In short
- 247 ADU permits on record, nearly all since 2020.
- 71 in 2025, up 42% from 2024.
- Typical permit time: 229 days from application to permit (median of 154 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 | 3 | — | — |
| 2019 | 5 | — | — |
| 2020 | 11 | 0 | 1 |
| 2021 | 28 | — | — |
| 2022 | 25 | — | — |
| 2023 | 54 | — | — |
| 2024 | 50 | 0 | 0 |
| 2025 | 71 | — | — |
“—” means the source for that year does not report ADU type.
Read more: ADU types explained
ADU rules in Newport Beach
State law check: HCD found the 2023 ordinance noncompliant (October 1, 2024), including its one-ADU-per-lot rule and attached-ADU height; the city amended it (Ord. 2025-20). We haven't seen HCD's response.
| Rule | Newport Beach's code | State law guarantees |
|---|---|---|
| Maximum size | 850 sq ft (studio or 1 bedroom) or 1,000 sq ft (2+ bedrooms). No cap for conversions; floor-area or coverage limits can't cut it below 800 sq ft. 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 near transit, plus 2 ft for roof pitch; 18 ft with a multistory apartment building). Over a detached garage: 2 stories within the zone limit. Attached: the zone's 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 (or the zone's, if less); none for conversions or rebuilds in the same footprint. | No more than 4 ft side and rear; none for conversions of existing space. |
| Parking | At most 1 space per ADU, none if exempt (transit, historic district, inside existing space, car share, or built with a new home outside the Coastal Zone). None for junior ADUs. | 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: the owner lives in the house or the junior ADU, with a 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 junior ADU plus up to one ADU in each category (inside existing space, attached, detached), unless state law allows more. | 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 | More than 30 days. | No guarantee: cities may require rentals of more than 30 days, and junior ADUs can't be short-term rentals. |
- Coastal Zone: a coastal development permit is also required unless the project is exempt or excluded (Title 21, Section 21.48.200); no public hearing is held for it.
- In the Coastal Zone, garage or carport parking removed for an ADU may have to be replaced, and the no-parking rule for ADUs built with a new home doesn't apply.
- A basement ADU with a walkout passage doesn't count toward the floor-area limit.
Where local rules conflict with state law, state law controls. Sources: Newport Beach Municipal Code 20.48.200 · Newport Beach Municipal Code 21.48.200 (Coastal Zone) · HCD findings (October 1, 2024); 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 | ||
| Junior ADU (JADU) | too few to say | 1 | |
| Unclassified | 228 | 126 – 361 | 153 |
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 102 ADU permits Newport Beach reported issuing from 2020 through 2023, 68 (67%) have a completion reported to the state. For those, the median time from permit to completion was 13 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
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Questions about ADUs in Newport Beach
How many ADUs have been permitted in Newport Beach?
Public records show 247 ADU permits in Newport Beach through 2025, nearly all since 2020. 71 in 2025, up 42% 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 Newport Beach?
Among the 154 ADU permits in Newport Beach with both dates recorded, half were issued within 229 days of the application; the middle half took 126 to 362 days. That includes plan-check corrections and resubmittals, not just the review itself.
Can I build an ADU on my property in Newport Beach?
California law allows ADUs on most lots with a house, including in Newport Beach, 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 Newport Beach?
Apply with the City of Newport Beach's Community Development Department, which offers ADU standard plans already reviewed by its Building and Planning divisions. 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.