What you can build
Coronado ADU Regulations & Zoning
ADU regulations are complex, but when you’ve done this for 100+ projects, you know the details inside and out. We publish our insights because we want people to get accurate information… not just regurgitated bullet points. Our summary was last updated in April 2026.
Key Facts SnapShot
Size and Separation
Maximum size 1,000 square feet
Side/rear setbacks 4 feet
Two story No
Building separation 10 feet
Additional Requirements
Soils Report No
Building Verification Survey No
Coastal permit (in some areas) Yes
Stormwater Mitigation No
Permitting timeline
Standard Timeline: 3-4 months
Coastal Timeline: 4-5 months
Permit Costs: $8-12/sqft
Our ADU experience in Coronado
Coronado’s ADU regulations are largely in line with state guidelines, allowing up to 1,000 square feet. With a smaller building department, regulation questions are answered swiftly. And while the entire city is in the coastal zone, ADUs do not require a separate CDP (meaning no added expense or time).
Number of ADUs Allowed
How many ADUs can you build in Coronado?
On single-family lots in Coronado, state law now supports a broader mix of ADU types than many homeowners previously realized. Under California law, a single-family property may combine:
- one standard ADU under the regular local-rules pathway
- one detached ADU up to 800 square feet
- one ADU created from existing space in the primary home or an accessory structure
- one JADU created from existing space in the primary residence, up to 500 square feet
HCD’s updated 2026 ADU Handbook explains that local agencies must allow the single-family combinations described in Government Code section 66323 and, in addition, must allow at least one unit described in section 66314.
However, note that local adoption will take some time.
Read more in our guide to how many ADUs you can build on a single-family property.
How many ADUs does Coronado allow for multifamily properties?
Coronado allows at least 2 detached ADUs for multifamily lots with an existing multi-family building. (Meaning: In order to build 2 ADUs, the property must already have at least a duplex on it, not just a single family dwelling)
Multifamily property owners are permitted to build as many ADUs as there are existing units, with a maximum of eight detached ADUs.
Additionally, a minimum of one accessory dwelling unit, or up to 25 percent of the existing multifamily units, is permitted within an existing multifamily dwelling, as a result of the conversion of non-habitable space including, but not limited to, storage rooms, boiler rooms, passageways, attics, basements, or garages.
Read more about the rules around how many ADUs you can build on a multifamily lot.
ADU Size & Building Constraints
What size detached ADU can you build in Coronado?
Coronado allows for a detached ADU up to 850 sqft for units with 1 bedroom, and up to 1000 sqft for 2+ bedrooms. ADUs up to 800 sqft are exempt from lot coverage requirements. (Meaning: You can build an ADU of this size even if you’re maxed out on lot coverages).
What is the height requirement for an ADU in Coronado?
A new detached ADU or an addition to an existing detached structure for an ADU shall not exceed 16’. However, ADUs attached to the primary dwelling are subject to the height requirements of the primary dwelling and may allow for a 2-story ADU.
Also, per recent state law change, detached ADUs within half a mile of major transit stops or high-quality transit corridors can be 18 feet tall. An additional 2 feet can be added if the ADU’s roof pitch matches the primary dwelling.
Read more about two story ADUs and height limits.
How big can an attached ADU be in Coronado?
The floor area of an attached or detached ADU shall not exceed 850 square feet for a studio or one bedroom or 1,000 square feet for a unit that contains more than one bedroom.
What are the requirements of the exterior of the ADU?
An ADU shall utilize the same architectural style, exterior materials, and colors as the existing or proposed primary dwelling, and the quality of the materials shall be the same or exceed that of the primary dwelling.
Setbacks
What is the setback requirement for an ADU in Coronado?
ADUs must have 4′ minimum setbacks, or the applicable setback for the zone district, whichever is less, from rear and side-yard property lines. The front yard no longer has setbacks, pursuant to state law amendments as of September 2022. An ADU taking advantage of the 4′ setbacks cannot exceed a height of 16′. An ADU exceeding 16′ must comply with the setbacks of the underlying zoning. In all cases, an ADU shall comply with the required coastal bluff setback in the Coastal Bluff Overlay Zone and the required Beach reservation.
Initiative setback in the Beach Overlay Zone: Properties located between the ocean and the 1st public roadway shall comply with the street yard setback of the applicable zone where necessary to protect public scenic views to the ocean.
What is the minimum distance the ADU must be from existing structures?
The minimum required distance between structures is not applicable, though fire codes may require special materials when closer than 10′.
Additional Requirements
Does Coronado require in-person submission of plans for an ADU?
Yes, Coronado requires in-person submission of applications for an ADU.
Does Coronado require in-person submission of plans for an ADU?
Yes, Coronado requires in-person submission of plans and does not accept digital applications at this time.
Does Coronado require a soils report for an ADU?
No, Coronado does not mandate soils reports for ADUs.
Does Coronado require coastal development permits?
California Gov. Code § 65852.2 provides that the ADU statutes do not supersede or in any way alter or lessen the effect or application of the California Coastal Act, except that the city shall not be required to hold public hearings for Coastal Development Permit applications for ADUs. Because the city has an approved Local Coastal Development Plan, all permits are the same and no separate CDP is required.
Read more about ADUs in the coastal zone.
Can you rent out an ADU in Coronado?
Accessory dwelling units shall only be used for rentals of terms of six consecutive months or more in Coronado.
Multifamily
How many ADUs does Coronado allow for multifamily properties?
Multifamily property owners are permitted to build as many ADUs as there are existing units, with a maximum of eight detached ADUs. This change is due to California state law and will pre-empt existing local laws that are not brought into conformance.
Additionally, a minimum of one accessory dwelling unit, or up to 25 percent of the existing multifamily units, is permitted within an existing multifamily dwelling, as a result of the conversion of non-habitable space including, but not limited to, storage rooms, boiler rooms, passageways, attics, basements, or garages.
Can you stack detached ADUs on top of each other?
No, you cannot stack ADUs on top of each other in Coronado. The height limit for multifamily is 16′.
Can you attach two ADUs to each other in Coronado?
No, you cannot attach two ADUs to each other in Coronado.
Can you convert existing space to an ADU?
Yes, existing non-livable space may be converted to ADUs (e.g. storage areas and garages). The minimum number of ADU conversions allowed is one, up to a maximum equal to 25% of the number of existing multifamily units. This is in addition to the allowed number of detached ADUs.
Parking
What is the parking requirement for an ADU in Coronado?
The City’s Certified Local Coastal Program (LCP), approved in 1983, mandates certain parking requirements to be met, including the number of off-street parking spaces for dwellings, to ensure and maintain public access to the coast. The California Coastal Act of 1976 is neither superseded nor in any way altered or lessened as provided for in Government Code Section 65852.2(I).
To ensure compliance with the California Coastal Act of 1976 and the approved LCP, a maximum of one (1) parking space shall be required for each accessory dwelling unit. No additional parking is required for a JADU.
Effective Jan 2025 (SB1211): When a garage, carport, covered parking structure, or uncovered parking space is demolished or converted for construction of an ADU, replacement parking will not be required.
Where can a parking space be located?
If a parking space is required, it may be located within the side and rear setbacks and in an existing driveway as tandem parking. ADU parking within the front yard setback area is limited to within an existing driveway. If an ADU or JADU replaces an existing garage or other required parking, replacement spaces shall be provided.
Additional Coronado ADU Regulation Resources
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About SnapADU
Since 2020, we’ve focused exclusively on designing, permitting, and building over 100 ADUs in San Diego. Our deep experience means we catch what others might miss, and our in-house team ensures every promise is delivered.
Learn MoreHow much will an ADU rent for in Coronado?
Below are median rental prices by zip code and bedroom count. Be sure to run comps for your specific area or check with a realtor.
RENT RATES IN CORONADO
| Zip | City | Neighborhood | 1BR | 2BR | 3BR |
| 92118 | Coronado | Coronado | 3745 | 4395 | 5250 |
Source: Rentometer March 2026. Note: Because ADUs are still a relatively small portion of the rental market, many comparables come from apartments, condos, or single-family homes. Smaller ADUs are usually compared to apartments, while larger ADUs are often compared to single-family homes. New construction ADUs may be able to command slightly higher rents than older apartment units.