ADU construction plans - software

[Zachary Moore]

I have two properties with currently un-permitted ADUs (

1. 600ft^2 of a 2100ft^2 SFH in the county of Santa Barbara CA. It has been a functioning ADU for 6 years and there were no modifications to the exterior and only a gas line added for a stove and dry walling up and doorway in the interior. I'd like to get it permitting while things have more streamlined.
2. An outbuilding (workshop and detached garage) on a SFH also in SB county that is already plumbed with a 1/2 bath, wired with a 30 A sub-panel, and has finished ceiling/walls in the workshop. It needs a kitchen, a couple of windows added and permanently closing the garage door.

What software programs do you recommend to put together designs for these ADU's that I could take to the county planning commission. Also, is there a place to find examples of construction plans for similar projects, so I can better understand to scope of what is required. I assume I can go look stuff up with the county, but things are still locked down around here.