1. Existing Building Conversion. An ADU created entirely through conversion with no modifications to the existing building envelope that exceeds the development standards for maximum gross floor area in Table 23.306-2, ADU Development Standards, is allowed a physical addition of no more than 150 square feet. The addition must comply with maximum height and setback requirements.

2. Duplex or Multi-Family Dwelling Conversion. Interior ADU(s) must be created entirely through non-habitable residential portions of the existing main building that are not within the living space of a dwelling unit (e.g. basement, attic, garages, storage room).

3. Accessory Building or Accessory Structure Conversion. An ADU converted from a legally established accessory building or accessory structure is allowed to maintain non-conformity to the same location and dimensions of the existing accessory building or accessory structure, provided that the ADU meets fire and safety standards set forth in the California Building Standards Code adopted in BMC Title 19. Any physical additions to the existing accessory building or accessory structure shall comply with the development standards in Table 23.306-2 ADU Development Standards.

4. Front Setback, New Construction. An ADU shall not occupy area within the front setback, unless the requirement would preclude an ADU of 800 square feet. Should an ADU require area within the front setback, the ADU shall maintain a minimum 10-foot setback from the front lot line, unless such setback would preclude an ADU of 800 square feet. If a 10-foot setback would preclude an ADU of 800 square feet, the ADU shall maintain a 5-foot setback from the front lot line. If a 5-foot setback would preclude an ADU of 800 square feet, the ADU may be sited up to the front lot line.

5. Attached ADU. An ADU shall be considered attached if sharing a common wall with a primary dwelling.

6. Detached ADU Setback Exceptions. If there is a lesser setback allowed in 23.304.060 -- Accessory Buildings and Enclosed Accessory Structures for a comparable accessory building or accessory structure in the underlying zoning district, that setback shall apply.

7. Building Separation for Detached ADU. A minimum 8-foot separation is required within the Hillside Overlay, except where such separation would preclude an ADU of 800 square feet, in which case the minimum building separation shall be reduced to 5 feet.

8. Attached ADU, New Construction Height. Attached ADUs with height up to 25 ft. allowed with a Zoning Certificate.

1. Basic Standards. A Junior ADU shall be contained entirely within an existing or proposed single family dwelling or its attached garage, and have no more than 500 square feet in floor area.

2. Shared Sanitation Facility. If a Junior ADU shares a sanitary facility with a single-family dwelling, an internal connection between the Junior ADU and the main living area of the single family dwelling is required.

3. Junior ADU Floor Area. The Junior ADU gross floor area calculation excludes any shared sanitation facility with the single family dwelling.

1. Outside of the Hillside Overlay. Chimneys, water heater enclosures, flues, heating and cooling equipment, eaves, cornices, canopies, awnings, bay windows, and balconies may project two feet into the required front and side setbacks, so long as there remains at least a two-foot setback from property lines. Bay windows and balconies may not project into a required rear ADU setback.

2. Within the Hillside Overlay. No projections shall be allowed within a required setback.