Not Sears, but I just spent a fun few moments looking up “adu kit” “cabin kit” “house kit” “home kit” and “prefab home kit.”
There’s not room to build one inside my little condo, but lots of choices if you have a place to put one.
Depending on what kind, I have the room to add as many as 3, but the problem here is city restrictions limit them to BACK yards only, not front yards. :( I have no back yard, it’s ALL front yard.
What if you build one larger or at least wider than your house so it becomes the main dwelling and your house is the ADU?
Redefine your house as the ADU and the new unit as the house!
spoiler
(It probably won’t work because of rules saying that ADUs must have less square footage than the house and that the total must not exceed some floor area ratio for the whole lot, but it’s a fun thought.)
There would probably be some nightmare with changing the address as well because the new unit(s) would be between the existing house and the street where the address is. Apparently your street address is determined by where your front door faces.
One more thing to figure out. LOL.