Can I add an ADU as a second story on an existing single family residence or detached garage?

Yes, provided the existing single family residence or detached garage meets setback requirements and the ADU meets certain development standards. While detached garages in many instances have been constructed within close proximity to side and/or rear property lines, the construction of a two-story structure with an ADU as the second story must meet all applicable setback requirements, such as a 10-foot exterior side yard setback, 5-foot interior side setback, and 5-foot rear yard setback. WMC § 14-23.030 and WMC § 14.40.030(a)(3) 

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1. What is an ADU?
2. Do ADU/JADU projects require a public hearing for approval?
3. Is there a minimum lot size requirement?
4. Can minimum and maximum unit sizes be established for ADUs?
5. Can I create an ADU if I have multiple detached dwellings on a lot?
6. Can I add an ADU as a second story on an existing single family residence or detached garage?
7. Can parking requirements exceed one space per unit or bedroom?
8. Is replacement parking required for a garage conversion?
9. Are JADUs allowed in detached accessory structures?
10. Are there any owner-occupancy requirements for JADUs?
11. Are two JADUs allowed on a lot?