Utilities are the line item most first-time arbitrage operators get wrong. Not because the numbers are hard, but because most landlords don't think about them the way you need to. A long-term tenant runs a dishwasher a few times a week and does laundry on weekends. A short-term rental runs the AC at 68°F for a family of five on vacation, cycles laundry between every guest, and never turns the lights off. If your lease says "tenant pays utilities" with no further detail, you've just inherited a variable cost with no ceiling — and the landlord has no incentive to care, because it's not their bill anymore.
This is a negotiation most operators skip because it feels like a minor clause next to rent, term length, and STR permission. It isn't minor. On a unit running near capacity, utility overages can quietly erode a chunk of your monthly margin, and unlike rent, you won't see it coming until the bill arrives.
Why Utilities Behave Differently Under Arbitrage
A residential lease is written around residential usage patterns. Landlords and their insurers price utilities (when they're included) or ignore them (when they're not) based on one household living normally. An arbitrage unit doesn't behave like one household — it behaves like a small hotel room with guest turnover every few days. Higher occupancy variance, higher HVAC load, more hot water draws, more washer/dryer cycles if you're providing linens on-site.
If the landlord is on a master utility account and billing you back a flat estimate, you're exposed if actual usage runs over. If you're on your own accounts, you're exposed to nothing structurally wrong — but you should still know your numbers before you commit to a rent figure that assumes low utility overhead.
Get Separate Metering Whenever You Can
The cleanest outcome is always separate, tenant-of-record utility accounts in your name: electric, gas, water/sewer where the building allows it. This does two things. First, it removes any ambiguity about who pays what — you get the actual bill, not the landlord's estimate. Second, it protects you from a landlord padding a "utility fee" line item because they assume STR guests use more.
Not every building supports individual metering, especially older multifamily properties on a single water or gas line. When that's the case, you're negotiating a cost allocation instead, and that's where caps and overage clauses matter.
Structuring a Utility Cap Clause
If the landlord is including utilities in rent or billing you a flat monthly amount, don't accept an open-ended "reasonable usage" clause — it's unenforceable in your favor and gives the landlord room to renegotiate later if they don't like your bill. Instead, push for language that specifies:
- A baseline monthly allowance in dollars or usage units (kWh, therms, gallons), based on either the unit's trailing 12-month history or a comparable unit in the building — ask for the history, don't guess.
- An overage rate that kicks in above the baseline, billed at the utility's actual per-unit rate, not a landlord markup.
- A billing cadence — monthly reconciliation, not an annual true-up that lets overages compound unnoticed for a year.
- A cap on total pass-through if you're nervous about a single bad month (a heat wave, a burst pipe) — a ceiling protects you from a one-time spike blowing up your P&L.
If the landlord won't share trailing usage history, that's a signal worth noting on its own — either they don't track it closely, or the number isn't flattering. Either way, build in a buffer on your underwriting rather than take their verbal estimate at face value.
Ask About Sub-Metering Before You Assume It's Not an Option
In multifamily buildings without individual meters, sub-metering — a device that measures your unit's actual draw off the master account — is more available than most first-time operators assume, especially in markets with active STR volume where landlords have seen the request before. It's a small hardware cost, often under a few hundred dollars per utility, and it converts an estimate-based dispute into a data-based one. If you're planning to hold the lease for a year or more, or you're negotiating a master lease across multiple units in the same building, raising sub-metering early is worth the conversation — it's cheaper for both sides than arguing over invoices every month.
Where the Highest-Volume Utility Risk Actually Hides
Three categories create the most overage risk, and they're the ones worth asking about specifically before you sign:
HVAC in extreme climates
Desert and gulf-coast markets in summer, or northern markets in deep winter, are where guest-driven HVAC usage diverges hardest from long-term-tenant patterns. If you're arbitraging in Phoenix or Miami, don't extrapolate from a mild-climate comp.
Water in units with hot tubs, pools, or high-turnover linens
Any amenity that drives repeat water and gas (for heating) usage — hot tubs especially — should get its own line in your underwriting, not get folded into a general "utilities" estimate.
Internet and streaming service overages
Less about dollars, more about the trap of assuming a residential-tier plan handles guest streaming across multiple devices without throttling or overage fees. Confirm the plan tier and account ownership before you list.
Put It in Writing, Not in the Conversation
Verbal assurances from a landlord — "don't worry about it, it'll be fine" — are not a clause. If utilities aren't separately metered and you're relying on a cap or allowance, that number needs to be in the lease or addendum, with the reconciliation and overage terms spelled out. A landlord who's genuinely comfortable with the arrangement won't resist putting it in writing; resistance there is itself useful information about how the rest of the relationship will go.
Utility terms are one more variable in a deal that already has rent, term length, STR permission, and exit clauses to negotiate — which is exactly why they're easy to underwrite loosely or skip entirely. Running the full picture, including realistic utility exposure by climate and unit type, is the kind of underwriting AirLoom's property verdicts are built to catch before you're the one absorbing the surprise.