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santa-rosa-ca-adu-guidelines

Accessory Dwelling Unit (ADU) City Regulations

Number of ADUs allowed:

One ADU per one primary unit.

Types of ADUs allowed:

Attached, Detached or junior ADU. Conversion of existing space or new construction permitted.

Lot size:

Lot coverage. An accessory dwelling unit shall comply with the lot coverage requirements of the applicable zoning district.

ADU size:

New detached ADU: No newly constructed detached accessory dwelling unit may contain habitable space in excess of 1,200 square feet.
New attached ADU: No newly constructed attached accessory dwelling unit may contain habitable space in excess of 50% of the existing residential square feet or 1,200 square feet, whichever is less.
The junior accessory dwelling unit shall not exceed 500 square feet in area.

Setbacks:

Residential district. An accessory dwelling unit shall comply with the setback requirements of the applicable residential zoning district for the primary dwelling, except as follows:

  • A new detached single-story accessory dwelling unit in a single-family residential zone shall comply with accessory structure setbacks.
  • A new detached two-story accessory dwelling unit shall comply with primary structure setbacks.
  • A new detached two-story accessory dwelling unit located in a residential small lot subdivision shall comply with the setback requirements.
  • An accessory dwelling unit that is fully contained within the existing space of a single-family residence or accessory structure and has independent exterior access from the existing residence shall provide side and REAR setbacks sufficient for fire safety, as determined by the Santa Rosa Fire Department.
  • No setback shall be required for an existing legally constructed garage or accessory structure that is converted to an accessory dwelling unit. A setback of five feet from the side and rear property lines is required for an accessory dwelling unit constructed above an existing garage.

Parking:

Parking. One off-street parking space is required for an accessory dwelling unit, except as set forth below. The off-street parking shall be permitted uncovered, compact, tandem and in setback areas, unless the review authority determines that tandem parking or parking within a setback is not feasible due to specific site or topographical or fire and life safety conditions.

No off-street parking shall be required if one or more of the following circumstances exist:
The accessory dwelling unit is 750 square feet or less in area.
The accessory dwelling unit is located within one-half mile of public transit.
When on-street parking permits are required but not offered to the occupant of an accessory dwelling unit.
When there is a car share vehicle located within one block of the accessory dwelling unit.
If a garage, carport, or covered parking is demolished or converted in conjunction with the construction of an accessory dwelling unit, replacement parking spaces may be provided in any configuration on the lot, including as uncovered, compact, tandem parking and within a setback area. No replacement parking shall be required if one or more of the following circumstances exist: if property is located either within 1/2 mile of a transit stop, or one block from a car-share vehicle.

Fire Safety:

An automatic fire sprinkler system shall be installed throughout the buildings that exceed 1,200 square feet GROSS floor area. An automatic fire sprinkler system shall be installed throughout all buildings that undergo any combination of substantial remodel, addition, or both that exceed 50% of the existing GROSS floor area.

Shape, materials and style:

Architectural compatibility. If visible from a public street, an accessory dwelling unit shall incorporate the same or substantially similar architectural features, building materials and colors as the primary dwelling unit or compatible dwellings located on adjacent properties.

Height:

Height limit. A one-story accessory dwelling unit shall not exceed a maximum height of feet. A two-story accessory dwelling unit shall not exceed a maximum height of feet.

Design review:

Permit requirements. An application for an accessory dwelling unit that complies with all applicable requirements of this Section shall be approved .
Permit requirements. An application for a junior accessory dwelling unit that complies with all applicable requirements of this Section shall be approved .

Number of Bedrooms:

Not specified by State Standards

Ownership:

Deed restrictions. Prior to occupancy of a junior accessory dwelling unit or an accessory dwelling unit, the property owner shall file with the County Recorder a deed restriction containing a reference to the deed under which the property was acquired by the owner and stating that: The accessory dwelling unit or junior accessory dwelling unit shall be considered legal only so long as either the primary dwelling or the accessory dwelling unit or junior accessory dwelling unit is occupied by the owner of record of the property. Such owner-occupancy, however, shall not be required if the property owner is a governmental agency, land trust or non-profit housing organization; and, The restrictions shall run with the land and be binding upon any successor in ownership of the property. Lack of compliance shall void the approval of the accessory dwelling unit or junior accessory dwelling unit and may result in legal action against the property owner.

The developer of a subdivision that includes accessory dwelling units or junior accessory dwelling units shall record the deed restrictions required by this Subsection prior to the recordation of the Final Map or Parcel Map. Each lot with a accessory dwelling unit or junior accessory dwelling unit shall remain unoccupied until the property transfers ownership, allowing for compliance with the recorded owner-occupancy restriction. The restrictions shall run with the land and be binding upon any successor in ownership of the property. Lack of compliance shall void the approval of the accessory dwelling unit or junior accessory dwelling unit and may result in legal action against the property owner.

Utility connections:

Utility Connection Fees. Except as provided in subsection (b), a separate new utility connection and payment of a connection fee or capacity charge pursuant to State law and City fee schedule will be required for any new accessory dwelling unit. No new or separate utility connection or related connection fee or capacity charge will be required for accessory dwelling units that are internal conversions of existing space within a single family residence or an accessory structure.
Utility Connection Fees. No new or separate utility connection and no connection fee for water sewer, or power is required for a junior accessory dwelling unit.

Historic Requirements:

For properties that are identified as a contributor to the District, through the preparation of a historic resource survey by a qualified professional, the applicant shall demonstrate that the proposed accessory dwelling unit will not negatively impact historic resources on the property, and will be consistent with Secretary of the Interior Standards for Treatment of Historic Properties as applicable.

Entry:

Entrance. The junior accessory dwelling unit shall include an exterior entrance separate from the main entrance to the single family dwelling, and an interior entry into the main living area. The junior accessory dwelling unit may include a second interior doorway for sound attenuation.

Kitchen / Bath:

Floor plan. A floor plan, drawn to scale, showing the dimensions of each room, the area devoted to the junior accessory dwelling unit, and the resulting floor areas of the junior accessory dwelling unit and of the primary residence. The use of each room shall be identified, and the size and location of all windows and doors shall be clearly shown. The plan shall identify whether separate or shared sanitation facilities are proposed. Kitchen. The junior accessory dwelling unit must contain an efficiency kitchen with the minimum criteria: Sanitation. Bathroom facilities may be separate from or shared with the single family dwelling.

For more ADU Information:

https://srcity.org/2280/Accessory-Dwelling-Units

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