I got a response regarding JADU
Our ordinance includes this limitation on where a JADU may be located. Carports are not within the walls of the residence, and neither are detached garages. For these reasons, if you want to convert a portion of your home into a JADU, it has to be within the house. You mention constructing a new second story to accommodate the JADU – only 150 square feet of new construction is allowed to facilitate ingress and egress for JADU conversions. JADU’s are meant to be a conversion of part of the main house, and not meant to be new construction. In order to do this, you would need to apply to build the 2nd story first, connected to the main home, then once the permit is finaled, you would apply to convert up to 500 square feet of that space into a JADU with a separate entrance.
Hope this helps.
You would need to submit plans for the second story, go through plan check, get a permit, build, have that permit finaled, then come back to us with the plans to convert.
One thing I want to make clear is that the new addition must be interior connected to the house, but in order to qualify as a JADU when converted, will need an additional entry. You could provide both with the addition, then seal off the interior connection and only use the additional entry when converted.