Is an ADU worth it? (los angeles county)

[Carmela Zaragoza]

hello! would it be worth it to do an ADU conversion on a garage if the use would be for a home office/storage? the garage already has a bathroom but no permits. we have no plans of renting it out, it would only be for personal use. we're planning on selling the house within 7-10 years, So I am more wondering on the ROI end of things. thank you so much!