Pros and Cons ADU vs JADU in California after 2020 new ordinance

[Jeff Cliff]

Hello,

I am looking to convert an existing area into attached ADU in California. In my current proposed plans, the size of this existing room with the addition of new bathroom and new closet turns out to be around 564 sqft. So essentially, I am just over 65 sqft more than Junior ADU (JADU). Currently, I don't have budget to make this Attached ADU bigger. However, the lot size is huge and in future, it maybe possible to put a detached 1200 sqft ADU in the backyard.

I am trying to figure out pros and cons of converting this existing space with the addition of bathroom & closet into a JADU vs attached ADU.

My understanding is if you have JADU you can add another detached ADU. However, not sure if I can have an attached 564 sqft ADU (not JADU) and another detached ADU in future. Moreover, I am not sure if I would need to separate service lines if I go with 564 sqft attached ADU. Is it worth to have 65 sqft more now and possibly not be able to build detached ADU in the future? Not sure what other things I should consider if any?
Thanks in advance.