I’ve talked to dozens of mobile home park investors who bought a park on a strong cap rate, ran their numbers confidently, and then watched their actual cash flow come in $2,000–$5,000 per month lighter than projected.

The culprit, almost every time? Utilities.

Specifically: master-metered utilities in a park where residents have zero skin in the game.

The Master Meter Trap

Here’s how it works. The park was built in 1972. The developer ran one water main, one sewer connection, paid one utility bill, and spread that cost across lot rents. “Utilities included” was the selling point. For decades, that worked because utility rates were low and stable.

Fast-forward to 2025. Water and sewer rates in the Southeast have increased 35–50% over the past five years in many markets. Trash costs are up. In a master-metered park, every rate increase hits the operator directly — not the tenant.

And because tenants don’t see a utility bill, there’s no conservation incentive. Why worry about a dripping faucet when it’s not your water bill?

The math compounds fast. A 50-lot park paying $6,000 per month in water and sewer — where individual lot costs should run $80–$100 per lot — means the operator is subsidizing $4,000–$5,000 every single month.

That’s $48,000–$60,000 per year you’re leaving on the table.

Your Three Options: RUBS vs. Submetering vs. Doing Nothing

Option 1: Do Nothing

This is the most common choice, usually by default rather than decision. You absorb the costs, accept compressed margins, and hope utility rates stabilize. They won’t. This is not a strategy.

Option 2: RUBS (Ratio Utility Billing System)

RUBS divides your master utility bill among tenants based on a formula — typically number of occupants, lot size, or a flat split. You bill each tenant their allocated share monthly as a separate line item on top of their lot rent.

Pros: No capital cost, can be implemented within 60–90 days, typically recovers 70–85% of utility expense.

Cons: Requires proper legal implementation (state-specific notice periods, lease addenda). Some states have restrictions on RUBS. Tenants may push back initially.

Option 3: Individual Submetering

Install individual water meters at each lot. Tenants pay based on actual usage, billed by the park as a utility reseller.

Pros: Most equitable model, drives real conservation (consumption typically drops 15–25% when tenants see their own bills), cleanest for long-term operations.

Cons: Capital cost of $400–$800 per lot for meters and installation. For a 60-lot park, you’re looking at $24,000–$48,000 upfront.

ROI on submetering: if you’re currently absorbing $4,000 per month in utility costs and submetering recovers $3,200 per month, you’re paying back a $30,000 installation in under 10 months.

How to Implement RUBS Without Getting Into Legal Trouble

This is where most operators get tripped up. You cannot just start billing tenants for utilities without following the correct process. Here’s the framework:

1. Check your state law. Some states have specific RUBS regulations. Others have no restrictions. Know your state before you do anything.
2. Review existing leases. Your current leases may say “utilities included.” You’ll need a lease addendum to add RUBS billing. This cannot be done unilaterally mid-lease — you need tenant consent or you wait for renewal.
3. Provide proper written notice. Most states require 30–60 days written notice of any change to lease terms. Send certified mail. Document everything.
4. Bill transparently. Show tenants exactly what the master utility bill was, how the allocation formula works, and what their individual share is. Tenants are far more accepting when the math is visible.
5. Start with new tenants immediately. Any new tenant on a new lease can be billed on RUBS from day one. Phase the transition as existing leases come up for renewal.

Real Numbers from the Field

Here’s a real scenario from a park we evaluated: a 45-lot community in Tennessee, master-metered on water and sewer. The seller was paying $4,800 per month in utilities. RUBS billing: $0.

After implementing RUBS:

• Average RUBS allocation: $72/lot/month
• 45 lots × $72 = $3,240/month recovered
• Net utility cost drops from $4,800 to $1,560/month
• Annual NOI improvement: ~$39,000
• At a 7% cap rate, that’s $557,000 in value creation

One operational change. No capital expenditure. Over half a million dollars in value.

That’s not theoretical. That’s the actual math on recovering costs you’re already incurring.

The Bottom Line

If you own a master-metered park and you’re absorbing 100% of utility costs, you have a fixable profit leak. RUBS implementation is not rocket science — it’s a legal process and a communication challenge, not a technical one.

The operators who treat utility billing as “too complicated to deal with” are permanently leaving 20–40% of their potential NOI on the table.

The ones who execute it correctly are the ones telling stories about creating half a million dollars in value without buying another park.

Figure out which category you want to be in.

Keel Team operates manufactured housing communities across NC, TN, GA, SC, and beyond. For a comprehensive look at how we evaluate parks before acquisition — including utility infrastructure analysis — check out our Mobile Home Park Due Diligence Playbook. Connect with us at keelteam.com.