In short
- 72 ADU permits since 2018.
- 29 in 2025.
- Typical permit time: 122 days from application to permit (median of 50 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).
- Cypress reported far fewer ADUs for 2019, 2020 and 2024 than for the years around them; those years likely understate permit activity.
Permits by year
Permits by year and type (table)
| Year | All ADU permits | Garage conversions | Detached |
|---|---|---|---|
| 2018 | 8 | — | — |
| 2019 (incomplete report) | 1 | — | — |
| 2020 (incomplete report) | 2 | — | — |
| 2021 | 9 | — | — |
| 2022 | 12 | 0 | 0 |
| 2023 | 10 | — | — |
| 2024 (incomplete report) | 1 | — | — |
| 2025 | 29 | — | — |
“—” means the source for that year does not report ADU type.
Read more: ADU types explained
Not counted above: 20 approved projects with no building permit reported yet.
ADU rules in Cypress
State law check: HCD found the city's ADU ordinance out of line with state law (May 15, 2025), including its one-ADU limit. In May 2026 HCD said the ordinance on file is still the 2023 version.
| Rule | Cypress' code | State law guarantees |
|---|---|---|
| Maximum size | 1,200 sq ft; attached ADUs also 50% of the house. Other limits can't cut an ADU 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: one story, 16 ft (18 ft near transit, 20 ft to match the roof pitch). Attached: 2 stories, 25 ft. | 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 for new ADUs; front setback same as the house. None extra for conversions. | No more than 4 ft side and rear; none for conversions of existing space. |
| Parking | 1 space per ADU, none for studios, near transit or in other state-law cases. No replacement parking. Junior ADU: 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 | For ADUs created on or after January 1, 2025, the owner must live in the house or the ADU, with a recorded deed restriction. Junior ADU: owner lives on site. | 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 ADU 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 | More than 30 days, for ADUs and junior ADUs. | No guarantee: cities may require rentals of more than 30 days, and junior ADUs can't be short-term rentals. |
- The code's owner-occupancy rule for new ADUs goes beyond state law, which bars owner-occupancy requirements for ADUs (Gov. Code § 66315).
- No ADUs or junior ADUs on lots that used an SB 9 duplex and lot split.
- Exterior materials must match the house.
Where local rules conflict with state law, state law controls. Sources: Cypress Zoning Ordinance 3.17.200 (Ord. 1206, November 13, 2023) · HCD findings (May 15, 2025) · HCD letter (May 11, 2026); 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 |
|---|---|---|---|
| Junior ADU (JADU) | too few to say | 2 | |
| Unclassified | 122 | 73 – 210 | 48 |
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 31 ADU permits Cypress reported issuing from 2021 through 2023, 24 (77%) have a completion reported to the state. For those, the median time from permit to completion was 9 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 Cypress? Feature your business on this page.
Questions about ADUs in Cypress
How many ADUs have been permitted in Cypress?
Public records show 72 ADU permits in Cypress from 2018 through 2025. 29 in 2025. 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 Cypress?
Among the 50 ADU permits in Cypress with both dates recorded, half were issued within 122 days of the application; the middle half took 70 to 206 days. That includes plan-check corrections and resubmittals, not just the review itself.
Can I build an ADU on my property in Cypress?
California law allows ADUs on most lots with a house, including in Cypress, 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 Cypress?
Apply with the City of Cypress Community Development Department, which reviews ADUs through building plan check. 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.