One of the easiest conversions aside from a basement to accessory dwelling unit is a garage to accessory dwelling unit. What is nice about this conversion is that a garage will already contain electrical and water hookups as well as other infrastructure that makes the conversion simpler. The best way to get a conversion done right is to first start with a general contractor who could help you come up with some plans for what you would like your new accessory dwelling unit to look like. You will have to treat the process just like any basement finishing process and consider waterproofing, insulating, drywall, flooring, ceilings, light, etc. A garage to ADU conversion can be a fun and exciting activity that will be rewarding down the road.