The US self storage market is large, unusually fragmented and intensely local. This article explains how big it is, who owns it, how the last decade of building reshaped it, and why national averages can mislead a first-time buyer.

Key takeaways

• The United States has roughly 50,000 or more self storage facilities holding on the order of 2 billion net rentable square feet, which works out to national supply of roughly 7 to 8 square feet per person depending on the counting method used.
• The four large publicly traded self storage REITs (Public Storage, Extra Space Storage, CubeSmart and National Storage Affiliates) own or manage only about one fifth to one quarter of US facilities, leaving the majority in the hands of small private owners.
• A development wave running from roughly 2016 through 2023 added heavy new supply to Sunbelt metros including Dallas-Fort Worth, Houston, Austin, Phoenix, Atlanta and much of Florida and the Carolinas, and those markets spent 2023 through 2025 absorbing it.
• Self storage performance is measured at the trade area level, typically a three to five mile radius, so national occupancy and rate averages are close to useless for underwriting a single facility.

How big the US self storage market actually is

Estimates of the US self storage inventory vary by source, but the commonly cited figures put the country at somewhere above 50,000 facilities containing roughly 2 billion net rentable square feet or more. Net rentable square feet, usually abbreviated NRSF, means the square footage inside the actual storage units that a tenant can rent, excluding hallways, offices, elevators, stairwells and loading areas. A facility’s gross building area is always larger than its NRSF, and the gap between the two is one of the first things an appraiser or lender checks.

Divided across the US population, that inventory produces a national supply figure of roughly 7 to 8 square feet per person. Different research houses arrive at different numbers because they draw the boundary of the industry differently. Some counts include only conventional self storage facilities, while others fold in portable storage, boat and recreational vehicle parking, and small industrial condominium projects that rent by the month. The Self Storage Association, Yardi Matrix and StorageCafe all publish inventory estimates, and a newcomer comparing them should expect variation of ten to twenty percent rather than treating any single number as definitive.

Scale matters mostly as context. Self storage is no longer a niche corner of commercial real estate, and it now competes with more established property types for institutional capital. But size at the national level tells a buyer almost nothing about a specific address, because storage demand is drawn from a very small geographic ring around each building.

Who owns US self storage, and why fragmentation matters

Four publicly traded real estate investment trusts dominate the industry’s public face: Public Storage, Extra Space Storage, CubeSmart and National Storage Affiliates. A real estate investment trust, or REIT, is a company that owns income-producing property and distributes most of its taxable income to shareholders. Together these four own or manage on the order of one fifth to one quarter of US facilities, a share that has grown steadily but still leaves them far short of control. Add the rest of the largest hundred operators, including private equity backed platforms and regional chains, and the top of the industry still accounts for well under half the national count.

The remainder, a clear majority of facilities, sits with small private owners. A large share of US self storage properties belong to someone who owns exactly one, often built or bought decades ago on land the owner already controlled. That fragmentation is the single most important structural fact about the industry for a first-time buyer. It means deals are available at a size an individual or small partnership can actually finance, it means seller sophistication varies enormously, and it means the quality of the records handed over in due diligence ranges from institutional-grade reporting to a shoebox of handwritten leases.

Fragmentation also creates the value-add thesis that draws most newcomers in. A single-facility owner who has not raised rents in three years, does not use dynamic pricing software, has no online rental capability and runs no paid search advertising is leaving revenue on the table that a more active operator can capture. The catch is that the same gap shows up in the seller’s financial records, and a buyer has to distinguish between genuine untapped upside and a rent roll that has been temporarily inflated with discounts before sale.

From mom-and-pop asset to institutional property type

Self storage began in the 1960s and 1970s as a low-cost use for cheap industrial land, typically single-story metal buildings on the edge of town with a resident manager and a padlock. For most of its first three decades lenders and appraisers treated it as a speculative business rather than real estate, which meant expensive debt and few buyers. That changed decisively after the 2008 financial crisis, when self storage income proved more durable through the downturn than most other commercial property types.

Institutional capital followed. Pension funds, insurance companies and private equity sponsors began allocating to storage, the REITs expanded through acquisition and third-party management, and standardized data sources emerged so a lender could benchmark a property against its competitors. The physical product changed too: multi-story climate-controlled buildings in dense urban and suburban submarkets replaced the drive-up metal rows as the default new build, carrying higher construction costs and higher rents. Understanding how those newer, more expensive buildings get priced is the subject of part 4 of this series on valuation.

The 2016 to 2023 development boom and the oversupply that followed

Strong returns and cheap debt produced a sustained construction wave that ran from roughly 2016 through 2023, pausing only briefly in 2020. Developers concentrated in fast-growing Sunbelt metros where land was available, entitlement was comparatively easy and population growth appeared to guarantee tenants. Dallas-Fort Worth, Houston, Austin, San Antonio, Phoenix, Atlanta, Nashville, Charlotte, Raleigh and most of the Florida corridor absorbed a disproportionate share of the new square footage.

The result in many of those metros was oversupply: more square feet delivered than the local population could absorb at the rents underwritten. Because storage tenants come from a tight radius, several new facilities opening within eighteen months of each other can hold an entire submarket below pro forma for years. Absorption has been uneven, and recovery timelines by market are covered in the article on Sunbelt self storage oversupply and recovery. New construction starts fell sharply from 2023 onward as construction costs, interest rates and softening rents made new projects harder to justify, which is the mechanism by which oversupplied markets eventually heal.

Where demand and population growth are concentrated

Storage demand tracks household movement more than any other single variable. People rent units when they move, downsize, combine households, divorce, inherit possessions, renovate, or run a small business out of a truck. Domestic migration into Texas, Florida, Arizona, Tennessee, Georgia and the Carolinas has been the industry’s demand engine for a decade, and those inbound flows are why developers targeted the same states.

The housing market complicates that story. Elevated mortgage rates from 2022 onward slowed existing home sales sharply, which removed a traditional source of new storage tenants. Demand proved more resilient than the housing data alone would predict, because a meaningful share of storage users are not moving house at all, a point explored in the article on storage demand during the housing market freeze. A buyer underwriting a Sunbelt facility in 2026 should treat population growth as necessary but not sufficient: growth fills units only if the local supply pipeline has stopped adding competitors faster than households arrive.

Texas as a self storage market

Texas is among the largest self storage states by facility count and square footage, anchored by four major metros. Dallas-Fort Worth and Houston are national top-tier storage markets by inventory, while Austin and San Antonio are smaller but were among the most heavily developed markets in the country relative to their size during the boom. Supply per capita across the major Texas metros generally runs above the national average, in many submarkets comfortably into double digits of square feet per person, a function of cheap land, permissive zoning in much of the state and few municipal barriers to storage development.

High supply per capita is not automatically a warning sign in Texas, because Texas households also consume more storage than the national average. Larger vehicle ownership, boats and recreational vehicles, small-business inventory and continuous in-migration all raise the baseline. It does mean, however, that Texas submarkets tolerate less error in underwriting: an operator who assumes 90 percent occupancy at market rate in an Austin submarket that added three facilities in two years is making an assumption the data will not support. As of 2026, the Texas metros are broadly in recovery, with new deliveries down sharply from their peak and occupancy slowly rebuilding.

The 2020 to 2026 cycle in brief

The pandemic produced an unusual surge. Households moved, remote work changed space needs, and occupancy and street rates climbed to levels the industry had never seen, peaking through 2021 and into 2022. Street rate, the advertised asking price for a vacant unit, is the industry’s most sensitive real-time indicator, and it rose faster than in-place rents for existing tenants.

From 2022 the cycle reversed. New supply arriving from the development pipeline collided with a frozen housing market and normalizing move-in volume, and street rates softened through 2023, 2024 and much of 2025, in some oversupplied Sunbelt submarkets falling well below their peak. Occupancy held up better than rates, because operators discounted to keep units full. By 2026 the picture improved: REIT reporting through the year showed move-in rates turning positive year over year for the first time since the downturn, a shift discussed in the summary of Q2 2026 REIT earnings themes. Recovery has been uneven, arriving first in supply-constrained coastal and Midwest markets and later in the heavily built Sunbelt.

Why national data does not underwrite a local deal

Nearly all published self storage statistics are national or metro-level averages, and a facility does not compete against a metro. It competes against the five to fifteen facilities inside its trade area, usually defined as a three to five mile radius in suburban settings and one to three miles in dense urban ones. Two facilities four miles apart in the same city can show occupancy 20 points apart and street rates 30 percent apart, and both numbers can be correct.

The practical consequence is that a national recovery headline is background information, not evidence about a particular deal. The relevant questions are local: how many competing square feet sit inside the trade area, what those competitors are actually charging today for the same unit sizes, how many households live in the ring, what has been permitted but not yet built, and whether the subject property’s own rates have been propped up with concessions. Those answers come from a physical rate shop of the competitors and a review of local permitting records, not from an industry report.

What this means for a newcomer

The national picture is worth understanding because it explains the environment a deal sits in: a large, still-fragmented industry that professionalized rapidly, overbuilt in the Sunbelt, spent three years digesting that supply and began recovering in 2026. It also explains why so many facilities are available to individual buyers, and why the seller across the table is more likely to be a retiring local owner than an institution.

What the national picture cannot do is price a building. A newcomer who arrives with confidence built on industry-wide occupancy averages and migration statistics will consistently overpay in exactly the markets those statistics look best in, because developers read the same statistics five years earlier and built accordingly. The states with the strongest population growth, Texas among them, are also the states with the most competing square footage per resident.

The useful posture is to treat national and state data as a filter and local data as the decision. Use the macro numbers to decide which metros are worth spending time in, then abandon them entirely at the trade area level and rely on what the competitors are charging this week, what the county has permitted, and what the subject property’s own rent roll shows once discounts are stripped out.

This is part 3 of the Storage 101 series. Previous: Self Storage Terminology Every Newcomer Should Know. Next: How Self Storage Facilities Are Valued. See the full series at Storage 101.