RUBS Multifamily Guide for Property Owners and Managers
- 4 hours ago
- 6 min read
Utility costs aren’t what they were a few years ago. According to Time, the average residential electricity bill increased from about $121 in 2021 to $156 in 2025, nearly a 30% jump.
Water and sewer rates continue to rise, putting additional pressure on multifamily property owners who cover master-metered bills.
To recover those expenses, many turn to a ratio utility billing system (RUBS). But does RUBS multifamily billing actually reduce waste, or does it simply divide the bill differently?
Here’s what you need to know before you decide.
TL;DR
RUBS multifamily billing divides a master utility bill using a formula instead of actual usage data.
Residents are charged based on occupancy, square footage, or fixed percentages.
RUBS can recover utility expenses, but it doesn’t lower total property consumption.
Submetering measures unit-level usage and encourages conservation.
DrizzleX fixture-level submetering helps properties save 20–40% on water costs.
What Is RUBS Multifamily Billing?
In a RUBS multifamily setup, the property receives one master utility bill and divides that total among residents using a preset formula. It doesn’t measure individual unit utility usage.
Instead, total utility charges are allocated based on factors such as:
Unit occupancy
Unit square footage
A fixed percentage assigned to each apartment
This method commonly applies to water and sewer, trash, gas, and electricity. Each tenant pays a proportional share of the total utility charges rather than for actual consumption.
Why Multifamily Property Owners Use RUBS
Many apartment buildings weren’t built with separate water lines for each unit. Installing traditional submeters can require plumbing modifications, which increases operational costs.
For multifamily owners and property managers, a RUBS program is often more cost-effective to implement from a billing process standpoint.
Property management companies can update leases, apply the RUBS formula, and begin issuing RUBS bills while staying compliant with local regulations.
When utility prices increase, this system helps owners recoup utility costs. It reallocates expenses, but it doesn’t reduce actual utility consumption.
How Does the RUBS Allocation Method Work?
RUBS divides total utility expenses using a preset formula instead of individual meters. The property receives one master bill, then calculates each unit’s portion based on an agreed allocation method.
Here are the most common RUBS calculations used in multifamily properties.
Basic RUBS Calculation Example (Occupancy Method)
This method bases charges on the number of residents in each unit.
Consider this simple example. A five-unit building has 10 total residents and a $1,000 monthly utility bill.
First, divide $1,000 by 10 residents. That equals $100 per person.
Each unit then pays according to occupancy.
A unit with two residents pays $200.
A unit with three residents pays $300.
This method assumes that more occupants result in higher utility consumption.
Square Footage Method
This approach assigns higher charges to larger units.
The assumption is simple. A larger unit size uses more utilities. For example, heating a 1,500-square-foot apartment often costs more than heating an 800-square-foot unit.
The limitation is clear. Size doesn’t always reflect actual usage. A smaller unit with multiple occupants may consume more water or energy than a larger unit with one resident.
Ratio Percentage Method (Assigned Percentage)
Some properties assign each unit a fixed percentage of the total utility bill.
For example:
If the total water bill is $1,800 and Unit 101 is assigned 4%, that unit pays $72.
If Unit 202 is assigned 5.75%, it pays $103.50.
Unless management adjusts the formula, those percentages remain consistent every month.
In practice, RUBS calculations vary based on lease terms and state regulations, but the concept remains the same.
The system estimates each unit’s share of the total bill rather than measuring actual consumption the way a submetering system does.
Key Considerations Before Adopting RUBS
Before you implement RUBS in your multifamily property, review how it will affect operations, residents, and overall utility management.
You don’t have to install individual meters in older, master-metered buildings, which can be extremely expensive.
You can charge tenants for shared utilities such as water, sewer, gas, or trash to help offset rising utility costs and higher interest rates.
Billing relies on RUBS calculations, not actual usage, which can raise questions about fair share and tenant satisfaction.
Existing tenants may resist changes if utilities were previously included in base rent. A new lease cycle often makes adoption smoother.
Clear communication and accurate unit information are necessary to prevent landlord-tenant disputes over RUBS bills.
In a master-metered property, you can’t shut off service to an individual unit for nonpayment.
RUBS can help recover utility costs. It doesn’t address hidden leaks, overuse, or broader utility management concerns.
Does RUBS Reduce Water or Energy Consumption?
In most multifamily properties, overall water and energy use remains largely unchanged after RUBS is implemented.
Residents pay a proportional share of the total bill, so their monthly charge isn’t based on their exact personal consumption. If someone shortens showers or reduces thermostat use, the financial difference is often minimal.
As a result, energy conservation isn’t strongly encouraged. The system focuses on fair allocation of shared utility costs, not on measuring or influencing behavior the way individually metered properties can.
Public reporting highlights another concern. According to The Urbanist, tenants at Qualman Apartments on Capitol Hill saw utility bills increase five to eight times higher than their previous baseline after switching to RUBS.
Residents who once paid a $50 flat fee were charged between $265 and $429 per month. Tenants stated they weren’t told the change would increase housing expenses by nearly 25%.
RUBS can redistribute expenses. It doesn’t, on its own, reduce total consumption.
RUBS vs Submetering: Which Is Better for Multifamily Properties?
The key difference between RUBS and submetering is simple. RUBS divides the total bill using a formula, while submetering measures what each unit actually uses.
With RUBS, you calculate charges using a residents-based formula or a fixed percentage. The amount a tenant pays reflects an allocation method, not the water or gas they actually used.
With submetering, each unit receives a bill based on its own consumption. Tenants see itemized statements that show exactly what they used.
When people know their water or gas bill reflects their habits, accountability increases.
Multi-tenant submetering also gives property teams clearer insight into building performance. A spike in one unit can point to a running toilet, a hidden leak, or unusual usage.
That level of detail helps you respond faster and manage utility expenses more effectively.
For multifamily owners, the choice affects more than billing. It influences tenant satisfaction, operational oversight, and how costs are distributed within the property.
Replace RUBS With DrizzleX Fixture-Level Submetering
If RUBS multifamily billing helps you recover costs but doesn’t show where water is actually used, fixture-level submetering answers that question.
Instead of dividing a master bill, you install meters at each fixture and track usage in detail.
How DrizzleX Submetering Works
DrizzleX installs micrometers on sinks, showers, toilets, bathtubs, washing machines, and common-area lines. Each micrometer tracks water flow right where it’s used.
The data is sent to a cloud gateway on the property and appears in a centralized dashboard. Property teams can review usage by unit, identify unusual patterns, and receive alerts when the system detects leaks or excessive flow.
That level of insight is especially valuable in commercial real estate, where utility performance affects operating income and property value.
Easy Installation Without Plumbing Work
A typical apartment requires seven micrometers. Installation takes about 15 minutes per unit.
There’s no need to cut pipes or open walls, which makes it possible to install meters in older buildings where traditional retrofits would disrupt residents.
Most properties require only one gateway to connect the entire building.
Stop Hidden Leaks Before They Inflate Your Bill
Each micrometer battery lasts up to 10 years and transmits data continuously. Owners can review portfolio performance, share usage information with current tenants, and bill residents based on actual consumption instead of estimates.
In Greenville, South Carolina, DrizzleX monitored 54 units with 108 tenants. Daily water use dropped from 20,427 gallons to 12,655 gallons within one year.
That’s a 38% reduction and an estimated $17,839 in annual savings. The system also uncovered dozens of running toilet leaks.
Unlike RUBS multifamily billing, fixture-level submetering reduces water waste and encourages water conservation. It can also make your property more attractive to prospective residents who value transparency and fair tenant billing.
FAQs About RUBS Multifamily
What are RUBS in multifamily properties?
RUBS in multifamily properties refer to a billing method where shared utility costs are divided among residents using a formula.
Instead of measuring each unit’s actual usage, the property allocates the total master bill based on factors like occupancy or square footage.
What does the term "RUBS" mean?
RUBS (ratio utility billing system) describes a method of allocating utility charges proportionally rather than measuring exact consumption. The structure and implementation can vary depending on local rules and lease agreements.
How do you calculate RUBS?
To calculate RUBS, the total utility bill is divided using a preset formula. This may be based on the number of residents in each unit, unit size, or a fixed percentage assigned to each apartment.
Property teams often rely on property management software to automate calculations and reduce administrative overhead.
What is the difference between RUBS and submetering?
RUBS allocates utility costs using an estimate. Submetering measures actual usage within each unit. With submetering, residents pay for the water or energy they consume, which encourages conservation and provides clearer accountability.
