What Is RUBS? Ratio Utility Billing Explained for Apartments

What RUBS means, in plain terms

In a master-metered building, the utility company reads one central meter for the entire property. The city or utility company bills the property owner directly. For years, owners covered these charges by rolling an estimated utility cost into base rent. When water rates or electric tariffs jump, the owner absorbs the loss until leases renew.

A ratio utility billing system changes that structure. Under a RUBS program, the property owner takes the master-meter bill, subtracts common-area utility use, and divides the remaining residential cost among tenants through a monthly invoice.

Residents pay for utilities as a separate line item rather than a hidden cost inside rent. Because there are no physical submeters inside walls or utility closets, RUBS billing relies purely on operational data. The math divides the bill using factors tied to normal utility consumption.

How a RUBS formula works

Every RUBS allocation formula relies on measurable property records. The formula distributes expenses so heavier utility users pay a larger share of the master bill.

• Occupant count. The utility bill is divided based on how many authorized people live in each apartment. This factor works well for water and sewer because personal habits drive volume. A unit with four people naturally uses more water for showers, dishes, and laundry than a unit with one resident.
• Square footage. The bill is divided based on the finished interior area of each apartment. This factor is common for heating and cooling utilities. Larger apartments require more power or gas to heat and cool than smaller layouts.
• Bedroom count. The property uses floor plans as a proxy for both size and expected occupancy. A three-bedroom apartment receives a higher ratio weighting than a studio or one-bedroom unit.
• Combination formula. Many apartment communities blend two variables. For example, a water formula might lean mostly on occupancy and partly on square footage, so both household size and apartment size count.

Consider a simple, hypothetical building with four units and a net master water bill of $400 after removing common-area deductions. In this example, the property allocates the bill entirely by occupant count.

The math is open and easy to verify. The total billed back across all units equals the residential portion of the original utility invoice.

Common-area deductions and eligible utilities

RUBS usually recovers less of the bill than meters do (70 to 85 percent vs 85 to 95). The total billed to residents never exceeds the property master-meter cost, and owners must account for non-residential usage.

Before any ratio calculation happens, common-area use is deducted from the master invoice. This covers irrigation systems, clubhouse restrooms, swimming pools, on-site leasing offices, and common laundry facilities. If a clubhouse or irrigation system has its own dedicated meter, that meter is excluded from the calculation. If common areas share the master line, a fixed deduction percentage is subtracted from the gross total before resident shares are calculated.

RUBS can cover multiple utility types where state and local codes allow:

• Water and sewer. The most frequent use case for ratio billing in multifamily housing.
• Trash and recycling. Often allocated evenly per unit or by bedroom count.
• Gas. Commonly allocated by square footage for shared boiler heating or central hot water lines.
• Electric. Allocated by square footage, though restricted or barred in certain jurisdictions.

Does RUBS save money?

RUBS creates financial value through utility cost recovery and resident conservation.

First, your property stops absorbing utility rate hikes. When city water or electric providers raise rates, those expenses pass through to the residential utility allocation. RUBS typically recovers about 70 to 85 percent of the master utility bill. By comparison, physical submetering recovers about 85 to 95 percent. The recovered money stays with the property, which raises net operating income.

Second, billing residents drives real conservation. Once residents pay for their own water, water use typically drops 15 to 30 percent. When water is free, a running toilet in an empty bathroom or a dripping kitchen faucet can go unreported for months. When residents see that higher utility use increases their monthly bill, they report leaks quickly and watch their consumption.

Submetering measures actual gallons or kilowatt-hours at the wall, while RUBS estimates usage based on averages. You can compare specific outcomes using our RUBS vs submetering calculator.

Pros and cons of RUBS

Ratio allocation comes with specific trade-offs that every property manager should review.

Advantages of RUBS:

• Zero equipment cost. There are no physical meters to purchase, plumb, or wire.
• Fast start. A RUBS program can go live in about 30 days once lease terms allow.
• Immediate recovery. Utility cost recovery starts with the very first billing cycle.
• Fits complex plumbing. Older buildings with shared vertical risers can allocate utility expenses without opening walls.

Disadvantages of RUBS:

• Lower recovery rate. RUBS recovers 70 to 85 percent of costs, which is lower than the 85 to 95 percent typical of submeters.
• Resident pushback. Residents can see RUBS as less fair than meters, because a careful household pays for a wasteful neighbor.
• Legal limits. Some states and cities ban ratio billing for specific utilities or add detailed administrative rules.
• No automatic leak detection. Without submeters reading flow data every few hours, a running toilet can run up bills until the city invoice arrives.

Is RUBS legal?

RUBS is common, but the rules vary across state lines, counties, and individual cities. You cannot use a formula without checking local utility rules first.

State utility commissions and local tenant housing codes govern whether ratio billing is permitted, which utilities can be billed, and what paperwork is required. Some states restrict ratio billing for electric and gas service entirely. California, for example, does not allow RUBS for electric or gas. Texas has its own RUBS rules, covered in our guide to Texas RUBS rules, and Virginia has its own as well (Virginia submetering and RUBS laws).

The lease has to disclose the method. Do not bill a RUBS charge the lease does not explain. The lease or utility addendum must state the formula factors, specify which utilities are included, list any administrative fees, and outline common-area deductions. When converting an existing master-metered property, owners phase in RUBS as leases come up for renewal, or roll it out across the property through signed lease modifications where local laws allow.

NES tracks state, county, and city utility rules in more than 43 states through our in-house compliance team. We check the legal requirements for your property address before recommending a billing program. NES's president serves on the board of the Utility Management and Conservation Association. Our page on submetering laws covers the wider rules.

RUBS or submetering: when each fits

Deciding between a ratio formula and physical meters depends on building plumbing, budget, and local laws. To review mechanical differences between systems, see our comparison of submetering vs RUBS.

Related questions

• Submetering vs RUBS: Cost, Fairness and Which to Pick
• Is Submetering Legal? Rules by State and Utility
• Does Submetering Save Money? ROI for Apartment Owners
• What Is Submetering? Meaning, How It Works and Who Pays