Awesome, thanks for the links K-ice. Sorry HipGnosis, you'd calculate the ROI on using the garage suite as storage? I'm not quite following. I'm thinking for me that once I acquire some more advanced carpentry skills that it would be a project to do when FIRE'd. My plan would to hit my number and know how much the project would cost roughly, work additionally for the project cost and then build after that. Long term this would be potential housing for family. I think a garden suite would make more sense in my case because it would be occupied most likely by someone with an intellectual/physical disability - a long flight of stairs wouldn't be ideal.