The time it takes to get an ADU permit in California can vary significantly depending on the specific location and requirements of the project. It's typical to see anywhere from thee to nine months to complete the permitting process.
In the City of Riverside, any residential property can add at least one Accessory Dwelling Unit, per State law. Properties developed with single-family homes can also add a Junior Accessory Dwelling Unit.
On average, homeowners can expect to spend anywhere from $3,000 to $10,000 on permit fees for an ADU project in Riverside County.
Projects that DO NOT need a building permit are simple surface (cosmetic) projects; minor repairs and replacements; and minor site improvements or small structures.
Before you can start building your ADU, you will need permission from your local planning department. These permissions are called permits, and their costs vary depending on your location. Building permits range from $2,000 to $10,000, whereas city fees can range from $3,000 to $11,000.