The City of Sausalito permits ADUs across most residential zones. Sausalito follows both state and local ADU laws, allowing most single-family homes to build one detached ADU and one Junior ADU (JADU) per lot. Multi-family properties may be eligible for multiple ADUs, depending on site conditions.

Sausalito aligns with California’s broader ADU legislation but has its own requirements for height, setbacks, and design review.

• Detached ADU: A new construction ADU that is physically detached from the primary dwelling
• Attached ADU: A new construction ADU that shares walls and is attached to the primary dwelling
• Conversion ADU: Existing space within the primary home, such as a bedroom or garage, converted into an independent living unit
• Junior ADU (JADU): A JADU is 500 square feet or less, contains an efficiency kitchen, and sanitation facilities may be provided in the unit or shared with the residence

• Maximum Size:
  
  • Detached: maximum size 1000 sf
  • Attached: Up to 1,000 sq ft or 50% of the primary dwelling’s floor area, whichever is less
• Setbacks:
  
  • Maximum A maximum of 4 feet from the rear and side property lines
• Height Limits:
  
  • Detached ADU: The height of a detached ADU is limited to 16 feet, or up to 25 feet if constructed above a garage
  • Attached ADUs: Attached ADUs may reach a maximum height of 25 feet
• Parking Requirements:
  
  • Additional parking is not required if the ADU is:
    
    • Within a Historic District
    • Within one block of a designated car share parking space
    • Within ½ mile walking distance of a public transit stop

To build an ADU in Sausalito, applicants must complete:

• Zoning compliance review: Confirms the ADU complies with Sausalito zoning standards for lot eligibility, size (up to 1,000 sq ft), height (16–25 ft), and 4-ft side and rear setbacks
• Site plan and elevations: Must show lot boundaries, existing/proposed structures, ADU location, access, parking, grading (if any), and height details
• Architectural drawings: Provide detailed plans and elevations showing compliance with local design, fire safety, and building codes
• Structural calculations and engineering: Required for all new ADUs to meet building, fire, hillside, and seismic safety codes
  

Homeowners should also review Sausalito’s current fee schedule, utility connection requirements, and fire code compliance.

Sausalito does not have a fixed ADU review timeline; however, state law requires the city to issue a decision within 60 days of receiving a complete application. Review times can vary depending on project complexity, hillside or seismic review, and completeness of submitted plans. Incomplete applications or missing reports may delay processing. Using accurate, code-compliant plans and early consultations with city staff can help expedite approval.

ADUs are allowed on lots with an existing or proposed primary dwelling in any residential zoning district within the City of Sausalito. There is no minimum lot size requirement. ADUs must comply with applicable height, setback, and lot coverage standards, as well as hillside and seismic safety regulations. Properties with unpermitted structures or active code violations are not eligible. Lots located within the Coastal Zone or other environmentally sensitive or steep-slope areas may require additional review or permits.

For the most current and complete information, refer directly to the City of Sausalito.