ADU Rules: Irvine vs Midway City
How do adu rules rules compare between Irvine, CA and Midway City, CA?
Midway City has fewer restrictions than Irvine.
Irvine, CA
Orange County
Irvine regulates accessory dwelling units under its Zoning Ordinance consistent with California Government Code Section 65852.2. ADUs are approved ministerially through a building permit on single-family lots, with detached units up to 1,200 square feet permitted by right.
View full Irvine rules →Midway City, CA
Orange County
Unincorporated Orange County allows ADUs on any residentially zoned lot under OC Zoning Code (Title 7, Division 9) and California Government Code §65852.2 (ADUs) and §65852.22 (JADUs). State law preempts most local restrictions: minimum 800 sqft, 16 ft height, and 4 ft side/rear setbacks must be allowed by right.
View full Midway City rules →Key Facts Comparison
| Fact | Irvine | Midway City |
|---|---|---|
| Max Size (Detached) | 1,200 sq ft | - |
| Max Height | 16 ft (detached) | - |
| Setbacks | 4 ft side and rear | 4 ft side/rear (state minimum) |
| JADU Max Size | 500 sq ft | - |
| Permit Type | Ministerial building permit | - |
| State Law | - | Cal. Gov. Code §65852.2 (ADU) & §65852.22 (JADU) |
| Local Code | - | OC Zoning Code Title 7, Division 9 |
| Max Detached ADU | - | 1,200 sqft |
| Max JADU | - | 500 sqft (within existing dwelling) |
| Height | - | 16 ft minimum allowed; up to 18-25 ft per state law |
| Parking | - | None required if within 1/2 mi of transit or garage conversion |
| Owner-Occupancy | - | Required when JADU is present (§65852.22) |
Highlighted rows indicate differences between cities.
Irvine FAQ
Do I need a special permit for an ADU in Irvine?
No conditional use permit is required. ADUs are approved ministerially through a building permit application using the RADU form and ADU Verification Form.
Can I convert my garage to an ADU in Irvine?
Yes. Garage conversions to ADUs are permitted by right under state law with no replacement parking required.
How do I apply for an ADU permit in Irvine?
Contact the Planning Team at planning@cityofirvine.org or (949) 724-6308 for application requirements.
Midway City FAQ
Can I build an ADU on my unincorporated Orange County lot?
Yes — state law (Cal. Gov. Code §65852.2) requires the County to allow at least one ADU on any lot zoned for residential use, including single-family and multifamily zones. Minimum lot size requirements are preempted.
Do I need to live on the property to rent out an ADU?
No owner-occupancy is required for a standalone ADU under §65852.2. However, if you build a JADU under §65852.22, the owner must occupy either the primary dwelling or the JADU.
How tall can my detached ADU be?
State law guarantees at least 16 ft. Properties within 1/2 mile of transit or on multifamily lots can go up to 18 ft (single-story) or 25 ft (two-story) per Gov. Code §65852.2(c)(1)(D).
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