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ADU Regulations and Zoning in San Diego County

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Understanding ADU rules in San Diego County

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Navigating the intricacies of ADU zoning regulations in San Diego County requires a comprehensive understanding of the specific rules governing construction on your property. San Diego County regulations meticulously detail criteria such as ADU size, setback requirements, and height specifications. The success of your ADU project hinges on a nuanced comprehension of these regulations, which are subject to the distinct municipal laws applicable to your property's location.

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Basic ADU Regulations in San Diego County

Our guide on San Diego County ADU regulations provides detailed information about the building requirements for different types of ADUs. Read below to get all the necessary information.

In San Diego County, properties designated for both single-family and multi-family purposes might meet the criteria necessary for the construction of Accessory Dwelling Units (ADUs).

It is essential to consult the specific ADU zoning regulations applicable to your jurisdiction to ensure compliance. ADU zoning regulations typically address factors such as ADU size, setback requirements, height specifications, and other relevant guidelines. By understanding and adhering to the appropriate zoning regulations, property owners can determine the feasibility and eligibility of constructing ADUs on their designated properties, promoting informed decision-making in the pursuit of additional dwelling unit development.

If you need help navigating and understanding ADU zoning regulations for your jurisdiction feel free to book a quick consultation to get more detailed information or send an email to [email protected]

Number of ADUs allowed in San Diego County

Two. Within San Diego County, a single-family dwelling is allowed to have one ADU and/or one Junior ADU (JADU).

– Only structures/rooms within the existing or proposed multifamily complex that are not used as livable space, including, but not limited to, storage rooms, boiler rooms, passageways, attics, basements, or garages, can potentially be converted at least into one ADU, or multiple ADU’s, up to 25% of the existing multifamily dwelling units.

– Up to two detached ADU’s may be permitted, per lot that has an existing or proposed multifamily complex if the following requirements are met.

The addition of two detached ADU’s is not subject to any nonconforming regulations.
A non-conforming multifamily complex can have up to two detached ADU’s or may haveADU’s created   within the existing multifamily complex (not both) and would be subject to all other regulations.

– Multiple ADU’s for multifamily complexes do not qualify for the County Fee Wavier Program.

ADU Dimensions and Construction Limitations in San Diego County

Attached ADUs in San Diego County can have a maximum size of 1,200 sq. ft. or 50% of the floor area of your primary dwelling, whichever is greater.

Detached ADUs in San Diego can have a maximum size of 1,200 sq. ft. regardless of the size of the primary dwelling.

In San Diego County, attached accessory dwelling units shall conform to the height limits of the zone, except that an accessory dwelling unit 16 feet in height shall be allowed regardless of the applicable height limit.

In San Diego County, a detached ADU is limited to 25 feet in height.

Consistency in exterior features, including roofing, trim, walls, windows, and color palette, between the ADU and the primary dwelling unit is required.

ADU Setbacks Requirements in San Diego County

Attached ADUs are expected to conform to the setback regulations that are applicable to the primary dwelling.

For all newly constructed detached ADUs, the following guidelines must be observed:

A minimum of 4 ft. setbacks from the property line in the front yard, side yard, and rear yard is required.
On corner lots, exterior side yard setbacks of at least 4 ft. from the edge of the easement, street, or property line are necessary.
ADUs that are 800 sq. ft. or smaller may encroach into the front yard setbacks, but this allowance is subject to the discretion of the County. Zero lot lines will not be allowed if there is available space to move back from the property line.

No setbacks are required if an existing and permitted accessory structure or a portion thereof is being converted into an ADU, except for fire safety.

ADUs constructed above garages and two-story ADUs must maintain side and rear setbacks of 5 ft. Furthermore, existing backyard and side yard structures should maintain distances of 6 ft. between them and 4 ft. from eave to eave.

Parking Requirements for ADUs in San Diego County

For an ADU, a single parking space can be designated. This parking space can be situated within the setback areas or integrated into an existing driveway as tandem parking. If parking spaces are removed to construct an ADU or transformed into one, they do not need to be replaced.

An ADU does not require a parking space if:

It is situated within a one-half mile radius of public transportation or within one block of a car-share location.
It is located in an architecturally and historically significant district.
It is part of the existing primary residence or an accessory structure.
It is situated within one block of a car-share vehicle.
It is in an area where on-street parking permits are mandated but not made available to the occupant of the ADU.

ADU Occupancy Requirements in San Diego County

Cities don’t require owner occupancy until 2025. However, should a property have both an ADU and JADU, JADU law requires owner-occupancy of either the newly created JADU, or the single-family residence.

ADU may be rented but is not intended for sale separate from the primary residence.
The ADU shall not be used or rented for less than 30 days.
The JADU may be rented, but not for less than 30 days, and is not intended for sale separate from the primary residence. The owner is required to live in one of the two units.

*Source: https://www.sandiegocounty.gov/content/dam/sdc/pds/zoning/formfields/PDS-PLN-611.pdf

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San Diego County, California

Areas of Coverage in San Diego County

To learn more about ADUs in your area, select your city from the list.

Carlsbad
Chula Vista
Coronado
Del Mar
El Cajon
Encinitas

Escondido
Imperial Beach
La Mesa
Lemon Grove
National City
Oceanside

Poway
San Diego City
San Marcos
Santee
Solana Beach
Vista

If your city isn't listed, no problem! Contact us to discuss your project; we might still be able to assist you.

Need help with the regulations applicable to your property? Our team at Multitaskr is always ready to assist you. Schedule a call with one of our Home Solution Experts today!

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Frequently Asked Questions

The following list of frequently asked questions on ADUs might provide the answers regarding financing, zoning feasibility, city regulations, site preparation and construction.

What is an ADU?

An Accessory Dwelling Unit (ADU) is an additional or secondary residential dwelling, either attached or detached, located on the same lot as the primary residence.

What types of ADUs are allowed to be built in San Diego County?

1) Detached: Are standalone structures separated from the main residence. 2) Attached: Are integrated into the primary dwelling. 3) Garage Conversion: Consists of turning an existing garage into a fully equipped living space. 4) JADU: Are independent units up to 500 square feet, located within existing homes.

How much time is required to plan, design, and construct an ADU?

The timeframe can fluctuate depending on various factors, such as the chosen design, construction process, and the scheduling availability of your builder.

What is the price range for an ADU?

The cost of an ADU can vary significantly, taking into account factors such as the ADU's dimensions, design, construction, and the expenses associated with materials and labor.

What are the reasons for considering an ADU as an investment?

Rental Income, Property Value Appreciation, Housing for Family, Friends, or Caregivers and, Opportunity for Downsizing within Your Community.

What are the financing options available for ADU construction?

An Accessory Dwelling Unit (ADU) can be financed through various means depending on your financial situation and preferences. Contact us today to discuss your options and find the best solution.

If you have any further inquiries, please contact us at [email protected] or give us a call at (619) 514-4023. We will be happy to assist you.

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Feasibility

Our team will help you understand the potential of your property and identify the best location for your Accessory Dwelling Unit.

Design

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Permitting

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Construction