30x120 Mini Storage Building

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30×120 Mini Storage

The mini-storage industry has seen consistent growth over the past 35 years, making it an enticing business opportunity for entrepreneurs and large operators. A 30×120 mini-storage building kit from General Steel can get your business off the ground in a matter of weeks with quick delivery and construction. Our versatile buildings allow for future expansion and include flexible divisions, so you’re able to modify the size of each unit according to rental needs.

All Mini Storage Buildings

Framing Detail, Warranties and Service

Brand General Steel
Available Products C-Channel Framing: 26 Gauge Sheeting
Add Colors Roof, Walls and Trim
Structural Warranty 50 Years
Paint Warranty 40 Years
Standing Seam Roof Warranty 25 Years
Galvalume Roof Warranty 20 Years
Project Coordinator Included at No Additional Cost

Self Storage Building System

Our mini storage buildings provide ultimate flexibility. Each building system features expandable interior walls which allows you to create rentable spaces that are tailored to your customer’s needs. You can also create your own color scheme to either blend into surrounding buildings and landscape or select something more bold to attract attention to your self storage business.


  • 26 gauge metal
  • Galvalume PBR roof, with a pre-painted option
  • 5x10 interior column spacing
  • Pre-painted exterior columns and header panels


  • No welding required
  • Options for gutters and downspouts, roof and wall insulation
  • No interior footings required
  • Engineered drawings for permit acquisition, erection and foundations

Frequently Asked Questions

What's the difference between C-Channel framing and I-Beam framing?

I-beams are used on larger structures that need to span greater widths. Since mini storage buildings only span the size of the storage unit, C-Channel framing is more than adequate. C-Channel framing provides an all steel building just like I-beam construction but C-Channel framing costs much less.

Can units be placed in the endwall of the building?

Yes, some of our customers opt to gain a few extra units by placing them in the endwalls. Doing so makes expanding from the endwall more difficult in the future.

Can General Steel supply two story public storage facilities?

Yes, while most of our customers elect for the more traditional low-rise mini storage system, two story projects are certainly possible. Keep in mind, a multistory self storage project requires a steel mezzanine which adds significantly more cost to the project.

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