Palo Alto ADU laws are meant to guide you when building your ADU within the city. These laws outline the standard way to build an ADU from size to height to setbacks.
If you are on the move to building an ADU in Palo Alto, Castillo Remodeling is the perfect contractor to work with. We have the experience and skills to build a functional and aesthetically pleasing ADU. Even better, we understand Palo Alto ADU laws better than anyone else. So you can be sure your unit will comply with the law.
According to Palo Alto ADU laws, there are two ways to convert a space to build an ADU. These are:
If you decide to build a hybrid ADU, then the standard ADU regulations (such as setbacks) for new units are applied.
Also, an additional area of up to 150 square feet can be added to an existing structure for ingress and egress and not transform the project into a “hybrid conversion.
For a single-family residence, you can build 1 ADU or 1 junior ADU if:
For multi-family homes, you can convert up to 25% of the existing units of non-habitable space within your existing multi-family building. You also add up to 2 detached ADU.
The minimum standard size for ADUs for both attached and detached in Palo Alto is 150sq. This also applies to both single and multi-family residences.
The maximum size for ADU in Palo Alto is as follows:
| Maximum Size | Height | |
| Conversion of Space Within an Existing Single-Family Home or Accessory Structure | N/A | N/A |
| Construction of Attached ADU Within the Space of a Proposed Single-family Home | N/A | within space of Single Family Home |
| New Construction of Detached ADU | 800 sf | 16 |
| Conversion of Non-Habitable Space Within Existing Multi-family Dwelling Structure | N/A | N/A |
| Conversion or Construction of Detached ADU | N/A | 16 |
Working with a contractor will make your ADU construction project seamless and efficient. When you choose Castillo Remodeling, we will bring expertise and experience to the table. We will handle the whole project from initial ADU design to planning to construction and final touches. Working with us means you can have peace of mind knowing that your ADU will be built to code, on schedule, and to your satisfaction. Contact us today, and let’s schedule a meeting.
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.
