ADU Regulations


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A knowledgeable ADU builder in Coronado is essential for a successful build.


Understanding the intricacies of ADU regulations in Coronado is essential for property owners looking to add accessory dwelling units to their properties. Whether for rental income, accommodating family members, or increasing property value, navigating local regulations ensures compliance and a smooth development process.

Essential ADU Rules for Coronado

What you can build

  • Maximum Sizes

    Detached ADUs up to 850 sqft for 1 bedroom and 1000 sqft for 2+ bedrooms. ADUs up to 800 sqft are exempt from lot coverage limitations.
  • Setbacks

    Minimum 4-foot setback from side and rear property lines.
  • Two-Story

    Two-story ADUs are not permitted in Coronado.
  • Building Separation

    Minimum of 10 feet is required.

Permitting timeline

  • Permitting Timeframe

    4-6 months.
  • Coastal

    Required for ADUs in coastal zones.

Coronado ADU Regulatory Overview

Coronado’s ADU regulations are governed by local zoning laws, design criteria, and building standards. Zoning laws determine where ADUs can be built, while design criteria ensure they blend seamlessly with the main residence and surrounding properties. Building standards encompass construction requirements to guarantee safety, durability, and compliance with relevant codes.

Coronado ADU Permitting Process

Obtaining an ADU permit in Coronado involves several key steps:

  • Document Preparation

Gather required documents, including architectural plans, site surveys, and ADU permit applications.

  • Submission

Submit ADU permit applications, which may require in-person submission for review by city officials.

  • Review and Approval

City authorities assess applications for compliance with zoning laws, building codes, and other regulations.

  • Inspection

Upon approval, inspections are conducted at various stages of construction to ensure adherence to approved plans.

  • Final Approval

Once all inspections are passed, final approval is granted, allowing occupancy of the ADU.

ADU Local Zoning in Coronado

ADUs must maintain a 4-foot minimum setback from rear and side-yard property lines, or adhere to the setback requirements of the zone district, whichever is less. Front yards are now exempt from setbacks. ADUs utilizing the 4-foot setbacks cannot exceed 16 feet in height; those surpassing 16 feet must comply with the zoning setbacks. Additionally, ADUs must adhere to required coastal bluff setbacks and beach reservations. In the Beach Overlay Zone, properties between the ocean and the first public roadway must observe street yard setbacks to preserve public scenic views of the ocean.

Coronado does not impose a minimum lot size requirement for the construction of ADUs. This flexibility allows property owners of various lot sizes to consider adding ADUs, provided they comply with other local zoning and building regulations.

Yes, Coastal Development Permits are necessary for ADUs in Coronado, as the city follows an approved Local Coastal Development Plan.

Separate mailing addresses for ADUs in Coronado are possible through coordination with the city’s Building Division and the United States Postal Service (USPS). The process involves submitting a request to the city and providing the necessary documentation to the USPS.

The City’s Certified Local Coastal Program (LCP), established in 1983, mandates parking requirements to maintain coastal access. In compliance with the California Coastal Act of 1976 and the approved LCP, one parking space is required for each accessory dwelling unit (ADU), with no extra parking needed for a Junior Accessory Dwelling Unit (JADU).

Water and sewer connections for ADUs in Coronado must follow the city’s plumbing codes. Shared connections with the primary residence are allowed, and connection fees should be proportionate to the ADU’s impact on the municipal system.

Coronado ADU Building Codes

A Building Verification Survey is not specifically required for all ADU projects in Coronado. However, compliance with zoning and building codes is mandatory, and some projects may require a survey based on specific circumstances or requirements.

While Coronado does not specifically require stormwater mitigation measures for all ADU projects, it’s essential to comply with any applicable environmental regulations. Property owners should consult with the city’s planning department for specific requirements based on the ADU’s location and design.

The ADU permitting process in Coronado involves several steps: pre-application consultation, application submission with required documents and plans, plan review by the city, obtaining any necessary corrections or approvals, construction, and final inspection to receive a certificate of occupancy.

There are no specific limitations in Coronado restricting ADUs to be used either for family members or as rental income opportunities. ADUs can be rented out, provided they adhere to local rental regulations, including the minimum rental period of six consecutive months.

Yes, ADUs in Coronado can be rented out for long-term housing, subject to local regulations that dictate a minimum rental period of six consecutive months to ensure they contribute to the long-term housing stock.

The addition of an ADU may require adjustments to a property’s insurance coverage. Property owners should consult with their insurance providers to ensure the ADU is covered and to understand any changes to their premiums or policy terms.

Finalizing Your ADU in Coronado

Coronado’s ADU development process involves thorough submission of documents, verification of compliance with regulations, consideration of parking arrangements, determination of usage parameters, and connection to utilities. Ensuring smooth integration of the ADU into the property requires careful planning and adherence to city requirements.

Calculate Your ADU Cost in Coronado

Using the tool below, you will be able to calculate your investment based on the type and size of the ADU you are interested in building on your property.

Attached ADU


Estimated Cost


*The costs we are calculating here are an average for time and materials. This calculator is meant to provide an estimate to educate you on the ADU building process, please note that this is not a final quote.

Detached ADU


Estimated Cost


*The costs we are calculating here are an average for time and materials. This calculator is meant to provide an estimate to educate you on the ADU building process, please note that this is not a final quote.

Garage ADU


Estimated Cost


*The costs we are calculating here are an average for time and materials. This calculator is meant to provide an estimate to educate you on the ADU building process, please note that this is not a final quote.
Discover more


Navigating ADU regulations in Coronado is essential for property owners seeking to maximize their property’s potential while complying with local laws. Understanding key rules, such as size limits, setbacks, and permitting processes, is crucial for a successful ADU project. Property owners are encouraged to consult with local planning authorities or legal professionals for tailored advice and guidance throughout the development process.


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