Understand the local permitting requirements, keep eyes on your property to avoid squatters, and make sure you have a great vacant insurance policy while you're renovating.

Possibly already permitted outbuildings that already have plumbing such as workshops, offices, etc might be able to be converted to an ADU at a cost that does not result in the cost being more than the value added.Building an ADU is a lot of work and can be a slow process.  

I'd check local zoning ordinances to see what is permitted. 

For our ADU (garage conversion), I am handling the design/engineering and then selecting a final contractor once its permitted and ready to go. 

Ensure you understand local regulations regarding permits; it’s usually a good idea for your associates to form an LLC for liability protection, but individuals can do renovations as long as they pull the necessary permits.

Developers will not be able to get these bonus building permits without providing such TDR credits.  

@Phil SheltonYou would need a civil engineer to provide a drawing to get submitted to zoning and get a permit if it passes zoning is most common This also depends on the road - if it’s a state road forget it as it will take a year to get approved and cost a fortune - if it’s a local road process not as cumbersome but don’t expect this to happen quicklyIn some instances you may have to prepare sight distances etc to make sure it’s safe to add a curb cut

This is who will approve or deny your plans when you apply for a permit.

Does it require a highway occupancy permit if its on a state road, in my area it cost me around $1000 just to get the permitting and design for my driveway entrance.

It is quite rural and it is much easier to get a permit for these sorts of things if you even need one.