If you have a sizable garage that you don’t need for storage, it’s possible to convert it into an accessory dwelling unit. In some areas, it is required that the garage is detached from the main house in order for it to be suitable for an ADU conversion.
This can be a convenient and cost-effective option if you are looking to add an ADU to your property. It’s often a great route if you have a large garage but don’t have the room to extend your house or build a detached unit in your yard. However, if the structure is in very poor condition or not up to code, the conversion can cost just as much as it would to demolish the garage and build a new unit in its place.
This article from Maxable lays out the key questions to ask when considering converting your garage into an ADU: https://maxablespace.com/how-to-convert-your-garage-to-an-adu/