ADU permit guide for Mission Viejo, California
Orange County, California
Use this page for early ADU permit planning in Mission Viejo. A verified local process guide is not available yet, so confirm every step and fee with the city before you submit.
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Estimated permit fees by size
8 fee lines · low to high
| ADU size | Estimated fees |
|---|---|
| 400 sq ft | $7,600 – $25,900 |
| 500 sq ft | $7,600 – $25,900 |
| 749 sq ft | $7,600 – $25,900 |
| 750 sq ftimpact-fee threshold | $7,600 – $25,900 |
| 751 sq ft | $7,600 – $25,900 |
| 1,000 sq ft | $7,600 – $25,900 |
| 1,200 sq ft | $7,600 – $25,900 |
Getting the permit
We have not written Mission Viejo’s permit guide yet. The official sources below are the right place to start.
Read before you budget
- Most fee lines are working estimates rather than verified published city rates. Confirm every line with the city before budgeting.
- Totals do not vary by ADU size for this city, so the size selector will not change the estimate.