What Is RUBS Utility Billing?
· 6 min read
RUBS stands for Ratio Utility Billing System. It is the practice of taking one master utility bill for a building and dividing it among the units using a formula, rather than reading a separate meter for each unit. If your duplex has a single water meter and you split the bill three ways, you are already doing RUBS — you just weren't calling it that.
Why RUBS exists
Most small multifamily buildings were plumbed and wired before anyone expected tenants to pay their own utilities. A converted house, a 1960s fourplex, an older triplex: one water line in, one meter, one bill to the owner. Installing submeters means a plumber, permits, and often several thousand dollars per unit.
RUBS is the workaround. Instead of measuring each unit's actual usage, you estimate each unit's fair share using something you can count: people, square feet, or units. The landlord recovers the cost, and tenants have some reason to care about consumption.
The common allocation methods
| Method | How it divides | Best for |
|---|---|---|
| Equal per unit | Total ÷ number of units | Buildings where units are nearly identical |
| By occupants | Weighted by how many people live in each unit | Water, sewer, and trash |
| By square footage | Weighted by unit size | Heating, cooling, and gas |
| Custom percentages | Fixed shares you set once | Odd layouts, or shares written into a lease |
| Submetered + remainder | Metered units pay actual usage; the rest split what's left | Buildings where only some units have meters |
There is no single "correct" method. The right one is the one that matches how the utility is actually consumed and that you can explain to a tenant without a spreadsheet. Water tracks people. Heat tracks space. Trash tracks households.
RUBS versus submetering
Submetering measures real consumption, so it is more precise and creates a stronger conservation incentive. It is also expensive to install and, in some states, comes with its own licensing and certification rules.
RUBS costs nothing to set up and can start with your next bill. The trade-off is that it is an estimate. A frugal single tenant subsidises a wasteful couple down the hall. That is exactly why most states that permit RUBS also require you to disclose the method in the lease before the tenant signs.
The three rules that apply almost everywhere
Whatever your state, three constraints show up again and again:
- Disclose the method in the lease. The tenant must be able to see, before signing, how their share will be calculated.
- Never bill more than the actual bill. The sum of what every tenant pays cannot exceed what the utility charged you. Utility billing is cost recovery, not a profit centre.
- Exclude common areas. Hallway lighting, laundry rooms, and irrigation are the owner's cost, not the tenants'.
Admin fees are where landlords get caught
Other names for the same thing
If you are searching for guidance, the same practice goes by several names: utility billback, pass-through billing, utility cost recovery, conservation billing, and third-party billing (when a vendor does it for you). Property managers usually say RUBS; statutes usually say "allocated" billing.
Doing it without a billing company
Dedicated RUBS vendors are built for portfolios in the thousands of units and generally will not take a building under ten. That leaves most small landlords doing it by hand each month: download the bill, do the arithmetic, redact the account number, write the emails, and remember which periods have already been billed so nobody gets charged twice for the same month.
Stop doing this in a spreadsheet
SplitDue splits the bill, generates a PDF for each tenant, and records which periods you have already billed. 14-day free trial.
This article is general information, not legal advice. Utility billing rules vary by state and sometimes by city. Confirm your local requirements before billing tenants.