How to Get an ADU Permit in Riverside
📋 Key ADU Regulations in Riverside
To legally build an ADU in Riverside, you need to comply with state and city-specific zoning laws:
Zoning Requirements: Most single-family and multifamily zones allow ADUs.
Unit Size:
Detached ADUs: up to 1,200 sq. ft.
Attached ADUs: cannot exceed 50% of the primary home’s size
JADUs: up to 500 sq. ft.
Height Limits:
Detached ADUs: up to 16 ft (may be higher in some zones or if close to transit)
Setbacks:
Rear and side yard setbacks must be at least 4 feet
Parking:
No additional parking required if ADU is within ½ mile of public transit
Owner Occupancy:
JADUs require the owner to live on the property, but standard ADUs no longer do (per California law).
🛠️ Steps to Get an ADU Permit in Riverside
1. Confirm Zoning and Property Eligibility
Check your address with the City of Riverside Planning Department to ensure your lot is eligible.2. Choose a Design
Select from custom designs or use the city’s permit-ready ADU plans, which speed up the approval process.
3. Prepare Plans and Site Details
Work with a designer or architect to create:Site plan with setbacks
Floor plans and elevations
Utility connections
4. Submit to the City
Apply through the Riverside Public Permit Portal, uploading your full application and plans.5. Wait for Plan Review
The city will review your submission for compliance. Pre-approved plans are typically reviewed faster (within 2–10 business days).6. Pay Permit Fees
Fees vary based on the size and complexity of your ADU (see cost breakdown below).7. Receive Permit and Start Building
Once approved, you’ll receive your permit and can begin construction!💰 How Much Does an ADU Permit Cost in Pasadena?
| Permit Type | Fee Type | Estimated Cost |
| Additional Dwelling Unit (BRS-ADU) | Deposit | $5,353.56 |
| Permit Ready ADU (BRS-PRADU) | Deposit | $3,340.00 |
| Junior Accessory Dwelling Unit (BAR-JADU) | Deposit | $1,689.32 |
| Fire Mitigation Fee (per dwelling unit) | Fixed | $400.00 |
| Fire Mitigation Fee (per sq. ft.) | Fixed | $0.25 |
🌟 Benefits of Building a Permitted ADU
✅ Earn Passive Income
Rent your ADU to tenants for a steady monthly income.
✅ Increase Property Value
A legal ADU can significantly boost your home's resale value.
✅ House Family or Caregivers
Create private space for loved ones or aging parents.
✅ Legal Peace of Mind
Avoid fines or future issues by building legally.
✅ Tax Deductions
Interest and some construction costs may be tax-deductible.
