Imperial Beach Accessory Dwelling Unit ADU Regulations & Zoning

An ADU Imperial Beach can be up to 1,200 square feet, which is the state maximum. However, local size limitations may apply based on the number of bedrooms and the existing lot size. Specifically, an attached ADU cannot exceed 50% of the existing primary dwelling’s floor area. Regardless of local standards, the City must permit a detached ADU of at least 800 square feet with a 16-foot height limit and 4-foot side/rear setbacks.

• Detached ADUs can be up to 1,200 sq. ft. with standard setbacks.
• Attached ADUs are limited to 50% of the primary residence size or 1,200 sq. ft., whichever is less.
• A Junior Accessory Dwelling Unit (JADU) is limited to 500 sq. ft.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

The setback requirements for a new detached Imperial Beach Accessory Dwelling Unit are significantly reduced compared to standard residential construction. Both the side and rear setbacks are required to be a minimum of 4 feet. The front setback must comply with the underlying zone’s requirement for the main structure, typically around 15 to 20 feet. These reduced requirements enable more homeowners to utilize their backyards for new home construction Imperial Beach.

• 4-foot minimum setback for both side and rear lot lines.
• Front setback is governed by the underlying zoning code, maintaining street presence.
• Existing legally constructed garages converted to an ADU have no new setback requirements.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

For construction Imperial Beach projects involving ADUs, the City has eliminated parking requirements in several key scenarios, as mandated by state law. No parking is required if the Imperial Beach ADU is created within an existing structure, is located within one-half mile walking distance of public transit (bus stop or trolley station), or is part of a car-share vehicle location. If parking is required, only one space is needed per unit.

• No parking is required if the ADU is within 1/2 mile of a bus stop or transit station.
• No parking is required for garage conversions.
• Required parking may be provided as tandem parking on an existing driveway.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

Yes, garage conversions are a popular and cost-effective way to create an ADU Imperial Beach. The City’s regulations are highly supportive of these conversions. The process is streamlined, and a garage conversion ADU is generally exempt from new setback and parking requirements, provided the existing structure is legal. This is often the fastest route for construction Imperial Beach homeowners.

• Conversions within the existing footprint require no new setbacks.
• Conversions are exempt from fire suppression requirements if the primary dwelling is not sprinklered.
• The conversion must still meet building code health and safety standards.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

The maximum height for a newly constructed detached Imperial Beach Accessory Dwelling Unit is typically capped at 16 feet, provided it has a 4-foot minimum setback. If the ADU is attached to the primary residence, the height is generally restricted to that of the primary structure or the underlying zone’s height limit, whichever is less.

• The 16-foot height is standard for detached ADUs with minimal setbacks.
• Exceeding 16 feet may require greater setbacks and potentially discretionary review.
• The height is measured from the adjacent grade to the highest point of the roof.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

The City of Imperial Beach is required by state law to process an application for a conforming ADU Imperial Beach within a 90-day period from the date a complete application is submitted. This “ministerial” review process ensures a quick turnaround compared to standard residential projects that require discretionary review. Having complete plans and documentation is crucial for meeting this timeline.

• The review period starts only when the application is deemed “complete.”
• Missing or incomplete documents can significantly delay the 90-day clock.
• The City does not currently offer pre-approved ADU plans, making custom plan review standard.

Official Sources:
https://www.imperialbeachca.gov/

Yes, under current state and local law, homeowners in Imperial Beach are permitted to construct one full ADU Imperial Beach and one Junior Accessory Dwelling Unit (JADU) on a single-family residential lot. The JADU must be contained within the existing footprint of a proposed or existing single-family structure and includes an exterior entrance and an efficiency kitchen.

• The JADU must be 500 square feet or less.
• The JADU requires owner-occupancy, unlike the main ADU until 2025.
• The JADU must have an interior connection to the primary dwelling.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

To get an ADU permit Imperial Beach, homeowners must first prepare architectural and structural plans for their Imperial Beach Accessory Dwelling Unit. These plans, along with a completed application, site plan, and any necessary engineering reports, are submitted to the City of Imperial Beach Building Division. The review ensures compliance with local zoning and state building codes.

• Start with a pre-application review if available, though not strictly required.
• Submit final plans to the Building Division for the 90-day ministerial review.
• Pay all required development impact fees and permitting fees upon approval.

Official Sources:
https://www.imperialbeachca.gov/

While most development impact fees (DIFs) for ADUs under 750 square feet have been waived statewide, the City of Imperial Beach may charge impact fees for new home construction Imperial Beach ADUs larger than 750 square feet. These fees are proportional to the size of the ADU compared to the primary dwelling. Fees contribute to public services like parks and utilities.

• ADUs less than 750 sq. ft. are generally exempt from all impact fees.
• ADUs 750 sq. ft. or larger may be subject to fees proportional to the unit size.
• School district fees may still apply, regardless of ADU size.

Official Sources:
https://www.imperialbeachca.gov/

Homeowners of an Imperial Beach Accessory Dwelling Unit are prohibited from using the unit for short-term rentals, defined as less than 30 days, which is standard practice in many San Diego coastal communities. Long-term rentals (30 days or more) are fully permitted, providing a valuable source of rental income. This rule promotes long-term housing stability.

• Short-term rentals (less than 30 days) are explicitly disallowed.
• Long-term rentals are encouraged to address the housing shortage.
• Owner-occupancy is not required for the ADU until the state waiver expires in 2025.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

While an ADU Imperial Beach is not required to have separate utility meters for gas, electricity, and water, the City may permit them. If a separate meter is installed, the City cannot require the installation of new or separate utility connection fees, including hook-up fees or capacity charges, which saves the homeowner costs on the construction Imperial Beach project.

• Separate meters are optional but not mandated by the City.
• No new utility hookup fees can be imposed if the ADU is constructed within the existing space.
• Utility service providers (e.g., SDG&E, water) may have specific requirements for installation.

Official Sources:
https://www.imperialbeachca.gov/

Imperial Beach lies entirely within the Coastal Zone, which means construction Imperial Beach projects, including ADUs, must comply with the California Coastal Act and the City’s Local Coastal Program (LCP). Generally, ADUs that meet the standards of Gov. Code §65852.2 are exempt from Coastal Development Permits (CDP), provided they are on a property with an existing single-family residence.

• Conforming ADUs are typically exempt from requiring a CDP.
• Projects that significantly alter the exterior or exceed density limits may require a CDP.
• ADUs must not interfere with coastal access, recreation, or sensitive habitats.

Official Sources:
https://www.imperialbeachca.gov/

A JADU, as defined under Imperial Beach ADU regulations, is a unit of no more than 500 square feet, created within the existing walls of a single-family home. It must include an efficiency kitchen (sink, mini-fridge, cooking appliance), an exterior entrance separate from the main house, and require the owner of the primary home to occupy either the JADU or the main home.

• Limited to a maximum size of 500 square feet.
• Requires owner occupancy of the property (either the JADU or the main house).
• Must have an interior connection to the primary living space.

Official Sources:
https://codelibrary.amlegal.com/codes/imperialbeachca/latest/imperialbeach_ca/0-0-0-12847

While the City of Imperial Beach regulations facilitate ADU Imperial Beach projects, state law supersedes restrictive Homeowners’ Association (HOA) covenants. An HOA cannot prohibit the construction of an ADU Imperial Beach or Imperial Beach Accessory Dwelling Unit if it meets the requirements of Gov. Code §65852.2. They may, however, impose reasonable aesthetic standards (e.g., matching roof tile or paint color)parking requirements, especially near transit.\n- Eligibility includes both single-family and multi-family properties.\n- Fire sprinklers are typically not required unless mandated by the primary home’s status.\n- The maximum number of units on a single-family lot is one ADU and one JADU.\nOfficial