Understanding NOI: The Number That Drives Self-Storage Valuation
Ask a buyer what they want to know about a self-storage facility before making an offer, and "What's the NOI?" will be near the top of their list. Net operating income isn't just a line on a spreadsheet—it's the fundamental measure of what your facility is worth to someone else.
Understanding NOI clearly gives you something valuable: the ability to evaluate your own property through a buyer's eyes, before they ever show up.
What NOI Actually Is
NOI stands for net operating income. It's a simple concept: take your facility's total revenue, subtract all operating expenses, and what you're left with is NOI.
NOI = Gross Revenue − Operating Expenses
What makes it powerful—and sometimes confusing—is what's included and excluded from that calculation.
What Gets Included in Revenue
When buyers look at your revenue, they're looking at everything your facility generates:
- Rental income from storage units (your core revenue)
- Administrative and late fees
- Insurance income (tenant protection program revenue)
- Truck rental income, if applicable
- Retail sales (locks, boxes, packing supplies)
- Auction proceeds, though these are typically normalized out
One important note: buyers will scrutinize economic occupancy (the percentage of potential revenue you're actually collecting) as much as physical occupancy. A facility running 95% physical occupancy but collecting below-market rents is worth less than one running the same occupancy at full market rates.
What Gets Included in Operating Expenses
Expenses that factor into NOI calculations include:
- Property taxes
- Insurance premiums
- Utilities (electricity, water, gas)
- Payroll and management fees
- Third-party management fees (if applicable)
- Marketing and advertising
- Repairs and maintenance
- Software and technology costs
- Administrative costs
What Gets Left Out
This is where owners sometimes get confused. The following are not included in NOI:
- Mortgage payments or debt service
- Depreciation
- Capital expenditures (major roof replacement, paving, etc.)
- Income taxes
The exclusion of debt service is intentional. NOI is designed to measure the property's income-generating ability independent of how it's financed. That makes it a clean, comparable metric across buyers with different capital structures.
Why Buyers Recast Your NOI
Here's something many owners discover during a sale: the buyer will often recast your NOI rather than simply accepting what you've reported.
Recasting means the buyer adjusts your numbers to reflect what they believe stabilized, normalized operations should look like. Common adjustments include:
Management fee normalization. If you self-manage and don't pay yourself a market-rate management fee, buyers will add one—typically 6–8% of revenue—because that's what they'd pay if they hired a third-party operator.
One-time expense removal. A major one-time repair in a given year might be excluded from the normalized view.
Below-market rent adjustment. If your rents are significantly below what the market supports, buyers may note the upside but won't always fully credit it in their offer.
Owner-paid personal expenses. If any personal expenses are running through the business, these get added back.
Understanding that buyers will recast your numbers means you shouldn't go into a sale surprised when the buyer's NOI figure differs from yours. The goal is to arrive at a representative picture of ongoing performance—not necessarily what you reported in any single year.
How NOI Connects to Value
Once a buyer has a normalized NOI figure, they apply a cap rate to arrive at a value. If you haven't read the post on cap rates, the short version is this: dividing NOI by the prevailing market cap rate gives you an implied value.
A facility generating $300,000 in stabilized NOI in a market where similar assets trade at 6.0% cap rates implies a value of roughly $5.0 million. That same NOI at a 5.5% cap rate implies $5.45 million. The difference—nearly half a million dollars—comes entirely from the cap rate, not the income itself.
This is why improving your NOI—whether through revenue growth, expense management, or occupancy gains—is one of the most direct ways to influence your facility's value.
Practical Takeaways for Owners
If you're thinking about selling, there are a few things worth doing now:
- Get your financials clean. Buyers want clear, well-organized P&Ls. Commingled expenses and unclear accounting slow deals down and raise questions.
- Understand what your management fee normalization looks like. If you self-manage, know what a buyer will add back for a third-party fee.
- Benchmark your rents. If you're below market, understand how much upside buyers will acknowledge (and how much they'll discount for uncertainty).
- Track ancillary revenue. Insurance income and administrative fees add up and deserve their place in your NOI story.
Advisors who specialize in storage transactions—including teams like those at Oasis Investment Sales—spend considerable time working through NOI analysis with owners before going to market. Getting this picture right before buyer conversations begin sets the right expectations and often leads to better outcomes.
For context on how buyers use NOI alongside other metrics, see How Comparable Sales Reveal What Your Facility Is Really Worth.
Have questions about how your facility's income is likely to be analyzed by a buyer? We'd love to help you think through it.
Email us: info@thestoragetrend.com
