California ADU rules · Orange County
Can I Build an ADU in Yorba Linda?
Yes — you can build an ADU in Yorba Linda. California's statewide ADU law requires every city, including Yorba Linda, to approve a qualifying accessory dwelling unit by right, plus a junior ADU (JADU) on a single-family lot. What varies city to city are the local specifics below.
Can you build one?
ADUs allowed
Local ruleConditional
Detached ADUs over 1,000 sq ft (up to 1,200 sq ft on lots ≥15,000 sq ft) require discretionary Design Review; otherwise, ADUs and JADUs are ministerial.
Units on a single-family lot
CA state law1 ADU + 1 JADU
At least one ADU and one JADU per single-family lot (a conversion ADU may also be possible).
Units on a multifamily lot
Local ruleconversions (>=1 or 25% of units) + up to 2 detached
Only up to 2 detached ADUs allowed per multifamily lot, not 4 or 8 as in state baseline.
Junior ADU (JADU)
CA state lawAllowed
Up to 500 sq ft, within the walls of an existing single-family home (single-family lots only).
Size & height
Max detached ADU size
Local rule1,000 sq ft
Ministerial max is 1,000 sq ft; up to 1,200 sq ft allowed with discretionary review on lots ≥15,000 sq ft.
Max attached ADU size
Local rule1,000 sqft or 50% of primary, whichever is greater (up to 1,200 sqft discretionary on lots ≥15,000 sqft)
Ministerial max is 1,000 sq ft or 50% of primary dwelling, whichever is greater; up to 1,200 sq ft with discretionary review on large lots.
Guaranteed minimum size
CA state law800 sq ft
An 800 sq ft ADU must be allowed regardless of FAR/lot-coverage caps; a city also cannot cap an attached ADU below 850 sq ft (1,000 for 2+ bedrooms).
Max JADU size
CA state law500 sq ft
Max height
CA state law16 ft
16 ft baseline; cities must allow 18 ft within ½ mi of a major transit stop or where the primary dwelling is two-story, and 20 ft on a lot with a multistory multifamily building.
Setbacks
Side setback
CA state law4 ft
A city cannot require more than 4 ft side or rear setback; conversions of existing structures are exempt.
Rear setback
CA state law4 ft
Front setback
Local rulemust meet front yard setback of zoning district
Front setback must comply with base zone; no local override to allow encroachment.
Separation from main house
Local ruleNone required
No specific separation required; must comply with building/fire code.
Parking
Parking required
Local ruleUp to 1 space
1 space per ADU required unless exempt; no parking required for JADUs.
Transit parking exemption
CA state lawYes — no parking required near transit & for conversions
No parking may be required within ½ mi walking distance of transit, in a historic district, for an ADU within an existing structure, within one block of car-share, or in certain permit-parking areas.
Garage-conversion replacement parking
Local ruleNot required
No replacement parking required for garage/carport conversions.
Approval, timeline & cost
Approval path
CA state lawMinisterial (by right)
No public hearing or discretionary design review for a qualifying ADU.
Approval timeline
CA state law60 days
The agency must act within 60 days of a complete application — and the ADU is deemed approved if it does not.
Owner-occupancy
Local ruleOnly for a JADU
Owner-occupancy required for JADUs; not required for ADUs permitted 2020–2025 per state override.
Impact-fee waiver
CA state lawWaived under 750 sq ft
An ADU of 750 sq ft or less pays no impact fees (the 750 sq ft threshold itself is exempt under § 66311.5); larger ADUs pay fees proportional to the primary dwelling. JADUs (≤ 500 sq ft) are exempt.
Permits required
CA state lawBuilding permit
Only a ministerial building permit — no conditional use permit or discretionary design review for a qualifying ADU.
Yorba Linda-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Very High Fire Hazard Severity Zone (VHFHSZ)
ADUs must comply with local fire/building code; no special ADU prohibition.
Historic District
ADUs in historic districts are exempt from parking requirements.
Yorba Linda caps ministerial detached ADUs at 1,000 sq ft (up to 1,200 sq ft with discretionary review on large lots) and allows only 2 detached ADUs on multifamily lots. Attached ADUs may be larger than 1,000 sq ft if they do not exceed 50% of the primary dwelling, subject to the same discretionary review for larger units.
Frequently asked questions
Can I build an ADU in Yorba Linda?
Yes. California's statewide ADU law requires Yorba Linda to approve a qualifying accessory dwelling unit ministerial (by right), plus a junior ADU (JADU) on a single-family lot.
How big can an ADU be in Yorba Linda?
A detached ADU of at least 1,000 sq ft must be allowed, and an ADU of 800 sq ft can never be zoned out by floor-area or lot-coverage limits. A JADU can be up to 500 sq ft.
What are the setback requirements for an ADU in Yorba Linda?
Side and rear setbacks are limited to 4 ft. must meet front yard setback of zoning district.
Is parking required for an ADU in Yorba Linda?
Up to 1 space. No parking can be required within ½ mile of transit, for conversions, or for units inside the primary home. When a garage is converted, replacement parking is not required.
How long does ADU approval take in Yorba Linda?
A complete application must be acted on within 60 days, with ministerial (by right) — no public hearing or discretionary design review for a qualifying ADU.
Do I have to live on the property to build an ADU in Yorba Linda?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Yorba Linda Municipal Code, Article 9, Sections 18.20.800–18.20.870 (Ord. 2023-1106)
- § 18.20.830, § 18.20.850.D.2
- § 18.20.830.C, § 18.20.840.B
- § 18.20.850.D.1–2
- § 18.20.850.F
- § 18.20.850.C
- § 18.20.850.E, § 18.20.860.F
- § 18.20.850.E
- § 18.20.850.H, § 18.20.860.B
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66323 (by-right ADU/JADU, 800 sq ft, 4-ft setbacks)
- Cal. Gov. Code § 66333 (junior ADUs)
- Cal. Gov. Code § 66321 (size minimums & height)
- Cal. Gov. Code § 66322 (ADU parking; § 66334 covers JADU parking)
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- Cal. Gov. Code § 66311.5 (impact fees: none for an ADU ≤ 750 sq ft or JADU ≤ 500 sq ft)
Last updated 2026-06-25. This is an AI-assisted summary of Yorba Linda's ADU rules, drawn from its published ordinance and California ADU law — general information, not legal advice, and it may be incomplete or out of date. Verify the controlling rule for your specific parcel with Yorba Linda Planning before relying on it.
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