Garage conversion on Vista Grande Way (Jun 2026)
- Garage conversion on Lugano Way (May 2026)
- Garage conversion on Reseda Blvd (Apr 2026)
- Attached ADU on Seminole Cir (Mar 2026)
- Junior ADU (JADU) on Twin Hills Ave (Mar 2026)
Street names only. See each permit on the map.
Questions about ADUs in Porter Ranch
How many ADUs have been permitted in Porter Ranch?
The City of Los Angeles issued 46 permits for ADUs in Porter Ranch from 2020 through Oct 31, 2026, including 23 garage conversions and 9 detached ADUs.
How long does an ADU permit take in Porter Ranch?
From application to issued permit, the median in Porter Ranch was 77 days for garage conversions.
How much does an ADU cost in Porter Ranch?
The median value declared on permits was $28,000 for garage conversions. Declared permit values often understate the full construction cost, so get several builder quotes.
How long does it take to build an ADU in Porter Ranch?
Of the 21 ADU permits issued in Porter Ranch from 2020 through 2023, including ones that later expired or were cancelled, 86% have been signed off by the city as finished. Where the certificate of occupancy date is recorded, it came a median of 12 months after the permit.
Can I build an ADU on my property in Porter Ranch?
California law allows ADUs on most residential lots with a house, but what you can build depends on your lot, zoning and hillside or fire-zone rules. This site shows permits, not eligibility; check with the Los Angeles Department of Building and Safety or a licensed builder.
How current is this?
- City of Los Angeles permits: through Oct 31, 2026 (published about weekly)
How our data works · Download the data · Free to reuse with credit to SoCal ADU Tracker (socaladutracker.com), under CC BY 4.0.