The Feasibility Study: The $7,000 Question Before the $5 Million One
Your model can tell you whether a deal pencils. It can't tell you whether the market is real. That's what a feasibility study is for — and it's the cheapest insurance you'll ever buy on a development.
Every number in your pro forma rests on assumptions about a market you don't control: how many square feet of storage already exist within three miles, what they're charging this month, how fast a brand-new building will actually fill, and whether the demand is even there. You can guess all of that. A feasibility study is what you do instead of guessing — and at $5,000 to $10,000, it's a rounding error against a project that costs millions and runs for years.
It's also the document your lender will require before they fund a dollar of construction. So the only real questions are what's in one, how to read it without being fooled, and when to order it. Let's take them in order.
Underwriting answers "does this deal pencil?" A feasibility study answers "is this market real?" You need both — and the study has to come first, because it supplies the numbers the underwriting runs on.
What a feasibility study actually contains
A real feasibility study (sometimes split into a lighter "demand study" and a fuller "feasibility study") is a third-party analyst's verdict on your specific site and trade area. The good ones run 40–80 pages and include:
- Trade-area & demographics. Population, growth, household size, income, and renter share inside the relevant radius — usually a 3-mile and 5-mile trade area around your site, because storage demand is intensely local.
- Supply analysis. Every existing and planned competitor mapped, with their square footage — this is the single most important section, and we'll come back to it.
- Rate survey. A live matrix of what competitors charge by unit size, climate vs. drive-up — the raw material for your unit-mix revenue.
- Demand calculation. Estimated square feet of storage the trade area can absorb, against the square feet already there — the gap (or surplus) is the whole point.
- Recommended unit mix & rates for your building, tuned to that demand.
- Absorption forecast. A month-by-month lease-up curve projected for your site specifically — not a national rule of thumb.
- Financial projections. Typically several years of income statements, estimated development cost, and return commentary — a starting pro forma you then pressure-test in your own model.
The one section that decides everything: the supply test
If you read only one page of a feasibility study, read the supply analysis — because self-storage failures are overwhelmingly oversupply failures, not demand failures. People always need storage; the question is whether your trade area already has too much of it.
The metric analysts use is net rentable square feet per capita: total existing storage square footage in the trade area, divided by population. As a rough national benchmark the figure sits in the mid-single digits per person, and a trade area pushing well above that — especially with more supply already under construction — is a market where a new entrant lease-up will stall and street rates will be soft no matter how good your building is. This is exactly the dynamic the national data has been flashing: under-construction inventory recently sat near 3% of existing stock while street rates softened across a majority of top metros. A feasibility study is how you find out whether your trade area is one of the soft ones before you commit.
Storage rarely dies of weak demand. It dies of too much supply chasing it. The supply page is where a feasibility study earns its fee.
The study and your model are complements, not substitutes
This is the part developers get backwards. A feasibility study is not a replacement for underwriting, and underwriting is not a replacement for a feasibility study. They do different jobs:
| The feasibility study gives you | Your model turns it into |
|---|---|
| Trade-area demand & supply | An occupancy ceiling you can trust |
| Competitor rate survey | Your unit-mix blended rate |
| Site-specific absorption curve | The lease-up that drives your IRR |
| Estimated development cost | Your denominator — yield on cost |
The study supplies the truth about the market; your model supplies the verdict on the deal. Feed a credible feasibility study into a real underwriting model and you get a defensible yield on cost and development spread. Feed an analyst's rosy absorption forecast into a model that just echoes it, and you've laundered a guess into a spreadsheet. Your job is to take the study's market facts and stress-test them — slower lease-up, softer rates, higher costs — and see if the deal still holds.
When to order it — and the contingency that protects you
Timing matters more than people think. Order the study after your back-of-envelope spread test says the deal is plausible — no sense spending $7,000 to study a site that fails the five-minute math — but before you're unconditionally committed to the land. The professional move is to put the property under contract with a feasibility (or due-diligence) contingency: a window during which you can walk and recover your deposit if the study comes back ugly. That contingency turns the study from a sunk cost into a real option. The study says "walk," you walk, and the deposit comes home.
How to read one critically
Not all feasibility studies are equal, and some are ordered to bless a decision already made. Read every one with these questions:
- Who paid, and do they get the deal if it's a "go"? A study from a firm that also wants to manage or build your facility has a thumb on the scale. Independence matters.
- Is the planned supply counted? Existing competitors are easy; the projects in the entitlement pipeline are what sink a lease-up. A study that ignores what's coming is dangerous.
- Is the absorption forecast specific to this site, or a national default? "1,200 feet a month" pasted in from a template isn't a forecast. It should reflect your trade area's depth.
- Does the rate survey reflect street rates or sign rates? Headline asking rates overstate reality; real collected rates after concessions are lower. Make sure you're underwriting the rate people actually pay.
Pressure-test the study's numbers
Drop the feasibility study's rents, costs, and absorption into the model and see whether the deal still clears its spread when you make the assumptions tougher. Start with a fast read on the free calculator.
Open the free calculator → Get the full modelWhere to go from here
A feasibility study is the front end of diligence; your development pro forma is the engine that turns its market facts into a return, and the spread between your yield on cost and the exit cap is the verdict. Order the study early, read its supply page hardest, and never let an analyst's optimism substitute for your own stress test.
On why the study still matters even in a hot asset class, see Inside Self Storage on why you need one before developing. This article is educational, not investment advice — engage a qualified independent analyst for your specific site.