Why does a mixed-use building need separate utility metering and what happens if it doesn't have it?

A mixed-use building combining ground-floor retail with residential units above typically needs separate utility metering for each unit or component so that electricity, gas, and water usage can be billed accurately to whoever actually used it, rather than lumped together across very different types of occupants with very different consumption patterns. Without separate metering, there's no clean way to know how much a specific retail tenant or a specific residential unit actually used, which creates real billing and fairness problems.

When a building lacks separate metering, the landlord is generally left to either absorb utility costs into rent, which can misprice the lease compared to a similar separately metered building, or attempt to estimate and allocate costs after the fact, which tenants can reasonably dispute since it isn't based on actual measured use. This can also create friction with utility providers and complicate compliance with municipal or building requirements that increasingly expect individual metering in multi-unit buildings.

A buyer looking at a mixed-use property without separate metering should treat it as a real due diligence flag, understanding the cost and feasibility of retrofitting separate meters, and factoring that into the purchase price or renovation budget, rather than assuming it's a minor detail.