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How self-storage facilities are actually valued

July 30, 2026 · 5 min read

Almost every valuation reduces to two numbers, and most owners are told the wrong version of both. Here is what a buyer is actually calculating, and where the arguments happen.

If you own a self-storage facility and you have ever asked what it is worth, you have probably been given a number with very little explanation attached. That is not usually evasion. It is that the arithmetic is simple and the assumptions inside it are where all the money is.

Every valuation is two numbers

Commercial real estate is priced on income, not on what you paid or what it would cost to rebuild. For self-storage, the calculation is:

Value = Net Operating Income ÷ Capitalisation rate

Net operating income is annual revenue minus annual operating expenses, before debt service and before income tax. The capitalisation rate — the cap rate — is the yield a buyer requires. Divide by a smaller cap rate and the value goes up.

A facility producing $300,000 of NOI, priced at a 6.5% cap rate, is worth about $4.6 million. At 7.5% it is worth about $4.0 million. That one percentage point moved $600,000, and nothing about the building changed.

So there are only two arguments in any negotiation: what is the real NOI, and what is the right cap rate. Almost everything else is a proxy for one of those.

Physical occupancy is the wrong number

This is the single biggest gap between how owners describe facilities and how buyers price them.

Physical occupancy is the share of your units, or square feet, with something in them. Economic occupancy is your actual collected revenue as a share of what the facility would produce if every unit paid the current street rate.

They can be very far apart. A facility can be 95% physically occupied and 74% economically occupied, because:

• Long-tenured customers are paying rates set years ago that were never increased
• A share of units are on move-in promotions — a dollar for the first month, or half price for three
• Some occupied units are delinquent and will not pay at all
• Units are occupied by the owner, staff, or stored equipment and generate nothing

A buyer prices the collected revenue. When you hear that a facility is nearly full and the offer still looks low, the gap between those two occupancy figures is usually the reason.

The useful consequence: the gap is upside, and it should be paid for. A facility that is full at rates five years old has value that has not been taken yet, and that is a stronger position than being full at market rates with nothing left to give.

Which expenses get normalised, and why

Buyers rarely use your expense figures as submitted. They rebuild the expense stack to what it will cost them to operate. The common adjustments:

Line	What a buyer does
Management	Adds a market management fee — typically a percentage of revenue — even if you manage it yourself for free. Your labour is not free to them.
Property tax	Re-underwrites to the likely post-sale assessment, not your current bill. In some states a sale resets the assessed value outright.
Insurance	Uses a current quote, not your existing premium, if your policy has not renewed recently.
Repairs	Separates genuine one-off capital items from recurring maintenance, and adds a reserve if none is shown.
Owner costs	Removes personal vehicles, phones, travel and anything else that will not transfer.

Two of those deserve particular attention because they are where deals reprice late.

Property tax reassessment. In several states, a change of ownership triggers a fresh assessment at market value. If your facility has been held for years, its assessed value may be far below what it will sell for, and the tax bill will jump after closing. A buyer who models your historical tax figure and discovers this during diligence will come back and renegotiate. One who models the reassessed figure up front will quote lower initially and then hold.

Insurance. In hurricane-exposed and hail-exposed states, premiums have risen enough to move NOI by a meaningful margin on their own. Roof age and construction type now affect what premium is obtainable, which means they affect your sale price.

What actually moves your cap rate

Cap rate is a judgement about risk and growth. The things that compress it in your favour:

• No credible new supply nearby. If nobody can realistically build within your competitive ring, your income is more defensible. This is worth real money and is routinely under-credited.
• Rate upside. Existing rates well below street rate, with a track record showing customers absorb increases.
• Clean, current records. A rent roll a buyer can verify quickly reduces perceived risk. Genuinely.
• Size and quality. Larger, newer, climate-controlled facilities in stronger markets attract more competing buyers.

And what widens it: a facility still in lease-up, heavy concession dependence, deferred maintenance, a single-road submarket with new competitors coming, or records that cannot be substantiated.

Four mistakes that cost owners the most

Using a revenue multiple. “Facilities sell for X times gross” ignores your expense structure entirely. Two facilities with identical revenue and different tax and insurance loads are not worth the same.

Quoting physical occupancy as the headline. It invites a buyer to discover economic occupancy themselves, which reframes the conversation as a correction rather than as upside you are selling.

Not knowing your street rates versus your in-place rates. That spread is often the largest single component of what the facility is worth. If you cannot state it, you cannot be paid for it.

Cleaning up the rent roll before selling. Running an auction cycle to clear delinquencies changes the reported numbers without changing the underlying business, and any competent buyer underwrites through it. Sell the facility as it operates.

What to have ready

Whoever you sell to, these are what get asked for, and having them shortens everything:

• Three years of profit and loss, plus year-to-date
• A current rent roll showing unit type, in-place rate, move-in date, and delinquency status
• Your current published street rates by unit size
• The last two property tax bills and your current insurance declaration page
• A unit mix summary — sizes, counts, climate-controlled versus not

If your records are thinner than that, it is still worth having the conversation. It does mean a buyer will price the uncertainty, which is one more reason to know your own numbers before anyone else quotes them back to you.