Should I add a second meter?

[Nic Hill]

Hey guys, I'm going to rent out my 2 story house after the holidays. Downstairs to a small family and upstairs to a single mother/father. Both will have separate entrances and separate yard space. Would it be wise to add a separate meter to the upstairs unit? Does anyone know the California laws regarding this? Would I have to do this? Or build the estimated utilities into the rent? It's not technically a ADU since it's attached to the house.