All inclusive rent calculation approach SFH & finished basement

[Sebastian Villa]

Hey BP community,

I currently live in a single family home with a finished basement that has its own door and bathroom. I would love to add a small kitchen down in the basement and rent the two as separate units. The problem is that the utilities for both the basement and the rest of the house are on the same meter. My questions are:

Does any one have a good approach to calculate an all inclusive rent for the separate units? 

Any experience with adding meters and separating utilities for the two?

Thanks in advance for any help/advice