Coronado ADU Regulations & Zoning
(City of Coronado, CA) - 2026

In Coronado, a single-family lot generally allows either 1 ADU or 1 JADU, with an important allowance that a qualifying new ADU (meeting the City’s required “must-permit” category) may be paired with one JADU on the same lot.

Supporting details:

• The code states a cap of one ADU or one JADU per single-family lot, but also provides a pathway where an ADU and a JADU can coexist under specified conditions.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, the maximum floor area for an attached or detached ADU is 850 sq ft for a studio/one-bedroom and 1,000 sq ft for two or more bedrooms.

Supporting details:

• The ADU also must meet minimum size rules tied to “efficiency unit” standards.
• Underlying zone rules (like FAR/lot coverage) still apply, subject to ADU-specific protections.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, a Junior Accessory Dwelling Unit (JADU) may be up to 500 square feet and must include an efficiency kitchen (as specified by the City).

Supporting details:

• JADUs must include access to sanitation facilities.
• JADUs have an owner-occupancy rule (see FAQ #18).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, most new ADUs must maintain at least 4-foot side and rear setbacks (or the zone setback, whichever is less), but no setback is required for certain conversions or rebuild-in-place ADUs that stay within the footprint of a legally approved structure.

Supporting details:

• “No setback” scenarios include some conversions of existing living area/accessory structures, or a new ADU built in the same location/dimensions as a legally approved existing structure.
• The City may require survey verification for footprint/placement in those cases.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, a detached ADU is generally limited to 16 feet in height, with specific scenarios that allow 18 feet (and a limited additional roof-pitch accommodation in one case).

Supporting details:

• Attached ADUs follow the primary dwelling’s height rules.
• The code ties the 18-foot allowance to specific criteria (including certain transit-related definitions and multifamily conditions).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

Yes. In Coronado, the zoning code requires that certain “specified standards” (like lot coverage/FAR/open space/front setbacks/size limits) must still allow at least an 800 sq ft ADU at 16 ft tall with 4-ft side/rear yards, and the City must grant a narrowly tailored exception if those standards would physically preclude that baseline ADU.

Supporting details:

• The exception is intended to be the minimum necessary to allow the baseline ADU.
• Other development standards still apply.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, the City may require up to 1 parking space per ADU, with no parking required for deed-restricted affordable ADUs, and no additional parking required for a JADU.

Supporting details:

• Allowed formats include tandem and spaces in side/rear setbacks.
• Front-yard setback parking is limited to within an existing driveway.
• Coronado’s coastal context is explicitly referenced in the code’s findings.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105
• https://www.coronado.ca.us/CivicAlerts.aspx?AID=882

Often, yes. In Coronado, if an ADU/JADU project removes parking that is required for the primary dwelling (for example, via a garage conversion), the code requires replacement parking (with specific allowances on where it can be located).

Supporting details:

• Replacement spaces may be covered or uncovered.
• Replacement spaces may be in side/rear setbacks; front-yard is limited to existing driveway area.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

No. In Coronado, ADUs and JADUs are restricted to rentals of six consecutive months or more, and the City’s ADU application handout also states ADUs/JADUs may not be rented as short-term vacation rentals.

Supporting details:

• This is stricter than the “no very-short stays” framing many people associate with ADU rules—so it’s crucial to underwrite your project’s ROI using Coronado’s actual minimum term.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105
• https://www.coronado.ca.us/DocumentCenter/View/1072/Handout-721-Accessory-Dwelling-Unit-Application-PDF

In Coronado, ADUs generally must provide a new or separate utility connection directly between the ADU and the utility, and the City notes a submeter may be allowed; however, the code also provides exceptions (including for JADUs and certain qualifying ADUs).

Supporting details:

• Utility connection fees/capacity charges (when applicable) must be proportionate to the ADU’s burden and capped to reasonable cost (per the code’s framework).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, an ADU is not required to add fire sprinklers if sprinklers are not required for the primary residence, and building an ADU should not trigger sprinklers in the existing primary dwelling.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, no impact fees may be imposed on an ADU/JADU that is under 750 sq ft; for 750 sq ft or more, impact fees must be charged proportionately relative to the primary dwelling’s square footage (as stated in the City’s ADU code section).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, compliant ADU/JADU applications are processed ministerially, and the City’s code requires approval/denial within 60 days after receiving a complete application.

Supporting details:

• The City’s ADU application handout (dated June 2020) also references a “60 days” completeness concept, so you should rely primarily on the current municipal code process language and submit a complete package.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105
• https://www.coronado.ca.us/DocumentCenter/View/1072/Handout-721-Accessory-Dwelling-Unit-Application-PDF

Yes. Coronado explicitly references carriage houses and allows conversion to an ADU when the carriage house complies with the City’s carriage house standards and the ADU conversion rules.

Supporting details:

• Carriage houses have detailed alley/lot configuration and building form standards (including size caps per story and separation/open space rules).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105
• https://coronado.municipal.codes/CMC/86.56.110%28D%29
• https://www.coronado.ca.us/CivicAlerts.aspx?AID=882

Yes. In Coronado, multifamily properties may add ADUs through (a) converting non-livable portions of existing multifamily structures (up to 25% of existing units, but at least 1), and (b) building up to two detached ADUs on a lot with an existing multifamily structure (subject to standards).

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

No. In Coronado, an ADU/JADU may not be sold, transferred, or otherwise conveyed separately from the primary residence.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

In Coronado, before a building permit is issued for an ADU/JADU, the owner must record a covenant with the County Recorder that provides notice of key restrictions (including no separate sale, rental-term limits, and other required conditions described in the City code).

Supporting details:

For JADUs, the code also includes an owner-occupancy rule (one of the dwellings must be the owner’s principal residence) and covenant requirements addressing that.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

Yes. Coronado requires ADUs/JADUs to use the same architectural style, exterior materials, and colors as the primary dwelling, with materials that are the same quality or better.

Official sources (URLs):

• https://coronado.municipal.codes/CMC/86.56.105

For Coronado, choose ADU builders/design-build teams who (1) can demonstrate ADU/JADU experience under CMC 86.56.105, (2) understand coastal/city logistics like right-of-way constraints, and (3) are properly licensed and verifiable through California’s CSLB tools.

High-value checks:

• Verify CSLB license status before signing (and confirm it’s active and properly classified).
• If your project needs a crane, dumpster, or work in the public right-of-way, confirm the contractor can comply with Coronado’s right-of-way permit requirements.
• Ask whether they’ve successfully handled Coronado specifics like replacement parking, recorded covenants, and design-compatibility rules.

Official sources (URLs):

• https://web.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx
• https://oag.ca.gov/consumers/general/contractors
• https://www.coronado.ca.us/321/Right-of-Way-Permits
• https://coronado.municipal.codes/CMC/86.56.105