How Much Do Storage Unit Owners Make?

How storage income is actually quoted

Self-storage is the one category in small-business acquisition that gets valued like real estate rather than like a business. Instead of SDE and a multiple, the number that matters is net operating income — gross rental revenue plus ancillary income, minus every operating expense including property management, but before mortgage payments, depreciation, and income tax. Price is then NOI divided by a capitalization rate, typically in the 6–9% range for single facilities outside major metros.

That distinction changes what “makes” means. A facility with $200,000 of NOI is not paying you $200,000. If you financed 75% of a $2.6M purchase, roughly $135,000–$160,000 a year goes to debt service, and your actual cash flow is the remainder. Two facilities with identical NOI can hand their owners very different incomes purely on how they were financed. The valuation mechanics are covered in detail in self-storage valuation.

Earnings by facility size and class

Unit count alone is a poor predictor. Size interacts with class — drive-up versus climate-controlled — and with whether the site is dense metro or rural highway. The bands below assume stabilized occupancy and third-party or owner management priced in.

• Small rural or small-town, 100–200 units, mostly drive-up. Gross of $60,000–$160,000 and NOI of $35,000–$100,000. Cheap to buy and genuinely low-labor, but rent growth is capped by local incomes and a single new competitor can flatten the market for years.
• Mid-size suburban, 300–500 units, mixed drive-up and climate. Gross of $180,000–$600,000 and NOI of $110,000–$400,000. The core of the owner-operator market. Enough scale to justify a part-time manager and real software, small enough to buy with an SBA 504 or conventional commercial loan.
• Metro climate-controlled, 400+ units. Gross of $500,000–$1.2M and NOI of $300,000–$800,000. Highest rent per square foot and the most defensible, but priced at institutional cap rates and increasingly bid on by REITs, which compresses the return.
• Facilities with meaningful ancillary revenue. Tenant insurance, locks and boxes, truck rental commissions, and late fees can add 8–15% on top of rental revenue at a well-run site. This is the single most reliable value-add lever on an under-managed facility.

The cost structure

Storage expenses are unusually predictable, which is why lenders like the category. As a share of gross revenue, a stabilized facility runs roughly:

• Property management: 5–7% if third-party, or an on-site wage. If the seller manages it personally and shows no management line, add it back out before you compute NOI. This is the most common single overstatement in the category.
• Property tax: 8–15%. And it will very likely reassess upward at your purchase price. Model the reassessed figure, not the seller’s current bill — on a facility bought well above its last assessed value this alone can move NOI by five figures.
• Insurance: 3–6%. Rising fast in coastal, hail, and wildfire-exposed markets. Get a real quote in your own name during diligence rather than assuming the seller’s premium transfers.
• Repairs, snow removal, and grounds: 4–8%. Doors, gate motors, and asphalt are the recurring items. Roll-up doors are consumables at scale.
• Marketing and online listing fees: 3–6%. Aggregator platforms take a cut of referred rentals. A facility that gets most move-ins through a third-party marketplace has a real ongoing cost that a facility with organic search visibility does not.
• Software, merchant fees, utilities, admin: 4–7%. Climate-controlled buildings push the utility share materially higher — often double a drive-up site.

Worked example: a 380-unit suburban facility

The facility has 380 units across about 42,000 rentable square feet, asking $1.12 per square foot at full rent. Full potential revenue is roughly $564,000. Physical occupancy is 91%, but after free-month promotions, three legacy tenants on decade-old rates, a manager’s comped unit, and 4% chronic delinquency, economic occupancy is 81% — so collected rental revenue is about $457,000. Tenant insurance and retail add $38,000, for $495,000 of gross.

Expenses: property tax reassessed at the purchase price $62,000, insurance $24,000, third-party management at 6% $29,700, repairs and grounds $31,000, marketing $22,000, utilities and software and merchant fees $30,000. Total $198,700, leaving about $296,000 of NOI — a 60% margin. At a 7.5% cap that supports roughly a $3.9M valuation. Finance 75% of it at current commercial rates over 25 years and debt service runs near $215,000, leaving the owner about $81,000 of pre-tax cash flow for what is genuinely a part-time role. Now note the lever: closing the 10-point gap between physical and economic occupancy is worth roughly $56,000 of NOI and about $750,000 of value, and requires no construction.

The earnings claims to discount

Storage diligence is largely a spreadsheet exercise, and the spreadsheet the seller hands you is the thing to distrust.

• Physical occupancy quoted as if it were economic. Demand the rent roll with per-unit contracted rate, move-in date, concession, and balance owed — then compute economic occupancy yourself. The gap between the two numbers is where most bad storage deals live.
• No property management expense. An owner-managed facility showing a 78% NOI margin is showing you unpaid labor. Restate at 5–7% before comparing it to anything.
• Current property tax used in the pro forma. In most jurisdictions the sale triggers reassessment. Pull the county’s methodology and model the post-sale bill.
• Pro forma rents that the market has never paid. Sellers routinely present “street rate” revenue as if every unit were at it. Ask what share of existing tenants are actually paying the quoted rate today.
• New supply not yet open. Check the municipality’s permit and planning records for storage projects within a few miles. A 600-unit facility breaking ground next year is the single biggest threat to your rent assumptions and it will not appear in any document the seller gives you.
• Deferred asphalt, roofs, and gate systems. These are large, lumpy, and easy to postpone right before a sale. Price the capital plan separately from the NOI.

Reconcile every revenue claim to three years of filed tax returns and to the management software’s own exported rent roll and delinquency report rather than a spreadsheet the seller typed. Our due diligence checklist sets out which documents to request in what order, how to verify business financials covers the reconciliation itself, and red flags when buying a business lists the patterns that should end a conversation.

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