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(650) 730-2387 ext: 542
Schedule ADU Consultation (650) 730-2387 ext: 542

Mountain View ADUs

Everything about building Accessory Dwelling Units in Mountain View, CA

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PLANNING OFFICE The city has closed all operations during the COVID-19 outbreak. More information will be posted here once it becomes available. In the meantime, we are providing services for Mountain View properties based on recent projects and research.

The city government of Mountain View has updated its local zoning codes to comply with the State ADU mandate.
The California Building Code (CBC) 2019 is adopted.
Relevant state bill updates for SB13, AB68, AB881, AB670 are shown in green below.

Last Updated 04/05/20



hintsights

City Hint: The city has not yet responded to requests for ADU permit volumes for the past year, but they will be provided here once response has been received.


Number of ADUs allowed:

According to state law, all single-family homes are allowed at least one Accessory Dwelling Unit. Additionally, single-family parcels which are owner-occupied may create one Accessory Dwelling Unit and one Junior ADU. Also, multi-family parcels may now add one ADU per every four existing residential units, so long as they were legally established.

As of January 1st, 2020

Types of ADUs allowed:

Detached ADU, Attached ADU, Junior ADU are permitted. ADUs may be new construction or converted from existing space. JADUs must be converted from existing space.

Lot size:

Accessory Dwelling Unit projects on single family or multi-family residential parcels will not be subject to the minimum lot size of the underlying local zoning code or by special ordinance. ~ According To AB68

As of January 1st, 2020

ADU size:

Residential parcels will be approved to build up to 850 square ft. for a one bedroom ADU or up to 1,000 square ft. for a two bedroom ADU, regardless of the underlying zoning standards of the property. A Junior Accessory Dwelling Unit is approved up to 500 square ft.. According to Califronia Residential Code, the minimum size of any living unit is 150 square ft. (including Accessory Dwelling Unit (ADU)s and Junior Accessory Dwelling Units). ~ AB68

As of January 1st, 2020

Setbacks:

The maximum required setback for a detached new construction ADU shall be no more than 4 feet from the rear and side property lines. Setbacks will not be required for ADUs and Junior Accessort Dwelling Unit (JADU)s converted from existing space that was legally eastablished. Attached ADUs and conversions from existing space to be expanded will be required to comply with the setbacks of the underlying zone. ~ According To AB68

As of January 1st, 2020

Parking:

Lots which convert an existing garage to an Accessory Dwelling Unit (ADU) or Junior Accessort Dwelling Unit (JADU) will not be subject to replacement parking requirements. ~ According To AB68

As of January 1st, 2020

Fire Safety:

Per state requirements.

Shape, materials and style:

The design of the unit shall conform in general to the design of the primary dwelling.

Height:

1‐story detached: 16 feet maximum building height and 9 feet at top of the wall plate. 1‐story attached: See Sec. 36.10.25 for height limits for principal structures. 2‐story (over garage): 28 feet maximum building height and 22 feet at top of wall plate.

Design review:

Ministerial review process.

Number of Bedrooms:

Not specified by State Standards.

Ownership:

Between between 2020 and 2025, owner occupancy requirements will not apply to new Accessory Dwelling Units. (applicable to new construction and conversion units) ~ SB13 Update

As of January 1st, 2020

Utility connections:

Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)

Permit Fees

SB13 Update: As of January 1st, 2020, local impact fees for ADUs will be reduced substantially statewide.

Allowed Zones:

*** Beginning in 2020, according to state law, all residential zoning districts, including single-family and multi-family, are allowed to build Accessory Dwelling Units. ***

An accessory dwelling unit may be allowed on a lot occupied with a single-family
dwelling unit in the R1 zoning district in addition to a primary dwelling

As of January 1st, 2020

Existing Structures

Conversion of an accessory structure/garage or other living space to an
accessory dwelling unit shall meet all adopted building codes for residential occupancy.
Such conversions shall also require a ministerial review or a hearing within one
hundred twenty (120) days after receipt of a substantially complete application.

SB13 Update: Amnesty program to permit unpermitted units will be administered statewide, allowing non-health and safety code violations to be deferred.

Location:

1) Attached to a principal structure - Basement, ground level or above the garage with
no internal access to the primary dwelling. 2) Detached unit - Rear half of lot. 3) Above a detached garage - Rear half of lot.

Residential Building Code:

The California Building Code (CBC) 2019 is adopted.

Mountain View City Planning Offices
Permitting

City of Mountain View Planning Department

Diana Pancholi

500 Castro Street Mountain View, CA 94041 Mountain View, CA 94041

Call/Text ADU Operator (650) 730-2387
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APPRECIATION ESTIMATE

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CONSTRUCTION COST ESTIMATE

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RENTAL ESTIMATE

* estimated by location

MORTGAGE ESTIMATE

* 30 years / 5% interest rate / 20% down payment

SELECT ADU SIZE & TYPE

Size: 500 sqft

BASED ON LOCAL AVERAGE PROPERTY DATA & VALUE

Appreciation Estimate = (Base Value: $) / (Home's Living Space: sqft) * (ADU's Living Space: sqft)

Rental Estimate = (Rent Per Sqft: $5.28) * (ADU's Living Space: sqft)




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