| Table of Contents |
| 1. Understanding San Francisco ADU Laws |
2. Types of ADUs in San Francisco |
| 3. ADU Regulations and Requirements |
| 4. Permit Process and Timeline |
| 5. Cost Considerations |
| 6. FAQ |
Understanding San Francisco ADU Laws
Accessory Dwelling Units (ADUs), commonly known as granny flats or in-law units, are secondary housing units located on the same lot as a primary residence. In San Francisco, ADUs are seen as a solution to the city's housing shortage, offering homeowners opportunities for rental income, multi-generational living, or additional space.
Types of ADUs in San Francisco
San Francisco ADU permits have several types:
Conversion ADUs: Transforming existing spaces like basements, garages, or attics into habitable units.
Detached ADUs: New, standalone structures built in the rear yard or side yard.
Attached ADUs: Extensions or additions to the existing primary residence.
Each type has specific requirements and benefits. For instance, conversion ADUs may be eligible for expedited permitting processes, while detached ADUs offer more privacy and independence.
ADU Regulations and Requirements
San Francisco's ADU regulations are designed to balance housing needs with neighborhood character and safety. Key requirements include:
Size Limits: ADUs must be at least 150 square feet and can be up to 1,200 square feet, depending on the type and zoning.
Setbacks: Typically, a 4-foot setback from side and rear property lines is required.
Height Restrictions: ADUs generally cannot exceed 16 feet in height.
Parking Requirements: No additional parking is required if the ADU is within half a mile of public transit or if it's a garage conversion.
Natural Light and Ventilation: ADUs must have windows for natural light and ventilation, with specific size and placement requirements.
Permit Process and Timeline
The permit process for constructing an ADU in San Francisco involves several steps:
Pre-Application Consultation: Engage with the Planning Department to discuss your project and understand zoning and code requirements.
Submit Application: Provide detailed plans, including site plans, floor plans, and structural details.
Review and Approval: The Planning Department reviews the application for compliance with zoning and building codes.
Permit Issuance: Once approved, permits are issued, and construction can begin.
The typical timeline for obtaining an ADU permit in San Francisco is between 5 to 10 months, depending on the complexity of the project and any required reviews.
Learn more about How to Get an ADU Permit in San Francisco
Cost Considerations
The cost of building an ADU in San Francisco can vary widely based on size, design, and construction methods. On average, homeowners can expect to spend between $200,000 and $500,000. Prefabricated or modular ADUs may offer more affordable options, starting at mid-$200,000.
