In short
- 981 ADU permits since 2018.
- 220 in 2025, down 2% from 2024.
- Typical permit time: 238 days from application to permit (median of 472 permits with both dates recorded).
About this data
- Source: California HCD Housing Element Annual Progress Reports. The state data does not say whether an ADU is detached, attached, a garage conversion or a JADU, so most records show as 'unknown'. Permit valuations are not published in this source. Timelines use the application date the city reported to the state, matched to the permit where possible; some cities report their planning application date, so timelines can include planning review. Each project is counted once, in its building-permit year (or completion year when no permit date was reported).
Permits by year
Permits by year and type (table)
| Year | All ADU permits | Garage conversions | Detached |
|---|---|---|---|
| 2018 | 23 | 2 | 4 |
| 2019 | 39 | 9 | 16 |
| 2020 | 51 | — | — |
| 2021 | 119 | — | — |
| 2022 | 177 | — | — |
| 2023 | 127 | — | — |
| 2024 | 225 | — | — |
| 2025 | 220 | — | — |
“—” means the source for that year does not report ADU type.
Read more: ADU types explained
ADU rules in Chula Vista
State law check: No HCD review letter on file; that is not a finding of compliance. The city repealed its own ADU rules (April 15, 2025) and applies state law directly.
| Rule | Chula Vista's code | State law guarantees |
|---|---|---|
| Maximum size | Detached: 1,200 sq ft. Converted or attached: 50% of the house or 800 sq ft, whichever is greater. Junior ADU 500 sq ft. | At least 850 sq ft (1,000 sq ft with 2+ bedrooms) must be allowed; an 800 sq ft detached ADU always is. Conversions of existing space have no size cap. Junior ADU: up to 500 sq ft. |
| Height | Detached: 16 ft (18 ft within ½ mile of transit, 20 ft to match the house's roof pitch). Attached: 25 ft or the zone limit, whichever is less. Conversions: no limit. | Detached: at least 16 ft (18 ft within ½ mile of transit, plus 2 ft for a matching roof). Attached: 25 ft or the zone's limit, whichever is lower. |
| Setbacks | 4 ft side and rear; front setback only if an 800 sq ft ADU won't fit otherwise. | No more than 4 ft side and rear; none for conversions of existing space. |
| Parking | None. | At most 1 space; none within ½ mile of transit and in several other cases. No replacement parking when a garage is converted. |
| Owner living on site | None for ADUs. Junior ADU: owner-occupancy deed restriction. | None for ADUs. A junior ADU that shares a bathroom with the house requires the owner to live in one of them. |
| How many on a single-family lot | One new detached ADU, one converted or attached ADU (not both) and one junior ADU. | One ADU converted from existing space, one junior ADU and one new detached ADU (up to 800 sq ft). From January 1, 2027: two new detached ADUs (a city then needn't allow a junior ADU on that lot). |
| Short-term rentals | ADUs and junior ADUs applied for on or after January 1, 2020 can't be short-term rentals. | No guarantee: cities may require rentals of more than 30 days, and junior ADUs can't be short-term rentals. |
- Ordinance 3592 repealed the city's ADU and junior ADU sections (CVMC 19.58.022 and 19.58.023), so state law (Gov. Code 66314 to 66323) sets the standards.
- City Standard ADU plans (498 to 1,199 sq ft, 1 to 3 bedrooms) are reviewed in 14 business days instead of 21, with about $1,000 lower plan-review fees.
- Development impact fees apply to ADUs of 750 sq ft or more.
- The city's ADU loan program stopped taking applications in June 2024.
Where local rules conflict with state law, state law controls. Sources: Chula Vista Ordinance 3592 (April 15, 2025) · City of Chula Vista ADU page · Chula Vista Municipal Code 5.68.050; HCD's list of review letters; California ADU rules. Verified Oct 5, 2026. Rules change and every lot is different: confirm with the city before you design.
How long permits take
| Type | Median days, application to permit | Middle half | Permits |
|---|---|---|---|
| Detached ADU | not reported | ||
| Attached ADU | not reported | ||
| Garage conversion | not reported | ||
| Unclassified | 238 | 165 – 354 | 472 |
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
From permit to completion
Of the 451 ADU permits Chula Vista reported issuing from 2020 through 2023, 293 (65%) have a completion reported to the state. For those, the median time from permit to completion was 12 months.
The state reports don't record expired or cancelled permits, and a completion the city hasn't reported looks the same as an unfinished project, so the share is a floor. Years with incomplete reports are left out.
What neighbors declared as cost
Cost data (declared permit valuations) is not published for this area in these sources.
Read more: How to choose an ADU builder
An ADU builder serving Chula Vista? Feature your business on this page.
Questions about ADUs in Chula Vista
How many ADUs have been permitted in Chula Vista?
Public records show 981 ADU permits in Chula Vista from 2018 through 2025. 220 in 2025, down 2% from 2024. These counts come from the city's reports to the state, which place a project in its completion year when no permit date was reported.
How long does an ADU permit take in Chula Vista?
Among the 472 ADU permits in Chula Vista with both dates recorded, half were issued within 238 days of the application; the middle half took 165 to 354 days. That includes plan-check corrections and resubmittals, not just the review itself.
Can I build an ADU on my property in Chula Vista?
California law allows ADUs on most lots with a house, including in Chula Vista, but what you can build depends on your lot, local rules and utilities. This site shows permits, not eligibility. See California ADU rules.
Where do I apply for an ADU permit in Chula Vista?
Apply with the City of Chula Vista's Development Services Department, which offers City Standard ADU plans with a faster review. Official ADU page.
How current is this?
- State annual progress reports: through 2025 (published once a year)
How our data works · Download the data · Free to reuse with credit to SoCal ADU Tracker (socaladutracker.com), under CC BY 4.0.