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Morgan Hill, California: ADU Regulations

City or County:

Morgan Hill, California

Date Updated:

07.02.2019

Zoning:

O-S/CC-R/R-2/R-1/R-E

Types of ADUs:

Attached, Detached

Stories:

Must be compatible with the design and scale of the existing dwelling.

Maximum ADU Floor Area:

For Detached:

RE 10: 1200 sq. ft.

RE 2.5: 1,000 sq. ft.

RE 1: 900 sq. ft.

All other zoning districts: 750 sq. ft.

Attached ADUs shall not exceed 30% of existing living area

Lot Coverage:

Must follow requirements established by the zoning district in which lot is located.

Bedroom:

2 bedrooms maximum

Storage:

No min/max

Kitchen:

Require separate kitchen facilities (permanent range, counters, refrigerator, and sink)

Bath:

Detached secondary dwelling units shall provide separate and independent septic tank sewage disposal systems. All leach lines shall be designed and installed in accordance with Bulletin A, "Septic Tank Sewage Disposal System," or other current septic system requirements issued by the Santa Clara County Environmental Health Services. This provision shall only apply in areas of city where septic tank disposal systems are allowed due to lack of sanitary sewer lines.

In other areas of city, the second unit shall be connected to the sanitary sewer system through the existing lateral line serving primary dwelling unit.

Note: Drainage and sewer connections should be assessed on a project by project basis.

Parking:

At least one space for a studio or one-bedroom secondary unit and a minimum of two spaces for secondary dwelling unit containing two bedrooms, in addition to those required for primary dwelling unit.

Off-street parking spaces for secondary dwelling unit may be uncovered. Secondary dwelling parking may be located within the front, side or rear yard areas.

Exceptions:

- ADU is located within one-half mile of Morgan Hill Caltrain station or a bus transit stop with a frequency of service interval of fifteen minutes or less during the morning and afternoon peak commute periods.
- ADU is located within a National Register Historic District or other historic district officially designated by the city council
- When on-street parking permits are required but not offered to the occupant of the ADU
- When there is a car share vehicle pick-up/drop-off location within one block of the ADU

When an existing garage, carport, or covered parking structure is demolished in conjunction with the construction of an accessory dwelling unit, and the zoning code requires that those parking spaces be replaced, the replacement spaces may be located in any configuration on the same lot as the accessory dwelling unit, including, but not limited to, as covered spaces, uncovered spaces, or tandem spaces, or by the use of mechanical automobile parking lifts. 

Setbacks:

Detached ADUs must conform to the building setback and FAR or lot coverage limitations for the applicable zoning district.

Note: Fire Department regulations should be assessed on a project by project basis.

Height:

Must be compatible with the design and scale of the existing dwelling.

Location:

Secondary dwelling units may be either detached or attached to primary dwelling unit on the property. Detached ADUs must be located at least 6' from primary dwelling.

Rear Yard Coverage:

Must follow requirements established by the zoning district in which lot is located.

Design:

ADU shall be clearly subordinate to the primary dwelling by size, appearance, and location on the parcel.

The design of secondary dwelling unit shall be compatible with design and scale of existing dwelling (using substantially the same landscaping, color, materials and design on exterior) and the general character of neighboring residential properties.

Note: Historic Neighborhoods or Districts should be assessed on a project by project basis.

Entryways:

N/A

Code Source:

Important Note: Rules and regulations are updated and changed frequently. It’s one of our jobs to be up to speed and navigate those regulations. Let us know if our website isn’t up to date or if you have any information that could help. Cheers!