Orange County is known for its coastal cities, established suburban neighborhoods, planned communities, and major employment centers. Browse ADU information for Anaheim and other jurisdictions throughout the county.
Incorporated cities inside Orange County adopt their own ADU standards, so a property inside city limits follows that city's rules. County standards apply to the unincorporated areas.
Rules are grouped by topic. Open a topic for the answers, the conditions on them, and the official source each one came from. Each rule names the authority that set it: Statewide standard and Orange County standard.
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66 rules
What can I build?
The kinds of accessory dwelling unit this jurisdiction recognises.10 rules
Detached ADU allowed
Allowed
Detached ADUs are authorized on the same lot as a proposed or existing primary dwelling.
Set by: Statewide standard
In force from: Effective
Explanation
Whether a detached, newly constructed ADU is permitted.
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(3)
Source document
California Government Code, Title 7, Division 1, Chapter 13
The codified local standard states a two-detached-ADU maximum for existing multifamily projects.
Set by: Orange County standard
Note: Conditions apply
Up to 2 count
A lot with a proposed multifamily dwelling may have up to two detached ADUs.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Up to 8 count
An existing multifamily lot may have up to eight detached ADUs, but no more than its existing dwelling-unit count.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Up to 1 count
One detached new-construction ADU is ministerially allowed on a qualifying single-family lot.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is yes
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is no
Part of Statewide, published by California.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is yes
Part of Statewide, published by California.
Explanation — Statewide standard
Greatest number of detached ADUs permitted on the property.
When this applies
Applies when all of the following are true:
Property primary structure type is Single family
Part of Statewide, published by California.
Sources (2) — Orange County standard
Accessory Dwelling Units | OC Development Services, § How many ADUs am I allowed to build?
Source document
Accessory Dwelling Units | OC Development Services
Publisher
Orange County
Document type
ADU webpage
Source type
Official guidance
Section
How many ADUs am I allowed to build?
Source checked
August 24, 2026
Excerpt
up to 8 detached ADUs are allowed on a lot with an existing multifamily residential structure
Which lots, zones and existing homes qualify.6 rules
ADU allowed on this property
Allowed
The County allows ADUs on qualifying single-family and multifamily residential properties.
Set by: Orange County standard
Note: Conditions apply
Allowed
ADUs are authorized on lots with a proposed or existing primary residence in qualifying residential or mixed-use areas.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether an ADU may be built on the property at all, before any other standard applies.
When this applies
Applies when all of the following are true:
Property primary structure type is one of Single family, Multifamily
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether an ADU may be built on the property at all, before any other standard applies.
When this applies
Applies when all of the following are true:
Property primary structure type is one of Single family, Multifamily, Mixed use
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90, p. 194
The local ADU provision applies in qualifying single-family residential areas and existing multifamily projects, including planned-community and specific-plan areas.
Set by: Orange County standard
Note: Conditions apply
Allowed
An ADU is a residential use consistent with the lot's existing general-plan and zoning designations where the lot allows single-family or multifamily residential use.
Set by: Statewide standard
In force from: Effective
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether the zoning district permits ADUs.
When this applies
Applies when all of the following are true:
Property primary structure type is one of Single family, Multifamily
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether the zoning district permits ADUs.
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90, p. 194
The County code limits multifamily ADUs to properties with an existing established multifamily project.
Set by: Orange County standard
Note: Conditions apply
Not required
A primary dwelling may be proposed rather than already built.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether a primary dwelling must already exist, or be built concurrently, before an ADU is permitted.
When this applies
Applies when all of the following are true:
Property primary structure type is Multifamily
Property has existing primary dwelling is no
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether a primary dwelling must already exist, or be built concurrently, before an ADU is permitted.
When this applies
Applies when all of the following are true:
Application includes proposed primary dwelling is yes
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90(b)(1), p. 195
When parking has to be provided, and when it is excused.9 rules
Parking spaces required
1 spaces
One parking space is required for an ADU unless a listed parking exemption applies.
Set by: Orange County standard
Note: Conditions apply
0 spaces
No additional parking may be required for a JADU.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Up to 1 spaces
ADU parking may not exceed one space per ADU or per bedroom, whichever is less; JADUs may not require additional parking.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Application type is one of Adu, Adu and jadu
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Application type is Jadu
Part of Statewide, published by California.
Explanation — Statewide standard
Off-street parking spaces required for the ADU.
When this applies
Applies when all of the following are true:
Application type is one of Adu, Adu and jadu
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90(d)(1), p. 196
Connections, meters and the charges that come with them.11 rules
Separate utility meter required
Not required
A separate utility connection is not required when the unit is attached to or within an existing primary dwelling or accessory structure.
Set by: Orange County standard
Note: Conditions apply
Not required
For qualifying conversion ADUs and JADUs, a new or separate direct utility connection may not be required except with a new single-family dwelling or separate conveyance.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether the ADU must have its own utility meter.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether the ADU must have its own utility meter.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90(c)(7), p. 196
A new utility connection is not required for qualifying attached or conversion units.
Set by: Orange County standard
Note: Conditions apply
Not required
Qualifying conversion ADUs and JADUs cannot be required to install a new direct utility connection, subject to statutory exceptions.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether a new utility connection, rather than a shared one, is required.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether a new utility connection, rather than a shared one, is required.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90(c)(7), p. 196
No related utility connection fee or capacity charge is required for qualifying attached or conversion units.
Set by: Orange County standard
Note: Conditions apply
Not required
A related connection fee or capacity charge cannot be imposed on qualifying conversion ADUs and JADUs, subject to statutory exceptions.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Where a topic is recorded at more than one level, both entries are shown with the authority that set them. Which one governs a particular property is a question for the responsible planning agency.
Explanation — Orange County standard
Whether a utility connection fee or capacity charge applies.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Orange County Local Rules, published by Orange County.
Explanation — Statewide standard
Whether a utility connection fee or capacity charge applies.
When this applies
Applies when all of the following are true:
Project construction type is one of Interior conversion, Accessory structure conversion, Garage conversion
Part of Statewide, published by California.
Source — Orange County standard
County of Orange Comprehensive Zoning Code, § § 7-9-90(c)(7), p. 196
A completed ADU or JADU application on a lot with an existing qualifying dwelling must be approved or denied within 60 days; applicant-requested delay tolls the period.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Explanation
Longest period the agency may take to approve or deny a completed application. Frequently scoped to lots with an existing dwelling; that condition belongs in the claim's applicability, not in this description.
When this applies
Applies when all of the following are true:
Property has existing primary dwelling is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code §§ 66317(a)(3), 66335(a)(3)
Source document
California Government Code, Title 7, Division 1, Chapter 13
Maximum period to act on a coastal development permit
Up to 60 days
A completed coastal development permit application for an ADU must be approved or denied within 60 days, subject to the concurrent-primary-dwelling exception.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Explanation
Longest period the agency may take to act on a coastal development permit application. Separate from the underlying ADU application timeline.
When this applies
Applies when all of the following are true:
Property overlays includes Coastal overlay
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66329(a)
Source document
California Government Code, Title 7, Division 1, Chapter 13
For a detached garage replaced by an ADU, written notice or placarding for demolition cannot be required outside an architecturally and historically significant historic district.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Explanation
Whether a demolition permit review or delay applies to the project.
When this applies
Applies when all of the following are true:
Property overlays does not include Historic district
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(f)
Source document
California Government Code, Title 7, Division 1, Chapter 13
An ADU or JADU generally may not be sold separately from the primary residence, subject to a statutory separate-conveyance exception not captured by this broad rule.
Set by: Statewide standard
In force from: Effective
Note: Conditions apply
Explanation
Whether the ADU may be sold separately from the primary dwelling.
When this applies
Applies when all of the following are true:
Project separate sale intended is yes
Part of Statewide, published by California.
Source
California Government Code, Title 7, Division 1, Chapter 13, § Gov. Code § 66314(d)(1)
Source document
California Government Code, Title 7, Division 1, Chapter 13
ADUDesk summarises recorded rules for informational purposes and may not include every requirement. Confirm current requirements with the responsible planning agency before making design, purchase, or permit decisions.
About this information
Dates, versions and how rules are recorded
Rules are recorded from official sources and each one links to the document it came from. A source check confirms the document was retrieved and read; it is not a legal review, and the record may not cover every requirement that applies to a property or project.
Report as of
The date the rules on this page were resolved for.
Jurisdiction record reviewed
Not recordedWhen this jurisdiction's record was last checked. Not a legal review.
Statewide
Published by California
Rule-set effective from
Published
Statewide rules reviewed
A staff check of this rule set against its sources.
What changed in this version: Initial
Orange County Local Rules
Published by Orange County
Rule-set effective from
Published
Local rules reviewed
A staff check of this rule set against its sources.
What changed in this version: Created from V2 research draft #6 (run #22).
