Considering house remodeling and adding ADU (Cupertino, CA)

[Ednan Khera]

Hello,

New here. Looking to remodel my single story house not far from the original Apple campus, and I'm in contact with a ADU company. The ADU did a site visit, and the takeaways included adding a second story would be significantly more complex and expensive than a backyard ADU. The initial sketch proposal is for a backyard ADU, probably would be a one bedroom construction. The location is quite desirable and very close to high performing Cupertino schools.

I am leaning towards and would like to retire early and eventually rely on passive streams/investments and ditch my 9-5 within a few years. I have no debt/mortgage, house was purchased nearly 40 years ago and was long paid off. Anyone here have experience with this particularly around my location/Silicon Valley? Trying to figure what my budget might be and get a better warm and fuzzy if this will be worth the investment. Hope this is in the right forum. 
  

[Jay Hinrichs]

seems to me any improvement in Cupertino would be worth while.  I am class 1974 Cupertino high.