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Storage Income Calculator
On-site storage adds high-margin ancillary income that flows straight to NOI. This calculator sizes monthly revenue from 5x5, 5x10, and 10x10 cages with occupancy and tenant insurance attach, then prices the contribution at your cap rate.
Lighting, security, billing
Monthly storage income
$1,656
Storage rent (after occupancy)
$1,556
Insurance attach margin
$101
Annual gross income
$19,878
Storage NOI
$15,678
Valuation at cap rate
$241,196
Annual revenue per unit
$904
How the math works
On-site storage is the second highest-margin ancillary income behind parking. Multifamily buildings convert hallway closets, basement rooms, and garage corners into rentable storage at $40-$200/month per unit. Occupancy reaches 80-95% in dense urban markets and 60-75% in suburban garden-style. Tenant insurance attach (a captive program) adds 10-15% to revenue with minimal operator effort.
Unlike parking, storage benefits from compounding: tenants accumulate stuff and rarely move out of storage even after they vacate the unit. Average storage tenancy is 18-26 months. CapEx to convert unused common space is typically $400-$900 per cage including lighting and security; payback is 6-18 months at typical rates.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Storage Income Calculator is built to give a quick, browser-based estimate for storage income. On-site storage adds high-margin ancillary income that flows straight to NOI. This calculator sizes monthly revenue from 5x5, 5x10, and 10x10 cages with occupancy and tenant insurance attach, then prices the contribution at your cap rate. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the storage income result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this storage income estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter unit count and rent for each storage size.
- Set realistic occupancy (most buildings run 80-90%).
- Enter tenant insurance attach rate and your monthly margin.
- Enter annual operating expenses (lighting, security, billing).
- Set the cap rate to value the NOI contribution.
- Read monthly, annual, NOI, and valuation lift.
Frequently Asked Questions
What's a typical storage rate?
Urban: $50-$80 (5x5), $90-$140 (5x10), $150-$240 (10x10). Suburban: $35-$55, $60-$95, $100-$160. Climate-controlled adds 25-50%. Always benchmark against the nearest Public Storage or Extra Space within 1-2 miles — they set the price ceiling for your captive tenants.
How do I find storage space inside the building?
Underutilized common areas: basement corridors, mechanical room overflow, garage corners, vacant ground-floor rooms. A 5-by-5 cage takes 25 sq ft; a typical garden-style multifamily has 200-1,000 sq ft of convertible space. CapEx for cages, lighting, and security is $400-$900 per unit.
Should tenants need insurance?
Yes — most modern leases require basic content insurance ($2,000-$5,000 limit) with a captive program. Operators earn $5-$12 monthly margin on each enrolled tenant. Insurance reduces operator liability for theft and water damage and creates an additional revenue line at near-zero variable cost.
Is storage income captured in the cap rate?
Yes — storage revenue and expenses are operating items and flow into NOI. A property that adds $30k of storage NOI lifts valuation by $30k ÷ cap rate. At a 6% cap, that's $500k of equity creation from a $20k-$30k cage build.
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