Self-Storage Cap Rate Calculator & Underwriting Guide
Model climate-controlled and drive-up self-storage acquisitions using the universal Cap Rate formula and illustrative occupancy and expense assumptions.
Cap Rate Calculator
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NOI = Effective Gross Income (EGI) minus operating expenses (property tax, insurance, maintenance, management), before loan payments and income taxes.
Calculation Summary
How Self-Storage Cap Rate Underwriting Works
Self-storage facilities operate on month-to-month rental agreements with no tenant improvement (TI) allowances or leasing commissions upon unit turnover. Because rental rates can be adjusted monthly, storage income responds rapidly to local supply and demand. In educational underwriting models, institutional climate-controlled facilities are commonly modeled at illustrative cap rates of 5.50% to 6.25%, while secondary drive-up facilities are often modeled between 6.25% and 7.25%+. These figures are illustrative underwriting assumptions for analysis and education—not live market benchmarks.
Key Self-Storage Underwriting Metrics
A facility may be 90% physically occupied, but if tenants receive move-in discounts or are delinquent, economic occupancy (actual collected rent ÷ gross potential street rent) may be only 78%–82%.
Storage facilities have no interior kitchens or plumbing per unit, keeping routine maintenance low; major expenses are property taxes, digital marketing, software, and staffing.
Self-storage demand is hyper-local. New competing facilities within a 3-mile trade area can compress street rates and extend lease-up timelines.
Formula & Mathematical Definition
Cap Rate (%) = [ Net Operating Income (NOI) / Purchase Price ] × 100NOI (Net Operating Income): Gross operating revenue minus all operating expenses (property taxes, insurance, management, maintenance), before debt service and income taxes.
Purchase Price / Value: Total acquisition cost or current independent appraised market value.
Worked Self-Storage Underwriting Example (55,000 Net Rentable SF)
Consider an illustrative 450-unit hybrid drive-up and climate-controlled storage facility:
- Purchase Price: $4,200,000 ($76.36 per net rentable sq. ft.)
- Gross Potential Street Rent + Ancillary Late/Admin Fees: $495,000
- Physical Vacancy, Move-In Concessions & Bad Debt (16% combined economic loss): -$79,200 → Effective Gross Income (EGI): $415,800
- Annual Operating Expenses (Property Tax, Insurance, On-Site/Remote Mgmt, Paid Search): -$142,800 (34.3% of EGI)
- Net Operating Income (NOI): $273,000 → Unleveraged Cap Rate = $273,000 ÷ $4,200,000 = 6.50%
Underwriting Takeaway: The facility models at a 6.50% Going-In Cap Rate on in-place collections. Always verify whether seller revenue reflects discounted promotional move-in rates or stabilized existing Customer Rate Increases (ECRI).
Self-Storage Valuation Traps
Frequently Asked Questions (FAQs)
What is an illustrative cap rate range for self-storage facilities?
In educational underwriting models, self-storage cap rates are typically modeled between 5.50% and 7.25% depending on climate-control mix, facility age, and local supply within a 3-to-5 mile radius.
What is a typical operating expense ratio for self-storage?
Stabilized self-storage properties are commonly modeled with operating expense ratios between 28% and 38% of Effective Gross Income (EGI), though property tax reassessment after acquisition can increase this share.
Cap Rate Underwriting Reference Guide
Explore illustrative underwriting ranges, expense structures, and sensitivity frameworks across property types and market tiers.
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