How to inform tenants of constructing an ADU from garage

[Lawrence H.]

Hi BP Fam!

First post here. I have a 4BR that is fully rented out to college students. I'm trying to get approved on an ADU unit that would convert the garage into 2br / 2 bathrooms as well as an extention for a living room to help increase my rent. How should I inform my renters to maximize the chance that they will be onboard? Do I need a signed document from them saying that they agree? My concern is that they will say no since I am taking some of their garage but I was thinking of building an additional drive way to replacing their carpet with hardflooring. Please let me know of any thoughts!

Thanks!