Accessory Dwelling Units (ADUs) are rising in popularity across Los Angeles County, and for good reason. These small, secondary homes can provide additional living space for family members, generate rental income, and contribute to the region's affordable housing stock. However, navigating the regulations and development standards for ADUs can be complex. This guide aims to simplify the process and help homeowners understand the key requirements and benefits of building an ADU in Los Angeles County.
What is an ADU?
An Accessory Dwelling Unit (ADU) is a smaller, secondary residential unit located on the same lot as a primary single-family or multi-family home. ADUs can be attached to the main residence, detached, or repurposed from existing space such as a garage. There's also a smaller version known as a Junior Accessory Dwelling Unit (JADU), which is contained within the walls of an existing single-family home.
Why Consider an ADU?
ADUs offer numerous benefits:
Additional Income: Renting out your ADU can provide a steady stream of rental income.
Flexibility: Provides additional living space for family members or guests.
Increased Property Value: Can increase the market value of your property.
Affordable Housing: Contributes to the local affordable housing supply.
Permitted and Non-Permitted ADUs
An ADU is Permitted if:
The property is zoned to allow a Single-Family Residence (SFR) or Multi-Family Residence (MFR).
A legal SFR or MFR exists on the property or is proposed to be built concurrently with the ADU(s).
An ADU is Not Permitted if:
The property is not zoned to allow an SFR or MFR.
The property is located in a Very High Fire Hazard Severity Zone (VHFHSZ) and does not have two means of access to a highway.
Development Standards for ADUs
Los Angeles County has specific requirements for building ADUs, based on zoning, size, setbacks, and other factors. Here's a comprehensive breakdown:
General Requirements
Zoning: The property must be zoned to allow single-family or multi-family residences.
Existing Structures: A legal single-family or multi-family residence must exist on the property or be proposed to be built concurrently with the ADU.
Prohibited Areas
Zoning Restrictions: ADUs are not permitted on properties not zoned for single-family or multi-family residences.
Very High Fire Hazard Severity Zones (VHFHSZ): ADUs are not permitted in these areas unless the property has two means of access to a highway, each at least 24 feet wide and unobstructed.
Size Limitations
Attached ADUs:
Conversion within existing single-family residence or new construction
Maximum size is 50% of the existing residence or 1,200 sq. ft., whichever is less
Detached ADUs:
Maximum size is 1,200 sq. ft.
Junior ADUs (JADUs):
Maximum size is 500 sq. ft.
Setback Requirements
Attached ADUs:
Front setbacks follow Title 22 regulations.
Side and rear setbacks are 4 feet.
Detached ADUs:
Side and rear setbacks are 4 feet.
No setbacks are required for ADUs converted entirely from existing space or constructed in the same location with the same dimensions as the existing structure.
Height Restrictions
Attached ADUs:
Height cannot exceed 25 feet or as specified by local plans.
Detached ADUs:
Height cannot exceed 16 feet, with some exceptions allowing up to 18 or 20 feet depending on location and circumstances.
Parking Requirements
No Replacement Parking is required when a garage or carport is converted into an ADU.
Uncovered Parking is required for ADUs in VHFHSZ unless certain exemptions apply (e.g., within ½ mile of public transit).
Parking Dimensions must be 8 ½ ft. x 18 ft.; compact parking is not allowed.
A homeowners in Los Angeles, added a detached ADU to their property. They rent it out, providing them with an additional income stream that helps cover their mortgage. The ADU also serves as a guesthouse for visiting family members.
Case Study 2:
A family converted their garage into a JADU to accommodate their aging parents. This solution allows the family to stay close while maintaining privacy and independence for everyone.
Future Outlook
The future of ADU development in Los Angeles County looks promising. With ongoing efforts to address affordable housing and sustainable urban development, we can expect further support for ADUs. Potential changes may include streamlined permitting processes and incentives for green building practices.
Conclusion
Building an ADU in Los Angeles County can be a rewarding venture, whether you’re looking to generate rental income, create additional living space, or contribute to affordable housing. If you’re considering building an ADU, we encourage you to explore the possibilities and resources available.
Ready to start your ADU project? Schedule a call with our experts today for a consultation and take the first step towards maximizing your property’s potential. Learn more about ADU regulations and get started with expert advice tailored to your needs.
