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(714) 942-2748 ext: 203
Schedule ADU Consultation (714) 942-2748 ext: 203

Orange ADUs

Everything about building Accessory Dwelling Units in Orange, CA

Research local zoning codes for ADU design
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Orange ADU Guidelines Last Updated 01/26/21

The city government of Orange will approve ADUs under California's statewide mandated regulations.
The California Building Code (CBC) 2019 is adopted.



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City Hint: The city permitted a total of 10 ADU projects in the past year of 2019, which is below the average compared to other cities in California.


Number of ADUs allowed:

Under state law, each single-family home may now add at least one ADU. Owner occupied single-family properties may add one ADU and one Junior ADU. Multi-family properties, per every four existing residential units, may add one ADU, so long as the existing units were legally established.

Types of ADUs allowed:

Detached ADU, Attached ADU, Junior ADU are permitted. Accessory Dwelling Unit (ADU)s may be new construction or converted from existing space. Junior Accessort Dwelling Unit (JADU)s must be converted from existing space.

Lot size:

Residential properties will not be subject to any minimum lot size for Accessory Dwelling Units by ordinance or of the underlying zoning district. ~ AB68

ADU size:

Residential properties will be approved to create 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 ADU is approved up to 500 square ft.. According to California Residential Code, the minimum size of any living unit is 150 square ft. (including Accessory Dwelling Unit (ADU)s and Junior ADUs). ~ Updated: State Law AB-68

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

Parking:

Properties which convert an existing garage to an ADU or JADU will not be subject to replacement parking requirements. ~ According To AB68

Fire Safety:

Accessory dwelling units shall not be required to provide fire sprinklers unless they are also required for the primary dwelling. ~ State Standards

Shape, materials and style:

Specific design styles and restrictions are not specified under State Standards. Passageways shall not be required in conjunction with the construction of an accessory dwelling unit. ~ State Standards

Height:

The maximum height of an ADU is not specified in the state standards. If ADU maximum height is not established locally, the height limitations of the underlying zone shall apply. ~ State Standards

Design review:

The municipality shall provide a ministerial review process which is not based on a discretionary approval for an ADU. The process shall take no less than 120 days. Valid applications submitted for ADUs, if not approved or denied within 120 days from submission, shall be considered approved. ~ State Standards

Number of Bedrooms:

No maximum number of bedrooms is established other than that implied by the maximum size of an ADU allowed. ~ State Standards

Ownership:

Owner-occupancy will not be required for new Accessory Dwelling Unit (ADU)s (conversion and new construction) built between 2020 and 2025. ~ SB13 Update

Utility connections:

Connection and utility fees shall be reasonable, and shall not be disproportionately higher than those to develop primary dwellings, so as not to deter the development of ADUs. If a private sewage disposal system is used, such as a septic system, review and approval by a local health officer may be required. ~ State Standards

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. ***

Residential Building Code:

The California Building Code (CBC) 2019 is adopted.

Read Orange Housing Market Update

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ADU Design Library

Browse hundreds of models to find the right fit for your property.

ADU Model 800 sqft

W 44 ft L 15 ft

ADU Model 300 sqft

W 25 ft L 12 ft

ADU Model 484 sqft

W 22 ft L 22 ft



Complete 5-Step Process

Design
Browse hundreds of permit-ready ADU designs and order one to customize to your needs.
Marketplace
Connect with local contractors to get site visits and cost estimates for your project.
Customization
Mark up changes to your plans and provide critical info needed to permit your project.
Permits
Finalize your project blueprints to submit for building permits.
Construction
Select your contractor and build your project.
Detached ADU - Completed in 2020
1,003 sq. ft., 3 bed, 2 bath

Estimate Your ADU Potential
Financing
Costs / ROI

SELECT ADU SIZE & TYPE

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: $3.58) * (ADU's Living Space: sqft)

Check your property's zoning, browse designs & get contractor estimates for your ADU project:

Everything you need to get accurate estimates from contractors for your ADU project. Get help with ADU feasibility, design, permitting and sourcing contractors for your project in one place.

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Housable is providing information about specific properties that is furnished to users as a good-faith estimate of the development potential of a property. You should not in any way base your development, investments, or other financial decisions on this information. We strongly advise you to consult with an industry professional, such as a lender, realtor, contractor, or architect, who is sufficiently licensed and insured in their field, and who can work with you individually to confirm all requirements before moving forward with any real estate development or investment.