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The bill adds electricity. You need to see which method. You tap the edge of your commercial lease draft, eyes landing on the utilities section half highlighted in yellow. You already heard horror stories from a fellow small business owner who paid 3x more for power than their actual usage last year, so you’re not rushing to sign anything until this is crystal clear.
What a flat add-on actually covers
A flat electricity add-on is a fixed monthly fee baked into your base rent, calculated using the building’s average historical power usage divided across all occupied suites. The fee doesn’t shift based on how much or how little power you use, even if you install energy-efficient LED lighting, turn off all equipment after hours, or run high-wattage machinery 12 hours a day. Most landlords tie this fee to an annual inflation adjustment, so it will rise 2-3% each year on average regardless of actual market energy costs. Some landlords also include shared building power costs for lobbies, elevators, and parking garage lighting in the flat add-on, while others bill those separately as part of common area maintenance fees, so you will want to confirm exactly what the flat rate covers before you agree to it.
How a submeter tracks your unique usage
A submeter is a separate power meter installed exclusively for your suite, connected directly to your local utility provider’s monitoring system. Every watt of power you use for lighting, equipment, climate control, and outlet usage is logged in real time, and you receive a separate bill each month for exactly the amount of power you consume, at the same utility rate the landlord pays for the building’s master meter. Some landlords charge a small monthly administrative fee to cover the cost of reading and maintaining the submeter, but that fee is usually capped at $15 to $25 per month. Submeter data is accessible to you on request at any time, so you can spot unusual usage spikes that signal malfunctioning equipment or wasteful energy habits you can adjust to cut costs.
Compare long-term cost differences for your space
Illustrative example: A 1,200 sq ft office suite in a mixed-use commercial building has an average flat add-on quote of $285 per month. The table below breaks down cost differences between the two models across three common usage scenarios for this size of space:
| Usage Scenario | Monthly Flat Add-On Cost | Monthly Submeter Cost | 12-Month Total Difference |
|---|---|---|---|
| Low (20% below building average, energy-efficient fixtures, 40 hour work week) | $285 | $198 | +$1,044 paid with flat add-on |
| Average (matches building average, standard fixtures, 50 hour work week) | $285 | $277 | +$96 paid with flat add-on |
| High (30% above building average, server room, 65 hour work week) | $285 | $362 | -$924 paid with flat add-on |
If you run a low-power operation like a marketing agency with mostly laptops and minimal heavy equipment, a submeter will almost always save you money over the length of your lease. If you run a business that requires consistent high power usage, like a print shop or small manufacturing space, a flat add-on may insulate you from unexpected spikes in utility rates or seasonal usage surges from climate control. The numbers above account for standard commercial utility rate fluctuations in most U.S. markets, but you can plug in local rates from your city’s dominant utility provider to get hyper-accurate figures for your specific location. If you plan to make energy-efficient upgrades to the space, like installing solar panels on your suite’s portion of the roof or switching to smart thermostats that cut climate control costs when the space is empty, a submeter lets you capture 100% of those savings, instead of sharing them with every other tenant in the building via a reduced building average that only lowers the flat add-on for everyone by a few dollars a month.
Key clauses to flag for negotiation
No matter which model you prefer, you’ll want to mark specific lines in your lease to avoid unplanned costs down the line. If you agree to a flat add-on, confirm there is language explicitly stating the fee cannot be increased mid-lease term outside of the pre-agreed annual inflation adjustment, and that you will not be charged extra for building-wide energy upgrades like new roof solar panels or shared lobby lighting. If you agree to a submeter, confirm the lease states you only pay for power measured by your suite’s submeter, and you are not responsible for any portion of the building’s master meter overages from shared spaces like hallways, elevators, or parking garage lighting. Add a clause that allows you to request a third-party submeter calibration once per year at no cost to you, if you suspect the meter is logging usage incorrectly. Make sure the lease specifies you will receive a full, itemized copy of the utility bill each month, not just a one-line charge on your rent statement. Lease Jacket’s built-in clause checker can flag missing protections for either utility model before you sign, if you want a second layer of verification.
Pause before you commit to either structure
This is the point where you set the lease down for the moment, instead of rushing to pick one option or sign off on the existing language. Pull your past utility bills, calculate your average monthly usage over the last full year of operation, and run the numbers against both the flat add-on quote and local commercial utility rates for your area. If you’re unsure how your power usage will change in the new space—if you’re expanding your team, adding new equipment, or shifting your operating hours—err on the side of asking for a 12-month trial period for the submeter, with the option to switch to a fixed flat add-on at the end of that period if your costs are higher than expected. You don’t have to make this call today, and most landlords are willing to adjust utility terms to lock in a reliable tenant for a multi-year lease.
Next time you pull up this lease page
You’ll come back to this section with your calculated monthly usage estimates, a short list of clause adjustments you want to request, and a clear sense of which model fits your business’s long-term budget. You can cross-check any proposed changes to the utility section against the cost comparison table above to make sure the adjusted terms still align with what you can afford. If you’ve negotiated a trial submeter period, make sure that language is added in writing directly to this utilities section, not just promised in a verbal conversation with your landlord or property manager. You’ll also want to confirm that any administrative fees associated with either model are explicitly listed in this section, with no hidden charges that can be added later without your written approval. Once you’re satisfied that the terms are transparent and aligned with your usage patterns, you can move forward to review the rest of the lease sections with confidence, knowing you won’t face unexpected power bills that eat into your operating margins down the line.