Key Considerations for Self-Storage Conversion Projects

In the ever-growing self-storage industry, more developers and owners are turning to conversions as a cost-effective and time-efficient way to expand their portfolios. Repurposing existing buildings into storage facilities can yield significant benefits, however, it can also bring unique challenges. For a project to succeed, careful due diligence is critical. You must make sure that the site and building you’ve chosen can provide a genuine financial advantage.

Let’s look at the primary benefits afforded by self-storage conversions as well as the options available and key considerations, including ways to avoid costly mistakes.

Primary Benefits (With Caveats)

A self-storage conversion often comes at a lower cost than building a new facility from the ground up. By going this route, you can avoid the major expenses of raw-land acquisition, rezoning, site preparation and full construction. Instead, investments usually center on purchasing the building and making necessary renovations.

Of course, building size, location and condition matter. Transforming a building to a self-storage use typically involves installing unit partitions, upgrading systems and adapting circulation. These investments usually amount to less than the cost of ground-up construction. Still, if an office was originally designed for 50 to 80 pounds per square foot (PSF), reinforcing it to meet the 125 PSF requirement for self-storage can be expensive. Things like roof replacement, HVAC upgrades and modern elevators can also diminish financial gains.

In addition to potential cost advantages, conversions generally have shorter timelines than new construction. Because much of the structure already exists, a project can be completed in a fraction of the time of a new build. Weather delays are also minimized since most work happens indoors. That said, if there are unforeseen requirements like asbestos remediation, seismic upgrades or elevator-shaft rebuilds, progress can be slowed and schedules significantly lengthened.

Faster project timelines for conversions mean quicker occupancy and earlier cash-flow generation. However, rentable yield can be lower than anticipated. For instance, in a 100,000 to 120,000 square-foot office conversion, roughly 25% of gross space may be sacrificed to hallways, elevators and stairs. If this isn’t properly factored into a pro forma, the loss will significantly undermine projections for return on investment (ROI). New construction, while taking longer to complete, offers costs and layouts that are purpose-built, minimizing surprises. Cash flow is delayed but ultimately more predictable once operations begin.

Repurposing existing structures reduces waste and resource consumption, making a self-storage conversion the more environmentally responsible choice. Yet, sustainability doesn’t mean zero upgrades. Many older properties lack adequate insulation or modern roofing. Installing a 20-year, single-ply membrane or enhancing the thermal envelope may increase initial costs but deliver operational efficiency in the long term.

Finally, many self-storage conversion candidates already include utilities, parking and transportation access, which are advantages that can reduce upfront work when compared to ground-up builds. Still, careful consideration must be taken, as some elements may require relocation or modification. Examples include older electrical panels that repositioning to align with new corridors, or drive aisles and entrances that need redesign for proper access.

Choosing a Building

Building choice is critical in a self-storage conversion. The wrong structure could lead to lower ROI or failure to complete. Here are some options to consider:

Warehouses represent excellent opportunities due to their expansive space, high ceilings and robust infrastructure.
Retail spaces, particularly big-box stores or strip malls, offer advantages with their established parking facilities and customer-access points.
Industrial facilities provide solid foundations and structural strength suitable for multi-story projects.
Office buildings, while feasible for conversion, typically require heavier modifications, as floors may need significant reinforcement to meet storage-load requirements, and extensive circulation areas can substantially reduce rentable yield compared to other property types.

While these are prime conversion candidates, theoretically, any building with the desired characteristics can fit the bill. Here are some features to look for:

Ceiling height. A high ceiling is critical, especially if you plan to build multi-story. For a two-story building, look for a minimum height of 19 feet; for a three-story building, you need at least 30 feet. Additional clearance may be required if new HVAC ductwork is needed between floors.

Structural strength. Most office and commercial buildings were designed for 50 to 80 PSF, falling short of the 125 PSF typically required for self-storage facilities. Reinforcement through additional beams, bearing walls or joist upgrades may be required, which can significantly affect project budget and timeline.

Loading areas. These should allow at least 14 feet of vertical clearance to accommodate trucks and provide flush-grade access whenever possible. Undersized or poorly located elevators reduce usability, making investment in larger 4,500-pound-capacity cabs worthwhile for efficient operation and customer satisfaction.

Potential Challenges

Failing to account for the challenges that can arise during a self-storage conversion can add significant development costs, ultimately eroding your projected ROI.

Let’s start with zoning and permitting, which can represent come of the most significant challenges. When self-storage isn’t explicitly permitted in a location, you must pursue a variance or complete zoning change. In either case, the process can substantially delay project timelines and increase holding costs.

Any major structural modifications will require permits. Further, current building codes may mandate comprehensive upgrades to fire-suppression systems, HVAC equipment, electrical infrastructure and other components beyond what was initially anticipated. Environmental remediation for asbestos or lead can also add unforeseen costs. Consult with local professionals early in the process to identify which elements need modernization, and then build these realities into early ROI models.

Infrastructure can also present major hurdles:

Basic elevators typically need replacement with larger, higher-capacity freight models to accommodate storage needs.
Mechanical systems in older buildings are commonly outdated and inefficient. When upgrading, consider simple split HVAC systems or efficient rooftop units rather than maintaining central boiler systems that drive up operational costs.
Consider energy-efficiency improvements. Converting lighting to LED systems with motion sensors not only reduces long-term expenses, it enhances sustainability.
Address fire-safety requirements during initial planning, especially sprinkler systems, which are mandatory in self-storage facilities exceeding 100,000 square feet. Failure to do so can derail your budget later in development.

Conversion Best Practices

Evaluate properties thoroughly. Before purchasing a building for self-storage conversion, engage experts to assess its suitability. Architects, engineers and inspectors should be brought in to help identify potential issues with the structure, including all mechanical systems.

Collaborate with experts. Work with local professionals who understand building codes, permitting processes and zoning laws. Legal advisors can help streamline the approval process.

Engage with the community. Communicate with residents to gain support for your project. Address any concerns regarding traffic, safety or aesthetics to foster positive relationships.

Prepare for overruns. Always factor in unexpected costs, such as structural repairs, environmental remediation or unforeseen upgrades. It’s essential to have a contingency plan in place. Include the 20% to 25% rentable space loss in financial models.

Conversions represent a compelling growth strategy for self-storage developers and owners, offering potential savings, quicker timelines and sustainability advantages. However, they aren’t without risk. Structural deficits, outdated systems and regulatory hurdles can undermine cost-effectiveness.

By integrating technical due diligence, acknowledging possible loss of rentable square feet and preparing for contingencies, you can distinguish promising opportunities from ones that are unsafe. With the right preparation, a conversion can deliver excellent ROI and long-term value to any self-storage portfolio.

Andrew Thein is the marketing coordinator for MakoRabco, which specializes in self-storage and boat/RV-storage building design, installation and supply. Established in 1993, the company has offices in Carlsbad, California, and Winter Garden, Florida. To reach him, call 619.251.0430 or email [email protected].

About the Author

Andrew Thein

Marketing Coordinator, MakoRabco

Andrew Thein is the marketing coordinator for MakoRabco, which specializes in self-storage and boat/RV-storage building design, supply and installation. Established in 1993, the company operates from offices in Carlsbad, California, and Winter Garden, Florida. To reach him, call 619.251.0430 or email [email protected].

See more from Andrew Thein

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