Separate Utilities for Tenants: The Operating Decision

Module 7.2 covered the hardware decision during design. This is the operating decision — what landlording each option feels like monthly, now that a real tenant pays real bills. (If you're still pre-construction: this lesson is why 7.2 told you to decide early.)

Option 1: Flat fee / utilities-included. One number in the lease ("rent $2,300 including utilities" or "+$175/month utilities"). Monthly effort: zero. The trade: you carry usage risk — the tenant who mines cryptocurrency or loves 65°F summers is on your bill. Mitigations: set the flat fee from a few months' real data, reserve the right to revisit annually in the lease, and remember your efficient Title 24 building (9.4's quiet upside) caps the realistic damage — small, tight, heat-pump-equipped units just can't consume that much. Best for: simplicity-first landlords, family tenants, JADUs and small studios.

Option 2: Submeter pass-through. Your private meter (7.2) reads actual usage; you bill it monthly. Monthly effort: real but small — read, calculate at the utility's rate, invoice with the reading shown. California rules for submetered billing are strict on transparency: pass through at cost, no markup, documentation on request. Best for: owners who value precision, larger units where usage genuinely varies, multi-unit situations (13.4–13.5) where fairness between tenants matters.

Option 3: Separate accounts. The tenant signs up with the utility directly (the meter from 7.2's option 3); their usage, their bill, their name. Monthly effort: zero, forever — plus deposits, shutoffs, and rate disputes are entirely between tenant and utility. Best for: the long-haul rental asset; also the cleanest arrangement at turnover (no final-bill proration dance).

Water, trash, internet — the supporting cast: water is rarely separately metered for ADUs (flat-fee or included is the norm; note that landlords typically keep landscaping water on their side either way); trash service is usually per-property (included; specify bin arrangements in the lease per 14.1); internet is best left tenant-arranged (their plan, their name — just make sure design left a conduit, 7.5's cheap-trench wisdom).

The lease language rule for every option: whatever the arrangement, write it as mechanism, not vibes — who pays what, measured how, billed when, adjusted how. Utility ambiguity is the most common small-landlord dispute, and it is 100% preventable with one clear paragraph.