Unincorporated Santa Cruz County (the area outside the four incorporated cities of Santa Cruz, Capitola, Watsonville, and Scotts Valley, including communities such as Aptos, Soquel, Live Oak, Felton, Ben Lomond, Boulder Creek, Davenport, La Selva Beach, and Corralitos) regulates accessory dwelling units under Santa Cruz County Code Title 13 (Zoning), Chapter 13.10 (Zoning Regulations), Section 13.10.681 (Accessory Dwelling Units and Junior Accessory Dwelling Units). The current ordinance was adopted by the Board of Supervisors as Ordinance No. 5382 on October 19, 2021, and was last amended in 2023; the California Department of Housing and Community Development (HCD) issued findings on February 25, 2025 identifying provisions that do not yet conform with the most recent state ADU laws, so additional amendments are pending. The local rules implement California Government Code Sections 65852.2 (ADUs) and 65852.22 (JADUs) and the changes in AB 2221 (2022, setback and lot-coverage fixes), SB 897 (2022, height and demolition rules), and AB 1033 (2023, optional separate-sale condominium ADUs). One ADU plus one JADU is allowed by right on every legal single-family lot in the unincorporated County, ministerial approval is required, detached ADUs are capped at 850 to 1,200 square feet depending on parcel size and bedroom count, JADUs are capped at 500 square feet inside the existing dwelling, short-term rentals (under 30 days) are prohibited in any ADU or JADU, and ADUs in the Coastal Zone require a Coastal Development Permit that is processed concurrently with the building permit.
Santa Cruz County's ADU regulations are codified at Santa Cruz County Code Section 13.10.681 within Title 13 (Zoning), with the related efficiency-kitchen definition in Section 13.10.700-E. The current ordinance was adopted by the Board of Supervisors as Ordinance No. 5382 on October 19, 2021 and amended in 2023 to track AB 2221 and SB 897. On February 25, 2025 HCD issued an ordinance-review letter finding that several local provisions do not yet match current state ADU and JADU law, so the County is in the process of further amendments; until those amendments take effect, any local provision that is more restrictive than state law is preempted under Government Code Section 65852.2(a)(8) and the County must process applications under the state default standards. Maximum unit sizes are tied to parcel size and bedroom count: a detached new-construction ADU on a parcel under one acre may be up to 850 square feet for a studio or one-bedroom and 1,000 square feet for a two-or-more-bedroom unit, while a detached ADU on a parcel of one acre or more may be up to 1,200 square feet; an attached ADU is permitted at the greater of 50 percent of the primary dwelling floor area or 850 to 1,000 square feet (state law requires the County to allow at least 800 square feet regardless of percentage); a conversion ADU is capped at the existing footprint with no maximum imposed by the County; and a JADU is limited to 500 square feet contained entirely within the walls of the existing or proposed single-family dwelling and must include an efficiency kitchen and either a separate exterior entrance or interior connection to the primary dwelling. Side and rear setbacks are reduced to four feet for detached ADUs, no setback is required when an existing legal garage or accessory structure is converted in place, and the front setback applicable to the primary residence continues to apply (with state-law waiver if needed to fit an 800-square-foot ADU). Maximum height is 16 feet for a stand-alone detached ADU inside the Urban Services Line, with up to 21 feet allowed by approval, 18 feet within one-half mile walking distance of a major transit stop or high-quality transit corridor (with up to 20 feet to match the primary roof pitch), and up to 24 feet over a detached garage (with the outside wall capped at 20 feet); attached ADUs follow the underlying zone-district height standard (typically 28 feet). Parking is one space per new-construction ADU unless any state-law exemption applies (within one-half mile of public transit, within a historic district, part of a permit-required street parking area, within one block of a designated car-share, or part of new construction with no replacement parking required); JADUs and conversion ADUs require no parking. Inside the Coastal Zone, however, the parking exemptions are narrower: in the Live Oak Designated Area (LODA), the Seacliff/Aptos/La Selva Designated Area (SALSDA), the Davenport/Swanton Designated Area (DASDA), and along Opal Cliff Drive between 41st Avenue and the Capitola city limits, one parking space is required for every new-construction ADU with no exceptions, and replacement parking must be provided whenever existing parking is demolished or converted to build an ADU. JADUs require recordation of a deed restriction prohibiting separate sale from the single-family residence and requiring owner occupancy of either the JADU or the primary unit, mirroring Government Code Section 65852.22(a)(5); owner occupancy is not required for standard ADUs constructed under Section 65852.2. New detached ADUs must include a photovoltaic system meeting the California Energy Code (Title 24). Fire-safety overlays are significant in unincorporated Santa Cruz County because the San Lorenzo Valley, the Summit area, Bonny Doon, Davenport, and the Santa Cruz Mountains contain extensive Very High Fire Hazard Severity Zones (VHFHSZ) mapped by CAL FIRE; ADUs in these areas must meet Chapter 7A ignition-resistant construction standards in the California Building Code, defensible space under Public Resources Code Section 4291 enforced by CAL FIRE or the local fire protection district (such as Boulder Creek FPD or Felton FPD), and fire sprinklers when sprinklers are required for the primary residence. New ADUs in the Coastal Zone require a Coastal Development Permit under Chapter 13.20 SCCC, processed concurrently with the building permit; in the case of a conflict between Chapter 13.10 and Chapter 13.20, the regulations most protective of coastal resources and most consistent with the Local Coastal Program Land Use Plan and the California Coastal Act take precedence. Short-term rentals (any rental of less than 30 consecutive days) are prohibited in ADUs and JADUs under Section 13.10.681. AB 1033 (2023) gave the County the option to authorize ADUs to be sold separately as condominiums; as of the 2025 ordinance update cycle, Santa Cruz County has not affirmatively opted in. Inside the four city limits the County rules do not apply: the Cities of Santa Cruz, Capitola, Watsonville, and Scotts Valley each have their own ADU ordinances. ADU permits are issued ministerially within 60 days of a complete application as required by Government Code Section 65852.2(b), processed online through the County's ePlan review system by the Community Development and Infrastructure (CDI) Department's Planning Division, with companion building, fire, and (for parcels on septic) Environmental Health on-site wastewater approvals.
Constructing or occupying an ADU or JADU in unincorporated Santa Cruz County without an approved building permit, ADU permit, and (where applicable) Coastal Development Permit, septic clearance, and fire approvals violates Section 13.10.681 and the building code adopted under Title 12. Santa Cruz County CDI Code Compliance investigates complaints under Chapter 19.01 of the County Code, which authorizes administrative citations with civil penalties typically starting at $100 for the first violation, $200 for a second within twelve months, and $500 for each subsequent violation, continuing daily until corrected, plus recovery of investigation costs. Unpermitted ADU construction may also be enjoined by the County and abated through the Superior Court, and unpermitted living units in a Very High Fire Hazard Severity Zone or Wildland-Urban Interface area can trigger additional fire-code enforcement by CAL FIRE or the responsible local fire protection district. Renting an ADU or JADU for fewer than 30 consecutive days violates Section 13.10.681 and the County's separate vacation rental ordinance, with fines that escalate per violation. Selling a JADU separately from the single-family residence, or failing to record the JADU deed restriction required by Government Code Section 65852.22(a)(5), is independently enforceable and can result in revocation of the certificate of occupancy. Failure to maintain Public Resources Code Section 4291 defensible space around an ADU in a fire-hazard zone is citable by CAL FIRE or the local fire district. Performing ADU work in the Coastal Zone without a Coastal Development Permit can be challenged before the California Coastal Commission and is subject to Coastal Act civil penalties under Public Resources Code Section 30820, which can reach $15,000 per violation plus daily penalties for knowing and intentional violations. Appeals from a CDI Planning decision are taken to the Zoning Administrator, then the Planning Commission, and then the Board of Supervisors under Chapter 18.10 of the County Code; in the Coastal Zone, decisions on Coastal Development Permits may be appealable to the California Coastal Commission depending on location and project type.
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