A self storage developer can line up the land, the financing, and the contractor and still get stuck waiting on one thing: the structural drawings. On a multi-story self storage building, the structural engineer decides how the building stands up, carries its loads, and gets through permitting. This guide from Metal Engineers LLC, a structural engineering firm for steel buildings and multi-story self storage, explains what a self storage structural engineer actually does, when each piece happens, and what to have ready before the first call.
What a Self Storage Structural Engineer Does
The structural engineer's job is to design the frame that holds the building up and to document it so a building department can approve it and a contractor can build it. On a self storage project, that work usually covers:
Loads. Working out what the building has to carry: its own weight, stored goods, people and carts on every floor, roof loads, wind, and in some regions seismic forces.
The framing system. Choosing and sizing the beams, columns, and floor system that carry those loads down to the ground.
The lateral system. Designing the bracing, frames, or walls that keep the building stable against wind and other sideways forces.
Foundations. Sizing footings and slabs using the soil information from the site's geotechnical report.
Structural drawings and calculations. Producing the stamped drawings and the structural calculations that back them up, which the building department reviews before issuing a permit.
Plan review responses. Answering questions from the building department's reviewers so the permit can move forward.
Why Multi-Story Self Storage Needs More Structural Design
Single-story self storage is close to a standard building type. Multi-story self storage design is not. Once the building goes vertical, the structure has to handle items a single-story site never sees:
Elevated floors carrying stored goods. Every upper floor is a structural system of its own, designed for stored contents plus carts and foot traffic in the corridors.
Elevators and stairs. Openings for elevator shafts and stairs interrupt the floor framing and need their own support.
Greater wind load. A taller building catches more wind, so the lateral system does more work.
Heavier foundations. Each added story adds load at the base, which shows up in footing size.
Coordination with the unit layout. The column grid has to work with the hallways, unit sizes, and door locations on every floor, not just one.
These items are also where most of the structural budget sits. The Metal Engineers LLC guide to the cost to build multi-story self storage walks through how each one affects the numbers.
Steel Framing vs Pre-Engineered Metal Building Systems
Most self storage construction uses one of two steel approaches. Conventional structural steel uses beams and columns designed for the specific building. Pre-engineered metal building systems come from a manufacturer as a designed package of frames, girts, and panels.
Each has a place. Pre-engineered systems are common on single-story self storage. Multi-story buildings bring elevated floors, elevators, and heavier loads, which often call for conventional structural steel or a combination of the two. The structural engineer's job is to match the system to the building's height, spans, and loads, and to coordinate with the manufacturer or fabricator so the pieces fit together.
When the Structural Engineer Gets Involved
A multi-story self storage project moves through a few stages, and the structural engineer has a role in each:
Concept and site planning. Early input on number of stories, column grid, and framing system. This is where the biggest cost decisions are made.
Design development. The structure is laid out alongside the architect's unit plan, and the framing and lateral systems are settled.
Construction documents. The final structural drawings and calculations are completed and stamped.
Permitting. The building department reviews the structural package, and the engineer responds to any comments.
Construction. Questions from the contractor and fabricator come back to the engineer as the building goes up.
The earlier the engineer joins, the more room there is to shape the structure around the budget instead of the other way around.
What to Have Ready Before Calling a Structural Engineer
A first conversation goes faster with a few basics in hand:
The project's location, including the state, since the engineer must be licensed there
The number of stories and the approximate building footprint
The architect's layout or unit mix, even in early form
The geotechnical report, if one has been done
Whether a pre-engineered metal building supplier or steel fabricator has already been chosen
Not having all of these is fine. Knowing which ones are still open helps set the scope of the engineering work.
Working With Metal Engineers LLC
Metal Engineers LLC provides structural engineering for steel buildings and self storage, with multi-story self storage as its lead service. The firm's licensed structural engineers each bring 12 to 27 years of experience. Based in Georgia, Metal Engineers LLC is registered in 34 states, including Georgia, Florida, Texas, and North Carolina.
Metal Engineers LLC designs the structure. Construction is handled by the developer's chosen contractor. To start a conversation about a project, contact Metal Engineers LLC or see recent projects.
Frequently Asked Questions
What does a structural engineer do for a self storage building?
The structural engineer designs the frame, floors, lateral bracing, and foundations, and produces the stamped structural drawings and calculations needed for a building permit. On multi-story projects, that includes the elevated floors, elevator and stair openings, and the added wind and foundation loads.
Do I need a structural engineer licensed in my state?
Building departments generally require structural drawings stamped by an engineer licensed in the state where the building is located. Metal Engineers LLC is registered in 34 states; contact the firm to confirm a specific location.
What are structural calculations?
Structural calculations are the engineer's documented analysis showing that each part of the structure can carry its loads. They accompany the structural drawings in the permit submittal.
Can a structural engineer work with a pre-engineered metal building supplier?
Yes. On many self storage projects, the structural engineer coordinates with the building manufacturer and handles the parts of the structure outside the manufacturer's package, such as foundations and elevated floors.
When should I hire a structural engineer for a self storage project?
At the concept or site planning stage, before the layout is locked. Early structural input on height, column grid, and framing system has the biggest effect on cost.
Does Metal Engineers LLC build self storage facilities?
No. Metal Engineers LLC provides the structural engineering. The building is constructed by the developer's contractor.