Utility Billing 101: RUBS vs. Submetering — Which Billing Method Is Right for Your Property?

If you manage multifamily properties with a master meter, you have two main options for billing utilities back to residents: RUBS (Ratio Utility Billing System) or submetering. This is one of the most consequential decisions in your billing operation — it affects your revenue, your compliance risk, your resident satisfaction, and your capital budget.

In Part 1 we introduced the main billing methods. In Part 2 we covered the regulatory forces reshaping the industry. Now let's get into the head-to-head comparison that every operator needs to understand.

How RUBS Works

RUBS divides a master-metered utility bill among residents using a formula. No individual meters are required — the total bill is split based on one or more allocation factors:

• Square footage — larger units pay more
• Occupancy — more residents in a unit pay more
• Bedroom count — proxy for unit size and expected usage
• Hybrid — combination of factors (e.g., 50% square footage + 50% occupancy)

Example: A property receives a $10,000 water bill. Using a square footage formula, a 1,000 sq ft unit in a property totaling 100,000 sq ft would be allocated $100 (1% of the bill).

How Submetering Works

Submetering installs individual meters on each unit to measure actual consumption. The property still receives a master meter bill, but each resident is billed based on what their meter recorded.

The process:

1. Submeters installed on each unit's water, gas, or electric lines
2. Meters are read monthly (manually, via AMR drive-by, or AMI automatic transmission)
3. Each unit's consumption is calculated
4. Residents are billed for their actual usage, typically at the utility's published rate

The key difference: RUBS estimates what each unit probably used. Submetering measures what each unit actually used.

The Head-to-Head Comparison

The Case for RUBS

RUBS isn't going anywhere — despite the regulatory pressure. Here's when it makes sense:

Low capital budget. If you can't afford $200-600 per unit to install submeters, RUBS lets you start recovering utility costs immediately with zero hardware investment.

Older buildings. Some older properties have plumbing configurations that make submetering physically difficult or prohibitively expensive — shared risers, inaccessible pipes, or outdated infrastructure.

Short hold period. If you're planning to sell the property within 1-2 years, the ROI on submeter installation may not pencil. RUBS gets you partial recovery in the interim.

Supplementary billing. Even submetered properties may use RUBS for utilities that aren't metered — like sewer (often calculated as a percentage of water) or trash.

RUBS Best Practices

If you use RUBS, protect yourself:

• Use a hybrid formula. Square footage alone ignores occupancy differences. A hybrid of square footage + occupancy is more defensible.
• Deduct common area costs. Never allocate 100% of the master bill to residents. Document your common area percentage and how you calculated it.
• Cap allocations. Consider capping individual unit allocations at a reasonable percentage of the total to prevent outlier bills.
• Disclose the methodology. Include your RUBS formula in the lease. Transparency protects you legally and reduces resident disputes.
• Track your formula against actual consumption. If you ever install submeters, compare the metered data to your RUBS allocations. The gaps will show you where your formula was over- or under-charging.

The Case for Submetering

Submetering is where the industry is heading — and the numbers explain why.

Conservation. The EPA's WaterSense program and multiple academic studies have found that submetering reduces water consumption by 15-40% compared to master metering. When residents pay for what they use, they use less. The same principle applies to electricity and gas.

Higher recovery rates. Submetered properties consistently achieve recovery rates of 85-95%+, compared to 70-85% for RUBS. The precision of actual measurement means fewer disputes, fewer write-offs, and tighter reconciliation between what you pay the utility company and what you collect from residents.

Regulatory favor. Regulators overwhelmingly prefer submetering because it's based on actual measurement rather than estimation. As states tighten utility billing rules, submetering positions you on the right side of compliance. North Dakota's SB 2385 already requires direct metering in mobile home parks — a trend that could expand to conventional multifamily.

Resident satisfaction. Residents who pay for their own consumption generally have fewer complaints than those under RUBS, where high-conservation residents feel penalized for their neighbors' waste.

Submetering ROI Example

For a 200-unit property at ~$400 per unit installation cost ($80,000 total), the payback period in this example is under 3 years — and the savings continue indefinitely.

RUBS, submetering, or both — VITALITY handles it all

Whether you're allocating by formula or reading individual meters, our platform automates billing, validates charges, and keeps you compliant. Starting at $0.50 per unit.

Talk to the Team

The Hybrid Approach

Many sophisticated operators don't choose one or the other — they use both.

Common hybrid setups:

• Submeter water, RUBS for sewer/trash. Water is the easiest utility to submeter and the highest-impact for conservation. Sewer is typically calculated as a percentage of water usage. Trash is often a flat allocation.
• Submeter electric, RUBS for gas. In properties with individual HVAC units, electric submetering captures the biggest variable cost. Gas (often used only for cooking) may not justify the metering investment.
• Submeter new construction, RUBS for legacy. Within a portfolio, newer buildings may be built with submeters while older properties stay on RUBS until a renovation creates an installation opportunity.

The Regulatory Factor

This is where the conversation gets urgent. As we covered in Part 2 and our Regulatory Shift series:

• Ohio is considering placing submetering companies under public utility commission oversight with rate caps (HB 173)
• Seattle is exploring a RUBS ban entirely
• Virginia now requires detailed calculation records for RUBS billing (SB 294)
• Maryland allows submetering but prohibits charges above actual utility cost (SB 130)

The regulatory trend is clear: measurement over estimation, transparency over opacity, actual costs over markups. That trajectory favors submetering.

Making the Decision

Here's a practical framework:

What's Next

Now that you understand the two main billing methods, it's time to talk about money. In Part 4: Hidden Revenue in Utility Billing, we'll show you where operators are leaving money on the table — and how to find it.

For the complete series, see Utility Billing 101: What Is Utility Billing?

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