We bought a 105-unit self-storage facility in Madison, just outside Nashville, about a year and a half ago. It came with permanently built units, some truck parking, and a vacant lot on the side. The existing units? Maxed out. Full occupancy. And we've got customers lined up waiting for space. So the question became: how do we add more units without spending a fortune on new construction? The answer is shipping container storage.
I sat down with my business partner Jacob from Sixth Man Movers and Jamie from Storage Designer to walk through exactly how we're planning to add 46 shipping container storage units to our site, and the numbers are wild. We're looking at roughly $150,000 in total capital to create close to $800,000 in additional property value. That's a 5x return. And the beauty of it is you can do it in phases, a few containers at a time, so you never create excess vacancy.
If you're thinking about getting into commercial real estate investing through self storage investing (or you already own a facility and want to juice your returns), this is the playbook.
In This Article
Why Adding Units Beats Raising Rents Every Time
The Madison Property: What We're Working With
Designing the Layout: Three Options for Lot 1
New vs. Used Containers: Why Brand New Wins
Running the Numbers: How $150K Becomes $800K
Why Adding Units Beats Raising Rents Every Time
Self storage is one of the hottest asset classes in commercial real estate investing right now, and it has been for years. If you're looking at buying self-storage facilities, sure, you can raise rents and operate better to increase your net operating income. That's the standard playbook. But the real money? It comes from adding units to the site.
Think about it this way: even if you raise rents by 20% across the board at a stabilized facility, you're still not going to get anywhere close to a 5x return on your investment. But by spending the capital to add 40 or 50 modular units, you're creating 40% more income-producing square footage at a fraction of what it would cost to build from scratch. Your land basis drops, your NOI per unit goes up, and the property becomes substantially more valuable.
That's the value-add real estate investing strategy that gets me excited about self storage. And the best part? When you're buying, you want to look for sites that have additional land, maybe some industrial outdoor storage, maybe some truck parking, where you can eventually drop more units. The cost-to-revenue ratio is wildly outsized.
The Madison Property: What We're Working With
Our facility sits on just under two acres in Madison, which is an up-and-coming area right outside Nashville. We've got about 105 permanently built self-storage units that are already there, some truck parking, and a vacant lot on the side that we've already graded and gotten ready for shipping container storage units to be dropped in.
We also have a second lot inside the gate that's currently being used for RV and boat parking, maybe a dozen spots. It brings in decent money for not much effort, but we think we can do a lot better with it.
The approach here is modular. Instead of building an entire permanent structure (which would be expensive, slow, and require extensive permitting), we're bringing in shipping containers and prefabricated self-storage units and just dropping them in place. They're semi-permanent, they can be deployed in phases, and you're not committing all your capital at once.
"Don't build everything all at once. Add units as you need them. Especially with a modular approach like this, it's not really any more cost effective to do 100 units as it is five. Make sure you don't create too much vacancy."
- Tyler Cauble
And here's a self-storage hack that most people don't think about: partner with a moving company. My partner Jacob owns Sixth Man Movers, a moving company here in Nashville that's growing rapidly. His clients need storage constantly. So we've essentially maxed out our occupancy with our existing units, and Jacob already has customers lined up waiting for the new ones. That built-in demand is a game changer because you can let the demand dictate the supply instead of guessing.
Designing the Layout: Three Options for Shipping Container Storage
We brought in Jamie from Storage Designer to help us plan the layout. One of the biggest mistakes self-storage investors make is just dropping containers on a lot without any thought. You've got to think about access for moving trucks, turning radius, customer experience, fire code turnarounds, and how the site will look from the street.
Our lot is long and relatively thin, which created some design constraints. Jamie put together three options for us:
Option 1: The Simple Row. Twenty-four 20-foot containers all in a single row with a 25-foot access way. Very straightforward, great visibility across the entire site, and comfortable for multiple vehicles to pass each other and pull up to units with drive-up access. From a safety standpoint, I liked this one best because you can see everything going on. No nooks, no hiding spots. In a spot like Madison, that matters.
Option 2: The Maximized Layout. Twenty-eight 20-foot containers plus four smaller 10-foot units, configured in multiple rows. This gets us more units but reduces the access way to about 16 feet and creates 15-foot interior lanes. Still accessible for pickups and SUVs, but tighter for larger moving trucks. The smaller 10-foot units add variety in self storage unit sizes, which is nice for customers who just need a small space.
Option 3: The Hybrid Mix. This variation swapped some 20-footers for 40-foot containers targeted at commercial tenants. The 40-footers are hugely popular with small businesses and trades who need more space but aren't ready for a full warehouse lease. By pushing the 40-footers to the front of the lot (closest to the drive) and the smaller units toward the back, we get an efficient layout where moving trucks don't have to pull in too far.
One thing we discussed but decided against (at least for now) was tearing down an old switchboard building on the property. It's a windowless brick building that used to be a telephone switching station. Only three customers use it right now. Demolishing it could give us six or seven more container spots, but with about $20,000 in demo costs plus regrading, it becomes a numbers game. We'll revisit that decision later.
New vs. Used Shipping Containers: Why Brand New Wins
This was a big conversation. Shipping containers come in several categories: brand new (purpose-built for storage), one-trip (shipped once from the Far East and then sold), and used (could be 10+ years old, sold with a watertight and windtight guarantee). The price difference is real, but so is the risk.
Jamie's recommendation, and I agree with it completely, is to go brand new. Here's why:
Longevity. You're getting 15+ years of use out of a new container, and with proper maintenance (especially on the roofs in high-rainfall areas), even longer. Used containers are a gamble. You don't really know what you're getting until it shows up.
Appearance matters. Your customers are trusting you with their belongings. Walking into a site with a bunch of rusted, beat-up containers versus a site with clean, branded, color-matched units is a completely different experience. And that experience directly affects what you can charge.
Branding flexibility. New containers come in almost any color now. You can match them to your brand, add vinyl stickers, number the units, include instructional graphics for how to open and lock them. It all adds up to a more professional operation that commands higher rents.
The cost difference? A new 20-foot container runs about $2,500 to $3,500 delivered. Used might save you a few hundred bucks per unit, but the risk of getting something that looks terrible (or worse, leaks) is just not worth it. Think long term.
Running the Numbers: How $150K Becomes $800K in Value
This is where it gets fun. Let's break down the math on both lots.
Lot 1: The Side Lot
~11,000 SF graded · 20 containers · 20-foot units
$25K
Site Work
$50K
20 Units @ $2,500
$75K
Total Cost
$200/mo
Rent Per Unit
$31K/yr
Added NOI
$416K
Value Created @ 7.5% Cap
The site work cost us $25,000 for grading and gravel, which comes out to about $2.27 per square foot. Pretty inexpensive. New 20-foot containers at $2,500 each times 20 units is $50,000. So our all-in cost is roughly $75,000, or about $3,750 per unit.
At $200 a month per unit with about 35% operating expenses, that's $1,560 per unit per year in NOI. Multiply that by 20 and you get $31,200 in annual NOI. At a 7.5% cap rate, that's $416,000 in additional equity created. On a $75,000 investment. That's a 5.5x return.
Lot 2: The Parking Area
Currently boat/RV parking · 26 units · Mix of 40-foot and 20-foot
$25K
Site Work
$45.5K
26 Mixed Units
$70.5K
Total Cost
$140/mo
Rent Per Unit
$28.4K/yr
Added NOI
$378K
Value Created @ 7.5% Cap
The second lot is smaller and triangular, currently pulling in rent from about a dozen parking spots. We're planning a mix of five 40-foot containers (about $7,000 each with multi-door configurations) and some 20-foot units with divided roller shutter doors. The 40-footers with four separate doors let us rent out smaller individual sections, which is great for customers who just need a 10-foot space.
At $140 a month per unit (priced lower than the indoor units to stay competitive), we're looking at another $28,392 in annual NOI. At a 7.5% cap rate, that's $378,000 in value. On about $70,500 in cost. Another 5x return.
Combined Value Created
~$800K
46 units added · ~$145K total investment · Property purchased for $1.7M
Combined, we're adding roughly 46 units for about $145,000 in capital, and creating nearly $800,000 in additional property value. Keep in mind, we bought this property for $1.7 million. By spending another $145,000 (less than 10% of the purchase price), we're adding almost 50% more value to the property. That's how you analyze commercial real estate deals and find the upside that most people miss.
The Sticky Tenant Strategy That Fills Shipping Container Storage Units Fast
When you're thinking about who's going to rent these units, you've got two categories of customers. First, your typical residential mover who needs storage between apartments or just inherited mom and dad's stuff. They're fine, but they churn. Three to six months and they're gone.
Then you've got what Jamie calls "tradies" (much cooler word than "contractors," by the way). These are your HVAC companies, caterers, home stagers, small builders. They don't need a full warehouse, but they need somewhere to store their equipment and parts. And they are incredibly sticky tenants. They start with one container, then they need two, then three. It becomes a business expense. They're not leaving.
A lot of the sticky customers we acquired when we took over the property were exactly these types of businesses. There's an HVAC company, a caterer that stores event equipment, and several small contractors. They're willing to pay a premium for dedicated access, and their expectations are easier to manage because they're professionals.
Here's the gap in the market that we didn't fully appreciate until we got into this: as Nashville grows and property taxes keep climbing, small businesses are finding it harder to afford leasable space. They can't keep everything at their house (there are rules against that in most neighborhoods). So a shipping container storage unit at $200 a month becomes the perfect middle ground. It's cheaper than a warehouse, more accessible than indoor climate-controlled storage, and they can drive right up to it.
If you can fill your units with these commercial tenants instead of residential movers, your occupancy becomes far more stable and your churn rate drops significantly. That predictability is worth a lot when you're trying to grow your self storage investing portfolio.
"If you want a really great self-storage hack, go partner with a moving company. They have clients that need storage constantly. Let the demand dictate the supply."
- Tyler Cauble
Key Takeaways
Adding units beats raising rents. Even a 20% rent increase won't give you a 5x return. Adding shipping container storage units to vacant land can.
Buy facilities with extra land. When you're looking to buy your first commercial property in self storage, look for sites with truck parking, vacant lots, or underutilized space where you can drop containers later.
Go new on containers, not used. A new 20-foot container runs $2,500 to $3,500 delivered, gives you 15+ years of life, and looks professional. Used containers are a gamble on quality and appearance.
Phase your deployment. Add five containers at a time, lease up to 70-80% occupancy, then add more. Don't create excess vacancy by building everything at once.
Chase sticky tenants. Small businesses, HVAC companies, home stagers, and caterers are far stickier than residential movers. They expand over time and rarely leave.
Work with a designer before dropping containers. Layout, access, turning radius, fire code, and customer experience all matter. Don't just start placing containers without a plan.
This article is adapted from a conversation on the Tyler Cauble YouTube channel with Jacob from Sixth Man Movers and Jamie from Storage Designer.
Want Help Analyzing Your Next Self Storage Deal?
Join the CRE Accelerator Mastermind for step-by-step coaching on finding, underwriting, and adding value to commercial real estate investments.
Learn More at CRECentral.comAbout Tyler Cauble
Tyler Cauble is a commercial real estate broker, investor, and developer based in Nashville, Tennessee. As the founder of The Cauble Group, he has acquired over 2 million square feet of industrial, retail, and office properties. Tyler is the author of Open for Business: The Insider's Guide to Leasing Commercial Real Estate and the host of the Commercial Real Estate Investor podcast. Through his CRE Accelerator mastermind at CRECentral.com, he coaches investors at every stage of their commercial real estate journey.


