Due Diligence Beyond the Numbers: What your self-storage proforma isn’t telling you that often lead to losing Hundreds of Thousands of Dollars
- 3 days ago
- 5 min read
A self-storage deal can look great on paper and still turn into an expensive mistake.
Strong demographics, healthy rent projections, and a clean-looking pro forma do not protect an owner from delays, redesigns, entitlement issues, contractor mistakes, or a slow lease-up if the wrong people are driving the process.
That is the part of due diligence too many investors miss. Financial due diligence matters, market due diligence matters, and physical due diligence matters, but team due diligence is just as important. In self-storage, execution risk is not a side issue. It is often the difference between a project that performs and one that quietly burns cash before the doors even open.
The Spreadsheet Is Only the Beginning
Most investors start where they should: the numbers. They review rents, absorption, supply, expenses, taxes, site costs, and projected returns. Those inputs are essential, but they also create a dangerous illusion. They make a deal feel more certain than it really is.
The reason is simple. A pro forma assumes the project gets built on time, on budget, and with the unit mix and density originally planned. It assumes the entitlement process goes smoothly, consultants do their jobs well, the contractor executes properly, and operations begin with a real plan for marketing, pricing, and lease-up. If any of those assumptions break, the original numbers stop meaning much.
That is why smart self-storage due diligence has to go beyond the spreadsheet. The real question is not only whether the deal works in theory. The real question is whether the team can execute in reality.
Where Deals Really Go Sideways
In self-storage development and conversion projects, losses often come from preventable execution mistakes rather than from dramatic market collapse. These are not rare black swan events. They are common outcomes when owners rely on inexperienced consultants, hire the wrong contractor, or try to manage a complex project without a strong lead on their side.
Project delays can erase a major chunk of expected revenue while interest, carry, taxes, insurance, and overhead continue to pile up. A missed entitlement nuance can reduce density, trigger redesigns, or stall a project entirely. Poor contractor selection can turn into cost overruns, change orders, and months of frustration that never appeared in the original underwriting.
Even after construction, weak execution can continue to hurt returns. A facility that opens without a disciplined lease-up strategy, revenue management process, and digital marketing plan may take far longer to stabilize than projected. Lost time at that stage is not just inconvenient. It directly affects cash flow, debt coverage, investor confidence, and long-term valuation.
What “More Than the Numbers” Really Means
When discussing self-storage due diligence, most people think about inspecting roofs, checking surveys, reviewing financial statements, and confirming market demand. All of that matters. But there is another layer that deserves equal attention: the people responsible for turning the business plan into an operating asset.
That means asking better questions early in the process. Who is coordinating the project from entitlement through delivery? How many storage facilities has the architect actually designed? Does the civil engineer understand traffic flow, drainage, and storage-specific site planning? Does the contractor have experience delivering storage products, not just general commercial buildings?
It also means looking at the operating side before the ribbon-cutting. Who is responsible for pricing strategy, online visibility, local lead generation, call handling, and move-in conversion once the project opens? A good site in a good market can still underperform if the operating team is weak.
Why the Right Team Protects Profit
The right team does far more than keep a project moving. It protects margin, timeline, and value at every stage. An experienced owner’s representative or project lead helps coordinate consultants, manage budgets, track schedules, catch problems early, and keep decisions aligned with the owner’s financial goals.
That role matters because every consultant and contractor on a project is focused on their own scope. Someone has to be focused on the full picture: rentable square footage, constructability, entitlement timing, cost control, and how each decision affects the final return. Without that leadership, issues can go unnoticed until they become expensive.
Specialized self-storage experience also matters more than many owners realize. Storage is not just another real estate product. Decisions around unit mix, climate control, access, visibility, security, circulation, and expansion potential all affect both development cost and revenue performance. A team that understands those details can help avoid mistakes that look minor during design but become costly in the field or after opening.
How to Underwrite the Real Deal
A better underwriting process includes both financial assumptions and execution assumptions. In practical terms, that means stress-testing a project for delays, cost overruns, slower lease-up, and design changes instead of relying only on the best-looking model.
It also means evaluating the team with the same seriousness used to evaluate the site. Owners should review whether the project has experienced guidance on entitlements, storage-specific design input, contractor selection, and operational launch. If those pieces are weak, the risk profile of the deal is higher no matter how attractive the projected yield may look.
This is where many investors make the costly mistake of trying to save a small fee upfront while exposing themselves to a much larger loss later. Paying for the right guidance at the beginning is often far cheaper than paying for delays, redesigns, legal issues, or underperformance after the fact.
Final Thought
If a self-storage investor is underwriting a deal without factoring in execution risk, team quality, and operational readiness, that investor is not underwriting the real deal. The numbers still matter, but they are only as reliable as the people responsible for delivering them.
In self-storage, due diligence is more than what is in the spreadsheet. It is the market, the site, the costs, the assumptions, and the team behind the project. When the right team is in place, risk can be managed and value can be protected. When the wrong team is in place, losses add up fast.
For owners, developers, and investors evaluating their next self-storage opportunity, the smartest question is not just, “Do the numbers work?” The smarter question is, “Do the right people have this deal under control?”
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As CEO of Storage Authority Franchising, Marc Goodin shares his passion, expertise, and unconventional wisdom with busy professionals to help them develop their own self-storage while they continue their careers. He owns 3 self-storage facilities that he designed, built, and manages. He can be reached at marc@StorageAuthority.com or directly at 860-830-6764 to answer your franchising, development, marketing, sales, and operations questions. His best-selling self-storage books are available at Amazon.
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