STATEWIDE UPDATE: New California ADU Bills SB13, AB68, AB881, AB670 have passed. These laws will create more options for building an ADU in Piedmont in 2020. To prepare for the upcoming changes use our ADU Services to learn how these laws will effect your property!
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Piedmont ADUs

Everything about building Accessory Dwelling Units in Piedmont, CA

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Piedmont ADU Guidelines Last Updated 08/11/19

codes

The city government of Piedmont has updated its local zoning codes to comply with the State ADU mandate.
The California Building Code (CBC) 2016 without amendments is adopted.
Relevant state bill updates for SB13, AB68, AB881, AB670 are shown in green below.


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.


Zoning

Number of ADUs allowed:

Limit of one accessory dwelling unit. There may be no more than one accessory dwelling unit on a parcel. No subdivision of land is authorized that would result in an
An accessory dwelling unit being located on a separate parcel, unless each parcel meets all of the zoning requirements for the zoning district in which it is located.

AB68 & AB881 Update: Properties which convert existing space to create ADUs may be eligible for one ADU -AND- one JADU.

Types of ADUs allowed:

Detached, attached and junior ADUs allowed.

Lot size:

Per the minimum state requirements.

AB68 & AB881 Update: Properties will not be subject to minimum lot standards by ordinance or of the applicable zoning district.

ADU size:

Size. An attached accessory dwelling unit may not exceed 50% of the existing living area up to a maximum of 800 square feet, subject to the zoning regulations (including floor area ratio). A detached accessory dwelling unit may not exceed 800 square feet, subject to The zoning regulations (including floor area ratio). The applicant may seek an exception Under section 17.38.070 C.1.

AB68 & AB881 Update: Properties will be allowed up to 850 square feet for a one bedroom or up to 1,000 square feet for a two bedroom ADU.

Setbacks:

Setbacks. No setback is required for an existing garage that is converted to an Accessory dwelling unit. If an accessory dwelling unit is constructed above an existing garage, the minimum setback is five feet from the side and rear lot line.

AB68 & AB881 Update: The maximum required setback for a detached new construction ADU shall be no more than 4 feet from the rear or side property lines.

Parking:

Parking. When a garage, carport, or covered parking structure is demolished in
Conjunction with the construction of an accessory dwelling unit, any required
Replacement parking spaces may be located in any configuration on the lot except that the
Spaces may not be located within the 20-foot street setback. (. Code §65852. 2
(a) (1) (D) (xi).)

AB68 & AB881 Update: Properties which convert an existing garage will not be subject to replacement parking requirements.

Fire Safety:

Fire sprinklers. Fire sprinklers shall only be required in accessory dwelling units if
Fire sprinklers are also required for the primary dwelling. (. Code §65852. 2 (e).)

Shape, materials and style:

Style, massing, materials, and colors must resemble the characteristics of the primary dwelling.

Height:

Height of the ADU will be determined by the maximum height of the underlying zone.

Design review:

Ministerial review process per state minimum standards.

Number of Bedrooms:

Not specified by State Standards.

Ownership:

Owner occupancy. Except for an exempt accessory dwelling unit, the owner of an
accessory dwelling unit must occupy either the primary unit or the accessory dwelling unit,
if both units are used for habitation. The owner must record with the County Recorder a
declaration of restrictions, in a form provided by the city.Owner occupancy. Except for an exempt accessory dwelling unit, the owner of an
accessory dwelling unit must occupy either the primary unit or the accessory dwelling unit,
if both units are used for habitation. The owner must record with the County Recorder a
declaration of restrictions, in a form provided by the city.

Single household. An accessory dwelling unit permit with an exception is designed
for an accessory dwelling unit that is in a dwelling or portion of a dwelling designed
for, or occupied exclusively by, persons living as one household.

SB13 Update: Owner-occupancy requirements for ADUs will be voided statewide for 5 years.

Utility connections:

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

Definition:

Accessory dwelling unit means an attached or a detached residential dwelling unit that
provides complete independent living facilities for one or more persons. It includes
permanent provisions for living, sleeping, eating, cooking, and sanitation on the same parcel as a primary unit.

Exceptions:

Exception to floor area ratio for new primary residence and accessory dwelling unit. If a
property owner proposes a new primary residence and an accessory dwelling unit, the Planning Commission may approve a floor area ratio exemption without rent restriction as follows: the square footage of the accessory dwelling unit will not count toward the total floor area ratio for the property up to 800 square feet or 10% of the lot size, which ever is less.

Exception: unit size. The Planning Commission may approve an exception to the unit size requirement for the accessory dwelling unit. The decision will be based on the requirements and findings of this section. If an exception is granted, the accessory dwelling unit will be subject to all the terms of section 17.38.070C.2 below, including rent-restrictions.

Exception to unit size. The Planning Commission may approve an accessory dwelling
unit permit with an exception to the maximum unit size of 800 square feet (under section
17.38.060 B.1) up to a maximum unit size of 1,200 square feet, as follows:
IF THE LOT SIZE: THE ACCESSORY DWELLING
UNIT MAY BE:
UNIT UP TO 1000
SQ. FT.
UNIT UP TO 1,200
SQ. FT.
is less than the
minimum for the
zoning district:
only located within an
existing building, without
rent restriction for low income housing applies rent restriction for very low income housing applies

expansion of the existing
building envelope.
equals or exceeds
the minimum for
the zoning district:
within existing building, an
expansion, or a detached
building
rent restriction
for low income
housing applies
rent restriction for
very low income
housing applies

Rent restriction.
i. Declaration of rent restrictions. The accessory dwelling unit permit with an
exception shall have a condition describing the type of rent restriction applicable to
the property. The rent-restriction shall be recorded in the county recorder's office,
as a declaration of rent restrictions (in a form provided by the city), and will remain
in effect for ten years. The ten-year period of rent restriction begins either: (a) on
the date of recordation or date of final building inspection, whichever is later; or (b)
according to the terms of the conditions of approval or a recorded declaration.
If, after ten years, the termination of the recorded declaration is not automatic (by
its terms), the city will record a document terminating the declaration of rent
restrictions, upon the written request of the property owner.
ii. Affordable rent certification. An owner who has executed a declaration must
submit to the city an accessory dwelling unit affordable rent certification: (i) on an
annual basis, by each December 31 and as part of the annual city business license
application and renewal; and (ii) upon any change in occupancy of the accessory
dwelling unit. The accessory dwelling unit affordable rent certification must be on
a form provided by the city and must specify whether or not the accessory dwelling
unit is being occupied; the rent charged; the utilities that are included in the cost of
rent; the household size of the accessory dwelling unit; the names and ages of the
accessory dwelling unit occupants; the gross household income of the accessory
dwelling unit household; and other information as determined appropriate by the
city.

Entry:

Access. The accessory dwelling unit must have independent, exterior access.

Passageway. No passageway will be required.

Existing:

Exempt accessory dwelling unit. If an accessory dwelling unit was established before
1930, and the City has confirmed the exempt status in writing, the accessory dwelling unit is a legally existing accessory dwelling unit.

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

Residential Building Code:

The California Building Code (CBC) 2016 without amendments is adopted.

Piedmont City Planning Offices
Permitting

Piedmont Planning & Zoning

120 Vista Ave., Piedmont, CA Piedmont, CA 94611

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CA Statewide


Tailored to ADU construction.

Based on project size & appreciation.

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Karyn Jones

Program Representative

Call Now (760) 496-5959

Read Piedmont Housing Market Update

Featured ArticleState of CA
Featured ArticleState of CA

Opinion: How California can solve its housing disaster https://www.mercurynews.com/ 2018-02-02

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Costs / ROI

APPRECIATION ESTIMATE

* upon completion of ADU

CONSTRUCTION COST ESTIMATE

* based on local average price per sqft

RENTAL ESTIMATE

* estimated by location

MORTGAGE ESTIMATE

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

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: $8.16) * (ADU's Living Space: sqft)




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