Straight answer first: a stabilized self-storage facility typically converts 58-68% of its revenue into net operating income, and what that means in dollars depends almost entirely on size and market. A small-town 150-unit facility might net $60,000-$100,000 a year; a large suburban facility can clear $500,000+. Anyone quoting one universal number is selling something.
What makes storage unusual — and why investors keep asking this question — is that the margin structure is the best in mainstream real estate. So let's build the income picture honestly: revenue per square foot, the expense stack, real examples by facility size, and what actually ends up in the owner's pocket after the loan payment. All figures are indicative U.S. ranges as of mid-2026.
The Income Formula (Three Numbers, That's It)
Facility income = rentable square feet × revenue per square foot × (1 − expense ratio).
- Revenue per square foot: most facilities collect $8-$15 per rentable sq ft per year — rural markets at the low end, strong metros and climate-controlled product at the top. This includes rent plus the ancillary income good operators layer on (tenant protection plans, fees, merchandise).
- Expense ratio: stabilized facilities run 32-42% of collected income — property taxes, management, insurance, marketing, utilities, maintenance. (Full breakdown in our deal analysis guide.)
- Rentable square feet: the size lever. A useful planning figure: single-story facilities fit roughly 15,000-20,000 rentable sq ft per acre after drives and setbacks — a mixed-size unit count of very roughly 120-180 units per acre depending on the mix.
What Facilities Make, by Size
| Facility | Rentable sq ft | Typical gross revenue | Typical NOI (58-68%) |
|---|---|---|---|
| Small rural (100-150 units) | 12,000-18,000 | $100,000-$200,000 | $60,000-$135,000 |
| Mid-size suburban (300 units) | 35,000-45,000 | $300,000-$600,000 | $175,000-$400,000 |
| Large metro / climate-controlled | 60,000-80,000+ | $600,000-$1.2M+ | $350,000-$800,000+ |
Real numbers move with occupancy and local rates — a saturated market drags the whole table down — but the shape holds: the margin is the constant; the size and market set the dollars.
NOI Isn't Take-Home: The Owner's Actual Paycheck
NOI pays the mortgage first. Take our calculator's default deal — a $2.5M facility producing about $158,000 NOI: with a typical 70% LTV loan at 6.5%, debt service runs ~$142,000, leaving ~$16,000 of levered cash flow. Buy the same facility outright and the full $158,000 is yours. Same building, wildly different "what the owner makes" — which is why headlines like "storage owners make $184,000 a year" are meaningless without knowing the debt.
The encouraging flip side: the gap between those two numbers is exactly what operational upside closes. Push an under-managed facility's income 20-30% (rate moves, protection plans, online rentals — the value-add playbook) and levered cash flow doesn't grow 20-30%; it multiplies, because the loan payment stays fixed. That leverage on improvement is the whole reason investors hunt mom-and-pop facilities.
Units, rents, occupancy, expenses, financing — see gross revenue, NOI, DSCR, and actual levered cash flow for any facility in about two minutes.
Frequently Asked Questions
How much do storage unit owners make a year?
After debt service, small-facility owner-operators commonly net $30,000-$100,000 annually, while owners of larger stabilized facilities can clear several hundred thousand — driven by facility size, market rates, occupancy, and how much was borrowed. Unlevered (no-debt) owners keep the full NOI: typically 58-68% of gross revenue.
How many storage units fit on an acre?
Single-story drive-up facilities typically yield 15,000-20,000 rentable square feet per acre once drive aisles, setbacks, and office space are carved out — roughly 120-180 units depending on the size mix. Multi-story climate-controlled buildings multiply that density at a much higher build cost.
How much does it cost to build a 100-unit storage facility?
A 100-unit single-story facility (roughly 10,000-13,000 rentable sq ft) typically runs $600,000-$1.2M all-in excluding land at 2026 costs — $60-$95 per square foot for standard drive-up construction. Full cost detail and the buy-vs-build decision framework: Buying vs. Building Self-Storage.
Is there such a thing as a self-storage franchise?
Not really — storage never developed a mainstream franchise model; the closest equivalents are third-party management, where Public Storage, Extra Space, or CubeSmart operate your facility under their brand for a fee, and passive storage syndications. If you see "storage franchise" pricing, read the fine print on what you're actually buying.
How profitable are storage units compared to other real estate?
Storage's 32-42% expense ratio is roughly half of what apartments run, with no tenant improvements or leasing commissions — the best operating-margin structure in mainstream real estate. The trade-off: commodity competition and supply risk, which is why location screening matters more than in tenant-relationship businesses. Full picture: Is Self-Storage Still a Good Investment?
How much money do I need to buy a storage facility?
With bank financing at 65-75% LTV plus closing costs and working capital, realistic entry runs roughly $150,000-$700,000 in cash for a first facility, and SBA loans can cut that meaningfully for owner-operators. Financing paths, DSCR sizing, and lender requirements: Self-Storage Financing Guide.
Income, cost, and margin figures are indicative U.S. ranges as of mid-2026 and vary by market, facility, and operator. Educational content, not investment advice.