California ADU rules · Riverside County
Can I Build an ADU in Eastvale?
Yes — you can build an ADU in Eastvale. California's statewide ADU law requires every city, including Eastvale, 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
CA state lawYes — by right
ADUs and JADUs are allowed by right in all residential and mixed-use zones; ministerial approval, no hearing.
Units on a single-family lot
Local rule1 detached ADU + 1 attached/converted ADU + 1 JADU
Allows both 1 detached and 1 attached/converted ADU plus 1 JADU per single-family lot.
Units on a multifamily lot
Local ruleAt least 1 attached (up to 25% of units from non-livable space) + up to 8 detached (not to exceed number of existing units); up to 2 detached if proposed multifamily
Detached ADUs on existing multifamily lots capped at number of existing units, up to 8; only 2 detached allowed for proposed multifamily.
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 rule850 sq ft
850 sq ft for 1 bedroom or less; 1,000 sq ft for 2+ bedrooms. This is a local cap above state minimum.
Max attached ADU size
Local ruleLesser of 50% of primary dwelling or 850/1,000 sq ft (see detachedMaxSqft), whichever is less
Attached ADU size is capped at 50% of primary dwelling or 850/1,000 sq ft, whichever is less.
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
Local rule16 ft
Detached ADU: 16 ft standard; 18 ft if on multifamily lot or near transit; +2 ft for matching roof pitch. Attached/converted: up to 25 ft or primary dwelling height, max 2 stories.
Setbacks
Side setback
Local rule4 ft
4 ft minimum for new construction; conversions may have zero setback if in same location/dimensions as existing structure.
Rear setback
Local rule4 ft
4 ft minimum for new construction; conversions may have zero setback if in same location/dimensions as existing structure.
Front setback
Local ruleNo explicit minimum; generally must be to side or rear unless state '66323' criteria met
Front yard ADUs allowed only if meeting state criteria; otherwise, must be to side or rear.
Separation from main house
Local ruleNone required
No explicit separation required; must comply with building/fire code.
Parking
Parking required
CA state lawUp to 1 space
At most 1 space per ADU (or per bedroom, whichever is less) — and waived in the common cases below.
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
CA state lawNot required
When a garage/carport is demolished or converted to build an ADU, replacement parking cannot be required.
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 only for JADUs that share sanitation with primary dwelling.
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
Local ruleBuilding permit, ADU permit (unless applying under state '66323' criteria)
Both building and ADU permits required unless applying under special state criteria.
Eastvale-specific factors that can change the answer
State law sets the floor, but these local conditions often decide whether a specific parcel works.
Sprinkler and emergency access requirements
Sprinklers required only if primary dwelling requires them; all-weather emergency vehicle access required.
Eastvale sets a local cap of 850 sq ft (1 bedroom) or 1,000 sq ft (2+ bedrooms) for detached and attached ADUs, and allows both a detached and an attached/converted ADU plus a JADU on single-family lots. Height and multifamily rules are locally specified and more detailed than state minimums.
Frequently asked questions
Can I build an ADU in Eastvale?
Yes. California's statewide ADU law requires Eastvale 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 Eastvale?
A detached ADU of at least 850 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 Eastvale?
Side and rear setbacks are limited to 4 ft. No explicit minimum; generally must be to side or rear unless state '66323' criteria met.
Is parking required for an ADU in Eastvale?
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 Eastvale?
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 Eastvale?
Owner-occupancy: only for a jadu. ADUs under 750 sq ft are also exempt from impact fees.
Sources
- Eastvale Municipal Code, Chapter 120.04.010 (amended 1-10-2024)
- §120.04.010(d)(1)a–c
- §120.04.010(d)(1)d
- §120.04.010(d)(2)a–b; Table in §120.04.010(f)
- §120.04.010(d)(2); Table in §120.04.010(f)
- §120.04.010(d)(13)
- §120.04.010(d)(7)
- §120.04.010(f) Table
- §120.04.010(f)(5)
- §120.04.010(b)(1), (f) Table
- §120.04.010(d)(9)-(10)
- Cal. Gov. Code §§ 66310–66342 (ADU Law)
- HCD 2025 Accessory Dwelling Unit Handbook
- Cal. Gov. Code § 66317 (ministerial approval, 60-day deadline)
- 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 § 66314 (local ordinance standards)
- 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 Eastvale'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 Eastvale Planning before relying on it.
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