Everything homeowners need to know about building an accessory dwelling unit in Moreno Valley - size limits, setbacks, permits, and the city's own free pre-approved plans program.
Last verified: August 2026
7/10 · ADU-friendly, tightening up compliance
1,200 sq ft*
Max ADU size
16 ft*
Max height
Not required
Owner-occupancy
By-right
Permit type
This page summarizes Moreno Valley Municipal Code Section 9.09.130 (Accessory Dwelling Units), together with California's statewide ADU law (Government Code Sections 66310-66342), for general reference - it is not legal advice. The state has flagged parts of the local ordinance for correction (see the ordinance history section below), so always confirm current requirements with the Moreno Valley Community Development Department before designing or applying for permits. See sources below.
Zoning & size requirements
What you're allowed to build
ADU type
Max size
Max height
Notes
Detached (new construction)
Up to 1,200 sq ft
16 ft standard; state law requires 18 ft (plus 2 ft for a matching roof pitch) within a half mile of a major transit stop - a point the state flagged the city's ordinance for missing on multifamily lots
4 ft minimum side and rear setbacks
Attached / interior conversion
The city's ordinance lists 850 sq ft (one bedroom) or 1,000 sq ft (two or more bedrooms), though state reviewers found this table may improperly cap some conversions below what state law allows
Within the existing or proposed primary structure
Common approach for garage or interior conversions
Junior ADU (JADU)
Up to 500 sq ft
Within the existing or proposed single-family home
Owner-occupancy required only if sanitation facilities are shared with the primary home
Allowed zoning districts
Lots zoned for single-family or multifamily residential use, citywide. Confirm your parcel's zoning district with the Community Development Department.
Additional standards
Setbacks, parking & other rules
Setbacks
No more than 4 ft from side and rear property lines for a new detached ADU, per state law
Parking
Generally 1 space per ADU, waived under state-listed exemptions such as proximity to transit; no additional parking required for JADUs
Units per lot
One ADU plus one JADU permitted on a qualifying single-family lot, in addition to the primary home; multifamily lots can add more under statewide SB 1211
Owner-occupancy
Not required for a standard ADU under statewide law (AB 976, effective January 1, 2024). A JADU requires it only if it shares sanitation facilities with the primary home.
Building code
Must meet the 2025 California Building Code, which took effect for new applications on January 1, 2026 under the city's Ordinance No. 1033
Rental rules
No separate ADU-specific rental license identified; standard California landlord-tenant law applies. Confirm any short-term rental rules separately if that's the plan.
Ordinance history
How Moreno Valley's ADU rules got here
2017Statewide by-right ADU law takes effect. California Government Code Section 65852.2 begins requiring cities, including Moreno Valley, to approve most ADUs ministerially.
Jun 2023Ordinance No. 999 adopted. Moreno Valley's current ADU ordinance, codified at Municipal Code Section 9.09.130, was adopted June 20, 2023.
Dec 2024HCD review finds compliance gaps. The California Department of Housing and Community Development sent the city written findings identifying more than a dozen places where the ordinance's language did not match current state ADU law - including outdated code references, a bedroom-based size table that may over-restrict conversions, and an 18 ft transit-proximity height allowance the ordinance had missed. The city was given 30 days to respond and is expected to bring the ordinance into line.
Dec 2024"ADU for You" program launches. The city rolled out seven free, pre-approved detached ADU plans, from 306 sq ft studios up to a 988 sq ft three-bedroom design, so homeowners can skip the cost of hiring an architect.
Jan 20262025 California Building Code takes effect. Adopted locally via Ordinance No. 1033, applying to all new permit applications including ADUs.
Worth knowing: unlike some California cities that have resisted state ADU mandates, Moreno Valley's compliance gaps found in the December 2024 HCD review read as drafting and cross-reference issues in a fast-evolving area of law, not deliberate restrictions - and the city's free pre-approved plans program suggests it's trying to make ADUs easier to build, not harder.
Permit process
How Moreno Valley ADU permitting works
1
Decide: custom design or a free pre-approved plan
Consider the city's "ADU for You" program - seven free pre-approved detached ADU designs ranging from a 306 sq ft studio to a 988 sq ft three-bedroom unit - which can skip the architect fee and speed up review.
2
Confirm your lot's eligibility
Pre-approved plans require a residential lot with an existing single-family home or duplex, and can't be in a geo-hazard, landslide, flood, or Wildland-Urban Interface zone.
3
Prepare your submittal
The city provides checklists specifying minimum plan requirements for attached ADU, detached ADU, and JADU submittals.
4
Submit for ministerial review
State law requires a decision within 60 days of a complete application; incomplete applications get a written list of deficiencies.
5
Pay fees and pull your building permit
Building permit fees follow the city's standard fee schedule; ADUs under 750 sq ft are exempt from most local impact fees under state law.
6
Construction & inspections
Schedule the standard framing, plumbing, electrical, and final inspections as construction proceeds. New applications must meet the 2025 California Building Code, effective January 1, 2026.
Fees and timelines are approximate - confirm current figures with the city's Building and Safety Division at permitcounter@moval.org or 951-413-3000.
Budgeting
What it costs to build an ADU in Moreno Valley
Garage conversion
Roughly $65,000-$150,000, the least expensive path since the shell already exists
Basement conversion
Uncommon in this part of California; where feasible, roughly $95,000-$190,000 based on regional contractor estimates
New detached ADU (custom design)
Roughly $140,000-$260,000, generally lower than coastal Southern California cities thanks to lower inland labor and land costs
New detached ADU (city pre-approved plan)
Using one of the "ADU for You" free plans can cut design costs entirely, leaving mostly construction and permit costs
Permit fees
Follow the city's standard building fee schedule; ADUs under 750 sq ft are exempt from most local impact fees under state law
These are general ranges from local contractor estimates and regional reporting, not quotes - actual cost depends heavily on lot conditions, finishes, and whether you use a custom design or one of the city's free pre-approved plans.
Before you apply
Tips for a smooth approval
Look at the "ADU for You" pre-approved plans first. Seven free designs from 306 to 988 sq ft can save you the cost of an architect and speed up your review.
If you're within a half mile of a major transit stop, ask about the taller height allowance. State law allows 18 ft (plus 2 ft for a matching roof pitch) in that case, even though the city's own paperwork has lagged behind on this point.
Don't assume the ordinance's bedroom-based size table is the last word. State reviewers found it may improperly cap some interior conversions - if your project seems boxed in below what state law allows, ask the city to explain how it applies to your unit.
Check whether your lot is in a geo-hazard, flood, or Wildland-Urban Interface zone before counting on a pre-approved plan. Those areas are excluded from the pre-approved plan program and will need a custom design.
Keep new construction at or under 750 sq ft if avoiding impact fees matters to you. Crossing that threshold can trigger proportional local impact fees.
FAQ
Common questions
Do I need to live on the property to build an ADU in Moreno Valley?
No. California law (AB 976, effective January 1, 2024) permanently bars cities from requiring owner-occupancy for a standard ADU. A Junior ADU still requires owner-occupancy only if it shares sanitation facilities with the primary home.
What's the maximum size for a detached ADU in Moreno Valley?
Up to 1,200 sq ft for new detached construction, with a 16 ft height limit that state law bumps up to 18 ft (plus 2 ft for a matching roof pitch) within a half mile of a major transit stop.
What is the "ADU for You" program?
A City of Moreno Valley program, launched in December 2024, offering seven free pre-approved detached ADU plans ranging from a 306 sq ft studio to a 988 sq ft three-bedroom design. Using one as-is can save the cost of hiring an architect and speed up permitting, as long as your lot isn't in a geo-hazard, landslide, flood, or Wildland-Urban Interface zone.
Do I need extra parking for an ADU?
Generally one space is required, but that's waived under state-listed exemptions such as being within a half mile of transit. JADUs don't require additional parking.
How long does the permit process take?
State law requires a decision within 60 days of a complete application. Using one of the city's pre-approved plans can help your project move through review faster since the design itself doesn't need re-review.
How much does an ADU cost to build in Moreno Valley?
Garage conversions tend to run roughly $65,000-$150,000, and a custom new detached unit $140,000-$260,000, based on local contractor estimates and regional reporting - generally lower than coastal Southern California cities. Using a free city pre-approved plan can eliminate design costs.
Is Moreno Valley's ADU ordinance fully compliant with state law?
Not entirely, as of the most recent state review. In December 2024, HCD sent the city written findings identifying more than a dozen places where the ordinance text didn't match current state ADU law - mostly outdated references and language issues rather than outright bans - and directed the city to correct them. Ministerial review under state law still applies regardless, but it's worth confirming current standards directly with the city.
Can I add multiple ADUs if I own a multifamily property in Moreno Valley?
Yes. Under statewide SB 1211 (2024), owners of existing multifamily properties can add up to 8 detached ADUs on one lot, plus interior conversions of a share of existing units, subject to the city's standards.
