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Concord ADUs

Everything about building Accessory Dwelling Units in Concord, CA

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PLANNING OFFICE The city planning office is not open to the public at this time, but is accepting ADU permit questions and applications.

The city government of Concord 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



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City Hint: The city permitted a total of 50 ADU project(s) in the past year of 2018, which makes it above average for ADU production compared to other cities statewide.


Number of ADUs allowed:

Under state law, each single-family home may now build at least one Accessory Dwelling Unit (ADU). Owner occupied single-family properties may build one Accessory Dwelling Unit (ADU) and one Junior Accessort Dwelling Unit (JADU). Multi-family properties, per every four existing residential units, may build one Accessory Dwelling Unit (ADU), so long as the existing units 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:

Residential properties will not be subject to any minimum lot size for Accessory Dwelling Unit (ADU)s by ordinance or of the underlying zoning district. ~ AB-68

As of January 1st, 2020

ADU size:

Single-family and multi-family Lots will be allowed to create up to 850 square ft. for a one bed ADU or up to 1,000 square ft. for a two bed ADU, regardless of the underlying zoning standards of the property. A JADU up to 500 square ft. is allowed. The minimum size of any living unit (including Accessory Dwelling Units and JADUs) is 150 square ft. according to Califronia Residential Code. ~ AB68 & AB881 Update

As of January 1st, 2020

Setbacks:

The maximum required setback for a detached new construction Accessory Dwelling Unit shall be no more than 4 ft from the rear and side property lines. Setbacks will not be required for Accessory Dwelling Units and Junior Accessory Dwelling Units converted from existing space that was legally eastablished. Attached Accessory Dwelling Units 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:

Parcels 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. ~ AB-68

As of January 1st, 2020

Fire Safety:

Per State Requirements.

Shape, materials and style:

Accessory dwelling units must be subordinate to the primary structure by size, location, and appearance, and must comply with the following criteria:
1. Roofing and siding materials shall be the same style, color, and materials as the roofing and siding materials predominant on the primary structure.
2. Accessory dwelling units shall be painted the same color, or be complementary to, the color scheme of the primary structure.
3. Architectural detailing, including but not limited to fascia, window trim, and door trim, shall replicate and be complementary to the trim detailing of the primary structure.

Height:

ADU height shall be in accordance with the underlying zoning code.

Design review:

A new accessory dwelling units require Planning Ministerial Approval and a Building Division Permit. A checklist for submittal requirements for the Planning Minister Approval is attached for reference.

Number of Bedrooms:

A maximum of one bedroom for units measuring between 150 square feet and 640 square feet and a maximum of two bedrooms for units between 640 and 1,200 square feet

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

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.

Definition:

An accessory dwelling unit is an independent dwelling located on the same lot as an existing single-family residence. The unit may be created by converting existing floor space, converting an existing accessory structure, attaching the unit to the main residence, or building a separate structure. The purpose of allowing Accessory Dwelling Units is to provide the opportunity for the development of small rental housing units designed to meet the special needs of families and individuals.

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. ***

Accessory dwelling units are allowed in all single-family residential (RR, RS) districts, low-density residential districts (RL), and in other districts where a legal single family residences exists. An accessory dwelling unit shall meet all provisions of the district in which they are located (Zoning information can be found at: http://www.concordprospector.com.)

As of January 1st, 2020

Residential Building Code:

The California Building Code (CBC) 2019 is adopted.

Concord City Planning Offices
Permitting

Planning & Zoning

1950 Parkside Drive Concord, CA 94519 Concord, CA 94519

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ADU Example Designs

ADU Model 216 sqft

W 18 ft L 12 ft

ADU Model 665 sqft

W 38 ft L 18 ft

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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

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: $3.08) * (ADU's Living Space: sqft)




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