ADU permit process in Mission Viejo, California
Orange County, California
Prepared by GetYourPermit editorial teamReport an error
We haven’t written Mission Viejo’s permit guide yet.
We publish permit process guides one city at a time, and we would rather publish nothing than guess at Mission Viejo’s rules using another city’s process. Permit steps, submittal requirements, and review timelines are set locally, so a guide copied from a neighboring city would be wrong in ways that cost you time.
Here is what is useful for Mission Viejo right now.
See the fee estimate for Mission ViejoStart here instead — official and primary sources for Mission Viejo
The current City Building Services page links the fee schedule effective April 1, 2023 and directs applicants to Client Self Service to submit plans, pay fees, and request inspections.
Accessed August 28, 2026
The schedule publishes a $155 hourly plan-check rate, state SMIP formula, and project-specific construction-and-demolition charges. PDF extraction does not preserve the association of every unlabeled calculation value with its row, so only unambiguous rows are recorded numerically.
Accessed August 28, 2026
The official City page confirms that the public portal is live and exposes a Fee Estimator. Its permit types include 'Accessory Dwelling Unit (ADU) / Junior Accessory Dwelling Unit' and require square feet, valuation, and application date before producing an estimate.
Accessed August 28, 2026
What to ask the Mission Viejo building department
- The current building permit fee schedule, and the date it took effect.
- Whether development impact fees apply at your square footage — many California cities waive them for ADUs of 750 sq ft or less.
- Plan submittal requirements: what drawings they expect, in what format, and whether submittal is online or in person.