Accessory Dwelling Units (ADUs) have gained significant popularity in California as a flexible, affordable housing solution. With the state’s ongoing housing crisis, ADUs offer homeowners a way to create additional living spaces on their properties while generating rental income, accommodating family members, or increasing property value.
Whether you are considering building an ADU attached to your main house, creating a freestanding unit or converting your existing garage into an additional unit, this guide will walk you through everything you need to know before you set your plans into motion.
Is Your Property Eligible for an ADU in California?
Most properties in California are eligible to build an ADU, as long as they meet zoning requirements. However, properties in certain areas like historic districts, fire hazard zones, or environmentally sensitive areas may face additional restrictions.
Do you Need a Permit for an ADU in California?
Yes, you need a permit to build an ADU (Accessory Dwelling Unit) in California. The process typically involves submitting plans to your local building department for approval and ensuring that your ADU meets state and local building codes. Permits are required for both new construction and conversions of existing spaces like garages into ADUs.
How Many Bedrooms Can an ADU Have?
The number of bedrooms an ADU can have varies based on the size of the unit and local zoning laws. In general, ADUs can have up to two or three bedrooms, depending on the total square footage. Larger ADUs, especially those closer to the maximum allowable size (usually 1,200 square feet), can typically accommodate more bedrooms.
Can I Convert my Garage into an ADU in California?
Yes, converting a garage into an ADU is permitted under California’s regulations. Garage conversions are a popular option and must comply with local building codes and zoning regulations. This includes obtaining the necessary permits and ensuring the converted space meets safety standards such as ventilation, lighting, and plumbing. Check with your local planning department for specific requirements and procedures.
What are the New Laws for ADUs in California in 2024?
In 2024, California continues to support and encourage the construction of ADUs through laws that streamline the permitting process. Key changes include improved flexibility in parking requirements, allowing more ADUs on multi-family properties, and further simplifying regulations to prevent local ordinances from imposing excessive restrictions. For specific updates, it’s essential to review local city ordinances, as they may have additional or modified requirements.
What is the Size Limit for a Junior ADU in California?
A Junior ADU (JADU) in California is limited to 500 square feet. These units are typically created within the existing footprint of a single-family home, such as converting a bedroom or a garage space into a smaller living unit.
Does a junior ADU need a bathroom?
Yes, a Junior ADU must have access to a bathroom, but it does not necessarily need to have a separate one. A JADU can either have its own bathroom or share a bathroom with the main residence, as long as the necessary plumbing and access requirements are met.
What is a Good Size for an ADU?
A good size for an ADU depends on its intended use and available lot space. For a comfortable one-bedroom ADU, 500–600 square feet is often sufficient. For a two-bedroom unit, 800–1,200 square feet is ideal, providing enough space for living areas without feeling cramped. Ultimately, the size should align with local zoning regulations and the functional needs of the occupants.
Are There any Parking Requirements for ADUs in California?
Parking requirements for ADUs in California have been largely relaxed due to recent state legislation. In many cases, no additional parking is required, particularly if the property is near public transportation or in high-density areas. However, local jurisdictions may still impose parking requirements in certain areas. To determine the specific parking regulations for your ADU, consult your city or county planning department.
What are the Setback Requirements for Building an ADU in California?
California mandates that newly constructed ADUs must have a setback of at least 4 feet from the side and rear property lines. However, converted structures like garages may not need to meet these setback requirements.
What is the Minimum Lot Size for an ADU in California?
California law does not impose a minimum lot size for ADUs. As long as the ADU can meet setback and zoning requirements, property owners can build an ADU regardless of lot size. However, some local jurisdictions may have additional requirements that need to be considered.
How Many Square Feet is a Two-Bedroom ADU?
A two-bedroom ADU typically ranges between 800 and 1,200 square feet, depending on the design and layout. The exact size may vary based on the available space and local zoning regulations, but 1,000 square feet is a common size for a comfortable two-bedroom ADU.
Can an ADU be Larger than the Primary Residence?
No, an ADU cannot generally be larger than the primary residence. In most cases, the maximum allowable size for an ADU is limited to 1,200 square feet, while the size of the primary residence may be larger. Some jurisdictions may allow exceptions, but typically the ADU must be smaller.
Do I Need a Separate Utility Connection for My ADU in California?
It depends on local regulations. While some municipalities require separate utility connections for water, sewer, and electricity, others allow ADUs to share existing utilities with the primary residence.
Are There Height Restrictions for ADUs?
Yes, most cities limit the height of detached ADUs to one or two stories, with height restrictions typically ranging from 16 to 25 feet depending on local zoning laws.
Can I Build a 2 Story ADU in California?
Yes, two-story ADUs are allowed in California, but are subject to specific regulations. State laws generally allow for multi-story ADUs, but local zoning codes and height restrictions will dictate whether a two-story ADU is permissible on your property. These regulations can vary by city or county, so it’s advisable to consult with your local planning department to ensure your design complies with all applicable rules and obtain the necessary permits before proceeding with construction.
How Much Does it Cost to Get an ADU Permit in California?
The cost of obtaining an ADU (Accessory Dwelling Unit) permit in California can range from $1,000 to $8,000, depending on factors like the location, size, and complexity of the project. Fees may include plan review, impact fees, and utility connection charges. Some cities may waive or reduce fees to encourage ADU construction. It’s important to check with your local jurisdiction for specific permit requirements and associated costs.
Is it More Expensive to Get a Permit for a Detached ADU Versus a Garage Conversion?
Yes, obtaining a permit for a detached ADU is generally more expensive than a garage conversion. This is primarily because a detached ADU is treated as new construction, requiring a separate foundation, utility connections, and adherence to more extensive zoning and building regulations. The permit fees for a detached unit typically reflect the added complexity and scope of work involved. In contrast, garage conversions often cost less because the structure already exists, reducing the need for substantial groundwork, infrastructure, and materials.
Can I Build an ADU in a Historic District or Special Zoning Area?
Building an ADU in a historic district or special zoning area, like hillside zones, may require additional reviews and approvals, and you might face stricter design and size regulations to preserve the character of the neighborhood.
Can I Build More than One ADU on My Property in California?
Yes, in California, most properties are allowed to have one full-size ADU and one Junior ADU (JADU), provided the property meets local zoning requirements. However, additional restrictions may apply in certain areas, like historic districts or environmentally sensitive zones. Local governments may also have their own specific regulations, so it’s important to check with your city’s planning department before starting an ADU project.
Who is Eligible for the ADU Grant in California?
Eligibility for ADU grants in California typically depends on specific program requirements, which can vary by locality. Generally, homeowners who meet income qualifications, own their property, and plan to build or upgrade an ADU may be eligible. Some programs focus on increasing affordable housing or enhancing energy efficiency, so aligning your project with these goals can also be beneficial. To determine eligibility, check with local housing authorities or grant programs for detailed criteria and application procedures.
Is Owner-Occupancy Required with an ADU in California?
Under current California law, there are no owner-occupancy requirements for ADUs built between January 1, 2020, and January 1, 2025. This means homeowners are not required to live on the property if they wish to rent out either the ADU or the primary residence.
Let Us Build Your Dream ADU
ADUs are transforming the housing landscape across California, and now it’s your turn.
No matter what the type and size of ADU you are planning to build on your property, you can trust us to create a unit that is fully functional, aesthetically pleasing and up to the code.
Schedule a consultation with us today to discuss your ADU plans.
