Handling utilities for multiple "units" in a single family home

[Benjamin Lenz]

Hey there, BP! I'm house hacking my SFH in Walnut Creek, CA. I live in the attached ADU above the garage, which has a private entrance. The main house where my tenants live also has a private entrance. Currently splitting utilities with them has been fairly simple but I'm considering converting my garage into an additional ADU, effectively "triplexing" my home. This will clearly make utilities more complicated to split with that third unit, and even more so when I eventually move out and I'm renting three private units in one SFH that isn't submetered. If you have any advice or suggestions on the best way to tackle this I would be most grateful! Thanks,

Ben