How to Get an ADU Permit in Irvine, California
📋 Key ADU Regulations in Irvine
Irvine follows California state law, with some local requirements. Here's a summary of current ADU regulations:
✅ Zoning: Most residential zones (RS, R-1, R-2, etc.) allow ADUs
🏠 Size Limits:
Detached: Up to 1,200 sq ft
Attached: Up to 50% of the main home, or 800 sq ft minimum
🚗 Parking: No parking required if within ½ mile of transit or if converting a garage
🏗️ Height Limit: Up to 16 feet (more allowed with conditions)
📍 Setbacks: 4 feet side and rear setback minimum for detached ADUs
🧾 Permits: Both building and planning permits are required
🛠️ How to Get an ADU Permit in Irvine: Step-by-Step
1. Check Eligibility
Use Irvine’s zoning map or contact the Community Development Department to verify your property is eligible.
2. Choose the Type of ADU
Detached ADU
Attached ADU
Garage conversion
Junior ADU (JADU) (interior conversion, max 500 sq ft)
3. Hire a Professional
Work with an architect, designer, or design-build firm familiar with Irvine zoning and building codes.
4. Prepare Plans and Documentation
You’ll need site plans, elevations, floor plans, Title 24 energy forms, and more.
5. Submit to the City of Irvine
Apply for permits through Irvine’s Permit Processing System.
City departments (planning, building, engineering) will review and provide comments.
6. Respond to Corrections
Revise plans if needed. The city typically responds within 60 days, as required by law.
7. Receive Your Permits
Once approved, pay fees and receive your building permit to begin construction.
8. Build Your ADU
Use licensed contractors and schedule required inspections (foundation, framing, final).
💰 How Much Does an ADU Permit Cost in Irvine?
| Permit/Service | Estimated Cost |
| Building Permit | $1,500 – $4,000 |
| Plan Review Fee | $700 – $2,500 |
| School Impact Fee (if >750 sq ft) | ~$3.75 per sq ft |
| Sewer/Water Connection | $1,000 – $3,000+ (varies by utility provider) |
| Fire & Engineering Reviews | $300 – $1,000 |
| Total Estimated Cost | $4,000 – $12,000+ |
🌟 Benefits of Building a Permitted ADU in Irvine
✅ Earn Passive Income
With Irvine’s strong rental market, ADUs offer high ROI and stable rental demand.
✅ Flexible Living Space
Great for multi-generational living, guests, remote work, or even future downsizing
✅ Boost Property Value
Well-built ADUs can increase your home’s resale value by 20–30%.
✅ Stay Legal and Insured
Permitted ADUs meet building, fire, and energy codes—avoiding future penalties or insurance issues.
✅ Future-Proof Investment
With ongoing housing demand in Orange County, ADUs provide long-term value and options.
