About this data
- Neighborhood pages cover 2018 onward: City of San Diego Development Services Department permits located in this community planning area, the city's official neighborhood boundaries, 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.
- The city closes a permit both after its final inspection and after it expires, and its data doesn't say which, so this page doesn't estimate how many permits were finished. Closed permits stay in the counts.
Permits by year
Permits by year and type (table)
| Year | All ADU permits | Garage conversions | Detached |
|---|---|---|---|
| 2018 | 2 | 2 | 0 |
| 2019 | 19 | 7 | 4 |
| 2020 | 21 | 2 | 7 |
| 2021 | 24 | 6 | 5 |
| 2022 | 20 | 9 | 4 |
| 2023 | 50 | 13 | 2 |
| 2024 | 37 | 9 | 10 |
| 2025 | 46 | 13 | 10 |
| 2026 so far | 21 | 2 | 4 |
“—” means the source for that year does not report ADU type.
Read more: ADU types explained
Not counted: 27 expired or cancelled permits.
How Otay Mesa-Nestor compares
- Otay Mesa-Nestor has the 4th-most ADU permits (240) among Southern San Diego neighborhoods (5 on this site).
- Garage conversions are 26% of Otay Mesa-Nestor's ADU permits, higher than across Southern San Diego neighborhoods (23%).
- The median time from application to permit here is 236 days, shorter than the median across Southern San Diego neighborhoods (258 days).
- The median declared value of a detached ADU here is $101,556, lower than the median across Southern San Diego neighborhoods ($114,312).
ADU rules
San Diego's ADU rules apply citywide, with extra rules in the Coastal Zone and in very high fire hazard areas: see the rules table.
How long permits take
| Type | Median days, application to permit | Middle half | Permits |
|---|---|---|---|
| Detached ADU | 238 | 145 – 362 | 45 |
| Attached ADU | 408 | 179 – 408 | 46 |
| Garage conversion | 161 | 104 – 296 | 63 |
| Junior ADU (JADU) | 163 | 91 – 259 | 36 |
| Unclassified | 278 | 209 – 454 | 49 |
Middle half: the range covering the middle 50% of permits (a quarter were lower, a quarter higher).
Read more: How long ADUs take to build
What neighbors declared as cost
| Type | Median declared value | Middle half | Permits |
|---|---|---|---|
| Detached ADU | $101,556 | $73,640 – $144,993 | 37 |
| Attached ADU | $72,564 | $56,351 – $100,346 | 27 |
| Garage conversion | $53,148 | $40,764 – $77,368 | 53 |
| Junior ADU (JADU) | $56,448 | $47,399 – $71,450 | 36 |
| Unclassified | $77,287 | $45,122 – $116,310 | 30 |
Declared permit valuations often understate real construction cost.
Read more: How to choose an ADU builder
An ADU builder serving San Diego? Feature your business on this page.
Recent ADU permits in Otay Mesa-Nestor
- Detached ADU on Flax Ct (Nov 2026)
- Garage conversion on Pitcairn St (Oct 2026)
- Junior ADU (JADU) on Donax Av (Oct 2026)
- ADU on Donax Av (Sep 2026)
- ADU on Grove Av (Sep 2026)
- ADU on 16th (sb) St (Jul 2026)
Street names only. See each permit on the map.
Questions about ADUs in Otay Mesa-Nestor
How many ADUs have been permitted in Otay Mesa-Nestor?
The City of San Diego issued 240 permits for ADUs in Otay Mesa-Nestor from 2018 through Nov 4, 2026, including 63 garage conversions and 46 detached ADUs.
How long does an ADU permit take in Otay Mesa-Nestor?
From application to issued permit, the median in Otay Mesa-Nestor was 161 days for garage conversions and 238 days for detached ADUs.
How much does an ADU cost in Otay Mesa-Nestor?
The median value declared on permits was $53,148 for garage conversions and $101,556 for detached ADUs. Declared permit values often understate the full construction cost, so get several builder quotes.
Can I build an ADU on my property in Otay Mesa-Nestor?
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 City of San Diego Development Services Department or a licensed builder.
How current is this?
- City of San Diego permits: through Nov 4, 2026 (published daily)
How our data works · Download the data · Free to reuse with credit to SoCal ADU Tracker (socaladutracker.com), under CC BY 4.0.