| Streamlined process for detached ADUs on all eligible parcels and attached ADUs that do not fall under the following categories:
- Site and Architectural Review
- Attached ADUs in San Tomas Area Neighborhood Plan
- Attached ADUs created by adding 750 sq ft or greater in gross floor area or 350 sq ft or greater in gross floor area on a second-story, on a property located in the R-1-8 zoning district that are not subject to the San Tomas area neighborhood plan.
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- All residential zoning districts
- P-D (Planned Development) Zoning District on a parcel with a General Plan land use designation that directly corresponds to a residential zoning or mixed-use district (as specified by Section 21.04.020).
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- 500 square feet for JADUs
- 1,200 square feet for ADUs
- Attached or interior ADUs (and JADUs) shall not exceed 50% of the living area of the primary dwelling unit
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| Single-Family Properties:
- One ADU and one JADU may be built, as long as the property satisfies the minimum standards outlined in Section 21.23.020 of the Campbell Municipal Code
Multi-Family Properties:
- Up to one ADU for every four non-ADU units within the dwelling structure can be created from existing, non-livable space
- Up to two detached ADUs may be built in addition
An ADU can contain only one kitchen and one living room (defined as a habitable room with an area not less than one hundred twenty square feet).
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| Detached ADUs:
- ADUs may be up to 2 stories if the (existing or proposed) primary dwelling unit is also 2 stories
- ADUs may be up to 18’, with an additional 2′ height permitted if necessary to align the roof pitch with the roof pitch of the (existing or proposed) primary dwelling unit
- After 18’, the height of a detached ADU may not exceed the height of the primary dwelling unit
Attached ADUs:
- ADUs may not exceed the height specified by the applicable zoning district and/or neighborhood Plan
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- Setback requirements are determined by the zoning
- Statewide exemption accessory dwelling units are exempt from the otherwise required (1) front setback, (2) building separation, (2) floor area ratio, (3) lot coverage, (4) open space, and (5) design requirements specified by Section 21.23.030 (Accessory dwelling unit development standards) and the design and placement requirements specified by Section 21.23.060 (Special provisions for historic properties), except that the exemption to the front setback for an attached accessory dwelling unit shall only apply to that portion of the primary dwelling unit occupied by the accessory dwelling unit. All other standards, requirements, and restrictions of this Chapter shall continue to apply.
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Lot or Location Restrictions |
- An ADU may be located in front of, to the side of, or behind the primary dwelling unit
- Lot coverage and floor area ratio (FAR) must comply with zoning district
- Open Space Requirements – Creation of an ADU can not reduce the required open space to less than what is specified by zoning
- Check with staff for possible exemptions
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- No parking spaces are required for new ADUs or JADUs
- Parking spaces that are removed to allow for an ADU or JADU do not have to be replaced (e.g., by demolition or conversion of a garage)
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- On a property with a Junior ADU, the property owner must live in either the Junior ADU or the primary dwelling unit
- The community development director may require a deed restriction documenting this owner-occupancy rule before issuing a building permit
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- Recording of deed restriction is required before a building permit can be issued
- Individual HOA requirements as applicable
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| Generally, ADUs and JADUs cannot be rented for fewer than 30 days at a time
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Departments and Agencies Involved in Permitting |
- Campbell Community Development Department- Planning, Building, Public Works
- Santa Clara County Fire District
- West Valley Sanitation District
- Santa Clara County Recorder’s Office
- Campbell Union School District (if ADU is above 750 square feet)
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- Fees vary depending on the size of the ADU, and typically range from $2,500 for a simple garage conversion to $14,000 for construction of a 1,200 detached ADU
- ADUs less than 750 square feet are not required to pay the the following fees:
- Campbell Union School District fee
- Park fee
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Sample Fees From Recently Built Projects | 1159 square foot, detached ADU, built in 2022
- Post Entitlement Plan Check – Ministerial Projects = $79.00
- Fire Plan Check = $168.00
- Fee at Plan Check In-House = $1,820.00
- Title 24 Energy Plan Check Fee = $183.00
- Deed Restriction = $207.00
- Waste Management Compliance Fee = $35.00
- Address Change or Addition = $183.00
- Residential Building Permit Group
- Technology Enhancement Fee = $104.00
- State Seismic Fee = $33.30
- Roadway Maintenance Fee = $832.00
- Plumbing Sub Trade Permit = $155.00
- Ministerial Projects Review = $79.00
- Mechanical Sub Trade Permit = $155.00
- General Plan Maintenance Fee = $416.00
- Electrical Sub Trade Permit = $155.00
- CA Building Standards Commission = $11.40
- Construction License Tax = $579.50
- Building Permit Fee = $5,200.00
- Park Fees = $7,905.00
- Credit Card Processing Fee = $3125.81 (4.00%)
TOTAL = $18,626.01
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