Understanding ADU laws is crucial when planning to build an Accessory Dwelling Unit (ADU). These regulations cover everything from size, height, and setbacks to usage and parking. Whether you’re looking to expand your living space or create a rental unit, being well-informed will ensure a smooth, compliant building process.
At Castillo Remodeling, we not only offer expert ADU construction but also ensure that your unit meets local ADU regulations. With our deep knowledge of building codes, you can rest assured that your ADU will be functional, aesthetically pleasing, and fully compliant.
ADU laws in Palo Alto are designed to provide guidelines for homeowners looking to add more livable space while maintaining the city’s architectural and neighborhood standards. Here’s what you need to know:
In Palo Alto, you have two primary options when it comes to converting space into an ADU:
Full Conversion of an Existing Structure: You can convert an existing space, such as a garage, basement, or other accessory structures, into an ADU. This makes use of the current building footprint.
Hybrid Conversion: In some cases, you may choose to convert a space but also add new square footage. This option requires adherence to the ADU regulations for new constructions, such as setback and height limits. The law also allows up to 150 additional square feet for ingress and egress without classifying the project as a hybrid conversion.
Palo Alto’s ADU size and height regulations are essential for maintaining neighborhood harmony. Here are the specifics:
| Type of ADU | Maximum Size | Maximum Height |
| Conversion of Space Within Single-Family Home | No max size | No max height |
| Attached ADU in Proposed Single-Family Home | No max size | Follows main home |
| New Detached ADU Construction | 800 sq. ft | 16 ft |
| Conversion of Non-Habitable Multi-Family Space | No max size | No max height |
| Detached ADU for Multi-Family Homes | 800 sq. ft | 16 ft |
For a typical single-family residence, if you are converting your garage into a detached ADU, the maximum size cannot exceed 800 square feet and the height is restricted to 16 feet. However, if you are adding the ADU within the existing home structure, no size or height restrictions apply as long as the ADU remains within the original footprint.
California’s push towards more sustainable housing has also shaped some of the ADU laws. The state encourages homeowners to incorporate green building practices, such as energy-efficient appliances, solar power, and eco-friendly materials, which not only comply with local regulations but also help reduce environmental impact.
Partnering with a professional contractor simplifies the entire ADU construction process. At Castillo Remodeling, we bring a blend of creativity, expertise, and compliance knowledge to ensure your ADU is built on time, to code, and within your budget. Ready to explore the possibilities for your ADU project? Contact us today to start the journey.
When applicable, the setback should be 4 feet from the side and rear lot lines. Front setbacks follow regulations and guidelines set by local zoning ordinances and Lot Coverage
There are no requirements for parking for ADU in Palo Alto. However, Junior ADU built from an existing attached garage may need to provide replacement parking as uncovered spaces. This may include spaces such as the front or street side yard setback.
Yes, there are design review processes for ADUs in Palo Alto. The City of Palo Alto requires a design review by the Planning and Development department. The design review process involves a thorough evaluation of the proposed ADU’s architectural design, materials, scale, and compatibility with the existing structures in the neighborhood.
Short-term rental of ADU for less than 30 days is prohibited in Palo Alto. If you wish to rent your ADU in Palo Alto, you may need to rent it for the long term.
