Tiny Homes as ADUs

As housing costs rise and sustainable living grows in popularity, movable tiny homes are becoming an innovative solution for affordable housing. Some California counties now recognize movable tiny homes as Accessory Dwelling Units (ADUs), allowing them to be legally placed on residential properties. Here’s an overview of the counties in California that currently allow movable tiny homes as ADUs and what to know if you’re considering this unique option.

1. Los Angeles County

Los Angeles was among the pioneers in California to allow movable tiny homes as ADUs. In 2019, the county passed an ordinance permitting movable tiny homes on residential lots as a part of its larger effort to expand affordable housing options. The requirements for a tiny home ADU in Los Angeles include:

  • Meeting basic safety standards

  • Being permanently connected to utilities

  • Following size and setback regulations as outlined for ADUs in the county

2. San Diego County

San Diego County also allows movable tiny homes as ADUs under its ADU program. Tiny homes must adhere to the county’s ADU regulations, including the following:

  • A maximum size of 500 square feet for a single ADU

  • Compliance with local zoning and safety requirements

  • Being built on a chassis with functional wheels, as required for all movable tiny homes

With its flexibility, San Diego County has become a hotspot for residents interested in adding a tiny home to their property.

3. Santa Cruz County

Santa Cruz has embraced the tiny home movement and permits movable tiny homes as ADUs in residential zones. Residents can place a tiny home on a property as long as they meet local standards for:

  • Building and zoning codes applicable to ADUs

  • Connection to utilities for water, electricity, and sewage

  • Compliance with setbacks and other spatial requirements

Santa Cruz County is known for being environmentally friendly, and movable tiny homes fit well with this ethos, offering a sustainable housing alternative.

4. Fresno County

Fresno made history by becoming one of the first cities in the U.S. to specifically allow tiny homes as backyard ADUs. Fresno County continues to support tiny home ADUs with minimal restrictions, making it ideal for those looking to add a moveable tiny home to their property. Requirements include:

  • Compliance with California building standards for ADUs

  • Connection to utilities, while maintaining the ability to move if necessary

  • Adherence to ADU size and setback rules

5. Placer County

In Placer County, tiny homes are permitted as ADUs under certain conditions. The county is known for its flexible approach to alternative housing, making it appealing for those interested in sustainable and affordable living options. Placer’s requirements include:

  • Size restrictions in line with other ADUs in the area

  • Compliance with fire safety, zoning, and utility connection regulations

  • Certification that the unit is roadworthy, given its movable nature

6. San Luis Obispo County

San Luis Obispo is another forward-thinking county that has embraced movable tiny homes as ADUs. Here, tiny homes can be used as secondary housing units on properties that meet zoning requirements. Requirements include:

  • Meeting California ADU standards and local building codes

  • Connection to water, electricity, and sewer

  • Adherence to the ADU size and placement requirements for residential areas

Additional Counties and Considerations

Other counties, like Sonoma and Humboldt, are exploring ways to incorporate movable tiny homes into their ADU policies as part of broader initiatives to increase affordable housing options. However, rules and restrictions vary widely, so prospective tiny homeowners should consult local zoning laws and housing departments before committing to a property.

What to Know Before Moving Your Tiny Home to California

If you're considering a movable tiny home as an ADU, here are some important steps:

  1. Check Local Zoning Regulations: Regulations can vary widely within counties, and individual cities or towns may have additional requirements or restrictions.

  2. Understand Utility Requirements: Most counties require ADUs to connect to public utilities, which may affect your tiny home’s mobility and placement.

  3. Review Setback and Size Requirements: ADU size limitations often apply to tiny homes, so be sure your unit meets the standards for height, width, and placement.

  4. Stay Updated on Legislation: California’s laws on ADUs and tiny homes are evolving. Staying informed can help you navigate changes or find new counties opening up to tiny home ADUs.

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